HomeMy WebLinkAboutResolution 2015-153 N.C.S. 09/21/2015Resolution No. 2015-153 N.C.S.
of the City of Petaluma, California
APPROVING THE
2015 FLOODPLAIN MANAGEMENT PLAN UPDATE
WHEREAS, the City's Floodplain Management Plan (PLAN) is a part of the
Community Rating System (CRS) of the Federal Emergency Management Agency, which offers
flood insurance premium rate reductions to communities that participate in the National Flood
Insurance Program; and
WHEREAS, this PLAN is required to be updated at least every five years to meet higher
CRS Standards and maintain the City's involvement in the program; and
WHEREAS, on October 4, 2010, the City Council held a noticed public meeting on the
proposed PLAN; and
WHEREAS, the City Council has reviewed the 2015 Floodplain Management Plan
Update, and finds that:
The PLAN accurately describes the nature and magnitude of flooding the City has
experienced in the past; floodplain management activities that have been implemented to date;
and a plan for future action to address the current flooding problems and reduce losses of life and
property.
NOW, THEREFORE, BE IT RESOLVED that the City Council of the City of
Petaluma does hereby adopt the City of Petaluma 2015 Floodplain Management Plan Update,
attached as Exhibit A to Resolution and incorporated herein by reference.
Under the power and authority conferred upon this Council by the Charter of said City.
REFERENCE: I hereby certify the foregoing Resolution was introduced and adopted by the Approved?no
Council of the City of Petaluma at a Regular meeting on the 2151 day of September, form. i
2015, by the following vote:
City Attorney
AYES: Barrett, Mayor Glass, Healy, Kearney, King, Vice Mayor Miller 1
NOES: None
ABSENT: Albertson
ABSTAIN: None
ATTEST:
City Clerk -Mayor
Resolution No. 2015-153 N.C.S. Page 1
Exhibit A to Resolution
City of Petaluma
Floodplain Management Plan
October 201.5
11 English Street
Petaluma, CA 94952
707-778-4303
Fax 707-776-3602
Email: publicworks@ci.petaluma.ca.us
Resolution No. 2015-153 N.C.S.
Page 2
CITY OF PETALUMA
FLOODPLAIN MANAGEMENT PLAN
Table of Contents
Section1 - Introduction............................................................................................................ l
1.1 Preparation of the Floodplain Management Plan..........................................................1
1.2 The IMP Document....................................................................................................3
Section 2 - Flood Hazard Assessment.......................................................................................4
2.1 Community Background..............................................................................................4
2.2 History of Flooding.....................................................................................................5
2.3 Designated Floodplains and Flood Data.......................................................................9
2.4 Petaluma Benefit Assessment Zone 2A......................................................................13
2.5 Petaluma Watershed Master Drainage Plan................................................................13
2.6 Phase II NPDES Storm Water Management...............................................................14
2.7 Seismic and Geologic Hazards...................................................................................14
Section3 - Assess the Problem...............................................................................................16
3.1 Impact of Potential Flooding on the Community........................................................16
3.2 Flood Warning Procedures.........................................................................................20
3.3 Critical Facilities in the Floodplain............................................................................24
3.4 Natural and Beneficial Areas.....................................................................................25
3.5 Development and Redevelopment in the Floodplain..................................................26
3.6 Impact of Flooding on Community Economy and Tax Base.......................................27
Section 4 - Floodplain Management Goals.............................................................................29
Section 5 - Review of Floodplain Management Activities...................................................... 33
5.1 Preventive Activities..................................................................................................33
5.2 Property Protection Activities.................................................................................... 35
5.3 Natural Resource Protection Activities...................................................................... 36
5.4 Emergency Services Measures.................................................................................. 37
5.5 Structural Projects..................................................................................................... 37
5.6 Public Information Activities.....................................................................................38
Section 6 - Floodplain Management Action Plan........
6.1 Preventative Activities ...................................
6.2 Property Protection Activities ........................
......................................................... 41
......................................................... 41
......................................................... 42
City of Petaluma Floodplain Management Plan -ii- September 21, 2015
Resolution No. 2015-153 N.C.S.
Page 3
CITY OF PETALUMA
FLOODPLAIN MANAGEMENT PLAN
Table of Contents
6.3 Natural Resource Protection Activities......................................................................43
6.4 Emergency Services Measures..................................................................................44
Section 6 - Floodplain Management Action Plan (continued)
6.5 Structural Projects.....................................................................................................45
6.6 Public Information Activities..........................:.......................................................... 46
Section 7 - Implementation and Evaluation............................................................................48
APPENDIX..........................................................................................................................49
LIST OF TABLES
Table 1 Repetitive Loss Properties, City of Petaluma...........................................................18
Table 2 City of Petaluma Flood Monitoring Gages................................................................ 21
LIST OF FIGURES
Figure 1 City of Petaluma Location Map................................................................................. 6
Figure 2 City of Petaluma 100 Year Floodplain.....................................................................12
Figure 3 City of Petaluma Repetitive Loss Areas...................................................................19
Figure 4 City of Petaluma Monitoring Stations......................................................................23
City ofPetahmna Roodplain Management Plan -itt- September 21, 2015
Resolution No. 2015-153 N.C.S. Page 4
CITY OF PETALUMA
2015 FLOODPLAIN MANAGEMENT PLAN
Plan Introduction
The Federal Emergency Management Agency (FEMA) fust issued Flood Insurance Rate
Maps in 1980. Since that time, the City of Petaluma has made a concerted effort to
manage the development of its floodplain by the adoption of various ordinances,
regulations and practices, and by incorporating floodplain management goals into the
City's General Plan 2025, adopted in May of 2008. The City of Petaluma joined the
National Flood Insurance Program (NFIP) in 1983 and adopted its first Floodplain
Management Plan (IMP) in 1995. The City updated and re -adopted its plan in October of
2001 and October of 2010.
The City of Petaluma participates in
efforts to reduce potential losses du(
by the NFIP, encourages communit.
planning activities. Under this progr
reflective of their efforts in undert
reduced flood insurance premiums to
the Community Rating System (CRS) as one of its
to flooding for its citizens. This program, created
es to become proactive in their flood management
im, participating communities receive a point rating
eking these activities. The CRS ratings result in
floodplain residents and property owners.
The NFIP has conducted annual audits of the City's floodplain management efforts for
over two decades and has awarded the City, a Class 6 rating, thus reducing flood
insurance premiums throughout the City by 20 percent. According to FEMA, as of June
30, 2015, there were approximately 393 flood insurance policies currently in effect, with
an annual premium of over $418,774. It is estimated that the City's participation in the
CRS program saves insured residents $83,755 per year.
1.1 Preparation of the Floodplain Management Plan (FMP) 2015 Update
To prepare this updated FMP, the City of Petaluma organized a technical advisory
committee (TAQ of staff members from various departments as well as outside agencies
and committees. The TAC:inembers are:
Curtis M. Bates, P.E., City Engineer, City of Petaluma
Scott Duiven, Senior Planner, City of Petaluma
Leonard Thompson, Fire Chief, City of Petaluma
Erica Ahmann Smithies, Senior Civil Engineer P.E., City of Petaluma
Trae Cooper, GIS Manager, City of Petaluma
Philip Wadsworth, P.E., Sonoma County Water Agency
John FitzGerald, P.E., P.L.S., Zone 2A Flood Advisory Committee
City ofPetahnna Floodplain Managentent Plan
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 5
The TAC met multiple times over the course of this update to participate in the
Floodplain Management Plan update process. The meetings focused on the following
plan elements:
• Assessing the Hazard
• Assessing the Problem
• Setting Goals
• Reviewing Possible Activities
• Drafting an Action Plan
The Floodplain Management Plan update pr(
ways. A questionnaire was developed solici
control practices and how they may impact
opinion on how flood activities should be pri
696 properties located in the special flood haz
87 completed questionnaires which is a 13% re
A public meeting was held to involve the p
was held at Petaluma Community Center,
area, on August 19, 2015. At this meeting, tl
regarding the status of flooding in the Pet
management plan process and the CRS pro;
non-structural floodplain management acti`
question/answer session was held after tl
additional comments that could be mailed or
the public meeting.
City staff also coordinat
Management Plan updal
planning process and/or
review and comment:
U.S. Army Corps of Engineers
333 Market Street, 7th Floor
San Francisco, CA 94105
Sonoma County Permit
and Resource Management Dept.
2550 Ventura Avenue
Santa Rosa, CA 95403-2829
City of Petah nta Roodplain Management Plan
s also involved the public in several
the general public's views on flood
ividual homeowners, as well as their
.zed. The questionnaire was mailed to
area. The City received, approximately
lie in the ,planning process. The meeting
ich is located in the special flood hazard
attendees were presented with information
ima area, a description of the floodplain
im, and a discussion of the structural and
es the City is presently undertaking. A
formal presentation. Paper forms for
rued in to City staff were also available at
following agencies in the course of the Floodplain
These agencies were invited to participate in the
led with copies of the Draft FMP report for their
California State Dept. of Fish & Game
P.O. Box 47
Yountville, CA 94599
CA Regional Water Quality Control Board
San Francisco Bay Region
1515 Clay Street, Suite 1400
Oakland, CA 94612
2
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 6
1.2 The FMP Document
This document presents an updated FMP for the City of Petaluma. The purpose of this
updated FMP is to ensure that an open public process is followed in pursuing the
reduction of flood losses, and that the selected activities are best for the community. This
plan describes the nature and magnitude of flooding the City has experienced in the past;
floodplain management activities implemented to date; additional alternative remedies;
and a plan for future action to address the current flooding problems. It is not the purpose
or the intent of this plan to commit the City to large
to quantify the problem and propose solutions that
the future, if and when funds become available.
The FMP is intended to be a living do
changes in City policy and state and/or
City of Petaluma Floodplain Management Plan
s. The objective is
at this time, and in
be subiect to revisions to reflect
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 7
2. Flood Hazard Assessment
2.1 Community Background
Incorporated in 1858, the City of Petaluma is situated in southern Sonoma County, in
northern California, northwest of San Pablo Bay (Figure 1). San Francisco is 35 miles to
the southeast. Petaluma occupies an area of 13.6 square miles along U.S. Highway 101
(City of Petaluma GIS Data, 2015). According to the 2015 census, the current population
of Petaluma is 59,322.
The Petaluma Valley is a relatively flat alluvial
coalescing alluvial fans derived from the erosio
highlands. This alluvium is comprised of clays,
minor layers of sand and pebble gravels. The ele-
Geodetic Vertical Datum of 1929) at the Pet,
surrounding hills. The valley enjoys a Mediterxai
long, dry summers and cool, wet winters. Temper
summer and seldom drop below 22 degrees Fahren
precipitation over the basin is estimated at 26 inc
Jim Goodridge).
Development in the urban
small businesses, schools, s
growth has resulted in encro
area. A typical waterway
sections, with bridges and c
have been built along the
19891.
Petaluma is now in the
undertaken ;in partnership`
been marked with delays
under construction and s
Control Project will be oul
effectively eliminate the rE
provide 100 -year flood pr(
plain developed by overlapping and
of volcanic rocks in the bordering
silts, and floodplain sediments, with
ation ranges from sea level (National
.uma River to over 400 ft. in the
oan type of climate, characterized by
tures remain moderate throughout the
reit in the winter. The average annual
ies (City's Consulting Meteorologist,
of residential subdivisions, office complexes,
rs parks and open space. Through the years,
many segments of the waterways in the urban
ugh q combination of natural and improved
d at frequent intervals. Buildings and homes
limiting the flood -carrying capacity (FEMA,
stages of a multi-million dollar Flood Control Project
the Army Corps of Engineers. Although the project has
.ending and cost increases, the final stages are currently
aled for completion in November of 2015. The Flood
in more detail later in this report. Once completed, it will
ive loss zone within the Payran reach of the City, and will
Dn to this neighborhood.
In May of 2008, the City Council adopted a new General Plan. The General Plan contains
several policies aimed at improving floodplain management within the City of Petaluma
and its watershed. These policies will be described in more detail throughout this FMP.
General Plan chapters 4, "the Natural Environment", and 8, "Water Resources" have
been included in the IMP appendix A and B.
City of Petahana Floodplain Management Plan
4
Resolution No. 2015-153 N.C.S.
September 21, 2015
Page 8
2.2 History of Flooding
In the mid -1800's storm water runoff from the Petaluma watershed, which drained to the
Petaluma River and its tributaries, often overtopped the existing channels and spread
across the valley until it could return to the waterways and complete its flow to San Pablo
Bay. In the ensuing century, with settlement of the town of Petaluma and the
surrounding areas, and the urbanization of the region since the 1950's, such overflow
could no longer be tolerated. Measures were implemented to improve drainage and
control the flooding -- flood control projects were constructed, standards were adopted
for private development, and floodplain zoning was instituted. All of these helped to
solve many of the problems but, as was most dramatically evident during the storms of
January 1982, February 1986 and most recently December 2005, many problems still
existed. The most serious of these is the flooding that occurs along the Petaluma River
itself. This waterway, which once meandered across the valley, now flows through the
most heavily urbanized area of the City of Petaluma and causes significant damage and
disruption when storm runoff from its tributary area exceeds its capacity.
The largest flood of record in tl
3-5, 1982, and caused an es
documented in an Army Corps
read:
"During the
of the rive]
water depth reached two to
City of Petaluma Floodplain Management Plan
of Petalumaoccurred during the period of January
28 million' dollars in damages. The flood is
ineers post -flood report. An excerpt of this report
flooding occurred over a 50+ block area on both sides
of Petaluma. Most of the 500 homes and the 100
lents in this area incurredflood damage. In many cases,
e feet inside the structure. The most severely hit area
where most homes had four to five feet inside. Payran
daniage.in which flooding reached over three feet inside
G
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 9
Figure 1
Figure 1
REGIONAL LOCATION
Floodplain Management Plan 2015
............ Watershed Area
Urban Areas
n
Gity of Petaluma
11 nglish Street
Polaluma, CA 94952
generalplarifti.petaluma.ca.us
Cit}, ofPetahtnra Floodplain hlanagementPlan
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 10
Approximately one million dollars in flood damages occurred in the urbanized reach of
the Petaluma River between the Lynch Creels confluence and the Lakeville Street Bridge
during the flood of February 14-17, 1986. On February 15, an article in the San
Francisco Chronicle was headlined "Petaluma Takes to the Boats":
"Yesterday, most of the townsfolk put their experience to use and took their lumps like
troupers. The relatively few newcomers in the hardest-hit Linda Del Mar subdivision,
where the water depth in the street reached five feet, "absolutely panicked, " according to
a veteran of the 1982 deluge. "
At 4 a. in., a flood alert was posted for the city of 40,000 people. By drnvn, a team of
police officers, firefighters and vohnrteers was knocking on doors in Petaltm7a's flood
prone flatlands.
About 400 homes were evacuated in the Linda Del Mar subdivision and several trailer
parks tivest and east of U.S.101. Those who could not drive over the flooded roads tivere
removed by bits and, later, by boat.
On March 9, 1995, Petaluma once
resulted in approximately nine th(
Treatment plant when fencing and
was additional damage to Hopper
and monitoring. c
evacuated, althougl
Francisco Chronicle
"This same ar
Yesterday was
24 hours endh
Street Bridge,
emergency wo,
Rocca Drive. "
"Another 134
in
"Soggy Anger
)erienced significant flooding. This flooding
llars of damage to the Petaluma Wastewater
iund an aerated lagoon were damaged. There
well as increased need for electricity usage
na were closed, and a total of 327 homes
On March 10, 1995 an article in the San
the Street That Always Floods" reads:
ea (Payran Street) has flooded over and over since the big flood of 1982.
no exception tivith about 3.5 inches of rain pounding Petaluma during the
tg at noon. By 7:30 a in., the raging waters were overflowing the Payran
sweeping over, yards, into some garages and basements and forcing
kers to order• the evacuation of 193 homes of Payran, Jess Avenue and
Willow Creek was
5 p. in. the waters
homes.
evacuated at the Leisure Lake Mobile Home Park where
to overflotiw its banks and turn the park into an island. By
pink, and most residents were allowed to return to their
In the winter of 1997-1998 the effects of El Nino storms were felt throughout California
and the rest of the country. Some large storms hit the West Coast in the first three weeks
of February 1998, and these caused flooding in Petaluma as well as in many other parts
of the state. The cost of damages in Petaluma was nearly six million dollars. Most of the
damage occurred during the flooding on February 2-3, 1998, with some recurring damage
from another storm on February 29, 1998. State and Federal governments declared the
winter storms and flooding a disaster, and FEMA designated the event as "FEMA — 1203
— DR". The greatest damage was to the homes in the Payran area and businesses in the
City of Petaluma Floodplain Management Plan / September 21, 2015
Resolution No. 2015-153 N.C.S. Page 11
Industrial Avenue/Auto Center Drive area. The oxidation ponds at the City of Petaluma's
wastewater treatment facility were damaged once again. Considerable silt buildup in the
Turning Basin required dredging, and many roads in the City suffered damages. On
February 20, 1998 in an article titled "More Rain, More Havoc" the San Francisco
Chronicle reported:
A flash flood caused the Petaluma River tojump its banks and spill into the streets and
homes of the hard-hit Payran area of Petaluma. It ivas the third time in three weeks that
the lois,-lying community has been flooded. Nearly 50 homes, were evacuated and cars
parked by the river were nearly submerged. Petaluma firefighters used an inflatable boat
to rescue a few stragglers. Others waded out of the neighborhood through streets that
had as much as three feet of water.
"Meanwhile, nearly 30 seniors were evacu
north of Petaluma when Stony Point Road
community. "
On December 31, 2005, the City experier
middle and northern areas of town. It is est
including mobile home parks, were damage
$56,000,000. There was also damage to loca
the flooding. The greatest damage from t
Factory Outlets, commercial structures and
Payran reach was not adversely affected by
majority of the Petaluma River Flood Conti
was declared a State and Federal disaster.
On December 29,
in review article
"The New Yea's Ei
since 1997 - caused
property owners mo
including the auto it
feet of muddy water
City of Petaluma Floodplain Management Plan
crat
the Leisure Lake mobile home park
cutting off automobile access to the
ed .significant flooding, particularly in the
nated that approximately 53 structures, not
by flood waters at an approximate cost of
streets and river channel banks as a result of
is event was located within the Petaluma
hree of the City's mobile home parks. The
.his flood, _which is ;mainly attributable to a
1 Project being in place. The flooding event
the following excerpt from a year
the biggest nests story of the year. The flooding - the most severe
in damage, most of it in north Petahana. In some cases, it took
ger. Hardest hit tivere businesses ner the Petaluma River,
undreds of cars were damaged, and the outlet mall, where 1 to 2
marry shops. "
8
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 12
(Aerial view of Factory Outlet Mall flooding 121
Most recently, on December 11, 2014, 1
within the northern and southern porti(
along the Petaluma River which floode(
flood waters lead to road closures in the
between Old Redwood Highway and C,
areas occurred. Additional street floodin
East :Court and Caulfield Lane. Casa G1
near Corona Creek
flooded or damaged
he City again experienced flooding particularly
ns of the City. Floodwaters overtopped banks
I Industrial Avenue and surrounding areas. The
Industrial Avenue and Auto Center Drive areas
trona Road. Evacuations of businesses in these
g occurred in the Lakeville Street area between
ande Road near Adobe Creels, residential areas
hway near Ellis Creek. There were no reports of
of this flood event.
2.3 Desianated Floodulains and Flood Data
Approximately 1612 acres of the City of Petaluma lie within the FEMA designated 100 -
year Special Flood Hazard Area (SFHA), shown in Figure 2. In addition, 112 acres of
this area are a designatedfloodway.
In December of 2008, under the map modernization act, FEMA issued updated flood
insurance rate maps known as D -FIRMS. The D -FIRMS are very similar to the 1989
FIRM's for Petaluma and are essentially an electronic version of the 1989 FIRM data.
The D -FIRMS also included new information that the 1989 maps did not include such as
aerial photography. The data was helpful in better determining floodplain locations. The
D -FIRMS did not include revised floodplain boundaries based on post 1989 development
and structural flood control projects. On February 19, 2014, Petaluma's flood insurance
Cary of Petalrnna Floodplain Management Plan
9
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 13
rate maps were once again updated by FEMA and the City. As part of this process, the
City developed a flood surface model of the Petaluma River basin using XPSWMM
storm water modeling software. This modeling was used by FEMA to prepare the
updated FIRM maps. The process included several iterations of modeling runs using the
latest, best available topography, rainfall data and other technical information to produce
the new FIRMS. Subsequently, the City submitted an application to FEMA requesting an
A99 flood zone designation for the Payran residential neighborhood. A99 flood zones are
designated in areas which an overwhelming majority of a flood control project is
complete, with the remaining sections scheduled to be complete with the near future. The
remaining segments of the Petaluma River flood control project are currently under
construction and are scheduled to be complete in November 2015, at which point, the
project will be certified by the United States Army Corpsof Engineers and there will no
longer be a need for an A99 flood zone determination in this area. Upon certification of
the project, the City will be submitting an application to FEMA to re -designate the A99
Payran area flood zone to a flood zone "X".
FEMA has also been studying the effects
elevations within the San Francisco Bay and
insurance studies for the "Bay Coastal Stud3
become effective on October 20, 2015. The r,
maps show that there is very little impact v
Flood surface elevations it
Downtown Petaluma, incre
Datum (NAVD) for the one
existing river banks althou
added to the special flood h;
weather pat
{EMA flood
flood hazard studies.
come with higher
"Atmospheric River
the
from 9.0
,nt storm
ire are a
area. The
ave surge on flood surface
Draft FIRM mans and flood
have been prepared and are scheduled to
ilts of the study and corresponding FIRM
iin Petaluma as a result of this analysis.
uma City limits, including a portion of
to 10.0 feet, National Vertical Geodetic
This increase is largely contained within
locations in which properties have been
has notified these property owners of this
he affected areas.
Pied the need to start studying climate change and the
I special flood hazard areas with future flood studies.
;e rate mapping uses only existing data in preparation of
1 projected weather patterns suggest that rain storms will
rainfall amounts. These storms have been termed
In addition to the FEMA FIRM maps, the City of Petaluma created and adopted "Figure
8. 1, 100 -year Flood Boundary General Plan 2005 build out." The exhibit with its defined
boundary was created to identify limits of the New Year's Eve 2005 flood event and
develop policies within the General Plan 2025 that require new development to comply
with higher regulatory standards than those defined by FEMA. The limits of this
floodplain boundary were determined by a post flood aerial and ground high water
marlddebris line survey.
00, ofPetahnna Floodplain Management Plan
10
Resolution No. 2015-153 N.C.S.
September 21, 2015
Page 14
Historically, there are two main areas of significant flooding along the Petaluma River.
The first area, lying between Denman Flat and the confluence of the Petaluma River with
Lynch Creek, consists mainly of commercial, industrial, retail and undeveloped
properties. The second area, located between the Lynch Creek/Petaluma River
confluence and the Lakeville Street Bridge, consists mainly of residential properties
developed during the 1960's. This residential area is referred to as the Payran reach
Floodplain. Significant flooding once occurred in the urbanized "Payran Reach" between
the Lynch Creels confluence and the Lakeville Street Bridge. However, since the
Petaluma River Flood Control Project has been constructed,,, including the New Year's
Eve 2005 and December 11, 2014 flood events, the Payran Area has not flooded.
The entire special flood hazard area within the City has been mapped as AE areas, with
determined base flood elevations. Characteristic floods in the Petaluma River Basin are
normally of short duration, lasting a few hours to one or two days. Floods on the
Petaluma River may develop within hours after the beginning of a flood -producing storm
and begin to recede within hours of the end of the storm. Although floods have been
recorded as early as November and as late as April, most occur between December and
February after prolonged rainy periods, which fully saturate the soil, increasing runoff
volume. Flooding can occur along the entire length of the River.
The natural storage area of Denman` Flat in the northwestern part of the City, where
Willow Brook, Liberty, Marin and Wiggins Creeks come together to form the Petaluma
River, acts as a detention basin and helps to reduce downstream peak discharges.
Significant flooding occurs in this natural storage area and to the area east of Denman flat
between Highway101, and the Northwestern Pacific railroad line when excess flows in
the Willow Brook channel escape as sheet flow to the southwest. Flooding from the
Petaluma River can occur in the reach between Denman Flat and the confluence with
Lynch Creek, and is generally, shallow. Flooding is reduced in depth downstream of
Lakeville Street and is fairly well contained in the Petaluma River channel below the "D"
City of Petahuna Moodplain Management Plan 11 September 21, 2015
Resolution No. 2015-153 N.C.S. Page 15
City of Petaluma Floodplain Management Plan
Figure 2
s 3 4
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12
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 16
E
\�
a
m
o
f
j`
City of Petaluma Floodplain Management Plan
Figure 2
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12
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 16
2.4 Petaluma Benefit Assessment Zone 2A
In 1959, the Petaluma Benefit Assessment Zone 2A was created as a joint flood control
endeavor between the City of Petaluma and Sonoma County Water Agency. This zone
encompasses 87 square miles bounded by San Antonio Creek on the south; Browns Lane
and Stage Gulch Road on the southeast; Railroad Avenue, Roberts Road, and Lichau
Road on the North; and Laguna Road, Lake Street and Two Rock Road on the west. In
general, the zone includes all tributary drainage reaching the Petaluma River north of the
mouth of San Antonio Creek. Residents within this Zone, pay an extra tax to fund
structural projects that will reduce flooding risks in this area. There is a seven -member
Zone 2A Advisory Committee consisting of citizens who reside within the Zone and
representatives from the City of Petaluma and Sonoma County. This committee is
responsible for recommending budget priorities to the Board of Directors of the SCWA
for inclusion in the Zone budget for each fiscal year.
2.5 Petaluma Watershed Master
As a result of the major flooding that occurs
requested, and the Flood Control Zone 2A )
Sonoma County Water Agency prepare a Di
Watershed. The plan was completed in Ma
Drainage Plan as policy ,under Program 7 of
of the City's former General Plan (1987-2005
Program 7 - Adopt the
Sonoma Countv Water
982 and 1983, the City of Petaluma
y Committee recommended, that the
Master Plan for the Petaluma River
1986. Petaluma adopted the Master
mmunity Health and Safety Element
sensitive, and effective proposal(s) of the
Irainage Plan in order to mitigate the 100 -
The Master Drainage Plan is used, by the Sonoma County Water Agency and the City of
Petaluma in their capital improvement planning and construction, and in review and
approval of land developments. It provides a valuable tool for consulting engineers by
alerting them to the approximate scope of the drainage improvements needed for land
development. The Master Plan is used by the Flood Control Zone 2A Advisory
Committee to select projects for construction using SCWA funds. On a daily basis, the
Master Drainage Plan is used by the SCWA and the City for resource information to
respond to questions from the public. The Master Plan has three basic elements.
1. The watershed is described as to size, location, land use and other significant
information.
2. The flooding and drainage problems of the watershed are described.
3. Structural solutions are described; including anticipated changed conditions or
environmental effects.
City ofPetahana Floodplain Management Plan
13
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 17
The report includes maps to identify the area studied and also the flood hazard and
drainage problem areas; as well as drawings to show the location, size and type of
drainage improvements, which, if constructed, would alleviate or eliminate the problem.
The Sonoma County Water Agency updated the Petaluma River Watershed Master
Drainage Plan in June of 2003. The City of Petaluma continues to work with the Sonoma
County Water Agency and Zone 2A committee on implementing various projects
identified in the master plan. Policy 8-9-29 of the City's General Plan 2025
acknowledges the updated master plan and contains policies and programs to work with
Sonoma County Water Agency and County of Sonoma staff to implement projects from
the 2003 master plan. A copy of the Petaluma River Watershed Master Drainage Plan is
available for public review at the City of Petaluma.
2.6 Phase II NPDES Storm Water
In November of 2003, the City of Petaluma'
(SWMP) per the mandated requirements of
identifies the following six minimum control
improve storm water quality:
• Public Education and
• Public Participation a
• Illicit Discharae'Dete
• uons
• Post-
• Pnllu
water ordinan
SWMP requ �
application w
Control Boar(
and treatment
2.7 Seismic and
ite
and 1
ater:
Tater
Plan
a Storm Water Management Plan
;ral Clean Water Act. The plan
s that the City must undertake to
ntifies programs and projects aimed at minimizing accelerated erosion
of sediment laden runoff from entering the Petaluma River. A new storm
(Chapter 15.80 of the City's Municipal Code) was adopted as part of the
rents in June of 2005.' In 2013, the City of Petaluma filed an updated
the State Water Resources Control Board and Regional Water Quality
fhe new permit requires the City implement various storm water quality
tivities including increased regulations on smaller construction projects.
Two active faults affect the Petaluma area: the San Andreas Fault and the Healdsburg-
Rodgers Creels Fault. Based on a fault evaluation report conducted by the California
Division of Mines and Geology, the Tolay Fault zone was removed from the special
studies zone designation. Subsequently, the City removed the Hazard Management Zone
for the Tolay Fault. Nevertheless, the City's Building Division staff maintains that site -
City of Petahnna Floodplain Management Plan
14
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 18
specific geotechnical field studies should be required for proposed developments on or in
the immediate vicinity of the Tolay Fault.
City ofPetahima Floodplain Management Plan 15
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 19
3. Assess the Problem
3.1 Impact of Potential Flooding on the Community
Over the past 30 years, the City of Petaluma has experienced significant, documented
flooding events. Evacuations and/or property damages have occurred on an average of
once every five years. The Payran area, which historically received the brunt of Petaluma
River overflow during flood events, is a fairly densely populated residential area. In their
previous responses to the questionnaire that was sent to all residents and property owners
in the City's Special Flood Hazard Area as part of the IMP update process, and at the
public meetings that were held to obtain public input on the FMP, residents expressed
both anger and frustration at the continued losses and disruptions caused by flood events.
Residents also expressed frustration at the time it has taken for the Petaluma River Flood
Control project to be completed and for FEMA to review and issue new flood insurance
rate maps. Now that the Petaluma River Flood Control project is nearly complete, and the
Payran Area has been removed from the special flood hazard area, the City has noticed a
significant reduction in flooding related concerns in this area.
on the
(GIS) data analysis conducted in
City of Petaluma's special flood b
iic Information System
1,000 properties in the
Impacts on Buildings/Infiastructure/Public'`Health and Safety The following
information was obtained from various City staff at a Technical Advisory Committee
meeting for the IMP update:
• During the December 11, 2014 flood event, several commercial, industrial and
Auto Dealership buildings were inaccessible because of flooded roadways
surrounding the Industrial Avenue area. Evacuations were conducted by the
City's Fire Department and Public Works and Utilities personnel.
• Upgrades to the City's sewer pump stations have been necessary due to
floodwater inundation of these facilities;
• Extreme damage... to additional roadways resulted from nearly every major
flooding event in the past twenty years;
• To the best of the TAC members' knowledge, no public bridge crossings or water
mains have been damaged in recent flood events;
• Flood events have caused tremendous siltation problems in the Turning Basin;
City ofPetahnna Floodplain Management Plan
16
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 20
• Every flooding event created public safety issues, primarily involving the closure
of transportation corridors;
• Power (gas and electricity) had to be shut off during all major flood events;
• There were recollections that both sewer manholes and storm drain manholes
have floated off in past flood events;
• City emergency vehicles have sustained damage from negotiating through flood
waters to warn and/or evacuate residents;
• Storm water pipes filled at Adobe Creek and Casa Grande Road causing flood
waters to be diverted to the overflow channel, which then became the main creels
channel, resulting in scour and erosion of the retaining structure and flood flows
along Casa Grande Road.
Repetitive Losses in the Floodplain
claims as of December 31, 2014, a.tc
properties (i.e. the property owners ha
least twice in a 10 -year period since 19
shown in Figure 3. However, a major
which are primarily located in the Pay
the past 10 years. This is largely du(
project. The City 4of Petaluma will be
Services Office, Inc. to request that the
repetitive loss property list.
City ofPetalunm Floodplain Management Plan
sed on the NFIP's records for flood damage
of 34 properties are listed as repetitive loss
iled flood damage claims exceeding $1,000 at
The general locations of these properties are
of the 34 existing repetitive loss properties,
Area neighborhood, have not filed a claim in
the Petaluma River structural flood control
rking 'closely with FEMA and the Insurance
perties in question be removed from the City's
17
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 21
Table 1. Repetitive Loss Properties, City of Petaluma
Property Address
Claims Filed In Years
1327 Clegg St
2005, 2008
56 Cordelia Dr
1982, 1986, 1998
44 Cordelia Dr
1982, 1986, 1998
109 East Ct
1982, 1983, 1986
111 East Ct
1980, 1982, 1983, 1986
100 East Ct
1982, 1983,1986
1150 Industrial Ave
1998,; 2005, 2008
1160 Industrial Ave
1998,2005,2008'
4 Jess Ave
1983, 1986
8 Jess Ave
1983, 1986
9 Jess Ave
1983, 1986, 1998
12 Jess Ave
1983, 1986
16 Jess Ave
1982,` 1986, 1998
17 Jess Ave
1982, 1986, 1998
28 Jess Ave
1982, 1986, 1998
32 Jess Ave
1983, 1986
36 Jess Ave'
1983, 1986, 1998
44 Jess Ave`
1983, 1986
48 Jess Ave
1982, 1983, 1986, 1995, 1998
50 Jess Ave
1983, 1986, 1998
78 Jess Ave `
1982, 1986, 1998
519 Lakeville St
1983, 1986
1238 Magnolia Ave
1982, 1983
3624 Petaluma Blvd N
1999, 2000
3700 Petaluma Blvd N
1986, 1995, 1996, 1997, 1998
811 Petaluma Blvd S
1982, 1983
3 Rocca Dr
1982,1986, 1998
27 Rocca Dr
1982, 1986, 1998
35 Rocca Dr
1982, 1986, 1998
43 Rocca Dr
1983, 1986, 1998
47 Rocca Dr
1982, 1986, 1995, 1998
49 Rocca Dr
1983, 1986, 1998
115 W. Payran St
1982, 1986
20 Woodworth Way
1982, 1986
000 of Petahnna Floodplain Wanagemew PTmz 18
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 22
Figure 3
City of Petaluma Floodplain Management Plan 19
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 23
3.2 Flood Warning Procedures
The City of Petaluma has installed and maintains a computerized Flood Alert System to
enhance its ability to provide timely emergency flood response and evacuation warning to
residents in flood prone areas. This system was originally installed approximately 25
years ago after the catastrophic floods of 1982 and has recently been updated. The
system consists of forty one stations which monitor either river levels, rainfall and/or
weather data. The locations of these gauging stations are presented in Figure 4. These
stations are listed in Table 2. The City is in the process of acquiring 9 additional stream
gauges, 8 additional rain gauges as well as updating the City's software system to Flood
Alert 2.0.
The City of Petaluma maintains an Emerge
procedures are initiated during a flood even
time during the 1986 flooding. Data from st
central computer and a central base station a
the Police Department. Data is logged to
monitoring system is to enable personnel to
monitoring station
City's Emergency
by
inclement weather on various areas ofthe City. In gene
per hour continues for more than one hour, emerge
monitoring of river levels. Weather records are kept on
flood related claims.
As water elevation`
The first of these pi
(EOC). Once acti
plans. Key Cityf
installed a'
staff can
City ofPetahuna Floodplain Management Plan
(EOC). Emergency
;re used for the first
is radio relayed to a
:)Derations Center in
omputer. The intent of the
ilative impact, in real time, of
when a rainfall rate of %2 inch
personnel begin continuous
to document flood events and
J on these gauges, various City procedures are activated.
ie activation of the City's Emergency Operations Center
taff begins to execute standard management operation
e been trained in FEMA's Incident Command System
event or incident, follow the principles of the ICS. City
)cam called "long watch" on the Willow Brook Creek
,e , real time stream levels in Willow Brook Creels.
20
Resolution No. 2015-153 N.C.S.
September 21, 2015
Page 24
Table 2. Stream, Rain and Weather Gauge Locations
Gauge
Number
Sensor
Number
Type of Gage
Location
1
2000
Wind
D Street Br.
2
2002
Stream
D Street Br.
3
2003
Rain
D Street Br.
4
2004
Humidity
D Street Br.
5
2005
Temp
D Street Br.
6
2006
Peak Wind
D Street Br.
7
2007
Pressure
D Street Br.
8
2009
Stream
Corona Rd.
9
2010
Rain
Corona Rd.
10
2011
Stream
Payran St.
11
2013
Stream
Old Redwood @ Willow Creel-,
12
2014
Rain
Washington Creek ,
13
2015
Stream
Twin Creek at Washington Creek
14
2016
Rain
Willow Creek
15
2018
Rain
Lichau Creek
16
2020
Rain
Liberty Road
17
2022
Rain
Middle,Two Rock
18
2023
Stream
Stony Point Road
19
2026
Rain
Wilson Street
20
2177
Stream
Penngrove
21
2179
Stream
Rainsville
22
2180
Rain
Leghorn Park
23
2181
Stream
Leghorn Park
24
2182 . -
Rain
La Cresta Tanks
25
2183
Stream
Shollenberger Park
26
2184
Rain
Shollenberger Park
27
2185
Stream
Kelly Creek
28
2186
Rain
Kelly Creel-,
29
2187
Stream
Twin Bridges
30
2188
Rain
Twin Bridges
00, ofPetalmna Floodplain A2anagemeni Plan 21
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 25
31
2189
Stream
Lynch Creek
32
2190
Rain
Lynch Creek @ North McDowell
33
2191
Stream
Washington Creek @ North McDowell
34
2192
Rain
Washington Creek @ North McDowell
35
2193
Stream
East Washington Creek @ Garfield
36
2194
Rain
East Washington Creek @ Garfield
37
2195
Stream
Adobe Creek @ Sartori
38
2196
Rain
Adobe Creek @ Sartori
39
2197
Stream
Corona Creek @ Sonoma Mountain Pkwy.
40
2198
Rain
Corona Creek @ Sonoma Mountain Pkwy.
41
2199
Stream
Thompsen Creek @ Sunnyslope Road
Evacuation plans exist with City emergency operatioi
areas within Petaluma. These plans are labeled
topographical areas designated as most at risk for floc
given, field personnel go door-to-door to notify
Additionally, the City uses the NIXIE on-line/e-mai
notify residents of impending flooding threats and era
When stream gauge readings re
Alert System is activated, and
National Oceanic and Atmosph
Ff, for several known flooding
prioritized, with the lowest
Once the evacuation order is
lents that they must leave.
-m_ as well as social media to
ect a pre -determined level, the National Weather Service
flash flood warning is automatically announced to the
•ic Administration (NOAA). These warnings are relayed
[casts. In addition, the Sonoma County EOC releases
it is up to the media to distribute the information at their
City of Petahnna Floodplain Management Plan 22 September 21, 2015
Resolution No. 2015-153 N.C.S.
Page 26
Figure 4
City ofPetaluma Moodplaln Management Plan 23
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 27
3.3 Critical Facilities in the Floodplain
A number of critical facilities exist in the flood hazard areas within the City of Petaluma.
As defined by the CRS Program, critical facilities include:
• Structures or facilities that produce, use, or store highly volatile, flammable,
explosive, toxic and/or water reactive materials;
• Hospitals, nursing homes, and housing likely to contain occupants who may not
be sufficiently mobile to avoid death or injury during a flood;
• Police stations, fire stations, vehicle and equipment storage facilities, and
emergency operations centers that are needed for flood response activities before,
during, and after a flood; and
• Public and private utility facilities that are vital to maintaining or restoring
normal services to flooded areas before, during, and after a flood.
One of the City's three fire stations is located within the flood hazard area. This station
was built prior to the City's participation in the National Flood Insurance Program and
has incurred minor flooding damage in the past. In ,no event has this station been
rendered uninhabitable or inaccessible due to flooding, including the 250 -year event in
1982. The Fire Department has developed contingency parking at the Santa Rosa Junior
College as an alternative staging area .in the event that the station is inundated or
otherwise deemed: unusable.
One school, McKinley Elementary, used to be located within the flood hazard boundary
in the Payran area but has been removed as a result of the Petaluma River Flood Control
Project and new flood insurance rate' maps. During both the 1995 and the 1998 flood
events, this school, along with'many others, was closed. McKinley Elementary school did
not flood during the 2005 New Year's Eve and December 11, 2014 events. The
McKinley Elementary attendance system was modified from K -sixth grades to fourth
through sixth in 2010. A portion of Bernard Eldridge Elementary School was newly
introduced into the special flood hazard area as shown on the new flood insurance rate
maps dated February 19, 2014.;
Leisure Lake Mobile Home Park houses many elderly citizens. During a flood event, this
area has the potential to become an island surrounded by floodwaters which can leave the
area inaccessible to emergency vehicles. The City of Petaluma has organized a procedure
of evacuating this area using buses to aid the residents in transportation to the Evacuation
Care Shelter or to friends and relatives.
Both Petaluma Valley Hospital and Kaiser Medical Clinic are located outside of the
Flood Hazard Area. In 2011, the Petaluma Health Center opened for business at 1179
North McDowell Boulevard. An existing commercial building was retrofitted to
City ofPetahnna Floodplain Management Plan
24
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 28
accommodate the new health center. Work on the building was a substantial
improvement and a commercial flood proofing system was installed. The police station,
where the City's EOC is headquartered, is also located outside of the Flood Hazard Area.
A portion of the City's Community Center property, including the pond, and portions on
the parking lot and ball fields are located within the special flood area. The Community
Center building is not within the flood area. A portion of the City's Public Works and
Utilities Department building at 202 North McDowell Boulevard is located within the
special flood hazard area.
A portion of the City's new wastewater treatment plant property is located inside of the
Flood Hazard Area because of FEMA's decision to remove existing levees for floodplain
mapping purposes unless certified by the ArmyCorps of Engineers. However, the
structures and wastewater treatment systems are elevated above: the special flood hazard
area. Also critical to the continued operation of the treatment facility are three pump
stations located within the floodplain. Both the Wilmington Street, and the Copeland
Street pump stations, have been elevated one foot above the base flood elevation. The C
Street pump station has been flood -proofed with watertight doors and recently underwent
a major update including new pumps and a generator. Additionally, all stations have
emergency generators to insure their continued operation. The City also maintains a
mobile emergency back-up generator at the City's corporation yard facility on Hopper
Street.
3.4 Natural an
and adopted the Petalum,
the Plan was to describe
• maintain the naviLyawilty o
thancement"Plan In May of 1996, the City approved
,cess and Enhancement Plan. The overall purpose of
nunity's vision for the Petaluma River, including its
lopments Nine goals for the Petaluma River corridor
and Enhancement Plan:
Rivet;
• improve nooct control;
• Promote the balanced use of the river corridor;
• Restore, create, and protect natural habitats, and enhance native vegetation along
the river corridor;
• Expand public access to and awareness of the river;
• Assure permanent maintenance and promote public safety along the river;
• Create guidelines to integrate development into the river corridor;
• Preserve the economic viability of property within the river corridor, and;
• Identify sources and strategies for funding and implementing the Petaluma River
Access and Enhancement Plan.
City of Petahima Floodplain Management Plan
25
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 29
These goals, as well as the methods and activities outlined in the Access and
Enhancement plan and have been updated and included in the City's General Plan 2025.
Enhancement Plan for the Petaluma River Marsh An area of approximately 150
acres of the Petaluma River's floodplain lies in a marsh that is regularly flooded by high
tides. The Petaluma River Marsh Enhancement Plan was developed to insure the
preservation of this area in its natural state; including its water quality and endangered
species habitat, as well as malting it accessible to the public for passive recreational and
educational/interpretive opportunities.
Adopted in 1992, the Plan inventories the natural resources of the plan area, identifies
resource management and biological enhancement needs and opportunities, and presents
a number of individual enhancement and restoration design elements, as well as
designating possible public access trails, waterfront access points, and park and
recreational facility areas. Further detailed engineering and planning studies will be
required to define the exact location and design of these features. Permits from State and
Federal agencies, also requiring further studies, will be necessary prior to implementation
of some Plan elements (City of Petaluma, 1991).
Although the majority of the plan area is in public ownership, some private lands are also
included. The private lands each carry General Plan Open Space designations for the
marsh area. Acquisition of these Open Space areas is being pursued through a number of
different means including purchase, California State Lands Commission reclamation or
dedication required at time of private development. In addition, on those marshlands not
acquired by the City, buffer zones along the edge of the Open Space areas have been
created to ensure that development does not encroach on, or negatively affect, the marsh
habitat.
3.5 Development and Redevelopment in the Floodplain
Petaluma was built adjacent to the Petaluma River to tape advantage of the river's natural
transportation route to and :from San Francisco Bay. Development continued in the
westerly direction from the river until the 1950's, when it began to move to the north and
east.
Development Constraints The 2015 census results indicated the City's current
population to be 59,322. At the present time the City's ultimate build out population at
2025 is estimated at 72,707. The Urban Growth Boundary (UGB), which was adopted by
the City in 1998 and originally contained a 20 year lifespan, has severely limited the
amount of new urban residential growth in the areas surrounding the City. The General
Plan 2025 recognized the UGB as being in place until 2025. A ballot measure, known as
Measure T, was passed by Petaluma voters in November 2010, extending the expiration
date of the urban growth boundary to coincide with the timeframe of the City's General
Plan 2025. Other constraints to development, particularly in the floodplain, include the
Floodplain/Floodway regulations contained within the City of Petaluma Zoning
City ofPetahmla Floodplain Management Plan
26
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 30
Ordinance, the Petaluma General Plan, subdivision/infrastructure requirements, and
environmental regulation.
The City of Petaluma originally adopted comprehensive Floodplain/Floodway regulations
in 1973 as part of the 1973 Zoning Ordinance. These regulations have undergone a
number of revisions to keep them current with State of California and National Flood
Insurance Program regulations. The Floodplain Ordinance was most recently updated in
1999.
Wetland and habitat preservation also restrict dev
inventory of sites within the City that have been
along with a photo interpretation of potential wetla
cumulative impact analysis for expanding wastew
projects. All future development within the areas
with all local, State, and Federal regulations govern
The Petaluma General Plan 2025 was
2008. The previous General Plan, (GP
which is to "enhance the Petaluma Ri
(City of Petaluma, 1987). The City'
previous plan and contains several ne
reducing flooding and protecting live:
implementing higher regulato
and beneficial areas, using i
increased flood and 'surface
structural and non-structural ii
The City of Petaluma rem
the existing General Plan,
more recent studies, as we
the past.
-lopment within the Floodplain. An
surveyed for wetland characteristics
d sites has been compiled as part of a
Iter facilities and flood improvement
identified will be required to comply
na wetlands and habitat.
adopted by, the
1987-2005) stat(
ver as a resourc
new. General I
N programs and
and property fr,
)pment standard
technoloi2v to
etaluma City Council in May of
a number of major goals, one of
to be preserved, seen and used"
an, significantly builds upon the
)olicies that are aimed at further
n flooding. The plan focuses on
restoring and enhancing natural
-tter define flood hazard areas,.
coordination with other agencies and implementing
ements. These are listed in the General Plan's Water
Elements. Both of these elements are included in the
committed to the goals, policies and programs outlined in
will expand upon them, utilizing both the conclusions of
the gained experience and knowledge from flood events in
3.6 Impact of Flooding on Community Economy and Tax Base
As previously mentioned, the City of Petaluma, and more specifically, the Payran area,
has experienced significant flooding events on the average of once every five years over
the past three decades. The damage caused by these flood events has a significant impact
on the local economy (i.e. damages to home and property, City infrastructure, and local
businesses).
The flooding of 1982 caused estimated damages of $28 million, the highest monetary
level of damage sustained by the City in its history until the New Year's Eve flood event
of 2005. Total damages for this event were estimated at $56 million. The 1986 flood
City ofPetabmva Floodplain Management Plan
27
Resolution No. 2015-153 N.C.S.
September 21, 2015
Page 31
caused a reported $1 million in damages, and in 1998 an estimated $6 million of damage
was assessed.
City ofPetahnna Floodplain Management Plan 28
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 32
4. Floodplain Management Goals
The TAC reviewed and discussed existing goals from the 2001 and 2010 FMP's as well
as new goals within this 2015 update. Below is a list of the 2010 goals and
implementation status as well as a list of new goals developed by the TAC. The new
goals were discussed with the public at the August 19, 2015 public meeting for their
review and input. The primary goal of the City's floodplain management program is to
Existing Goals from the 2010 IMP:
• Goal: Increase community outreac
sponsoring floodplain manageme
National Flood Insurance Program
Status: The City and
floodplain management
as part of the flood insui
• Goal: Continue to train
Public Works staff on N]
Status: The -City's flo
cal
• Goal: Continue ar
established City,
to local dev
ions in con
related
update
community by
with the State
t Agency held several
over the past five years
Planning, Building and
agement requirements.
ittended two, week long floodplain
training courses at the Emergency
land, since the last FMP update, as
,dplain management workshops and
creek channel maintenance in accordance with
my Water Agency and other regulatory
Status: The City has worked with the County of Sonoma and the Sonoma County
Water Agency, particularly after the recent December 11, 2014 flood event, to
clear channels and creeks of debris, sediment and overgrown vegetation, within
the limits of current environmental permits. The City is working on creating a
City-wide environmental document to submit to permitting agencies that allows
expanded channel and creels maintenance. The City anticipates receiving permit
approval within fiscal year 2015-2016.
• Goal: Secure funding and complete the remaining Petaluma River Flood Control
project. The project is currently scheduled to be completed by summer of 2011.
City ofPetaluma Floodplain Management Plan
29
Resolution No. 2015-153 N.C.S.
September 21, 2015
Page 33
Status: Federal funding was allocated and construction is currently underway on
the remaining portions of the project. Construction is expected to be complete in
November 2015.
• Goal: Obtain certification from the Army Corp of Engineers for the flood wall
and flood control project; complete acceptance of the project by the City.
Status: The City will submit the necessary paperwork to the Army Corps of
Engineers to request the flood wall certification upon completion of the project.
• Goal: Pursue certification of existing levees that protect the City's waste water
treatment plant and wetlands.
Status: There is minimal impact to property or structures as a result of the de -
accreditation of the existing levees in the southern portion of Petaluma. However,
the City will continue to explore the accreditation process and opportunities with
FEMA.
• Goal: Complete the City's 'XP-SWMM model and be cooperating technical
partner with FEMA and the SCWA.
Status: The City has completed the XP-SWMM storm water model. The model
data was used, in conjunction with FEMA, to update the City's flood insurance
rate maps.
• Goal: Update the City's Flood Insurance Rate Maps once the flood control project
is complete and certified by the Army Corp of Engineers.
Status: The City will submit a Letter of Map Revision to FEMA upon completion
of the flood control project.
• Goal: Pursue obtaining an A99 designation, from FEMA, for the Payran area until
new FIRM maps are issued.
Status: The City submitted an application for an A99 flood zone determination in
a portion of the Payran residential area in 2013. On June 20, 2014, a letter of Map
Revision designating this area as an A99 flood zone became effective.
• Goal: Pursue the acquisition of McNear Peninsula as open space and natural and
beneficial areas.
City of Petaluma Floodplain Management Plan
30
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 34
Status: The City has not yet pursued acquisition of the McNear Peninsula. This
will remain as an on-going goal.
• Goal: Implement General Plan 2025 policies regarding Petaluma River Corridor
terracing to accommodate a 100 -year storm event, to all extent practicable.
Status: The City has acquired property in the Denman Flats area near Industrial
Avenue and secured funding for the purposes of creating flood terracing.
Construction is expected to occur in 2016. The City continues to require
development projects along the Petaluma River Corridor to provide flood
terracing per General Plan policies.
• Goal: Coordinate the City's PH II Storm. Water Management Plan update with
requirements of the NFIP, CRS and the City floodplain ordinance.
Status: In 2013, the City entered into an updated Phase II storm water permit with
the State Water Resources Control Board. Part of the permit requirements requires
the City to update portions of its storm water management plan over''a five year
period. The City continues to update this plan in accordance with the terms of the
State permit.
• Goal: Coordinate flood control and maintenance projects; with the Zone 2A Flood
Advisory Committee.
Status: The City, continues to coordinate Zone 2A flood control projects.
• Goal: Convert the Citv's benchmark system from NGVD 1929 to NAVD 1988 to
The City has not yet converted the NGVD1929 system to NAVD1988. A
source needs to be identified for this project. In the meantime, surveyors
,ineers use a datum conversion factor as necessary.
• Goal: Work with the Army Corp of Engineers to dredge the Petaluma River
channel within the new flood control project area to preserve flood design
capacity.
Status: $500,000 of Federal funding has been allocated for environmental analysis
and pre -permitting activities for dredging the Petaluma River. Approximately
eight million dollars of additional funding is required to complete the dredging
work. City and legislative staff are exploring additional funding opportunities for
this work.
City ofPetahrma Floodplain Management Plan
31
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 35
• Goal: Monitor and update the City's stream level gauge system and expand as
needed to maximize the use and effectiveness of the data in the operation of the
Flood Alert System.
Status: The City is in the process of adding nine additional stream gauges to its
existing system as well as updating its flood alert software system to "Flood Alert
2.0"
• Goal: Encourage local, State and Federal agencies to fund stream maintenance
programs; pursue grants for increasing flow capacity in conjunction with stream
enhancement projects.
Status: This is an on-going goal to work with agencies to identify future grants
and funding opportunities.
• Goal: Work with the Fire Department to update the telephone information hotline
and notification system. Establish a more effective distribution system, such as a
mailer in the City water bill, notifying residents of who to callfor flood
information.
Status: The City now uses Ni
alerts including flooding and
send public messaging as well
system for providing emergent
means to send public informat�
• Goal: Continue to
flood event stanch
used within the Ci
Status: The City c
100 -,year event, as
City of Petahana Hoocdplain Management Plan
he on-line notification system for emergency
closures. The City also uses social media to
to its website. The City maintains a telephone
:)rmation and continues to use utility bills as a
elop higher regulatory standards for design year
t standard, which was created by FEMA and is
is the 100 -year flooding event.
use the one percent storm, commonly known as the
storm standard.
32
Resolution No. 2015-153 N.C.S.
September 21, 2015
Page 36
5. Review of Floodplain Management Activities
A community chooses to undertake floodplain management activities both to ensure the
safety and well-being of their citizens, as well as to reduce the occurrence and damages
from flooding. The activities that the City of Petaluma has implemented are both
structural, and non-structural in nature. This section details the activities that have been
identified and reviewed as part of the Floodplain Management Plan update process. The
reason(s) why they are or are not recommended for action are also presented.
5.1 Preventive Activities
Preventive activities are considered those that keep flood `problems from getting worse.
The City of Petaluma already participates in a number of preventive activities, which
include:
• Preservation of open space and natural and beneficial features „per General Plan
2025 Policies 4-P-1 through 4-P-4;
• Established a 200 foot setback on both sides of the"Petaluma River per General
Plan 2025 policy 8-P-30;
• Mitigation requirements per General Plan 2025 policy 8-P-37;
• Zero net fill policy per General Plan 2025 policy 8'P -33A;
• Maintaining freeboard requirements;
• Drainage system maintenance;
• Maintaining building code and staffing; and
• Storm water management regulations;
The following are additional activities that wereconsidered and evaluated by the TAC
members in the previous FMP and re-evaluated and updated as appropriate in this
Prohibit Residential Development on First Floors General Plan 2025 policy 8 -P -
37(H) states that residential development shall be prohibited on the first floor of
new structures within the regulatory floodplain after remapping of the FEMA
Surface Water Management Master Plan The City of Petaluma has completed its
General Plan 2025 update. One of the tasks of the work effort was to develop a
Surface Water Master Plan, which in part addresses the hydrology and drainage of
the Petaluma watershed and how it affects hydraulic conditions in the Petaluma
River within the City's boundaries. The Plan includes technical appendices
related to surface water management including calibration of the new XP-SWMM
surface water model. This model will evaluate flood mitigation and sustainability
alternatives, including surface water detention or retention, and other structural
and non-structural conveyance facilities. The results of the study have been
City of Petaluma Floodplain Management Plan
33
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 37
incorporated into the General Plan 2025, and has enabled the City to develop and
adopt new general plan policies and regulations for new development or
redevelopment within City limits as well as to work with Sonoma County Water
Agency through the Zone 2A Committee to address regulations for new
construction in the Petaluma River watershed. City staff worked with FEMA
staff, utilizing the new XP-SWMM storm water model to update the Flood
Insurance Rate Maps in 2014, which included the Petaluma River flood control
project structural improvements. City staff will continue to use the XP-SWIVIM
model for planning surface water master plan updates as well as update the model
as necessary to reflect current conditions.
Lower threshold for substantial improvements The . City currently maintains a
50% threshold for substantial improvements, which meets the minimum
requirements of the National Flood Insurance Program, ,to properties in the
floodplain.
Protection of critical facilities The TAC committee considered the preventive
action of prohibiting new critical facilities from the 500 -year floodplain and/or
requiring new and substantially improved critical facilities to be protected from
damage and loss of access as a result of the 500 -year flood. These activities were
determined to be infeasible due to the severe limitations they would place on infill
development and commercial activity and because of the expense of required
Low Density Zoning The TAC members briefly reviewed the basic requirements
of this activity. The City's new General Plan has established new land use
designations, which includes development intensities, for all properties with its
influence. The plan creates a 400 -foot wide "River Plan Corridor" land use
classification which requires preservation of natural and beneficial functions,
open space preservation, development setbacks, and allows for peak storm water
flows. Also, since the City of Petaluma is fairly developed at this point in time,
low density zoning, as defined by the CRS Program is not feasible in the
floodplain. The General Plan prohibits first floor residential uses in the floodplain,
which would be inconsistent with allowing low density residential development.
of Required Facilities The City continues to require that
Homeowner Associations (HOAs) or other private maintenance entities inspect
and clean drainage facilities on private developments. However, the City does not
inspect the facilities with its own crews. It was decided that it would be difficult
to justify the additional City funding necessary to hire additional staff to perform
such inspections. The City has the ability to enforce its storm water ordinance
through an established code enforcement program. Also, the City and Sonoma
County Water Agency do perform routine inspections and maintenance of open
channel and piped storm drain systems within their respective jurisdictions. The
City ofPetahana Roodplain Management Plan
34
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 38
City's new General Plan includes policies, 8 -P -35(A, E and G), that requires
storm water system inspection and maintenance. Additionally, the General Plan
contains policy 8 -P -35(H) which is to advise property owners to ensure
maintenance of privately owned creeks as well as facilitate necessary regulatory
permitting and design standards for such maintenance. Other agencies within the
City of Petaluma watershed, such as the County of Sonoma, SCWA and Southern
Sonoma County Resource Conservation District have established creels
maintenance and enhancement plans for their respective jurisdictions. Typical
maintenance activities include removal of non native species and clearing of
overgrown vegetation. All maintenance work is subject to regulatory agency
permitting requirements.
The City's Public Works and Utilities Department maintains a creek stewardship
program to facilitate increased resident participationand responsibility for
maintaining privately owned creek corridors in a manner capable of conveying
flood flows while preserving riparian habitat values.
5.2 Property Protection Activities
Property protection activities that have been conducted in the past by the City of
Petaluma include:
• Removal of two residential structures from the special flood hazard area. These
structures were located at 529 Madison Street, which is owned by Clover-
Stornetta Farms.
• Acquisition / relocation of 11 other properties within the floodplain.
• Requiring elevation certificates for any new floor area built or substantial
improvements to properties in the floodplain and;
• Participating in the CRS program to reduce the insurance premiums for floodplain
• The City has
As part of this
identified in the
pursue as appro]
certificate data into a computer format using
m
ie TAC discussed the following activities, which were
FMP's for property protection and agreed to continue to
Removing; Structures from the Floodway The Water Resources element of the
new General Plan includes policy 8 -P -29(D) which states that the City shall
develop a plan and identify funding opportunities to acquire and relocate existing
structures within the regulatory floodway. The City has an adopted Multi Hazard
Mitigation Grant Plan, through the Association for Bay Area Governments, which
enables the City to qualify for Flood Mitigation Assistance and Pre -Disaster
Mitigation funding.
City ofPetabnna Floodplain Manage ent Plan 35 September 21, 2015
Resolution No. 2015-153 N.C.S.
Page 39
Flood Proofing Program The City continues to provide flood proofing
information to interested parties. Subsequent to the New Year's Eve flood in
2005, City staff worked with one local commercial property owner on providing
building flood proofing measures. The improvements have been completed. In
2011, the City required the new Petaluma Health Center at 1179 North McDowell
Boulevard to install a commercial flood proofing system as part of its facility
upgrade. A publicly funded flood proofing program would be a very expensive
undertaking, given an estimated cost of $50,000 per structure with approximately
800 properties that are presently located in the floodplain. This activity is not
financially feasible at this time. However, the City remains committed to pursuing
future grant and other funding opportunities.
records of elevation certificates d-,
Program. The City does not have
to the first FIRM in 1979.
records of elevation certific
issued by FEMA. This ac
efforts to Derform, and the T
5.3 Natural Resource P
To protect the natural are
has conducted the followi:
n and sec
water po
The following activiti
n Act
atural
15
)st-FIRM Buildings The City has
c to 1991 when it first joined the CRS
of elevation certificates that date back
3uildings The City has no
before the first FIRM was
stantial staff and monetary
this activity at this time.
of the floodplain, the City of Petaluma
in the Petaluma Marsh;
natural or riparian areas;
by the TAC members:
Additional regulations for natural and beneficial functions The TAC committee
discussed and evaluated prohibiting certain activities in the floodplain that may be
hazardous to public health or water quality; new regulations requiring floodplain
development to minimize disruption to stream channels; and developing a Habitat
Conservation Plan, which would lead to adoption of appropriate regulations.
These issues have been addressed by the City's General Plan 2025, which
includes several new policies and programs in the natural environment and water
resources elements to provide additional protection of existing waterways and
Ch), ofPetabana Floodplain Management Plan
36
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 40
sensitive habitat areas. Additionally, the City's storm water ordinance contains
several code sections that prohibit discharges in the floodplain area.
Best Management Practices The City currently participates in the State of
California's general National Pollution Discharge Elimination System (NPDES)
permit for all construction activity that results in soil disturbance of at least five
acres of total land area. Additionally, the City created a Storm Water
Management Plan in 2003 in accordance with the requirements of the Phase II
Environmental Protection Agency surface water quality order. The plan includes
best management practices for construction and municipal operations. This permit
was updated in 2013. The City is in the process of implementing updated storm
water management programs as required by the new permit.
5.4 Emergency Services Measures
The City's Fire Department has deve
for a flood emergency response.
include:
• A computerized Flood Alert Sysl
enhance the City's ability to pr
evacuation warning to residents in
• Emergency Operations Plan (EOP;
update its EOP within the next two'.
• Sonoma County operational aree
December 2014)
• F,merp,enev warning dissemination:
• (:ritinnl;tncilitiPc nlnnnina,
5.5
regularly updates its standard procedures
;lements of the flood -warning program
of numerous stream gages to
nergency flood response and
s (see Table 2 and Figure 4).
larch 2007). The City plans to
safety program
Plan (last updated
The City has been working on; the Petaluma River Flood Control Project in a joint effort
with the Army Corps of Engineers for over fifteen years. The project includes channel
widening, floodwalls along Washington Creek and the Petaluma River, a concrete
transition weir, two new pump stations, replacement of the Payran Street Bridge and the
Lakeville Street Bridge, creation of a U-shaped channel along one reach of the river, and
replacement of one railroad bridge and the removal of a second railroad bridge. The
project is substantially complete with the remaining work scheduled for completion in
November of 2015.
The City continually completes improvements to its local storm drain system through the
5 -year Capital Improvement Program (CIP) and maintenance that is updated on an annual
City ofPetahnna Floodplain ManagenientPlan 37 September 21, 2015
Resolution No. 2015-153 N.C.S. Page 41
basis. Recent improvements include inspecting and cleaning/repairing culverts, pipes and
catch basins each fall, prior to the onset of the rainy season.
Committee members also reviewed the proposed flood management projects in the City's
CIP for the next several years. These will be described in greater detail in the Action
Plan.
5.6 Public Information Activities
Since the beginning of its membership in the CRS
been conducting a variety of public outreach activi
education, and floodplain management. Some exam]
• Maintaining elevation certificates
floodplain;
• Providing map information and
inquirers;
• Mailing an annual brochure/newsl
floodplain management education
• Compliance with State law on floo
• Maintaining a flood protectiomlibr
• Providing site-specific flood and fl
FIRM and
the City of Petaluma has
sing flood awareness and
oiniz activities are:
buildings in the
to all
to all residents in the floodplain providing
for real estate transactions;
erty owners.
During the FMP process, some additional public outreach activities were evaluated and
discussed by the technical advisory committee: , They include:
Outreach to the entire community The City currently sends an annual newsletter
to the residents in the floodplain as well as the entire community. This City will
continue to participate in this activity. The City partners with the local waste
hauler, Petaluma Refuse and Recycling, to mail flyers that include flood
information to the entire community, with waste bills.
Approximately 13 percent of the floodplain residents responded to the floodplain
questionnaire that was mailed out by the City as part of the FMP update process.
The input receivedfrom the questionnaires assisted City staff in preparation of
this FMP update. The responses in the questionnaire were fairly mixed.
Approximately half of those that responded agree that most of the City is
adequately protected from flooding with 25% disagreeing and 25% neutral. In
general however, most of those that responded indicated that flooding is still a
very serious threat to lives and safety, and to the economic well-being and
transportation facilities of this area. This is one reason why the City of Petaluma
City of Petahana Floodplain Management Plan
38
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 42
will continue its efforts in floodplain management including participation in the
NFIP and CRS programs.
Expanding hazard disclosure in the City of Petaluma The City currently
distributes annual outreach letters to real estate agents and lenders with
information regarding the hazards of flooding. In 2010, City staff met with the
Northbay Association of Realtors to discuss modifications to the City's annual
outreach letter based on updated California disclosure laws. Staff agreed to make
changes and will continue to distribute the letter on an annual basis as part of the
CRS program.
are aware of several training programs
Emergency Management Institute. A ref
and Utilities Department has attended th
the advanced floodplain management
Works staff has attended local flood insl
State NFIP office. Staff will continue to
as required.
ting for City St The TAC members
that are offered by FEMA through its
-esentative from the City's Public Works
Community Rating System course and
concepts course. Additionally, Public
-ance program courses sponsored by the
Additional Map Data Through its Geographic Information System (GIS) the City
has developed a highly accuratedigital base map for use in all of its mapping
activities. This base includes streets, property lines, corporate limits and other
relevant base information. A number of digital map overlays have been created to
improve access to and quality of the flood data within the City. The City
continues to maintain the following items in its GIS system:
• Locations o
• Overlays of the February 2014 and December 2008 Flood Insurance Rate
Maps including the floodway and 100 -year floodplain boundaries;
• Updated color,aerial photography from 2011;
• Zoning designation, including the Petaluma River Corridor;
• Utility (storm drain) locations.
• Links to record 'drawings including storm drain plans.
Additionally, the City has utilized the XP-SWMM software to develop a state of
the art storm water model. The model data includes the latest available
information, including the Petaluma River flood control project, and was used by
the City and FEMA for the new Flood Insurance Rate Maps for the City of
Petaluma.
Maintenance of Elevation Reference Marks To date, the City has not formally
initiated a maintenance policy for the permanent monuments, or elevation
City of Petahana Floodplain Allanagement Plan
39
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 43
reference marks that are located throughout the City. The TAC members
evaluated undertaking this effort to assist surveyors in finding the markers and
ensuring the markers' accuracy. Committee members agreed that the
maintenance of the existing elevation reference marks in the City can be
performed by City staff. Staff is currently working on a project that will convert
the City's datum from National Geodetic Vertical Datum 1929 to North American
Vertical Datum 1988 (NAVD88). The conversion is necessary to be consistent
with the NAVD88 datum used on the Flood Insurance Rate Maps.
City of Petaluma Floodplain Management Plan 40
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 44
6. Floodplain Management Action Plan
Based on the development of floodplain management goals (Section 4), the feedback
obtained from the citizens at the public meeting, and the review of potential floodplain
management activities as detailed in Section 5, the Technical Advisory Committee has
prepared a Floodplain Management Action Plan to be implemented over the next five
years. This section provides details of the various activities that will continue, or have
been approved as part of the updated Floodplain Management Plan process. Activities
from each of the six primary floodplain management categories, i.e. preventive; property
protection; natural resource protection; emergency services; structural projects; and
public information are presented herein.
6.1 Preventive Activities
The TAC members recommend that
ongoing preventive activities, which in
6.1.1
6.1.2
floodplain lands o
opportunities pursua
Budget: staff time (o]
more
the Cityof Petaluma continues to perform its
lude
The City will continue its efforts to keep vacant
id pursue additional open space acquisition
reneral Plan 2025 ,policies. Timetable: ongoing;
s
The
its activities to enforce
of the NFIP's minimum
• Implement policies and program of the City's General Plan 2025.
• Requiring 2 feet of freeboard for first floor elevations above the base
flood elevation per General Plan 2025 Policy 8 -P -37F;
• Foundation protection;
• Requiring post construction elevation certificates for new structures,
additions and substantial improvements to structures in the floodplain;
• Requiring zero net fill on all new developments in the floodplain per
General Plan 2025 policies;
• Adhering to additional federal and/or state -mandated regulatory
standards; and
• Maintaining adequate staffing in the City's Building Division to
continue enforcing building codes for new construction and
improvements in the floodplain and throughout the City.
The timetable for these activities: ongoing; Budget: staff time (operating
budget)
City ofPetaltnna Floodplain Management Plan 41 September 21, 2015
Resolution No. 2015-153 N.C.S. Page 45
6.1.3 Storm Water Management City staff will continue enforcing City standards
on storm water management, freeboard requirements for new buildings in AE
zones, requiring local drainage plans for new developments, erosion and
sediment control regulations, and water quality regulations for new
construction. Timetable: ongoing; Budget: staff time (cost recovery through
development fees).
6.1.4
enforce policies and implement
documents.
• Surface Water Managemer
2025.
• Phase II Storm Water Mane
• Storm Water Ordinance (Cl
• Updated Grading and Er,
Petaluma Municipal Code).
• Petaluma River Watershed
Timetable: ongoing;
on City staff will continue to
if the following storm water
cent (Chapter 8) of the General Plan
it Plan and subsequent updates.
15.80 Petaluma Municipal Code).
Control Ordinance (Chapter 17.31,
Plan.
6.1.5 Drainage System Maintenance City will continue maintaining the reaches of
the Petaluma River and adjoining tributaries as well as culverts, catch basins
and piped storm drain systems that fall within its jurisdiction for debris
removal. Timetable:', ongoing; Budget: O&M operating budget;
6.2 Property Protection Activities
The TAC members recommend that the City of Petaluma continues to perform its
ongoing property protection activities,; which include:
6.2.1 Acquisition/Relocation The City has successfully undertaken efforts to
acquire/ielocate 13 properties in the floodplain in the past. The City will
continue to explore opportunities per General Plan 2025 Policy 8-P-37 (E),
such as pre -disaster mitigation and flood mitigation assistance programs, to
fund the acquisition/relocation of properties, especially in the repetitive loss
areas of the floodplain. Timetable: ongoing; Budget: staff time (operating
budget).
6.2.3 Elevation Certificates The City will continue to require post construction
elevation certificates for all new and substantially improved properties in the
floodplain. Timetable: ongoing; Budget: staff time (operating budget).
001 of Petaluma Floodplain MatiagementPlan
42
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 46
6.2.3 CRS Program The City will continue participating in the CRS Program to
assist floodplain residents in minimizing flood damages, protecting their
property, and reducing their insurance premiums. Timetable: ongoing; Budget:
staff time (operating budget).
6.3 Natural Resource Protection Activities
The TAC members recommend that the City of Petaluma continues to perform its
ongoing natural resource protection activities, which include:
6.3.1
6.3.2
contains several goals, policies and
and natural resources within the
through 4-P-4 state various protc
Petaluma River and its tributarie
Timetable: ongoing; Budget: staff t
any removal or me dific
removal or modification
permit consisting of writ
such proposed modificat
Plan. These constraints
Of oven space and a>rric
ongoing;
ihancement The General Plan 2025
ograms to protect and enhance biological
rban growth boundary. Policies 4-P-1
on and enhancement measures for the
as well as wetlands and marsh areas.
- (operating budget).
City's
or
F&
ural areas in the
(operating budget).
Ordinance requires that where
in vegetation is required, such
after obtaining a development
lanning Director, provided that
be consistent with the General
red as vital to the preservation
-neral Plan 2025. Timetable:
Erosion and Sediment Control Flood prevention activities were discussed in
Section 6.1, and included the City's storm water management activities (Item
6.1.3), which incorporate development regulations for erosion and sediment
control. These regulations also play an important role in the preservation of
natural and riparian channel sections along the Petaluma River and its
tributaries. Timetable: ongoing; Budget: staff time (operating budget).
6.3.4 Stormwater Pollution Control The City created a Storm Water Management
Plan in 2003 in accordance with the requirements of the Phase II
Environmental Protection Agency surface water quality order. The plan
includes best management practices for construction and municipal operations.
City staff prepares annual reports on each year's accomplishments and presents
that information to the San Francisco Bay Area Regional Water Quality
Control Board. The permit was updated in 2013. The City is in the process of
implementing required storm water management elements required as part of
the new permit. Timetable: July 2013 — June 2018, Budget: staff time
(operating budget).
City of Petaluma Floodplain Management Plan
43
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 47
6.3.4 Petaluma River Floodway Acquisition Implement the Phase III terracing
project in the lower Denman reach, between the twin bridges at Petaluma Blvd.
North and Corona Road. The purpose of this project is to increase floodplain
capacity in this reach while reducing localized flooding. Timetable: property
acquisition and design complete, construction to commence in spring/summer
of 2016; Budget: $2,659,000; Source of funding: Sonoma County Water
Agency Zone 2A, State Department of Water Resources Grant and
participation from private property owners.
The City has identified other natural resource protection projects which are identified in
the 5 -year storm water CIP "Surface Water Projects FY 2015-2016, Localized Flooding
Reduction Projects" list located in Appendix C of this IMP.
6.4 Emergency Services Measures
The City of Petaluma has expended significant effort in developing a sound and effective
flood preparedness program as part of its Emergency'- Operations Plan. The TAC
members unanimously approved continuing the following activities:
6.4.1 Flood Alert S, s� tem The' ,City of Petaluma will, continue to maintain and
update its computerized flood alert system for flood warnings. The City is in
the process of adding nine additional stream, gauges and upgrading to the
newer "Flood Alert 2" system. Timetable: FY 2015/2016; Budget: $174,00
Zone 2A Funds, $5,000 City funds, $85,180 in Prop 84 Funds ,and $431,400 in
uncommitted local fundiniz.
Emergency Warning Dissemination System The City of Petaluma will
continue to maintain and modify, as necessary, the means by which floodplain
residents are notified of evacuation plans or other measures to be undertaken in
the event of 'a flood. The ,,City also now uses the Nixle on-line e-mail
notification systern,,to disseminate emergency warnings. Timetable: ongoing;
Budget: staff time (operating budget).
6.4.3 Critical Facilities'?Planning The City of Petaluma will continue to maintain
and update its information on critical facilities on an annual basis. In addition,
names and telephone numbers of operators of all critical facilities in the
floodplain will be updated annually. Timetable: ongoing; Budget: staff time
(operating budget).
6.4.4 Dam Safety Program The City of Petaluma will continue participating in the
State of California's dam safety program. Timetable: ongoing; Budget: staff
time (operating budget).
City of Petaluma Floodplain Alanagement Plan 44 September 21, 2015
Resolution No. 2015-153 N.C.S. Page 48
6.5 Structural Projects
The City of Petaluma is involved in both channel modification and local storm drain
improvement projects. As mentioned in Section 6.3 of this IMP update, the City has a 5 -
year CIP storm water program titled "Surface Water Projects FY 2015-2016 Localized
Flooding Reduction Projects" list that identifies and prioritizes flood reduction projects,
cost estimates, funding sources and timelines. This list is hereby incorporated as part of
this IMP update. The following local storm drain improvement projects are a sample
from the flooding reduction projects list and will continue as part of this Floodplain
Management Plan.
6.5.1 Petaluma River Flood Control Project The City of Petaluma is committed to
completing this joint effort with the Army Corps of Engineers to provide 100 -
year level of flood protection in the Payran area. Timetable: the remaining
work includes installation of a short section of sheet pile channel wall
upstream of Lakeville Street, excavation of the transition channel downstream
of Lakeville Street and installation of rock ` rip -rap along the river bank
downstream of the Payran Street Bridge;' Approx. Budget: $3,147,000; Source
of funding: Federal Funds;. Schedule: Completion by November of 2015.
6.5.2 Local Storm Drain Improvements The City of Petaluma currently has a
Capital Improvement Plan (CIP) through Fiscal Year 2020. There are 9
projects that have been identified to expand the drainage system and alleviate
local flooding by re -contouring creeks to increase flow capacity, adding or
improving inlets to existing pipelines or installing new pipes. Some of the
• Capri Creek (North McDowell to Maria Drive); Re -contour Capri
Creek between North McDowell Boulevard and Maria Drive, along
Sunrise Parkway to reduce out of bank flooding of private property.
Timetable: Design 2015/2016, Construction 2016/2017; Budget:
$1,100,000; Source of Funds: Storm Drain Mitigation Fees, Zone 2A
Assessments; State grant.
• Phase III terracing project (lower Denman reach, between the twin
bridges at Petaluma Blvd. North and Corona Road); The purpose of this
projects is to increase floodplain capacity in this reach while reducing
localized flooding. Timetable: Design complete, Construction 2016;
Budget: $2,659,000; Source of funding: Sonoma County Water Agency
Zone 2A, State Department of Water Resources Grant, open space
grant.
City ofPetalunia Floodplain Management Plan
45
September 21, 2015
Resolution No. 2015-153 N.C.S. Page 49
Kelly Creek (at Sunnyslope Avenue); Reconstruct confluence of Kelly
Creek and utility lines at Sunnyslope Avenue and extend storm drain
pipe to nearest storm drain system with sufficient capacity. Timetable:
Design 2015/2016, Construction 2016/2017; Budget: $1,167,000;
Source of Funds: Currently unfunded. Possible Storm Drain Mitigation
Fees and Zone 2A Assessments.
Washington Creek Repair and Enhancement; Bank repair and native
riparian plantings on Washington Creek from North McDowell to
Prince Park. Timetable: Design 2015/2016, Construction 2016; Budget:
$175,000 for studies, no construction funding; Source of Funds: Zone
2A Assessments.
Various Surface Water Projects; various project on Adobe Creek,
Lynch Creek, Washing Creek and Willow Brook Creek. Timetable:
2016/2017, and 2018/2019; Budget: $2,464,000; Source of Funds: Not
yet determined.
6.6 Public Information
The public's response to the City's questionnaire mailed to all the residents and property
owners in the floodplain indicated that residents in the City's floodplain wish to be better
informed of flood protection activities and flood awareness issues. The TAC members
committed to continuing the City's current outreach efforts and expanding them, as
presented below:
Map Information and Flood Insurance Requirements The City will continue
to provide map information and flood `insurance purchase requirements as a
service to all citizens who contact the City seeking such information. City
staff will keep the maps updated and will continue to publicize the service.
Timetable: ongoing; Budget: ;staff time (operating budget).
6.6.2 Annual Brochure / Newsletter The City has been mailing a flood awareness
newsletter, every year to residents in the floodplain as well as all residents
within Petaluma. The City will continue this outreach. At the August 19, 2015
public meeting, 'City staff heard concerns from the public that the flood
information sent in bill stuffers may not reach all residents because many now
receive bills electronically. The TAC agreed that the City will examine this
issue and ways to implement the necessary changes to improve the system.
Timetable: ongoing; Budget: Operating budget will include additional funds to
cover extra printing and postage.
6.6.3 Additional Outreach Strategy City staff will continue to develop, coordinate,
and evaluate annual outreach activities in addition to the preparation and
City ofPetahnna Roodplain Management Plan 46 September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 50
mailing of the annual brochure. City staff will continue to assess the local
hazard, discuss appropriate flood safety measures, develop an outreach activity
to address a specific issue and establish the process that will be followed to
implement and evaluate its effectiveness on an annual basis. Timetable:
ongoing; Budget: Staff time plus costs for printing materials for display or
distribution to City residents (operating budget).
6.6.4 Flood Hazard Disclosure The City of Petaluma will continue its compliance
with state law on flood hazard disclosure for real estate transactions.
Timetable: ongoing Budget: Staff time plus printing and mailing costs
(operating budget).
6.6.5 Flood Protection Library The City will continue maintaining and updating a
collection of pertinent flood protection materials at the City's public library.
These documents will be entered into the library's card catalog to allow
patrons easy access to publications related to flooding and flood protection.
Timetable: ongoing; Budget: staff time (operatingbudget).
6.6.6 Additional Map Data
including various laye
flood management.
software to develop a
includes the latest ava
IN
1929 to N(
staff time (
Cite ofPetahnna Roodplain Management Plait
The City already maintains a detailed GIS database
rs of information that are pertinent to flood data and
Additionally, the City has utilized the XP -SWMM
state of the art storm water model. The model data
Table information, including the Petaluma River flood
was used by the City and FEMA to create new Flood
)r Petaluma, effective February 19, 2014.
c Maintenance. The City will initiate exploration of a
-rtical datum fiom National Geodetic Vertical Datum
Vertical Datum 1988. Timetable: Ongoing; Budget:
11 yA
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 51
7. Implementation and Evaluation
The Petaluma City Council voted to adopt the updated Floodplain Management Plan at
their September 21, 2015 meeting.
The City's CRS Coordinator will work with other city staff as well as current and future
technical advisory committee members to monitor implementation of the floodplain
management activities, review progress on an annual basis,; and recommend revisions to
the plan in an annual report. This report will be submitted to the Petaluma City Council,
the Federal Emergency Management Agency, local newspapers, posted on the City's web
site, and will be made available to the public.
City of Petaluma Hoodplain Management Plan 48
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 52
Appendix
Appendix A Water Resources Element, Chapter 8, Petaluma General Plan 2025
Appendix B Natural Environment Element, Chapter 4,
Petaluma General Plan 2025
Appendix C Surface Water Projects FY 2015/16, City of Petaluma
City of Petaluma Floodplain Management Plan 49
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 53
Appendix A
City ofPetah nta Floodplain Management Plan 50
Water Resources
The Water Resources Flement brings four components
(eater Supply and Ihmand, Recycled Water,
Wastewater, and Surface Water) of Petalumds water
systems to the forefront, equal in weight to the other
elements, rather that[ obscured within an element
covering a multitude of community facilities topics.
As quoted by Mark Twain "Whiskeys for drinking,
water's for fighting"; water has been the source of the
most intensive part of the work effort of this Plan, and
certainly much ofthe controversy and public discussion.
The approach to the community's water resources,
through direction from the City Council, has been to
address water related issues holistically. Recognizing
the scarcity of the resource and the need to us water
in the most environmentally sensiti`v and responsible
manner has resulted in an element that offers innovative
solutions to meet the community's needs now and well
into the future.
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 54
Petaluma General Plan 2025
_8..1_._WATER SUPPLY_ AND DEMAND._____
INTRODUCTION
Ilic Water Supply and Demand section of the Water
Resources Element presents a plan for providing
Peraluma's residents and businesses with a safe, reliable,
and high quality source of water through 2025 and
beyond, using a mL of imported water purchased
from the Sonoma County Rater Agency (SC IA),
recycled water, water conservation and groundwater. A
challenging and more complex environment requires
development of a new approach towards yvater supply
through the General Plan period. Modest population
growth translates Into water demands increasing from
3,600 million gallons per year (11,000 acre -feet per
year) in the baseline year of 2002, to approximately
5,139 million gallons per year (15,775 acre -feet) in
2025. Regulatory and environmental issues have
delayed the SC\VRs expansion of its water transmission
system. Consequendy, projected demands will exceed
the amount of ester the SCWA can provide without
expanding its water transmission system. Should the
SCVA complete expansion of the water transmission
systern prior to 2025, the City may revisit this plan ,
particularly regarding the volume of tertiary =)-ded
water provided for offset.
BACKGROUND & CONTEXT
Petalum; s water supply prior to 1961 seas pprovided by
local groundwater, supplemented by }eater from Lavyler
Reservoir and the Station #7 filter plant. Wafer quality
eoncems prompted the City to investigate alternate
water supplies. On May 9, 1960, the City of Peraluma
and the North Nfarin Water District entered Into an
agreement vvith the SCWA for the annual delivery
of 4,500 acre -feet and 10,000 acre -feet of water,
respectively. Ift response, the SCWA began construction
of the Petaluma Aqueduct, which Included a 16 -112
mile long 24 -inch and 33 -inch diameter pipeline from
Santa Rosa to Petaluma, a booster pumping plant, and a
six million gallon reservoir near Lake Ralphine.
Tire Petaluma Aqueduct began operating in December
1961. ' lic superior quality aqueduct water quickly
tKeatne die City's primary source of water. The City
continues to maintain and operate local wells to meet
peak demands and emergency needs. Today, the Santa
Rosa Aqueduct and the Russian River- Cotati Intertie
carry Russian River water from SCWA diversion
facilities located in the Wohler and Mirabel areas to
Petaluma via the Petaluma Aqueduct. In addition,
8.2
00, ofPetabnna Floodplain ManagenrentPlan
SCNKIA operates three groundwater wells in the Santa
Rosa Plain that supplement the water supply- from
the Russian River. Treatment is provided by chendcal
addition for disinfection and corrosion control.
Petaluma's primary source of water continues to be
Russian River water purchased from the SCWA. The
SC Mk supplies water to Petaluma and seven other
water contractors under the Restructured Agreement
For Rater Supply. Under the Restructured Agreement,
PetalumA monthly seater supply entitlement from the
SC\\7A is an average -day maximum month supply of
21.3 mgd and an annual supply limit of 13,400 arse -
feet per year (4,366 million gallons)'. The SCWA also
supplies water to Petaluma and other water contractors
under the Temporary Impairment Memorandum of
Understanding (MOU).'ihe MOU governs allocation
of water during periods of Temporary Impairment.
Under the MOU, Petaluma is obligated to use its best
efforts to limit Its demand on the'liansmission System
to 17.1 mgd. The NIOU supersedes the Restructured
Agreement. The City supplies approximately 68 percent
residential and 32 percent non - residential customers,
which Include commercial, institutional, and industrial
customers. In the baseline year of 2002, the City
delivered more than 3,600 million gallons (11,000
acre -feet) of potable yvater to Petalu pads residents and
businesses.
Water Rights And Supply
The State Water Resources Control Board (Board) is the
agency .rich authority- over water rights in California.
California ester rights permits often contain terms
limiting rates of direct diversion and te- diversion.
Direct diversion refers to water diverted directly from
stream llows. Re- diversion refers to water that has first
been diverted to storage in a reservoir, then released
and diverted again (re-diverted) at a point downstream.
'the Agency operates its facilities under four (4) separate
Board permits. 'The combined direct diversion and re-
diversion under all four permits is limited to 75,000
acre -feet (24,400 million gallons) per year, with a
maximum diversion rate of 180 cubic feet per second.
As reported in the SC\VWs ' Water Supply Workshop
Report (i�rovember 2004), the objective of the \\rater
Project Is to provide a safe, economical, and reliable
water supply to meet the defined current and future
water supply needs in the Agencys service area. Tire FIR
rL.nua1 entide,nent li niti ,-ent not hvluded in the ,:_tar supply
ipecunrrrsptiortothtlithAtrta degreancnt.
51
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 55
Water Resources ?i
Table 8,1 -1: Existing and Projected Water Demands
Year
Total Annual Total Arnvaf
Water Water Demand
Demand (MG) (AF)
Average Dally
Water Demand
(MGDJ
Maximum Day
Water Demand
(MGD)
tblawrnum Manth
Water Demand
(MG)
Average Day
Maximum Month
(MGD)
2005
3,845
11,799
10.5
19.4
447
16.5
2010
4.364
13,391
12.0
22.0
564
18.8
2015
4,723
14,493
12.9
23.8
610
20.3
2020
4,898
15,031
13.4
24.7
633
21.1
2025
5,139
15,775
14.1
25.9
664
221
Table 8.1 -2: Projected Total Water Use
Water Demand Projection
Water use by202S SCW4 Supple Shortfall
Annual 5,139 million gallons 4,366 million gallons 773 million gallons
Average Day 22.1 mgd 17.1 mgd 5 mgd
Maximum Month
will be designed to address the deficiencies identified by
the Court of Appeals. As of February 2006, the SCII'A
estimates the EIR sill be completed by October 2007.
Endangered Species Act
The National Oceanic and Atmospheric Administration
Fisheries NZ OAA Fisheries) is the Federal Agency with
authorityto address Endangere.dSpeciesAet (ESA) issues.
NOAA Fisheries has listed Coho Salmon, Steelltead and
Chinook Salmon as "threatened" in the Russian River
under the ESA. 'there are two levels at which species
are listed: threatened or endangered. An "endangered"
species is one that is in danger of estincdon throughout
all, or a significant portion of its range. A "threatened"
species is one that is likely to become endangered in the
foreseeable future.
The SCWA submitted a Biological As.scssincnt (BA) to
NOAA Fidicriei in 2004. The next step is liar NOAA
Fisheries to prepare its Biological Opinion (BO), which
is a detailed report of their opinion as to whether or not
the actions described in the BA are likely to jeopardize
the continued existence of the listed species or result In
the destruction or adverse modification of designated
critical habitat.
WATER DEMAND
'the City completed an analysis of water supply
demands based on the Draft General Plan 2025 and
compared them to the SCWA hater supply, The City's
City ofPetahrnla Floodplaln Management Plan
existing water demands were assessed from City water
meter records, seater supply production values, and
distribution system operation records for the baseline
yaarof2002, Theprojccted :annuaiwaterdemandslverc
then developed based on anticipated land use changes
from the 2002 base year through buildout of the Draft
General Plan 2025, based on the preferred land use plan
considered by the City Council in Nlevember2005'. The
land use changes were divided into nine tiers of possible
development projects, ranging from projects under
construction, projects in formal review, and projected
potential projects resulting front land uses identified in
the Draft General flan 2025. 'These tiered projects were
allocated to five -year increments within the planning
period to set the potential timing of the water demand
in the system as Illustrated in Table 8.1 -1.
The maximum month and maximum daily water
demand projections were based on an assessment
of historic water demand t nulitiom. The annual
demands, mvcimum month demands, and maximum
day demands for 10 years from 1994 to 2003 were
reviewed to identify peaking factors associated with
maximum month and maximum day demands in each
year. 'the average maximum day peaking factor over the
10 -pear period w= 1.84 times the average annual daily
rate. The average maximum month peaking Factor over
the 10 -year period w u 1.55 times the average monthly
"she 1tiaT 2002 was scircicd as the bmllnc because of the good
cotrdadoa bet. »tn tutee careurrpdon elan ztd t stable land
ute drta Rt the "U 2002-
8.3
52 September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 56
Petaluma General Plan 2025
demand. 111csc 10 -year average puking I:,ictors were
annual demand shortfall of 773 million gallons (2,371
applied to tile. annual projections to obtain maximum
zcre -feet) per year and in ADi EM demand shortfall of
month and maxi t urn day projections.
5 nigd. The analysis further indicates that the shortfall
2015
in ADAL&I may begin occurring during peak demand
- lrruugh build -nut of the Draft General Plan 2025,
periods as early as2007 and the annual demandshortfall
Petaluma's total demand by 2025 is projected to be
may begin occurring as early as 2010.' The projected
approximately 5,139 million gallons annually (15,775
demands are presented in Table 8.1 -2.
acre-feet). Petalutna's current (2006) entitlement of
Recycled Water
4,366 million gallons (13,400 acre -fete) per year from
217
SCVIA alone will not be sufficient to meet the growth
431
projected through 2025, The analysis also shows that
Water Conservation
by 2025, the average day maximum month (ADMM)
91
demand, or peak demand, will be 22.1 mgd, which
228
exceeds the Temporary Impairment NIOU limit of 17.1
Groundwater
nrgd.s By 2025, this analysis indicates there will be an
0
0
h�th Rnoss Run using rtc)dad.,ats btgianing in 2006, t_ie
r•llw Average ITS)• Maximum 'Month, r,r AI)XIM, is the avoige
shotcEll iaADNr\ Lmuldoecerin2008 , and an annual dtott&kll
daily Ilowrate for dic month with dw tnnst water usc.
could .L^ in 2011.
Table 8.1 -3: Current and Projected Annual Water Supply
Annual Supply Conditions
Total Annual Water Supply in Million Gallons
2005
2010
2015
2020
2025
SOMA
3,845
4,055
4,212
4,240
4,364
Recycled Water
0
217
331
431
464
Water Conservation
0
91
180
228
2s0
Groundwater
0
0
0
0
61
Total Supply Sources
3,845
4,363
4,723
4,899
5,139
Annual Supply Conditions
Total Annual V ✓a ter Supply in
Acre -feet
SCWA
11,799
12,443
12,923
13,009
13,397
Recycled Water
0
667
1,017
1,322
1,425
Water Conservation
0
280
553
700
767
Groundwater
0
0
0
0
186
Total Supply Sources
11,799
13,391
14,493
15,031
15,775
Soc•.^v- Dadsnn Fn3in �,1as
Table 8.1.4: Current and Projected Maximum Month Water Supply
ADIdM Supply Conditlons Average Daily Flow During Maximum Month inMillion
S-Doti on fysncros gas
8 -4
City ofPetahnna Floodplain Management Plats 53 September 21, 2015
Resolution No. 2015 -153 N.C.S.
Page 57
Gallons per Day
2005
2010
2015
2020
2025
SCWA
16.5
16.8
169
16.6
16.7
Recycled Water
0.0
1.5
2.5
3.4
3.6
Water Conservation
0.0
0.5
0.9
1.1
1.3
Groundwater
0.0
0.0
0.0
0.0
0.5
Total Supply Sources 16.5
18.8
20.3
21.1
22.1
ADhIM
S-Doti on fysncros gas
8 -4
City ofPetahnna Floodplain Management Plats 53 September 21, 2015
Resolution No. 2015 -153 N.C.S.
Page 57
WATER SUPPLY
Ilse Water Supply and Demand Analysis Report is
a long -term plan that increases the use of recycled
crater, expands the water conservation program, and
includes the inoderate use of groundwater to meet
increasing potable ~rater, demands, until such tirne as
the SCV k is able to ttpand its crater transmission
system. These opportunities translate into viable water
supply options that were evaluated by the City with the
goal of identifying the appropriate mix of water supply
that allew the City to rnttt its long -term water supply
needs. The planned nrix of water supply sources to meet
projected annual and maximum month water demands
are illustrated in Tables 8.1 -3 and 8.1-4 respectively.
RECYCLED WATER
lYater recycling is the treatment and management of
municipal, industrial, or agricultural wastenater to
produce water that can be reused for beneficial uses,
and o0`set demands fisr drinking water supplies (potable
water), Water recycling p" id" an additional source
of water that can he used for purposes such as irrigation
or environmental restoration. 'While historically, the
City of Petaluma has used recycled grater primarily For
agricultural irrigations the City toys has an opportunity
to use recycled water as a water supply that can offset
current and future potable water demands- For
additional information see the Vrater Supply and
Demand Analysis Report (Dodson 2006).
The City is constructing the Ellis Creek Water Recycling
Water Resources
Table 8.1 -5: Summary Tertiary Recycled Water
Customers
Customer Type
Tota /AOMM
Number of
Floyrrate (mgd)
Customeafsites
Golf Course
1.0
2
Open Space
0.2
3
Park
1.3
W
School
1.0
14
Turf
0.1
1
Total
3.6
62
Facility (WRF), expected to come on line in 2009. 'ihe
A,tility-willproduce tertian recycled water in accordance
with California Department of Health Services (DHS)
Title 22 retluitements far unrestricted use. Allawablt
irrigation uses for tertiary recycled water include parks
and playgrounds, schoolyards, residential landscaping,
unrestricted access golf courses, food crops, and other
uses permitted by the DHS through the California
Code of Regulations.
The recycled NVIter program consists of a least cost
combination of tertiary and secondary treatment
scenarios that, in combination, distribute all recycled
water from the Cit4 Ellis Creek Water Recycling
Facility during the period of restricted discharge into
the Petaluma River, provide system Flexibility, ana create
sufficient potable use offset. Potable offset is defined
as current potable water use that is replaced by tertiary
water use.
71Y Ellis Greek Miscr Reocting ErtrditT rrearing emrtpletion, trill proride tewap reovled mater to opser par role tbnreort
01j, ofPetahnna Floodplain Management Plan
8 -5
54 September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 58
Petaluma General Plan 2025
'Mc \Dater Resources Plan calls fora phascd approach to
further implement the use of rec-'Meet water throughout
the City of Petaluma. The first customer is the Rooster
Run Golf Course -which uses approximately 138 MG/
year ofcvaterfor irrigation of 126 acres- Since theRooster
Run Golf Course can be supplied with secondary
recycled water by the existing reqrled water system, the
backbone pipeline was designed and built to be in use
by summer 2006,'llie pipeline will temporarily connect
to the existing secondary recycled crater system to serve
Rooster Run Golf Course until the tertiary system
goes online in Year 2009. A summary of the type of
customers and potable offset demands are stunmatized
in Table 8.1 -5.
The tertiary recycled water distribution system will
eventually be expanded to serve irrigation needs in 311
four quadrants of the City: Service to these areas will
require significant capital improvements including a new
pipeline distribution system, two 1 -0 MG reservoirs,
pump station and eventually an increase in the tertiary
treatment capacity of the Ellis Creck WRE The system
would be expanded incrementally through 2025.
WATER CONSERVATION
11e Citys water conservation progrun focuses on
thirteen best management practices (BNIN) or -water
demand management measures. The City utilizes
-utter conservation BNM as a method to reduce water
demands, thereby reducing -cater supply need for the
City:
Tltc City is it member of the California Urban \Vatcr
Conservation Council (CUWCC), The CUWCC
was created to assist in Increasing water consenadon
statewide, under a Memorandum of Understanding
(MOLD. As signatory to the MOU, the City has pledged
their good faith elfurt towards implementing BMPs
identified in the CUWCC MOU Regarding Urban
\ \rater Conservation. Tltc City signed the CU \VCC
MOU on January 31, 2002, and submits annual BMP
reports to cite CUWrCC in accordance with the' MOU.
The MOU requires that a water utility implement only
the MIN that are economically feasible. If a, BMP Is
not economically feasible, the utility may request an
economic exemption for the MIR The City has not
requested economic exemption from any of the BNIN
at this time.
Table 8.1 -6 includes the CLT%VCC BNIPs currently
performed by the City. Tic CUVICC BMP 10,
,r —o- i_xa.:r..
8 -6
Cig, ofPetahmra Roodplain Management Plan
Wholesale Agency Assistance Programs, does not apply
to the City since the City does not wholesale ,eater to
another entity.
Tltc City* continued implernenartion of the Aairicen
.eater conservation BNIPs will provide water use
reductions throughout the planning period. However,
to increase water conservation in the future to meet
projected water demands, sewn additional BNIPs will
be implemented and are listed in Table 8.1.7. The
additional BMP program is scheduled to start in 2008.
the new water conservation measures will supplement
the Citys existing water conservation program, and
will be phased In over the years 2008 — 2025. The
new measures are projected to boost annual savings by
approximately 250 million gallons, and reduce peak day
dentaniic by 1.28 mgd. The estianated total cost is $8.3
millions. In October 2005, the City began work on
a \Cjater Conservation Plan to idendfy potential water
conseration measures and programs that are beyond
the scope of the BMPs. 'This effort will conclude in Fall
2006, and -will include a program for additional water
conservation savings.
The proposed water conservation program, combined
with the proposed recveled -cater program, will save a
total of 714 million gallons of potable -a-ater annually;
and reduce peak day demands by 4.85 mgd. the
remaining potable -water shortfall through build -out
of the Draft General Plan 2025 of 59 million gallons
annually and a peak day demand of 0.15 mgd may need
to be met through the measured use of groundwater-
GROUNDWATER
The City intends to use groundwater primarily f'or
standby or emergency conditions and will meet all
normal demands from surface water (SCMQ, recycled
- eater, and conservation in the near term (Dodson
Engineers, 2006). the City's intent is to continue to
provide minimurn month average day demands from
its well supply u a short -term emergency; drought, or
SC\1rA supply containment source of water. Following
past practices, groundwater use may be utilized during
the planning period to meet peak water demands in the
summer months. In 2006 the City had six active -wells
and nine inaerice wells. Groundwater will also serve as a
water supply if SCMA. deliveries are curtailed.
At the end of the planning period in years 2024 and
2025, the water supply available to the City from
SC\ \FA, in combination with recycled water and water
55
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 59
Water Resources
Table 8,1.6: City Water Conservation Best Management Practices
Best Management Practices, BMP
BMP 01:INater Survey Programs for Single Family and Multi - Family Residential Customers
BMP 02:Residenlial Plumbing Retrofit
BMP 03:System Water Audits, Leak Detection, and Repair
BMP 04:Metering with Commodity Rates for all New Connections and Retrofit of Existing
BMP 05:Large Landscape Conservation Programs and Incentives
BMP 06:1--ligh- EflicientyWashing Machine Rebate Programs
BMP 07:Public Education Programs
BNIP08:School Education Programs
BMP 09:Conservation Programs for Commercial. Industrial, and Institutional Accounts
BMP 10:10lnolesale Agency Assistance Programs
BMP I1:Conservation Pricing
81-AP 12:Conservation Coordinator
BMP 13:NJater Waste Prohibition
BMP 14:Residential and Commercial Ultra Low Flow Toilet (ULFT) Replacement Programs
Table 8.1.7: Additional City Water Conservation Best Management Practices
Measure Description
Recirculating Hot Water System Require all new single family and multi family housing units to have a recirculating hot
for New Developments water system installed. Tnis Includes a recirculation pump and Insulated hot water pipes. An
alternative may allow a tankless, instant hot water system.
High Efficiency Toilet Installation Provide free contractor Installation of high efficiency toilets, either dual flush (613 liter) or 4
litets•per•flush toilets.
Rain Sensors Provide sensors to customers for their automatic irrigation system (controller). Users install
sensors themselves.
Landscape Education Training Combination of three types of training classes: (1) Xeriscape, (2) Homeowner Irrigation, and
(3) Promotion of water efficient plants.
ET Controller Rebates Provide rebates for purchase of weather adjusting (ET) irrigation controllers to customers.
Users install controllers themselves.
Landscape Requirements Establish and enforce new landscape requirements for newnon- single family landscaping.
Commercial Urinal Rebates selectively provide rebates to businesses to convert to efficient (03 gallons /flush) or waterless
urinals subject to high use, such as restaurants, theaters, schools, etc.
conservation may not he sufficient to meet annual or
maximum month demands. 'ibis assumes buildout
of the General Plan, .which may or may not occur by
2025 based on rnarket, growth management, and
interim politics. The potential shortfall is estimated at
186 acre -feet per year, which is as;ilable. by pumping
approximately four of the existing wAls. A ebrabination
oFedsting swells delivering an average of 0.5 MGD over
the course of the four summer months ~would satisfy the
annual supplemental supply condition of 186 acre -feet
City of Petahnna Moodplain Management Plan
011
(60.75 million gallons). E.dsting welt stations «ill be
rehabilitated and individual }wellhead treatment will be
provided to meet water quality standards in place at that
time. 'lhese flow rates arc significantly below cite CiVs
historic groun ivrater pumping levels.
the groundwater would also continue to be used to
supplement the maximum month demands. Combining
SC4irA water, recycled tis-ter and water cone -ation as
described above leaves a pea!w day demand shortfall of
Resolution No. 2015 -153 N.C.S.
B -7
September 21, 2015
Page 60
Petaluma General Plan 2025
about 0.15 MGD at the end of the planning period.
'Ilils peak demand can he stet by the 0.5 [v[GD
pumping of grouudvxter to meet annual demands
during this period, reducing the surface vv -ater deliveries
to less than the maximum month limit. 'this would
provide additional flexibility and reliability in meeting
tnaximurn daily demands with either surface water or
groundwater during the month.
Additional opportunities For %rater conservation,
beyond those provided above, could be evaluated for
applicability such as permitting gray AN-Ater systems,
composting toilets, drywells for drinking fountains;
or other best management practices developed in the
future. Any service or system connected or receiving
service from the municipal source must be. in frill
compliance with public healtll and safety regulations.
GOAL 8 -G -1: Water Supply and Demand
Provide a safe, reliable, high - quality, economical
and sustainable source of water to meet the
community's needs.
Policies and Proqrams:
B.P.1 Optimize the use of Imported water from the
SCWA to provide adequate water for present
and future uses,
A. Prepare, implement, and maintain long -term,
comprehensive water supply plans and options
in cooperation with the appropriate state and
federal agencies, regional authorities, water
utilities, and local governments.
8. Support regional efforts towards ensuring that
Imported water is reliable, cost - effective, and
Is of high quality.
B.P.2 Continue to work to maintain water supply
agreements with SCWA to ensure adequate
potable water.
8 -P -3 Work with the Sonoma County Water Agency
on the South Transmission System Project
to develop the parallel aqueduct along the
City's preferred eastside alignment in order to
improve reliability of water supplies,
B -P-4 The City shall routinelyassess its abilityto meet
demand for potable water.
8 -a
A The City shall continue to monitor the demand
for water for projected growth against actual
use, and ensure that adequate water supply
Is in place prior to, or In conjunction with,
project entitlements.
B. The City planning staff will discuss water
supply with the developer for each new
development early in the planning process
and inform Water Resources staff of upcoming
demands as provided by the applicant.
C. The City shall maintain a tiered development
record to monitor pending and projected
developments to allow a reasonable forecast
of projected water demand.
D. The City shall upgrade utility billing software
as necessary to provide the ability to efficiently
track and project water demand trends
Including, but not limited to, the following
parameters.
• Land use categories
• Customer classifications
8 -P.5 Develop alternative sources of water to
supplement Imported supply,
A Expand the use of recycled water to offset
potable demand.
B. Expand %,later conservation to further Improve
the efficient use of potable water.
C. Continue to use groundwater to meet
emergency needs.
B -P -6 The City shall utilize the Water Demand and
Supply Analysis Report, June 2006 and any
amendments thereto, for monitoring, assessing
and improving the City's municipal water
supply.
A Require Implementation of adopted Water
Master Plan through conditions of approval
for all public and private development.
B -P -7 Limit the provision of potable water service
to lands within the Urban Growth Boundary
with the exception of the provisions outlined
in the Urban Growth Boundary measure and
Incorporated into Chapter 2 Land Use, Growth
Management, and the Built Environment.
00; ofPetah nta Roodplain ManagententPlan 57
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 61
Goal 8 -G -2: Water Supply and Demand
Continue to maintain a high level of customer
service and satisfaction.
Policies and Programs:
8 -P.8 Provide timely responses to customer
service requests and improve educational
opportunities.
A. Implement monthly utility billing.
B. Convert to an automated meter reading
system (AMR).
C. Provide additional information to customer
on their water use through utility billing and
new technology, such as web -based service
programs. Additional information shall include
amount of water used by tier for the current
billing period, charge for each tier, amount of
water used for wastewater charge during the
current billing period, and recent water use
history.
D. Expand community service programs such as:
• Conducting customer statistical analyses.
+ Conducting consumer surveys.
• Providing customer leak detection services.
+ Participating in the Business Water Project
by the Business Environmental Alliance.
• Developing a community recognition
program that recognizes efforts to
Implement Best Management Practices.
Goal 8 -G -3: Recycled Water
Maximize the use of recycled water as a potable
water offset to manage water demands, and
meet regulatory requirements for wastewater
discharge.
Policies and Programs:
8 -P -9 Provide tertiary recycled water for Irrigation
of parks, playflelds, schools, golf courses and
other landscape areas to reduce potable water
demand.
A. Expand the Ellis Creek Water Recycling Facility
to provide tertiary and secondary recycled
water as outlined in the Recycled Water
Master Plan.
B. Operate and maintain the Ellis Creek Water
City ofPetahiina Koodplain Management Plan
j1
Water Resources
Recycling Facility to produce recycled water to
meet or exceed current regulatory standards.
8 -P -10 The City may require the use of recycled water
through the City development review process.
A. New development may be required to install
a separate recycled water system as deemed
necessary and appropriate by the City to offset
potable demand.
B. Evaluate where the most appropriate
potable water offset Improvements can be
Implemented.
C. Determine the appropriate means of
potable offset. Individual project systems
may be required in addition to City- required
Improvements and/or fees relating to the
recycled water offset system.
8 -P -11 Tha City may continuatowork with agriculturaI
users to reuse secondary recycled water. In
addition, the City may purchase land as a
backup reuse site, if deemed necessary and
appropriate to meet system needs.
8 -P -12 Provide water of adequate quality and quantity
to meet customer needs. The City, at its' sole
discretion,duringthe environmental review and
entitlement process, will determine whether a
given customer's supply will be potable water,
tertiary recycled water, secondary recycled
water, groundwater, or a combination of
these.
8 -P -13 Work to convert existing potable water
customers Identified under the City's Recycled
Water Master Plan to tertiary recycled water
as infrastructure and water supply becomes
available.
A. Require implementation of adopted Recycled
Water Program Improvements through
conditions of approval for all public and
private development.
8.9
58 September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 62
Petaluma General Plan 2025
Goal 8 -G -4: Wastewater
Manage the wastewater collection and treatment
system toad dress 100 percentcapture and treatment
of the City's wastewater in an economically and
ecologically sound manner.
Policies and Programs:
B -P -14 The water recycling facility shall he operated
and maintained in compliance with all State
and Federal permit requirements.
B -P -15 Capacity of the water recycling facility shall
be maintained, and expanded as necessary, to
keep pace with the city's growth.
A Require implementation of adopted Water
Recycling Facility master Plan and distribution
program improvements through conditions
of approval for all public and private
development.
B -P -16 Comply with the current Statewide General
Waste Discharge Requirements concerning
the operation and maintenance of the City's
sanitary sewer collection system.
A Perform condition assessment of existing
facilities.
8. Survey facilities and maintain current system
maps.
C. Perform regular cleaning and inspection to
help eliminate sanitary sewer overflows.
D. Fund collection system infrastructure
replacement on a 100-year life cycle.
E. Regularly update the sanitary sewer flow
model and make improvements necessary to
support development.
B -P -17 Maintain and expand public access and
educational opportunities at the Ellis Creek
Water Recycling Facility.
9.10
City ofPetahana Floodplain Management Plan
Goal 8 -G -5: Water Conservation
Maximize water conservation measures to improve
water use efficiency and reduce overall water
demand.
Policies and Programs: _
B -P -1B Reduce potable water demand through
conservation measures.
A Implement the Water Conservation Plan that
Incorporates conservation measures beyond
the Best Management Practices developed
by the California Urban Water Conservation
Council.
8. Continue to expand the application of Water
Conservation Best Management Practices,
C. Implement the City's Water Drought
Contingency Plan to assist citizens in reducing
water use during periods of water shortages
and emergencies.
D. Revise the City's Landscape Ordinance to
encourage, or as appropriate require, the use
of water- efficieht landscaping.
E. Regularly update regulations, codes and
agreements to implement water conservation
and discourage wasteful use of water,
F. Enforce conservation measures that eliminate
or penalize wasteful uses of water.
59
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 63
Goal $ -G -G: Groundwater Supply
Preserve and maintain the City's groundwater
resources,
Policies and Programs:
8 -P -19 Ensure adequate water supply during
emergency situations by developing potential
groundwater resources and aquifer storage
capacity, combined with ma nagementof surface
water, to meet overall emergency water supply
objectives. The City's groundwater resources
shall be preserved to meet emergency needs
and to offset peak demands.
A. The City will develop additional wells to supply
the average minimum month water demand.
B. Work cooperatively with the County of
Sonoma to protect and preserve Petaluma
groundwater resources, including the
preservation and enhancement of significant
recharge areas within the watershed.
C. Evaluate the need and feasibility of developing
limited wellhead treatment facilities to Insure
water quality requirements.
D. Preserve oak woodlands, upland native
grassland, and wetland areas identified as
contributing to groundwater recharge; at
a minimum for areas identified within the
Groundwater Feasibility Study, Technical
Memo 4, dated February 2004 (Technical
Appendix Volume 4).
8 -P -20 Manage groundwater as a valuable and
limited shared resource by protecting potential
groundwater recharge areas and stream sides
from urban encroachment within the Petaluma
watershed,
See, at a minimum, those areas defined as
possible recharge areas set forth in Technical
Appendix Volume 4, Groundwater Feasibility
Study, 2004, or revisions thereto.
A. Control construction of impervious surfaces
in groundwater recharge areas. Potential
recharge area protection measures at sites In
groundwater recharge areas include, but are
not limited to:
• Restrict coverage by impervious materials;
• Limit building or parking footprints;
• Require construction of percolation ponds
on site.
City of Petahana Floodplain Management Plan
60
Water Resources , ;;"
• Require surface drainage sivales
B. Urge the County when reviewing development
applications, to examine the combined Impacts
of new septic tanks placed in proximity to
wells and the ability to maintain adequate
protection of groundwater resources. The
County should examine the cumulative impacts
of the allowed development densities in the
West Petaluma Specific Plan area and compare
the results to established water quality
standards. Test wells should be required prior
to issuing any building permits.
8 -P -21 Protect groundwater quality from surface
contamination by requiring 100 foot sanitary
seals on all new municipal water supply wells.
Resolution No. 2015 -153 N.C.S.
8.11
September 21, 2015
Page 64
Petaluma General Plan 2025
8.2 PETALUMA'S WATER DISTRIBUTION
SYSTEM
The major water distribution fircilitics owned and
operated by the City consist of approximately 200
miles of pipeline, ten treated water reservoirs which
provide 13 million ,gallons of storage, and eight booster
pull)]) stations. The City's exiling water distribution
system is divided into five pressure zones. Zones 1,
2, and 4 are supplied by turnouts along the Petaluma
Aqueduct. 'lite higher elevation areas which comprise
Zones 3 and 5 are supplied by booster stations that
draw water From Zone 2- Transmission mains are
mostly 10 and 12 inches in diameter, although pipes
with diameters of up to 16 inches exist as well as pipe
diameters as small as 4 -inch diameter pipe. Most of the
distribution mains are 6 to 10 inches in diameter. The
Water Distribution System 1,laster Plan (July 2006)
provides a comprehensive evaluation of existing and
projected system improvements. Tlic City maintains
a groundssater supply systern which is reserved for
standby or emergency situations, and to provide peal:
day demands that cannot be met through SC\X'A
tsater.
PetalumA hater consen-ation pprogram, established in
1993, has been and continues to be effectivc in promoting
permanent water savings. The program now accounts
for approximately 66 million gallons of potable Rater
savings each year, ptimarily through implementation
of the California \rater Urban Consenation Council's
Best Management Practices.
Atuld L&Na P aerm-ir.
8 -12
City of Petalrrn¢a Floodplain Management Plan
Goal 8 -G -7: Water Distribution
Continue to invest In the City's storage and
distribution system to Insure reliable delivery of
high quality water to meet daily and emergency
needs.
Policies and Programs:
8 -P -22 Invest in the maintenance, repair and
replacement of the water utility infrastructure.
A Fund pipeline infrastructure replacement
based on a 100 -year life cycle.
8 -P -23 Provide storage facilities to serve twice the
average daily water demand.
A Design and construct additional storage
facilities as necessary.
8 -P -24 Water quality shall be maintained to meet
local, State, and federal standards.
A Maintain water storage reservoir coatings on a
20 -year life cycle
B. Continue to perform routine directional water
main flushing and testing.
8-P-25 Work with SCWA to provide and improve
emergency measures to ensure adequate
water, storage and distribution during supply
interruptions.
8 -P -26 Encourage continued development of the
City's water supply and distribution system to,
meet established system pressure and fire flow
standards (including reservoirs, mains, and
hydrants).
A The Citywill Implement water distribution
Improvements identified in the Water
Distribution System Master Plan to provide
design pressure and flows to each part of the
City's water distribution system.
8 -P -27 Maintain existing and future water supply,
storage, treatment and distribution facilities
with minimal or no adverse impact to the
environment.
61
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 65
8.3 SIIRFACEWATER_ MANAGEMENT ____
INTRODUCTION — EXISTING CONDITIONS (2006)
'the Petaluma River watershed includes an area of
approximately 146 square miles. The City lies within
the watershed along the Petaluma River and is located
approxitnataly 12 miles north of San Pablo Bays The
City constitutes 13.6 square miles with approximately
16.1 square miles within the Cuban Growth Boundary.
'Ibe Citys surface water drainage system includes the
Petaluma River, Open creel- channels, conduits, culverts,
bridge openings, detention ponds, and controlstructures
su h as weirs. At locations tuoughout the Ciq', these
elements act to convey storm water runof coward the
Petaluma River and eventually to San Pablo Bay.
'The topography of the area also plays an important
role in surface drainage. The City is located in a broad
bowl, bounded by the Sonoma 1<founrains to the east
and a range of low hills to the west. 'the ground surlacc
elevation In the City varies from essentially sea level in
the area around the Petaluma River to approximately
400 feet above sea level in the hills within the City
limits.
CHARACTER OF SURFACE WATER DRAINAGE
SYSTEM
The hills that surround the City drain via numerous
creeks and streams that make their way through the
City on their way to the Petaluma River. Drainage
ways that convey these flows have been modified as
the area around the Petaluma River has developed. At
many locations K•ithin the City these creels and streams
have been converted to buried conduits. 'the addition
of impervious areas within the City has also changed
the local hydrology, RunolTconveyed over paved streets,
parting lots, and rooftops into open channels or pipes
that carry flows to the Petaluma River will reach the
River more quitUy, generally creating higher peak
flows titan runoff conveyed through natural streams or
through native vegetation.
Important characteristics to consider when analyzing a
surfacedrainagesystem include theclimaticconditions of
the local area; the most important climatic characteristic
is precipitation, which Venerates runolf.
Open /Natural Channels/ Biological Resources
Approximately 10.85 miles (57,300 linear feet) of
open channels and natural creeks exist within the City
City of Petaluma Floodplain Managentent Plan
Water Resources ?,t
of Petaluma. 11w Petaluma River spar rely consists
of a�iproximately 7.14 miles (37,700 feet) of channel
insit e the City limits. The riverbank composition
varies greatly as the River meanders through the City.
An inventory of this environment ivas undertaken in
2002 to include natural waterways, piped sections,
bioterhnical and bioengineered banks, riprap banks,
lloodwalls, and structures (sec Biological Resources
Review, TN13, GP EIRAppendix).
Preservation and enhancement of the natural channels
offers an excellent opportunity to improve the flood
conveyance capacity and enhante habitat -values.
Utilizing Utilizing and implementing the River Access and
Enhancement Plan (1986), setting aside the Petaluma
River Corridor, and utilizing the Restoration, Design
and Management Guidelines for maintenance activities
will ensure the protection of the natural environment
while meeting the flood flow capacity needs for the
Petaluma'Writershed Basin.
Existing physical and natural constraints may limit
the ability to achieve containment of the 100 -year
design storm within the Petaluma Rivet Corridor.
'Che intent is to maximize the carrying capacity of
the river corridor while reducing depths within the
surrounding floodplain to the greatest extent possible.
Implementation of the River Access and Enhancement
Plan establishes andlor enhances the river corridor
primarily through the introduction offlood cerraaccs and
low -flow channels, along with habitat restoration and
associated vegetation management. The Iood- terraces
and low -flaw channels are envisioned to be sized and
situated for compatibility with the existing topography
and describable landscape features, while still allowing
for future adjacent de elo went where appropriate.
Under the 1% (100 -year) design flow conditions, the
flood terraces are expected to vary in width up to 200'
from centerline in order to provide the desired beneficial
clTects on hydraulic capacity. noodwatcr elevation, and
water quality improvement.
Engineered /Piped System
"the City's piped storm water drainage system ranges in
size from less than 6 inches to greater than 6 feet in
diameter. A total ofapproximately4 ,480 pipe segments
exist in the City (2006). Of these pipe segments,
approximately 3,260 are less than 24 inches in diameter
and approximately 1,220 are 24 inches in diameter or
larger (a pipe segment is defined as any pipe originating
8.13
62 September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 66
Petaluma General Plan 2025
and terminating at a manhole, catch basin or open
channel), 'lliere are also approximately 70 locations
within die City where open channel (Iowa are conveyed
under roadways via bridges or culverts.
Flows I Capacity
Floods in the Petaluma River Basin are normally of
short duration, luting 3 to d days, or less. Tributaries
of the Petaluma River can begin to rise vtithin hours
after a heavy storm event has begun if antecedent soil
moisture content Is already high. Typically floods occur
between December and 14areh.
Flooding has taken place in the City, to the extent that
at least some street flooding occurs, nit average once per
year over the past twenty or so years. Recent significant
flooding events (me-aning street and property flooding)
have occurred in Petaluma in 1952, 1953, 1986, 1995,
1996, 1998, and 2005. 'Ihe largest flood of record in the
City of Petaluma occurred from January 3 through 5,
1982. A significant flood event occurred on December
30 -31, 2005, over - taxing both piped and open channel
systems.
Including the Petalurtia River, there art approximately
1S miles of channels that have been studied in decal( by
the Federal Emergency illanagemtnt Agency (FE11IA)
within the City. Based on the historic records of flood
events and the detail to which streams have been studied
and floodplains delineated within the City by FER4A, it
is clear that flooding is a significant problem.
The City has put forth significant effort to address
its flooding problems. L'videnee of this is the Civs
involvement in the National Flood Insurance
Program (NFIP) Community Rating System (CRS).
Community participation in the CRS Is voluntary.
7bere are 10 CRS classes based on a point system that
assigns a rating: Class 1 requires the most credit points
and gives the greatest premium reduction; Class 10
receives no premium reduction. A minimum of 500
points is required to receive a CRS classification of Class
9. A table describing activities and their point values is
included in Appendix D of this merihorandurn (FEidA,
1999). Petaluma is r„rrendy rated as Class 5.
'the City of Petaluma maintains a NWS Automated
Local Evaluation in Real Time (ALERT) emergency
flood warning system which provides reel -time water
ltvtl conditions for the Petaluma River and'- 'Willow
Brook Creek during flood events. The ALERT
system consists of nine precipitation gages distributed
8 -14
00, ofPetahana Floodplain Management Plan
throughout the -watershed and eight river stage gages.
Alarms are triggered If either the -water surface elevation
exceeds the set point or if the rate of rise excteeds the set
rate for apartieulugaging station location. Xiembersof
the Department of \Water Resources and Conservation
maintenance crews are paged when the trigger values
are reached.
Surface Water Modeling /Floodway Mapping
The City utilizes a surface w: -ter management model
(XP- SWNINI) as a tool to provide hydrologic and
hydraulic solutions for the Petaluma watershed. Future
use of the model will include evaluation of changes to
the watershed and conveyance system and the effects
of those changes, model or simulate modifications or
improvements to rest their effectiveness or Impacts,
project review, verification of applicant submitted
watershed impact reports, and prioritization of City
capital im t hcts, Tlic XP- SNVN4M model
will aso proumf jereraft
i g of the regulatory
Floodvmy and Floodplain through the Federal
Emergency hianagement Agency (FEUk), when
additional work is concluded to alloy the remapping
process to proceed. Until that rernapping occurs, the
1989 FEhIA Flood Insurance Rate A4aps (FIRR4s) will
remain as the City's regulatory means to delineate the
Floodway and Floodplain. `flitcreationof the Petaluma
River Corridor (PRC) within this General Plan provides
for designating the area of concern for preservation of
habitat and flood conve)romcc improvements.
Water Quality
'the (Jilted Starts Environmental Protection Agency's
(EPA) Clean Csacer 1ct regttlaces discharge from storm
drain systems In order to reduce surfact eater pollutants
and improve water quality. 'the Phase 11 National
Pollutant Discharge Elicnination System (NPDES)
rule, adopted by the EP.A and administered by the San
Francisco Bay Regional Vater Quality Control Board,
requires operators of small municipal stparate storm
smversystems to obtain aNPDES permit and implement
programs and activities to reduce pollutants in storm
water runoff, The City, of Petaluma, as an operator
of a municipal storm drain system prepared x Storm
'Water A4anagement Plan and began implementation
of this Plan in March 2003, in order to comply with
the Phase If NI'DLS requirements, `llic Plan acts as
the City =s permit, describing actions that include best
matiagementpractices, measurable goals, and timetables
for implementation six minimum control measures, as
63
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 67
follovn:
• Public Education and Outreach
• Public Participation/Involvement
• Illicit Discharge Detection and Elimination
• Construction Site Sturm Water Runoff Control
• Past - Construction Storttr Water IN anagement
• Pollution Prevention for Municipal Operations
Implementation of the Plan, as it relates to existing
and future land uses, including the development of a
dedicated funding mechanism, is necessary to ensure
water quality is protected and improved through the
planning period.
OPERATIONS & MAINTENANCE
Responsibility for maintenance of the open channels
within the City is shared between the City and SC%Y!A.
SCWA has also previouly been involved in planning
efforts and produced the Petaluma River Watershed
Master Drainage Plan, which was completed in 1956,
updated in 2003 and is still used today as a guide For
development of channel improvement projects within
the watershed.
The open channels within the City range from heavily
vegetated, asinthecaseofthePetalumaRivadow -nstream
of the Corona Road Bridge, to concrete lined channels,
as in the case of portions of East Washington Creel:.
Maintenance of these channels historically included
clearing vegetation from the bottom of the natural
channels by SCWA with heivy equipment to maintain
hydraulic capacity. SC%XrA discontinued that practice
In 1937 at the request of the California Department
of Fish and Game (DFG). As a result of this reduction
of in- channel maintenance %writ, hydraulic rapacity
his been reduced as the channels become choked with
vegetation and debris, thereby exacerbating flooding
problems. Tlie change in maintenance practices for
open channels has undoubtedly resulted in reductions in
the conveyance capacities of those chanttck, 1-here are
numerous locations where the amount of vegetation in
the main channel is u dense as that in the overbank areas.
As proposed development and habitat enhancement
projects continue, this change in character of the open
channels will need to be attdressed to ensure that the
current true hydraulic capacity of these conveyances
is taken into account for future planning, design and
implementation.
City of Petahana F7oodplain Management Plan
Water Resources
Current City of Petaluma standards for storm drainage
ace as follows:
• 10 -year storm - `fie entire area needs to drain into
I pipe.
• 25-year storm - Runofl'can pond in streets.
• 100 -year storm (FEMA BFE) - Needs to stay out of
habitable areas (finished floors must be above 100 -
year flood level). The 100 -year storm is 6 fiches of
rainfall in 24 hours.
• Designated areas (upstream of Pay ran Street bridge)
- Floors need to be 2 feet above 100 -year flood.
(Approach is similar to FENLA. requirements.)
• There is an option to provide detention siotage to
offset increased nmoff.
The City adopted a Storm Water Management Program
on March 3, 2003 as part of its application fir a National
Pollution Discharge Elimination System (NPDES)
Storm Vt mer Phase 11 Permit. The City:s applicatinn
Bras accepted by the San Francisco Bay Regional Dater
Quality Control Board; therefore the City now operates
under the Statewide General Stormw iter Permit.
The City also maintains Storm Drain Design and
Construction Standards and Specifications. These
include guidance for design and construction of
manholes, catch basins, sidewalk underdrains and other
items appurtenant to storm drainage systems. 'Ihe
Restoration Design and Aanagement Guidelines for
the Petaluma River Watershed is to provide reference
information, procedures and guidelines for the integrated
management and maintenance of stream corridors
and flood control ch;tnncls within the PCnrinma River
Watershed, 'Ilse goal of the document was to provide
a reference document for those involved in day -to-
day maintenance and management (Questa, 1996).
In Volume I, "Restotation and Revegetation Design",
vegetation, wildlife, acrd revegetation techniques within
the PetalumaVratershed are described and an assessment
and inventory of those resources is presented. Volume
II, "Ihlanagement for Stream Corridors", predominantly
concentrates on riparian vegetation including landscape
maintenance practices and strew ibank stabilization
guidelines.
Dredging. Currently; the USACE dredges the Petaluma
River from the head of the navigable waters located at
s•t s
64 September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 68
Petaluma General Plan 2025
1he'I'urning Basin In downtown Petaluma, on a four
year cycle, 'Ilse tonnage of cotntnercial products moved
on the River is the USACE method for determining
if dredging for navigation is economically justified.
Recreational use of the river, which is significant, is not
a part of the Corps economic justification criteria. In
the future, as propetn• values increase, some industries
may relocate away from the riverfront, thereby reducing
the annual commercial shipping tonnage. 'Without
industrial shipping there may not be enough justification
for continued navigation maintenance dredging on the
Petaluma River. If navigation channel maintenance
dredging were discontinued, this would negatively
impact the hydraulic capacity of 1110 new Payran flood
control project as sediment accumulates .without
periodic removal. 'file locations where dredging spoils
are placed on the shore require periodic maintenance
work to prevent erosion of the banks. Alternative
funding, through the creation ofanAssessment District,
should be pursued to guarantee dredging is performed,
in perpetuity.
CAPITAL IMPROVEMENT PROGRAM 1 RESTORATION
Sonoma County Zone 2--A. funds pay for some storm
water capital improvement projects within the City.
The Southern Sonoma County Resource Conservation
District, (RCD) the local component of the Natural
Resources Conservation Service of the U.S. Department
of Agriculture (USDA) also conducts small vatershed
restoration projects In the Petaluma watershed. 'Tilt
Petaluma Watershed Enhancement Plan is the guiding
document for RCD's activities within the watershed.
Completed in 1009 by the RCD, the enhancement plan
did not use the 1986 SCNZk muter plan as a starring
point, and is significantly different in nature. 'the
following four goals are identified in the enhancement
plan:
1. Goal A- Establish a local watershed council far
residents and other organizations to fund and
coordinate -watershed enhancement activities and
keep one another informed.
2. Goal B- Improve seater quality and groundwater
recharge in the Petaluma with the
ultimate purpose of removing the Petaluma River
from the R`.*v'QCB Impaired.vater body list 303d.
3. Goal C- Support the viability of agriculture in the
community.
8.16
City ofPetahana Floodplain Management Plan
Goal D- Conserve and enhance existing wildlife
habitat_
A Surface NMxter Operation and Maintenance Plan
(SWOMP) has been developed as a part of an overall
Surface Water Master Plan. 'the SNXIOMP describes the
requirements for personnel, equipment, materials and
other budget ecpenditure estimates necessary- to properly
maintain the surface water system (System) and meet
the requirements of the U.S. Environmental Protection
Agency Storm Walvr Phase If Final Ride. Bcncfits
beyond providing storal water conveyance systems will
also be gained from the City's SWOME Improvements
can be atpectedinoveralltvaterqualicy within the system
and to downstream areas. Proper design of stream
channels combined .with the improved maintenance
activities can also result in better protection of riparian
habitats, provide necessary facilities for preservation of
fish and other aquatic species, provide for recreational
and groundssater recharge opportunities.
See. Also Chapter 4: 'file Natural Environment for
discussion on the Petaluma River, natural environs and
preseradonlrestoration goals and policies.
Goal 8 -G -8: Surface Water Management
Provide surface drainage and flood protection
facilities to meetthe community's needs of reducing
flood hazards and potential property damage.
Policies and Programs:
8 -P -28 Thearea upstream of ilia Corps weir, and below
the confluence of Willow Brook Creekwith the
Petaluma River, located within the 1989 FEMA
floodplain (and any amendments thereto) and
adjacent to the Petaluma River, shall Include
a Petaluma River Corridor (PRC) set aside for
the design and construction of a flood terrace
system to allow the River to accommodate a
100 -year storm event within a modified River
channel, to the extent feasible given existing
physical and natural constraints.
A The Water Resources and Conservation
Department shall work with the Community
Development Department to Insure the PRC is
Implemented.
B. Maintenance, in perpetuity, of the PRC and
applicable flood terrace, storm water flow
capacity, environmental habitat and public
access Improvements shall be maintained,
65
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 69
through a funding mechanism approved by
the City.
8 -P -29 The City of Petaluma, SCWA, Sonoma County
and other responsible agencies shall be
encouraged to work together in orderto create
and adopt a flood management plan, or plan
amendment to the Petaluma River Watershed
Master Drainage Plan (SCWA, June 2003), for
the Petaluma River watershed implementing
the following regional surface water solutions,
or a reasonable segment thereof:
A. Establish a Petaluma River and creek corridor
setback for the design and construction of a
flood terrace system to allow the Petaluma
River (Corona and Denman Reaches), along
with Willow Brook, Marin, and Liberty Creeks
to accommodate a 1 % (100 -year) storm event
within a modified channel section to the
extent possible given existing natural and
physical constraints.
B. Work with Sonoma County to create interim
development standards for that setback area
until such time as studies are concluded and
approved by Sonoma County, the SCWA,
the City of Petaluma, and other responsible
agencies. Thereafter all lands affected shall
set aside the necessary river and/or creek
corridor areas and, as development occurs,
shall undertake the identified surface water
containment enhancement improvements to
accommodate improvements envisioned in
Program A. above. The.following components,
at a minimum, shall be Included in the Interim
development standards called for above:
• Compliance with No Net Fill.
• Elevation of finished floor at least two feet
above Base Flood Elevation (BFE).
• Construction of a flood terrace in the
setback area to convey the t % (100 -year)
design storm, to the extent possible,
in accordance with City and SCWA
requirements.
• Payment of an hydraulic/hydrology model
update fee for evaluating the proposed
project, the cumulative impacts and the
related mitigations, to the regional surface
water conveyance system.
• Payment of a proportionate share of
regional flood reduction mitigation costs.
C. The City will work with the County to ensure
that zero net fill policies are enforced within
City ofPetahnna Roodplain Management Plan
Water Resources'
the unincorporated area for areas within the
regulatory floodplain of the Petaluma River
and its tributaries.
D. Working with Sonoma County, the City
shall develop a plan and identify funding
opportunities to acquire and remove existing
structures within the regulatory floodway of
the Petaluma River and its tributaries. The
Plan shall be updated as needed to maintain
consistency with changes in regulatory
mapping of the floodway,
E. Participate with the County in implementation
of the regional components of the Petaluma
River Watershed Master Drainage Plan
(SCWA, June 2003), Petaluma River Floodplain
Management Plan (City of Petaluma, October
2001, Petaluma River Access and Enhancement
Plan (City of Petaluma, May 1006, Sonoma
County General Plan 2020 (Public Safety
Element) and the City of Petaluma General
Plan 2025.
8 -P -30 Within a 200' setback from centerline of the
Petaluma River, within the UGB, no additional
development shall be permitted on lands
within that 400' wide corridor, given natural
and physical constraints, unless the proposed
development fully complies with the Interim
development standards as defined in 8 -P -29 B,
until such time as the study referred to in Policy
8- P -29 -B is concluded and approved by the
SCWA and City of Petaluma. Thereafter all lands
affected shall set aside the necessary river and/
or creek corridor areas and, as development
occurs, shall undertake the identified
surface water containment enhancement
improvements.
A. The watershed model, XP -SWMM or updates
thereto, shall be maintained, in cooperation
between the City and SCWA, to assist in
the evaluation of development proposals
and in the design of regional watershed
improvements to reduce flood elevations.
B. Proposed development applications may be
charged a model update fee to cover costs
associated with evaluating a specific proposal
for project specific and cumulative impacts to
the regional surface water system.
C. On -site and off -site improvements, deemed
necessary by the City of Petaluma, to reduce
the surface water impacts associated with
a specific development proposal shall be
designed, constructed, and maintained in
perpetuity at the cost of the development
associated with said Impacts.
9 -17
66 September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 70
Petaluma General Plan 2025
B -P -31 In accordance with the studies undertaken for
the Corps Flood Protection Project, existing
areas subject to periodic surface water
inundation and containment, within the Corona
and Denman Reaches (Lynch Creek confluence
with the Petaluma River upstream to the Old
Redwood Highway over - crossing of Willow
Brook Creek), shall be preserved and enhanced
where feasible to reduce localized flooding.
A The Department of Water Resources and
Conservation shall work with the SCWA and
the Community Development Department
to insure the protection afforded by the
Payran Corps Flood Protection Project is not
compromised by proposed development.
B. Continue to work with SCWA for the on -going
efforts to maintain or improve historic channel
capacity for flood waters.
B -P -32 Areas within the Petaluma watershed,
outside of the City of Petaluma, which are
subject to periodic surface water inundation
and containment, should not be modified
In any manner to reduce the historic storage
characteristics and capacity.
A_ Department of Water Resources &
Conservation shall work with Sonoma County,
SCWA, and other responsible agencies to
preserve and expand detention basin capacity
within the Petaluma River watershed and
maintain or reduce peak discharge volumes
from billow Brook, Marin, Liberty and Lichau
Creeks.
B. The City shall work with the County of Sonoma
to establish a zero net fill policy for detention
basins and areaswithin the regulatory
floodplain within the Petaluma River
watershed in order to preserve and enhance
basin capacity and to ensure no detrimental
impact to downstream flows, including the
increase in peak discharge volumes in the
downstream areas.
B -P -33 The City shall continueto implement mandatory*
zero -net fill upstream of the Payran transition
weir, and when appropriate utilize zero -net
runoff, to assess site - specific Impacts and
Identification of mitigations.
A The Development Code shall be amended
to Include the dirt, existing or fill, between
the regulatory 100 -year flood elevation and
the required minimum elevation for the first
finished floor In the calculation of zero -net
8.18
City ofPetalmna Floodplain Management Plan
fill displacement or placement. Any project
within an area subject to inundation in a
1 % (100 -year) storm event shall include site
specific analysis of impacts and identification
of mitigations.
8 -P -34 Utilizing XP -SWMM, the City shall diligently
pursue the remapping and updating of the
regulatory Floodway and Floodplain, through
the Corps of Engineers.
Goal 8 -G -9: Surface Water Management:
Preserve the design conveyance capacity of the
surface water drainage system,
Policies and Programs:
8 -P -35 Protect private and public properties and
capital investments including those designed
to minimize flooding potential.
A. Work with SCWA, regulatory agencies, and/
or property owners, as appropriate given
maintenance authority, to insure maintenance
of the enaineered channels, natural creeks,
and enclosed surface water system.
B. Support continuation of Zone 2A parcel tax for
funding regional surface water improvements.
C. Work with regulatory and advisory agencies
to facilitate preservation and environmental
enhancement of the natural corridor for
species of importance and native to the area.
D_ Promote public education and stewardship of
the riparian corridors.
E. Work with the U.S. Army Corps of Engineers to
dredge the river channel downstream of the
transition weir to maintain the 100 -year design
conveyance capacity and navigable channel.
F. Initiate the formation of an Assessment
District, or other funding mechanism, to
ensure periodic dredging occurs and the
dredge materials disposal site is maintained.
G. The City shall continue to inspect and maintain
the conveyance capacity of open channels and
the piped system within our authority.
H. The City shall facilitate and advise property
owners to ensure the maintenance of privately
ovmed creeks and channels (e.g. Kelly
Creek). Assistance may include facilitation of
regulatory permitting and design standards.
I. Continue to evaluate, and take appropriate
action, to monitor and maintain the adequacy,
67
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 71
safety, and strength of existing berms and
levees and other flood proteaionireduction
facilities.
1. The Development Code shall require the
Identification of any disposal site for excavated
soil and require that any disposal be located
outside the regulatory floodplain within the
Planning Referral Area.
K Monitor changes in tide elevations and related
effects on Petaluma River tidal levels overtime
In order to determine if there Is a trend that
Increases the level of Mean Higher High Water,
as determined by the Corps of Engineer.
• Assess the effect of any such trend or
changes on habitable structures in the
regulatory floodplain.
L. Require flood protection of new or
significantly remodeled first floor habitable
structures within the regulatory floodplain,
M. Continue to monitor precipitation data in
order to maintain current data in the XP-
SWMM model.
N. Improve the data available for the XP-
SWM,M model. Add stream level gages at the
following locations:
• Petaluma River at Petaluma Blvd -
(southbound bridge)
• Petaluma River at the railroad trestle
bridge downstream of Corona Creek
• Corona Creek at McDowell Blvd.
• Capri Creek at McDowell Blvd.
• Adobe Creek at Lakeville Road
• Lynch Creek at Maria Dr.
• Lynch Creek at McDowell Blvd. or HWY 101
(northbound)
• Washington Creek at McDowell Blvd. or
HWY 101 (northbound)
• East Washington Creek at Washington St.
• Petaluma River at HWY 101 (southbound
bridge)
8 -P -36 Require development on sites greater than
1/4 acre in size to demonstrate no net increase
in peak day stormwater runoff, to the extent
deemed practical and feasible.
8 -P -37. No new inhabited structure or development
shall be permitted within that portion of
properties containing areas of water depths
exceeding one foot as illustrated in Figure 8-
011
Water Resources
2, unless mitigation and /or on -site or off-site
Improvements are constructed to reduce the
100 -year flood depth to less than one foot,
A. The City shall maintain a 2 -D model of the
Petaluma River within the City of Petaluma
and continue to work with SCWA to achieve a
2 -D model for the Petaluma Watershed.
B. Utilizing the 2 -D model, the City of Petaluma
will work with SCWA to identify, design, fund,
and construct regional solutions to minimize
the flooding impacts associated with historic
and increasing out -of -bank flows which occur
from increasing storm flow and velocity from
out -of -City areas into the City.
C. Working with Sonoma County, the City will
continue to ensure that zero net fill policies
are enforced within the unincorporated area
for areas encumbered by the regulatory
floodplain of the Petaluma River,
D. Utilizing an approved modeling tool, the
City shall diligently pursue the remapping
of the regulatory Floodway and Floodplain,
through the Corps of Engineers, following the
completion of the Payran Reach Corps project.
E. Working with Sonoma County, the City
shall develop a plan and identify funding
opportunities to acquire and move, relocate,
or demolish housing, which remain located
within the regulatory Floodway, once
remapping occurs.
F. Until remapping of the regulatory floodplain
occurs, new residential development in the
100 -year flood boundary area as illustrated in
Figure B -1, with depths of less than one foot
of water during a 100 -year storm event will be
required to elevate the lowest floor two feet
(2') above the BFE as determined by the City
2 -D model.
G. New non - residential development in the 100 -
year flood boundary area, identified in Figure
8 -1, with less than one foot of water depth
during a 100 -year storm event will be required
to provide flood protection at least 1 foot
above the BFE, or elevate the lowest floor two
feet above the BFE.
H. Residential development shall be prohibited
on the first floor of new structures within the
regulatory floodplain after remapping of the
FEMA floodway /floodplain.
I. After remapping the City should
pursue acquisition of properties in the
regulatory Floodway and seek funding
B-19
City ofPetahnua Floodplain Management Plan 68 September 21, 2015
Resolution No. 2015 -153 N.C.S.
Page 72
Petaluma General Plan 2025
for implementation of surface water
Improvements and riparian habitat
enhancements.
J. Consider development of a program whereby
projects may acquire property(ies) and
construct planned flood terracing and /or
detentiontretention facilities as mitigation
for surface water impacts. The result of the
Improvements must result in an improvement
to the pre-project conditions by way of a
net reduction in storm water elevations and
downstream flows.
Goal 8 -G -10: Water Quality
Reduce pollutant load in surface water runoff,
thereby improving water quality within the
Petaluma River and its tributaries.
Policies and Programs:
B -P -38 All development activities shall be constructed
and maintained in accordance with Phase
2 National Pollutant Discharge Elimination
System ( NPDES) permit requirements,
A_ The Water Resources and Conservation
Department shall review, and have the
authority to conditionally approve, all
development permits to insure compliance
with NPDES Phase 2 requirements.
B. Maintain, update as needed, and implement
the City's Storm Water Management Plan to
retain a current storm water discharge permit
with the California Regional Water Quality
Control Board.
C. A funding mechanism, such as a storm water
utility fee, shall be implemented by the
City to insure a dedicated source of funds is
available for all surface water drainage system
maintenance and Improvement needs.
Goal 8 -G -11: Sustainable Site Planning
Improve natural hydrologic functions and water
quality through sustainable site planning.
Policies and Programs:
B -P -34 Consider, to the extent practicable, requiring
sustainable site design practices as outlined
In the 'Sustainable Site Planning' text box
contained herein.
8.20
City ofPetaluina Floodplain Management Plan 69
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 73
(6)
Water Resources :,f;"
City ofPetabona Roodplain Management Plan 70
B-21
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 74
Petaluma General Plan 2025
Mit page iruendiunagy kft bk nk,
8.22
City of Petalama Moodplain Management Plan 71
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 75
Appendix B
City ofPetahnna Floodplain Management Plan 72
(S
The Natural Environment
Petaluma is a city defined by the natural environment.
The aquatic and riparian resources along the Peraluma
River; the rich, ecologically- diverse plant and wildlife
communities; the areas precious water and air resources;
and productive open space resources — contribute greatly
to the city's quality of life. Protection, restoration, and
enhancement of the natural environment are intrinsic
components of fostering sustainability:
71tis element outlines policies related to the river,
biological resources, air quality; energy, and solid waste.
Detailed background information about the natural
environment in Petaluma is Provided In the Biological
Resources Review (Appendix F -3, Volume 4 of Technical
Appendices).
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 76
Petaluma General Plan 2025
4.1 BIOLOGY AND NATURAL
THE RIVER ENVIRONS
'I}te significance of the Petaluma River lies in its roles as
a natural habitat, a carrier of storm waters, a centerpiece
of urban identity and local history; a recreation
resource, as well as a water -borne commerialAndustrial
transportation corridor. Today; the river is navigable
From its mouth at San Pablo Bay to the Turning Basin in
downtown Petaluma.
The river is also part of an ecological system that runs
from the hills to the San Pablo Bay; linking Fresh water
with tidal zones. Urban development, however, has
caused the degradation of the most significant natural
resources Within the Urban Growth Boundary (UGB)-
the aquatic and riparian resources Found along the river
and its tributaries. Conserving and restoring the river's
ecological system is essential to maintaining Petalumas
place -based character.
Aquatic and Riparian Resources
Aquatic resources in the Planning Area include the
Petaluma River and its tributaries, vernal pools and
seasonal tsedands, northern coastal salt marshes, coastal
brackish marshes, and fresinvater marshes. Riparian
habitats are found in provmity to these aquatic areas,
and act as a transition from the upland communities,
providing habitat and cower for many species of aquatic
and semi - aquatic animals. 'lhc General Man seeks to
protect these aquatic and riparian habitats as they play
a crucial role in the preservation of sensitive species In
the area, including the Chinook salmon and the'Wrestem
Pond Turtle.
Petaluma River Access and Enhancement Plan
As mentioned is Chapter 1: Introduction, the 1996
Pctaluma River Access and Enhancement Plan (the
River Plan) describes the community's vision for the
Petaluma River, including riverfront uses, activities,
and developments. A central feature of the River Plan
is the integration of the natural and built environment,
recognizing that development and public access along
the river must be balanced with protection of the fevv
remaining natural areas located along this corridor.
Equal in priority are the goals and polities of the Surface
Mater portion of the \Xtater Resources Element, which
identifies the need to preserve an adequate setback from
the river to accommodate peak storm flows.
Incremental implementation of the River Plan has been
underway since it was completed and this General Plan
enhances its status as an integral part of the General
Plan implementation. Since 1996, trail segments have
been Installed, land has been purchased as riv-erfront
open space, flood reduction, habitat enhancement, and
restoration projects have been completed. Design of new
pedestrian improvements continues to be planned and
constructed, riverf-ont properties have been developed,
and funding for additional projects continues, 'Ihe
General Plan incorporates the River Plan as a proven
c&ctive too[ for use by the City and property owners
all in achieving the goals set forth by the community.
VEGETATION
'WThile the river environs contain areas of tremendous
plant and Wildlife diversity; there are other parts of
the Planning Area that exhibit unique and valuable
biological characteristics. A brief description of the
Planning Areas common vegetation communities is
provided below, followed by an identification of sensitive
species and habitats that warrant additional protection
and management strategies to preserve their features.
Vegetation types within the Planning Area —as described
in Holland's Preliminary Descriptions of Terrestrial
Natural Communities of California —may generally be
classified into eight categories:
1. Urb�za. Inrludes ornamental landscaping, non - native
The Petaluma Rirrr, rht rityi largrtr tvateru ay: nteandm through the rower ofthe dry.
e -2
City ofPetaluina Floadplain ManagernentPlan
73 September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 77
grass and weed associations in vacant lots (usually
referred to as ruderal vegetation), and scattered
agricultural crop and orchard plantings.
2. 1ueralagrietthural. Includes low- density residentiall
commercial area, as well as row crops, orchards, and
ruderal vegetation. Avariery oFagricultural products
are grown in the Planning Area, Including tomatoes,
asparagus, corn, squash, Ivalmns, apticots, apples,
cherries, and grapes.
3. Grmstand/oak ravartttaA. Non - native grassland veg-
etation occurs in the western athd southern portions
of the Planning Area while oak savannah occurs In
the western portions - In many areas, severe levels of
grazing have reduced these plant coverings to the ex-
tent that bare ground is visible.
4. Frrth emergent wrAindr. 'These wetlands are among
the most productive wildlife habitats In California.
Fresh emergent wedand habitau occur in association
with terrestrial habitats or aquatic habitats including
Riverine, Lacustrine, and Wret Meadows.
5. Ycntal pooltAnvonal wrAintit. These temporary
ponds create a unique microclimate, which sup-
ports an assemblage of plants and wildlife. t'ernal
pools In the Planning Area are associated with the
grassland and oak savannah communities. The
California Department of Fish and Game (CDFG
classifies vernal pools and seasonal wetlands as a
sensitive habitat.
G. Riparian. 'the Planning Area contains bands of
riparian habitat along the Petaluma River and
its tributaries.
The Natural Environment I
7 Arortlmrn reajtal salt ntartb. These wolands contain
highly productive, herbaceous perennial plants up
to 4 feet in Iheight. The salt marsh wetlands located
in the lower reaches of the Petaluma River are im-
portartt habitat For seruitive species such as the salt
marsh harvest mouse, California clapper rail, and
California black rail.
Brackish awer nrarib. Found adjacent to coastal salt
marshes, these marshes differ in that they are made
black sh from freshwater input. Species composition
is characterized as being intermediate between
salt marsh Avetand and freshwater marsh wedand
communities, consisting of elements from both
communities.Asaresult, thebraddsh marshwetlands
are located in the lower reaches of the Petaluma River
and are important habitat For sensitive species also
found in the coastal salt marshes.
SENSITIVE SPECIES AND HABITATS
Sensitise or special status species are those plane and
animal species that are designated by Federal or State
regulatory agencies as needing protection due to rarity
or threats to their existence. Sensitise habitau are those
areas in which plant or animal life or their habitats are
either rare or especially valuable because of their special
nature or role in the ecosystem. Sensitive habitat areas
within the Planning Area include vernal pools, northern
coastal salt marshes, and coastal brackish marshes.
Special status species that have moderate to known
occurrence within the Petaluma Planning Area are
listed in Table 3.8 -1 of the Final Environmental Impact
Report
Petaltunas chic, earls, and niart1w offer a Ame biek#rdl and Optrmseearrw Ake Sk A.6ertrP&rkareevi ;aorrentesmp+munrof
e vAft f tisbi stfv. cur sects eateitt Peml+ms! rse:rral erebarw.mt
000 of PetalumaFloodplainManagementP last
4 -3
74 September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 78
Petaluma General Plan 2025
GOAL 4 -Ga -1t Biology & Natural Resources
Protect and enhance biological and natural resources
within the UGB.
Policies and Programs: __. _____ _
4 -P -1 Protect and enhance the Petaluma River
and Its tributaries through a comprehensive
river management strategy of the following
programs:
A Fully adopt and incorporate the Goals,
Objectives, Policies and Programs of the
Petaluma River Access and Enhancement
Plan as an integral part of the General Plan
2025. Implement the Petaluma River Access
and Enhancement Plan including expanded
Improvements identified through project
specific environmental assessment.
B. Institute and maintain public access to and
along the entire length (on one or both
sides), of the river while ensuring that natural
resources and river dependent industry are
protected.
C. Require design review to address the
relationship and stewardship of that project to
the river or creek for any development on sites
with frontage along the river and creeks.
D. Create setbacks for all tributaries to the
Petaluma River extending a minimum of 50
feet outward from the top of each bank,
with extended buffers where significant
habitat areas, vernal pools, or wetlands
exist. Development shall not occurwithin
this setback, except as part of greemvay
enhancement (for example, trails and
bikeways). Where there is degradation within
the zone, restoration of the natural creek
channels and riparian vegetation is mandatory
attime of adjacent development-
E. Facilitate compliance with Phase 11 standards of
the National Pollutant Discharge Elimination
System (NPDES) to improve the water quality
and aesthetics of the river and creeks.
F. Work with the State Lands Commission, State
Department of Fish and Game, the Sonoma
County Water Agency, and other jurisdictional
agencies on preservatiordenhancement of the
Petaluma River as a component of reviewing
major development along the River.
G. Expand the planting and retention of trees
along the upper banks of the river and creeks
to reduce ambient water temperature and
shade out invasive, non - native species.
4-4
City of Petahana Floodplain Management Plan
75
H. Revise the Development Code to include:
• Standards for the four management zones
that run the entire length of the river:
1) Restoration Zone, 2) Buffer Zone, 3)
Preservation Zone, and 4) River Oriented
Development Zone. These standards shall be
based on the River Plan's text and sections
A- Athrough O -O as augmented by the
cross - section needs identified through the
XP -SWMM analyses;
• Design review requirements as articulated in
the River Plan for any development on sites
with frontage along the river or within 300
ft. of the river,
• The use of transfer of development rights
(TDR) from portions adjacent to the river
to elsewhere on the parcel by allowing
property owners an Increase In residential
densities or in allowable Floor- to -Area-
Ratio (FAR) and/or smallerlclustered lots to
compensate for the loss of development
opportunity on land within the Restoration,
Buffer, or Preservation zones of the River
Plan. The overall development potential
on a site shall be consistent with the
General Plan. TDRs shall not be applied to
lands within the Floodway as there Is no
development potential within the Floodway.
I. Develop a consistent design for site furniture,
a wayfinding system, and educational signage
in the PRC and along the creeks and tributaries
leading to itto heighten the recognition and
value of the river and its ecosystem.
J. Utilize the Parks and Recreation, Water
Resources & Conservation, Public Works
departments, property owners (e.g. Landscape
Assessment Districts) and/or other appropriate
public agencies (e.g. Sonoma County Water
Agency) to manage the long term operations,
maintenance responsibilities, and stormwater
capacity associated with the river and tributary
greemvays.
K Prohibit placement of impervious surfaces in
the Floodway (i.e. Parking lots, roadways, etc.)
with the exception of pathways and emergency
access improvements.
L. Continue to implement, where appropriate,
flood terrace improvements to reduce localized
flooding in concert with habitat enhancement
projects.
M. Cooperate with State and Federal agencies
to address and/or eradicate Issues and
environmental problems associated with
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 79
possible Infestation of the midden crab into the
Petaluma River and adjacent tributaries.
4 -P -2 Conserve wildlife ecosystems and sensitive
habitat areas in the following order of protection
preference: 1) avoidance, 2) on -site mitigation,
and 3) off -site mitigation.
A. Utilize Technical Memorandum 3: Biological
Resources Review as a baseline document,
expanding to address project specific impacts.
The Natural Environment
critical biological habitats as well alto reduce
cumulative impacts on sensitive watershed
areas outside of the city limits.
B. Work with County, State and federal agencies
to ensure that development within the
Planning Referral Area does not substantially
affect State or federally listed rare• endangered,
or threatened species or their habitats. Require
assessments of biological resources prior to
approval of any development in or within 300
feet of ecologically sensitive areas.
4 -P -3 Protect special status species and supporting 4 -P -5 Support wetland mitigation and oakwoodlands
habitats within Petaluma, including species restoration In the unincorporated areas outside
that are State or Federal listed as endangered, the UGB.
threatened, or rare.
A. As part of the development review process,
site- specific biological resource assessments
may be required to consider the impacts
on riparian and aquatic resources and the
habitats they provide for Invertebrates, fish,
amphibians, reptiles, birds, mammals, and
plants. If development is located outside these
ecologically sensitive regions, no site- specific
assessment of biological resources may be
necessary. Appropriate mitigation measures
to reduce impacts to sensitive habitats and
special status species shall be imposed on a
project-by- project basis according to Petaluma's
environmental review process.
S. Permit mitigation banking as a conditional use
In all land use designations along the Petaluma
River and Its tributaries.
GOAL 4 -G -2: Biology & Natural Resources
Promote resource protection within the Petaluma
Watershed to conserve grassland habitats, oak
woodlands, and other natural resources that are
found in areas between the UGB and the Planning
Area boundary,
Policies and Programs:
See also Chapter 8., Water Resources.
4 -P -4 Continue to support rural land use designations
and Agricultural Best Management Practices
within the Sonoma County General Plan.
A. Coordinate with Sonoma Countyrs Agricultural
Preservation and Open Space District, Permit
and Resource Management Department, and
Water Agency to protect riparian corridors and
City ofPetahona Floodplain Management Plan
76
4.2 AIR OUALiTY
In addition to being a regional issue of significance, air
quality, is -vital to the overall health of the environment
and the attractiveness or any locality. 'jlie Petaluma
Valley enjoys generally good air quality largely due to its
link with the Petaluma Gap (the region From the Estero
Lowlands to the San Pablo Bay) and its low population
density:
Mobile sources, including trains, boats, planes, and
wt -:cad oil -tond vebicies, present dte greatest threat to
air quality in Petaluma, as well as the region. Highway
101 and Iry interchanges are the most significant cause
of elevated ozone 1�vels in the area. \4rood burning and
otter outdoor burning during late Fall and winter is
another source of air pollutants (primarily particulates
and carbon monoxide). However, the prevailing wind
assists in providing Petaluma with good air quality- as
there are no significant pollution sources upwind or
Petaluma, and pollutant loads tend to be carried to the
southeast away from the most developed areas., w1file
air pollution potential is loav, Petalurn2!s role in the
cumulative regional air quality must be addressed.
SAN FRANCISCO BAYAREAAIR BASIN
'11te City of Petaluma is located within the nine - county
San Francisco Bay Area Air Basin. The air quality within
the Bay Area Air Basin is Influenced by a wide range of
emissions sources —such as dense population centers,
heavy vehicular traffic, and industry.
Under the Federal Clean AirAct, the U.S. Environmental
,- Cir�oFPenluxra, Deputtn !r.:oEComm�irDtielopm:n:,Rl��a
Oak+iPt:xlwna tlea'r. Vi1Lgt linter Plan Drat. Envirenme�teal
Iraid!Repa.6 hL^h 1990.
Resolution No. 2015 -153 N.C.S.
4•S
September 21, 2015
Page 80
Petaluma General Plan 2025
Protection Agency (EPA) can clasitft• an air basin or a
portion thereof, is either in "attainment" or "non -at-
tainnhent. `'This classification is based on whether or not
the basin meets national ambient air quality swulzrds.
Likewise, a basin is classified under the California Clean
Air Act with respect to the achievement of State ambi-
ent air quality standards. 71he Bay Area is considered in
"attainment" for all of the national standards. It is con-
sidered in "non attainment" for State standards for ozone
and suspended particulate matter (Pi\4 -10 and PM 2.5,
but is "unclassifiable" with regard to visibility - reducing
particlesz).
CRITERIAAIR POLLUTANTS
Federal, State, and local laws and regulations are the
basis for controlling air pollution. 'the federal Clean Air
Act requires the EPA to identify National. Ambient Air
Quality Srtndards, The EPA has established national
standards for six criteria air pollutants, including ozone
(03), carbon monoxide (CO), nitrogen dioxide (I\T02),
sulfur dioxide (SO2), suspended particulate matter, and
lead (Pb). In addition, the California Clean Air Act sets
Stare standards for ambient air quality that are more
stringent than the corresponding national standards.
This legislation also sets standards for sulfates, hydrogen
stdfide, and vinyl chloride, pollutants for which no
national standards have been set.
At the regional and local levels, the Bay Area Air
Quality Management District (BAAQ14lD) is primarily
responsible far planning, implementing, and enforcing
the federal and State ambient standards in the Bay
Area, 1be BAAQMD operates a nearby air quality
monitoring station in Downtown. Santa Rosa at 5°
Street, approximately 15 miles north of Petaluma
According to station measurements, no violations of
federal or state standards for carbon monoxide occurred
From 1996 -2004 in the area, and ozone levels exceeded
the State standard only twice. Occasional violations of
particulate matter standards are a result of combustion,
construction, grading, demolition, agricultural activIties,
and motor vehicles; however, the number of days when
violations occurred is significantly lower than in previous
Yeats, especially the 1980s.
TOXIC AIR CONTAMINANTS
Unlike criteria air pollutants, ambient air quality standards
have not been established for toxic air contaminants
(TACs). These pollutants are typically carcinogens,
� h:tp: the <.�rsL.rs.go-idesi�tsdrnt :d,xh�n
a5
City ofPetahuna Floodplain Lnagement Plan
77
rnutagens, or reproductive toxins. Regulation of toxic
air mntirrAnints is achieved through federal and State
controls on Individual sources?
"Ilse preferred technique (or reducing toxic air emissions
is source reduction, and as part of a local control strategy
in the Bay Area, all applications for new stationary
sources are reviewed to ensure compliance with required
emission controls and limits. BAAQMD maintains an
inventory of stationary sources of toxic air wntantinants
that emit TACs above certain threshold quantities in
the Bay Area.' icrc are currently I I such Sources listed
within Petaluma, six of which are dry cleaners.
Hazardous Air Pollutants (FIAPs) are emitted by any
sourer that burns fitcl (other than hydrogen), Then are a
wide variety of Federal and State controls on TACs and
HAPs that apply to mobile and stationary sources.
Sensitive Receptors
'Ttr BAAQMD defiers scnsit ivc receptors as "facilities or
land uses that include members of the population that
are particularly sensitive to the effects of air pollutants,
such as children, tiro elderly and people with illnesses.
Examples include schools, hospitals and residential
areas.. " HeIghtened sensitivity may be caused by health
problems; proximity to the emissions source, and duration
Of exposure to air pollutants. Sensitive receptors in
Petaluma include approximately 20 elementary schools,
two junior high schools, seven high schools, one hospital
and several convalescent homes. Any residence can also
be considered a sensitive receptor.
Recognizing those seruitive members of the community
are also likely to be at parks and in or around any
residential area, 211 residential structures could also be
deemed sensitive.
: Ftdtnl trn ironratraJ tmss refer to "ter rdous air pollutants' and
Celif rnia ervuonm=rl 11-t I&I to ixfe aL tontami,sanuf
c Bay Area Air Qushrj 1i:nageraeat Dittris, BafAru'97 CltanAir
rise ar.dTtiwnialAssstment, Dw=bas 17, 1997.
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 81
GOAL 4 -G -3: Air Quality
Improve air quality and meet all Federal and State
ambient air quality standards and goals by reducing
the generation of air pollutants from stationary and
mobile sources.
Policies and Programs:__________
4 -P -6 Improve air quality through required planting
of trees along streets and within park and
urban separators, and retaining tree and plant
resources along the river and creek corridors,
A. Require planting of trees for every significant
tree removed at a project site. Replacement
planting may occur on the project site or
on a publicly owned area, with long -term
maintenance assured.
• Encourage the use of trees which provide
biogenic benefits to air quality and are
suitable to the local environment.
• Establish ratio and size of replacement trees
as part of the development code update.
4 -P -7 Reduce motor vehicle related air pollution,
A. Enforce land use and transportation strategies
described in Chapter 1: Land Use and Chapter
5: Mobility that promote use of alternatives to
the automobile for transportation, including
walking, bicycling, bus transit, and carpooling.
Motor vehicles, regulations of whose emissions
bylocal agencies Is preempted by State law,
are the majorsource otcrlterla airpollutants
In the Bay Area Air Basin, accounting for
the vast majority of carbon monoxide and
particulate matterand over a quarterof the
reactive oxygen gas and nitrogen dioxide in the
region. increased use of transit and carpooling,
coupled with land use and circulation patterns
thatpromote vialking and bicycling, can lead
to a decrease in daily trips, less emissions, and
Improved air quality.
4 -13-8 Support, where feasible, the development of
alternative fuel stations,
4 -P -9 Require a percentage of parking spaces in large
parking lots or garages to provide electrical
vehicle charging facilities,
4 -P -10 Require electric vehicle charging and alternative
fuel facilities at all new and remodeled gas
stations,
City ofPetah nta Floodplain Management Plan 78
The Natural Enviranment
llighwa) 1171 and in iuterdnings are rbe nmsr signifrrmt rawer of
elt .0 l dwee Itt'dl !r1 tit _2[
4 -P -11 Promote ride - sharing and car - sharing programs.
4 -P -12 Prohibit new drive -thru food and service
facilities with the exception of vehicle serving
businesses, such as car wash and oil /lube, and
limit expansion of the drive -thru components of
existing facilities which increase idling vehicles.
• Discretionary approvals for such facilities
shall include provisions which decrease
or eliminate Idling vehicles, to the extent
feasible and practical.
4 -P -13 Require development of traffic roundabouts,
where feasible, as an alternative to a traffic
signal, to reduce idling vehicles.
4 -P•14 Develop and integrate IntelligentTransportation
Technologies, as applicable, into Petaluma's
transportation system.
4 -P -15 Improve air quality by reducing emissions from
stationary point sources of air pollution (e.g.
equipment atcommercial and industrial facilities)
and stationary area sources (e.g. wood - burning
fireplaces & gas powered lawn mowers) which
cumulatively emit large quantities of emissions.
A. Continue to work with the Bay Area Air Quality
Management District to achieve emissions
reductions for non attainment pollutants;
including carbon monoxide, ozone, and PM-
10, by implementation of air pollution control
measures as required by State and federal
4 -7
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 82
Petaluma General Plan 2025
statutes.
The BAAQMD's CEQA Guidelines should be used
as the foundation for the Clays reviewof air
quality Impacts under CEQA.
B. Continue to use Petaluma's development review
process and the California Environmental
Quality Act (CEQA) regulations to evaluate and
mitigate the local and cumulative effects of
new development on air quality.
C. Continue to require development projects
to abide by the standard construction dust
abatement measures included in OAAQMD's
CEQA Guidelines.
These measures would reduce exhaust and
particulate emissions from construction and
grading activities.
D. Reduce emissions from residential and
commercial uses by requiring the following,
• use of high efficiency heating and other
appliances, such as cooking equipment,
refrigerators, and furnaces, and low
NOxvrater heaters in new and existing
residential units;
• Compliance with or exceed requirements
of CCR True 24 for new residential and
commercial buildings;
• Incorporation of passive solar building
design and landscaping conducive to passive
solar energy use for both residential and
commercial uses, i.e., building orientation
in a south to southeast direction, encourage
planting of deciduous trees on west sides
of structures, landscaping with drought
resistant species, and use of groundcovers
rather than pavement to reduce heat
reflection;
• Encourage the use of battery - powered,
electric, or other similar equipment that
does not impact local air quality for non-
residential maintenance activities;
• Provide natural gas hookups to fireplaces or
require residential use of EPA - certified wood
stoves, pellet stoves, or fireplace inserts.
Current building code standards generally
ban the installation of open - hearth, wood -
burning fireplaces and wood stoves in new
construction. It does, however, alloy for
the use of low -pol luting imood stoves and
inserts in fireplaces approved by the federal
Environmental Protection Agenof as well as
fireplaces fueled by natural gas.
4-a
City ofPetahona Floodplain Management Plan
wit
4-P -16 To reduce combustion emissions during
construction and demolition phases, the con-
tractor of future individual projects shall
encouragethe inclusion in construction contracts
of the following requirements or measures
shown to be equally effective:
• Maintain construction equipment engines
in good condition and in proper tune
per manufacturer's specification for the
duration of construction;
• Minimize idling time of construction -
related equipment, Including heavy -duty
equipment, motor vehicles, and portable
equipment;
• Use alternative fuel construction equipment
(Le., compressed natural gas, liquid
petroleum gas, and unleaded gasoline);
• Use add -on control devices such as diesel
oxidation catalysts or particulate filters;
• Use diesel equipment that meets the AR8's
2000 or newer certification standard for off -
road heavy -duty diesel engines;
• Phase construction of the project;
• Limitthe hours of operation of heavy duty
equipment
4-P -17 To avoid potential health effects and citizen
complaints that may be caused by sources of
odors, dust from agricultural uses, or toxic air
contaminants the following measures may be
considered:
Locate new stationary sources of air
pollutants, such as industrial facilities, at
sufficient distances away from residential
areas and facilities that serve sensitive
receptors to avoid significant Impacts caused
by odors, dust, and toxic air contaminants.
Include buffer zones within new residential
and sensitive receptor site plans to separate
those uses from potential sources of odors,
dust front agricultural uses, and stationary
sources of toxic air contaminants.
4.3 ENERGY
Like almost every community in California, Petaluma
uses electricity, natural gas, and petroleum -based fuels as
its primary sources gfenergy. In California, approximately
54 percent of the State's entire energy supply- is made
up of petroleum -based fuels. Natural gas tnakrs upp 33
percent of the energy supply, and 13 percent Cordes from
electricity: Petroleum -based fuels, or transportation fuels,
Resolution No. 2015 -153 N.C.S.
September 21, 2015
Page 83
and natural gas are considered primary sources because
they are readily available.
Reduced energy use in housing, commercial structures,
public facilities, and transportation helps maintain
local economic vitality and reduces the need for new
infrastructure to deliver energy to the city. `The energy
shortages faced by the State and the threatened rolling
blackouts in the: summer of 2001 as well as the high
gasoline prices in summer 2005, underscore the
itnportance of conserving energy resources. Better use of
materials, insulation, and increased harnessing of solar
incidence in building design reduces demand on natural
gas and heating products. Transportation measures that
facilitate pedestrian use and bicycling reduce dependence
on petro leum. Together, these steps stiill lead to a more
reliable, sustainable, economic energy future.
GOAL 4 -G -4: Energy
Reduce reliance on non- renewable energy sources
In existing and new development.
Policies and Programs:
Energy policies supporting alternative and efficient
transportation systems, reduction of energy consumption
In buildings by means of appropriate design and
orientation are identified in Section 3.3: Sustainable
Building and Chapter S_ Mobility Residential energy
eff dency is addressed in Chapter 11: Housing Element.
4 -P -18 Develop and adopt local energy standards
that would result in less energy consumption
than standards set by the California Energy
Commissions (CEC) Title 24 or updates thereto.
The State of California addresses energy
conservation through Title 24 "Energy Efficiency
Standards for Residential and Nonresidential
Buildings-" Whereas Title 24 applies to new
buildings, much of the City west of Highway
101 was developed prior to 1933 and there
is a tremendous opportunity to encourage
greater energy efficiency it) Petaluma's older
structures, Energy- efAcient air conditioners,
high - efficiency lighting and glass, automatic
controls for lighting, photocell dimming, higher
insulation levels, and reflective rooftops are
examples of standards that could reduce energy
consumption in new and existing buildings.
A. Identify and implement energy conservation
measures that are appropriate for public
buildings and facilities, such as:
City ofPetaluma Floodplain Management Plan
80
The Natural Environment A
• schedule energy efficiency "tune-ups" of
existing buildings and facilities.
• Institute a lights - out -at -night policy in all
public buildings where feasible_
Continue to retrofit older lighting fixtures
in City facilities until all buildings have been
upgraded.
Where new traffic signals or crosswalk
signals are installed, or existing signals are
upgraded, continue to use LED bulbs or
other equivalent efficient technology that
may develop.
Evaluate the possibility of decreasing the
average dailytime streets lights are on.
Periodically evaluate the efficiency of
potable and sewer pumping facilities and
identify measures to Improve pumping
efficiency.
• Encourage the County of Sonoma to
upgrade existing, inefficient facilities which
serve Petaluma (e.g. potable water pumping
facilities).
B. identify energy conservation measures
appropriate for retrofitting existing structures.
Work with local energy utility to encourage
incentive program for retrofitting. Consider
the use of alternative transportation fuels
among City -owned vehicles and the Petaluma
Transit system to reduce dependence on
petroleum -based fuels and improve local air
quality. Continue to replace traditional fuel
vehicles In the City's fleet with alternative fuel
vehicles and/or zeroAav emission vehicles, as
appropriate. When selecting alternative fuel
vehicles consider the "full cycle" of emissions
for the different fuel types.
In 2002, the City of Petaluma adopted a Clean
City Fleets resolution. The Clean Fleets Program,
sponsored by the American Lung Association,
directs local govemmentstaff to purchase the
cleanest vehicle available for municipal fleets.
C. Investigate and implement alternative sources
of renewable power to supply City facilities,
such as solar water heating at the Petaluma
Swim Center, cogeneration at the Ellis Creek
Water Recycling Facility, and solar photovoltaics
on City -owned buildings.
4 -P -19 Encourage use and development of renewable
or nontraditional sources of energy.
A. Participate in state and local efforts to develop
appropriate policies and review procedures
for the institution of renewable energy
Resolution No. 2015 -153 N.C.S.
4 -4
September 21, 2015
Page 84
Petaluma General Plan 2025
sources such as solar, wind, geothemlal, and
hydroelectric pourer.
One such effort began in August 2005, when
the City adopted a resolution requiring
developers of residential projects of 5 or more
units to wire all units for future photo voltaic
arrays.
In addition, the States Emerging Renetvabtes
Buydown Program provides rebates to
consumers who install qualifying energy
systems, such as photo voltai4 vdnd turbines
and fuel cells. As ofJuiy2005, neariy80
participants from within Petaluma have been
involved with the program through the use of
solar energy systems.
8. Implement green building code to allow use of
alternative building materials and methods.
C Work with the Petaluma Area Chamber of
Commerce and PG &E in encouraging local
businesses to undertake energy audits and
implement energy reduction improvements.
D. Consider the feasibility of requiring a
percentage of new development to meet
50% of their energy needs from fossil fuel
alternatives (e.g. solar panels, etc.).
4•P-20 Continue to participate in undergrounding of
public utility lines,wheneverappropriate, require
conversion of overhead lines to underground in
conjunction with public and private projects.
4.4 SOLID WASTE
Solid waste transfer and disposal facilities are owned
and operated by the Sonoma County Department of
Transportation and Public R7orls, which also helps
maintain the CouratywideInteg.ated'WasteManagement
Plan (CoMMP) joindyvvith It Sonoma County Waste
Manzgement Agency (SCVri1L1).
At this time, the County owns and operates one landfill
and owns and contracts the operation of five transfer
stations that provide service to its re- silents. "Ihe Central
Landfill, lnc:awd within the Central Disposal Site, and
the Sonoma Transfer station service Petaluma. In 2001,
the Central landfill was expanded to provide sufficient
capacity for solid waste disposal through 2015. 'Ihere
is, however, the possibility of expanding the facility-
and postponing its closure further into the future. An
analysis done by Sonoma County recommends slim
a new landfill in the County once the Central Landfill
G -10
City ofPetahtma Floodplain Management Plan
81
has reached capzcity. Ira 2001, Petaluma disposed
approximately 56,000 tons of solid waste at this site,
representing ;bout 11 percent of the total -waste disposed
at the Central Landfill.
As of January 2006, the private hauler Green R?ute
Recovery is responsible for the 60 solid waste pickup
and disposal. Under various options for tnutt disposal,
Petalumas waste could go to landfills in Novato, I lollisteq
Suisun City, or Dixon.
',1�t1'Li�I�C
'the Integrated Waste Management Act requires local
governments to prepare and implement plans to achieve
50 percent waste reduction in 2000. Sonoma County
and Individual city recycling and composting programs
resulted in a 40 percent diversion rate for the County,
IS n whole in 2000, 'tire 50 percent diversion goal has
been extended for the County and a 70 percent goal
for 2015 has already been approved by the SCWMA.
The County's Source Reduction and Recycling Element
(SRRE) documents how source reduction, recycling,
composting, and public education will contribute to the
diversion of solid wastes from landfills.
Petaluma has two drop•off /buyback centers, two 20/20
buyback centers, single - family residential curbside
recycling, as well as commercial rceveling. The curbside
recycling program, operated under Green -W'ute, provides
I single - stream bin system- In addition, yard waste
collection services are provided on a weekly basis.
71x South I'rtalurnn Rrryrlint Center, located on Petaluou Roulrnvrd
South, ofen fyee dmpajjtrn fu jar mw rnyda6Ls.
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 85
Petaluma contributed 8,681 tons of recyclable waste (13
percent of the County= 64,596 tons) and 18,846 tons of
composting waste (16 percent of the countys 115,000
tons) In 2000. -Tine ciry's percentage of participation in
County recycling slightly outweighed its proportion of
Population, at 12 percent of the County's total.
GOAL 4 -G -5: Solid Waste
Meet Petaluma's solid waste disposal needs while
maximizing opportunities for waste reduction, reuse,
and recycling, in compliance with the California
Integrated Waste Management Act of 1989.
Policies and Programs.
See also Section 10.3: Hazardous Waste Management
for policies relating to Hazardous Waste storage and
disposal.
4 -P -21 Reduce solid waste and increase reduction,
reuse and /or recycling, in compliance with the
Countywide Integrated Waste Management
Plan (CoIWMP).
A. Work with Sonoma County, to identify
environmental and economical means to meet
the need for solid waste disposal.
8. Require new or remodeled residential and all
non - residential development to incorporate
sufficient, attractive, and convenient Interior
and exterior storage areas for recyclables and
green waste.
C. Continue to encourage waste reduction
and recycling at home and in businesses
through public education programs, such as
Informational handouts, on recycling, yard
waste, wood waste, and hazardous waste
collection.
D. Develop a residential and commercial food
waste composting program.
E. Purchase goods containing recycled materials
for City use.
F. Continue to cooperate, require, and /or support
the operation of resource recovery facilities
by the City waste hauler and the disposal site
operators.
G. Investigate and replace bottled water in City
offices with alternate source of drinking water.
H. Ensure that all public facilities have adequate
and accessible depositories for recyclables.
00, ofPetahmta Floodplain Management Plan
82
The Natural Environment A
4 -P -22 Require future waste contract negotiations to
include the following:
A. Disposal of City waste products at a site with
the least potential for environmental impacts.
B. Discussion on resource recovery services for
Petaluma waste.
C. The Identification of recycling and waste stream
diversion goals.
D. Hazardous waste collection.
4.5 GREENHOUSE GAS EMISSIONS
Petaluma seels to evaluate and lessen the impact of
greenhouse gat emissions by reducing emissions,
conserving resourtes and Implementing the goalt,polides
and programs outlined in the General Plan 2025.
GLOBAL
Climate change is a shift in the average weather patterns
observed on earth, which can be: measured by such
variables as temperature, wind patterns, storms and
prrciphation.'1he tempenture on earth is regulated by
what is commonly known as the "greenhouse efltct."
\raturaliy, occurring greenhouse gases in the atmosphere,
including carbon dioxide, methane, nitrous oxides, and
water vapor, absorb heat from the earth's surface and
radiate it back to the surface.
Human activities result in emissions of four principal
greenhouse goes: cubon dioxide, methane, nitrous
oxide, and halocarbons (fluorine, chlorine and bromine).
Of all human activities, the burning of fossil fuels is the
largest contributor in overall greenhouse gas emissions,
releasing carbon dioxide gas into the atmospheres
the resulting Increases in greenhouse gas emissions from
human activities are leading to higher concentrations and
a change in composition of the atmosphere. For Instance,
the concentration of CO2 in the atmosphere has risen
a6out30percentsince thelate 1800s (NationalAssessment
Synthesis Team [N'AST], 2001).' Many sources and
models indicate that temperatures on earth are currently
warming and will continue to xwm at unprecedented
levels.1he global mean surface temperature has increased
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Resolution No. 2015 -153 N.C.S.
4-11
September 21, 2015
Page 86
Petaluma General Plan 2025
by 1,1' F since the l9ih century (IPCC Synthesis report,
2001), and the 10 warmest years of the last century all
occurred within the last 15 years!
T1tc many elects of greenhouse Gas Emissions are still
beingresearchedandare not futlyl nowri,butareexpected
to include increased temperatures which would: reduce
mcmpaclt, aprimarysource ofdrinking wateri exacerbate
Pit quality problems and adversely impact human health
by increasing heat stress and related deaths; increase the
incidence of infectious disease, asthma and respiratory
health problems; cause sea levels to rise, threatening urban,
and natural coastlands; increase pests and pathogens; an d
cause variations in crop quality and yields.
This section or the General Plan is focused on the
reduction of greenhouse gas emissions. To the extent
that Petaluma is affected by global warming, rot example
rises in sea level, the issues are addressed in the Water
Resources Element.
STATE OF CALIFORNIA
In California, the majority of human activity greenhouse
gas emissions can be broken down into four sectors:
transportation, Industrial, electrical power, and
agriculturelforestry. 'flit largest source is from the
transportation sector.'
In 2005, Governor Schwarzenegger issued Executive
Order S- 02 -05, calling for statewide reductions to 2000
levels by 2010, 1990 lnels by 2020 and to 80 percent
below 1990 levels by 2050. 71re Executive Order also
called for the creation of a. state "Climate :lotion Team",
which would report to the Governor every two, years on
both progress toward meeting cite targets and ctlects of
Greenhouse Gas Emissions on the state.
In the Fall of 2006, the Governor signed Assembly Bill
32 (AB32), the "Global Warming Solutions Act of 2006,"
committi ng the State of California to reducing greenhouse
gas emissions to 1990 levels by 2020. The statute requires
the California Air Resources Board (CARB) to track
emissions through mandatory reporting, determine
what 1990 emissions were, set annual emissions limits
that will result in meeting the target, and identify a. list of
discrete early actions that directly address greenhouse gas
emissions, are regulatory; and can be enforced Lry January
1, 2010.
CITY OF PETALUMA
Afuniripul Grttnbonst GatEmissimu
a -12
City of Petabmta Floodplain Management Plan
83
On August 5th, 2002, the City Council adopted
Resolution 2002 -117 committing to participate in the
Cities for Climate Protection. By doing to the City
committed to:
• Tilfng a leadership role In promoting public
awareness about the causes and impacts of
Greenhouse Gas Emissions.
• Undertaking the Cities for Climate Protection
progr,uu's five milestones to reduce greenhouse
gas and air pollution emissions throughout the
community by:
1. Conducting a greenhouse gas emissions
inventory and forecast to determine the source
and quantity of GHG emissions.
2. Establishing a greenhouse gas emissions
reduction target.
3. Devel opIngan actionplan with bothexfsting
and future actions to meet the greenhouse gas
reduction target.
4. Implementing the action plan.
5. Monitoring to reyitnv progress.
In 2005 the City completed steps 1 and 2. On July 18,
2005 the City passed Resolution 2005 -118, "Resolution
to Establish GHG Emission Reduction Target(s) for the
City of Petaluma. Resolution 2005 -118 established
greenhouse gas emissions reduction targets of 259b below
1990 levels by 2015 for community emissions and 20%
below 2000 levels by 2010 for municipal operations. The
Cit3A reduction targets are more stringent than those
passed by the State. Tltc City is currently working on
Step 3, development of the action plan for municipal
emissions.
Also, the City signed the U.S. Mayors Climate Protection
Agreement calling for participating cities to meet or
surpass the Kyoto Protocol targets, and the resolutions
above do surpass the Kyoto targets.
Since 2005 the City has implemented, or is in the
process of implementing, many programs to reach
the municipal operations goal. 'lhese include: a major
lighting retrofit at City I fall, the Police Department and
the Lucchesi Community Center; replacement of four
traditional fuel fleet vehicles with one zero emf"lon
electric vchide and three hybrid vehicles; retrofit of nine
"off - road" vehicles (dump trucks, vicuurn truck, ctc) to
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 87
The Natural Environment
Tahla d 5 -L cetaunna fentmunn -wide ieen and 7nn5 rreenhnuse raa emlsslon4 and vrolerted Emisel— fat 7525
14�tm C.I.— may not add dui to rounding.
comply with the California Air Resources Board loiter
vehicle emission reguladons7; replacement of 99 percent
of the incandescent traffic lights with LLD lights; and
replacement of three of nine 1989 diesel buses with
four, 2007 Gillfg models, tvialdi are equipped 119th
clean burning diesel engines that meet the 2010 CAR.B
regulations. As standard procedure, the Public Vlorlcs
Maintemmce & Qpentions st;tll'replaccs older lighting
fixtures with energy c0cient uniu, as the original fixtures
burn out.
•tlle Green Teant, a Council sanctioned group composed
of City staflntendlers and interested citizens, was formed
to analyze City procedures and processes to identify areas
of improvement, educate staff and the community, and
sponsor the Going Green Expo.
'the City 1s currently preparing a Climate Action Plan
(CAP) for its municipal activities per Resolution 2002-
117. 'Ihe purpose of the municipal CAP is to identify,
and prioritize programs, ojeces, and proceduralpolicies
that will help the City achieve the municipal greenhouse
gas emission goals of Resolution 2005 -118.
7 Cdir"rn L- ,i—ftl he—;.. Ac— K. Fn.. E.u- rivwmba 1;01 EV 0
- A^aadmand m Cd3ar-:.ab ft aX. —
City of Petahana Fioodpiain Managentent Plan
84
CommuniV G»vtnhortst Gals Emissions
As stated above, Resolution 2005 -118 established
greenhouse gas emissions reduction targets of 2S?o below
1990 levels by 2015 for community emissions. The
primary sources of community greenhouse gas emissions
In Petaluma are identified in Table 4.1 -1 on the following
page. In summon; residential and commercial buildings
are responsible for about 40 percent; transportation is
responsible for about 55 to 59 percent; and municipal
services and solid [taste management account for about
2 to 5 percent of emissions.
Emissions have grown from about 434,900 tons in
1990 at about 10.1 tons per person to 610,400 tons in
2005 at about 10.7 tons per person. Without benefit
Of the policies In the General Plan, emissions in 2025
are estimated to be 721,600 tons at about 9.9 tons per
person. Although emissions mould continue to increase,
the rate of increase Is expected to slow in the future based
on implementation of the General Plan policies and State
measures.
Throughout this Genera) Plan, many far- reaching
goals and policies are identifit•d to promote the vision
Resolution No. 2015 -153 N.C.S.
4 -13
September 21, 2015
Page 88
1990
2005
2025
009
Cots
Goss
Elediolty
Natural Gat
Emisalon,
Pamanlof
Elec6lclty
Natural Gab
En""ldnt
Peruntof
E-actrialy
Natural Gat
Esllealons
Forcentor
{kWh(
Thermal
(tonal
Total
hwh )
(Thams
[tone)
total
(kVh
(Mme)
limit
Total
Buildings
335233,023
9,033,713
172207
405' .
45.3,7512,623
12,245,73E
237,403
33%
554,tE3,117
15572,117
a2,E00
- 47°% -
1uniolpal
serMes
Natar a
Sams
E.134.CC9
203
2,1•F
05%
6,716,555
278
2ac0
0%
10,14E,379
6,[87
3,EC0
1•.5
Viable
Watts
Watts
Generated
l:;onarated
Generated
Population
(tons)
Population
lions)
population
(tone)
Scud Watt
13,230
43,567
22,570
5'%
57,035
29.145
12,507
255
72,707
- 37,173
15,977
255
Vardele
4'151018
'Aide[$
AUlet
late
Mlles
Traveled
Traveisd
Traveled
For-
Uon
303,392,640
236,{[0
155'.
°14,710.3:5
3`_3,107
51%
652,352,145
40 270
5755
TOTAL
434,900
1C0%
6101482
100:%
721.149
14CK
Bro9ia
17%Inae9e9pefye3f
o.fi`41ncrBeaeperyear
tvraaas
from 1990 t5 2405
1 11
4nm 2005 to 2015
14�tm C.I.— may not add dui to rounding.
comply with the California Air Resources Board loiter
vehicle emission reguladons7; replacement of 99 percent
of the incandescent traffic lights with LLD lights; and
replacement of three of nine 1989 diesel buses with
four, 2007 Gillfg models, tvialdi are equipped 119th
clean burning diesel engines that meet the 2010 CAR.B
regulations. As standard procedure, the Public Vlorlcs
Maintemmce & Qpentions st;tll'replaccs older lighting
fixtures with energy c0cient uniu, as the original fixtures
burn out.
•tlle Green Teant, a Council sanctioned group composed
of City staflntendlers and interested citizens, was formed
to analyze City procedures and processes to identify areas
of improvement, educate staff and the community, and
sponsor the Going Green Expo.
'the City 1s currently preparing a Climate Action Plan
(CAP) for its municipal activities per Resolution 2002-
117. 'Ihe purpose of the municipal CAP is to identify,
and prioritize programs, ojeces, and proceduralpolicies
that will help the City achieve the municipal greenhouse
gas emission goals of Resolution 2005 -118.
7 Cdir"rn L- ,i—ftl he—;.. Ac— K. Fn.. E.u- rivwmba 1;01 EV 0
- A^aadmand m Cd3ar-:.ab ft aX. —
City of Petahana Fioodpiain Managentent Plan
84
CommuniV G»vtnhortst Gals Emissions
As stated above, Resolution 2005 -118 established
greenhouse gas emissions reduction targets of 2S?o below
1990 levels by 2015 for community emissions. The
primary sources of community greenhouse gas emissions
In Petaluma are identified in Table 4.1 -1 on the following
page. In summon; residential and commercial buildings
are responsible for about 40 percent; transportation is
responsible for about 55 to 59 percent; and municipal
services and solid [taste management account for about
2 to 5 percent of emissions.
Emissions have grown from about 434,900 tons in
1990 at about 10.1 tons per person to 610,400 tons in
2005 at about 10.7 tons per person. Without benefit
Of the policies In the General Plan, emissions in 2025
are estimated to be 721,600 tons at about 9.9 tons per
person. Although emissions mould continue to increase,
the rate of increase Is expected to slow in the future based
on implementation of the General Plan policies and State
measures.
Throughout this Genera) Plan, many far- reaching
goals and policies are identifit•d to promote the vision
Resolution No. 2015 -153 N.C.S.
4 -13
September 21, 2015
Page 88
Petaluma General Plan 2025
for Petalurnas long -range physical and economic
development -ind resnnrcc Conservation. ih is puliciks,
in such trey areas as land use, conservation, systems
efficiency, safety, mobility and housing, serve a dual
purpose to implement the City's long -range goals and
also require that growth occurs in ways that reduce the
City's contribution of greenhouse gas emissions, see the
following chapters:
1. Lund Use, Growth Management and the Built
Environment
2. Community Design, Character, and Green Building
5. T- lobility
6. Recreation, hfusic, Part -s, & the Ares
7. Community Facilities, Sertiices, and Education
S. Nr'atcr Resources
9. Economic Health and Fiscal Susrainability.
Goal 4 -6-6: Greenhouse Gas Emissions
Reduce the contribution to greenhouse gases from
existing sources and minimize the contribution
of greenhouse gases from new construction and
sources.
Policies and Programs:
4 -P -23 fund and/or designate a Green Program Manager
to oversee implementation of all Greenhouse
Gas Emissions policies and programs identified
in the Greenhouse Gas Emissions section as well
as the City's Climate Action Plan. The policies and
programs will need to be reviewed and updated
periodically as new information, regulatory
standards, and technologies develop. A report
shall be provided to the City Council biannually,
reporting on the status of the City's efforts to
reduce green house gases, and recommendations
for any changes that are deemed necessary.
4 -P -24 Comply with AB 32 and Its governing regulations
to the full extent of the City's jurisdictional
authority.
4 -P -25 To the full extent of the City's jurisdictional
authority, implement any additional adopted
State legislative or regulatory standards, policies
and practices designed to reduce greenhouse gas
emissions, as those measures are developed.
4 -14
City of Petaluma Floodplain Management Plan 85
4-P -26 Implement all measures identified in the
municipal Climate Action Plan to meet the
municipal target set in Resolution 2005.118
(20% below 2000 levels by 2010).
4-P -27 The City shall prepare a Community Climate
Action Plan to identify and prioritize programs,
projects, and procedural policies that will help
the City achieve the community greenhouse
gas emission goals of Resolution 2005 -118 (25%
below 1990 levels by 2015).
4-P -28 Prepare a feasibility report for the City of
Petaluma forming a Community Choice
Aggregation (through AB 117, permits any city
or county to aggregate the electric loads of
residents, businesses and municipal facilities
to facilitate the purchase and sale of electrical
energy) as a way of supplying renewable energy
to the community,
4-P -29 Train appropriate City staff on new technology
and look for opportunities to improve energy
efficiency in public facilities.
4-P -30 Continue to monitor new technology and
innovative sustainable design practices for
applicability to insure future development
minimizes or eliminates the use of fossil fuel
and GHG- emitting energy consumption.
4-P -31 Provide information and tips on reducing
greenhouse gas emissions to the community,
A. Advertise "Green Tip" In the local newspaper.
B. Work with utilities to offer Green Tips with the
utility bills.
C. Continue sponsoring Petaluma's green
programs, including, but not limited to, the
Going Green Expo.
D. Create a program of on -going community
education.
E. Support the efforts of the Sonoma Green
Business Program,
4-P -32 Develop and implement a municipal
Environmentally Preferable Purchasing
Program,
4 -P -33 Investigate the feasibility of developing a City
sponsored program to subsidize or assist home-
owners in purchasing solar water heating
or passive solar systems, or other forms of
renewable energy, through low - interest loans
or property tax assessments,
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 89
Appendix C
City of Petaluma, California appendix C
Fiscal Year 2016 Budget
SURFACE WATER PROJECTS
FY 2015 -2010
SURFACE WATER CAPITAL IMPROVEMENT PROGRAM BUDGET FY 15 -16
PROJECT SUMMARY
Fund S790.31900
PROJECTS (dollars In 4C001
0305032[3 RNar Par -D vran Reach Phase 3
C16301307 FeWim RL'er FlCai Cortrol
01 6 3 01 41 3 Cap"' Creek Re- CcnloLTIrg S
Terr-a'Ilg
C16301415 Sun's Water Fro;?Cts
030502705 Laketle Chance+ Irnr(wrlente
03 0 5 0 33 03 Stearr Ard Preciptatlon Gauges
C16301414 Kery Creek 11otl Intone
aahirgsar Cre_Y Raps
!t S
Enharae
C16301417 W metl
01 6 3 01 51 8 Old C ^.tuna Road Wa.sr OVaity
IrDpven Fro}act
TOTAL
SOURCES (dollars In {000}
Stotn Dr3'r3Ge trrpa -1 Flee
State Gents
SCWA zone 2A Assaevrents
DeP1 of W31et R QSMIS Grar1
open Spa'- Gran
Amy Copp of Engsleera
Und='Arnlne7
TOTAL
ACtual Life
$ 57
5 '744
S (131;
ono,lhev
S -
S -
S 1,045
13 Date lhr3
Ealnrate
mg-t
TCUI
-
-
1,840
&3016
FY 1415
FY 1E-1E
FY 16 =17
FY 17 -15
FY 1349
FY 19.20
ESEnala
3 761
5 402
5 1,456
S -
S
5 -
5 2,659
343
1
2,8D3
3.147
9
22
`. 100
£69
1,1W
4
1,230
12
1,230
-
2,4E4
20
5 494
40
S 4.081
S 12
S 1,212
S -
34
E2
10
:107
179
E2
1,110
20
1°5
175
22
131
772
12
12
943
S 1,2u'0
5 484
5 4,651
S 4,031 I
S 12
5 "242
Lt
5 1"870
5 375
$ 57
5 '744
S (131;
S -
S -
S -
S 1,045
E50
335
E25
-
-
1,840
82
62
1,337
1,254
2,735
993
993
e0
E0
"820
1,823
2133
12
1242
33E7
3 "097
5 494
5 4,944
S 4.081
S 12
S 1,212
S -
S 11,870
CIP -S 1
00, of Petaluma Floodplain Management Plan 86
Resolution No. 2015 -153 N.C.S.
September 21, 2015
Page 90
City of Petaluma, California
Fiscal Year 2016 Budget
0
CAP -82
Cif} +ofPetalnnta Roodplain Management Plan 87
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 91
City of Petaluma, California
Fiscal Year 2016 Budget
Project i-itle: Denman Reach Phase 3 C00800208
PROJECT PURPOSE AND DESCRIPTION
This project is located along the Petaluma River, upstream of Corona Road within the Denman Reach. The
project consists of acquiring properties and obtaining temporary construction and permanent trail easements to
allow the excavation of a longitudinal bench along the low -flout channel of the river. The objective is to create a
flood terrace and restore the wetland and upland habitat areas upstream of the previously constructed Phase 1
and 2 projects. This will stabilize the existing Incised river channel and unstable bank areas, Improve hydraulic
function, and reduce localized flood levels currently impacting adjacent development in the City and
unincorporated areas-
FINANCIAL OVERVIEW
O_7c00%''3
USES (dollars in $000)
Plarning %Enqron rents!
Land & Easements
C ign
Legal Se'ltcea
Administration
GnsUUCtion Contracts
Ccnstn[Cdon higmt
S&Iades and Benefits
Ccntingency
CIP Overheads
TOTAL USES
SOURCES (dollars in $600)
Stcrm Drainage Impact Fes
State Grants
SC4VA Zor;e 2A Assssmaits
D:-,t oIW3 er Resources Gr_rt
Open Space Graft
TOTALFUNDS
Excenses and Fur-ds Received
BUDGET
Actual Life to
Estimate
PROJECTED
Total
Date thru
Estimate I Life to Date
Proposal
P rcject
6!30114
FY 2015 Lhm &'20175
FY 1518
FY 10-17
FY 17 -14
FY 1849
FY W-29
Estimate
Off' 40
'. -ZS
65
073
200. 873
192
_
1.055
36
50
150: 1.
8
194
2
2 -4.
a
_..... _5
_.
1,0_Ft3.
1.055
24
24
73
1e2
23
23
_.
23
100
iD3
3
]0 13
26
49
$ 011$
4021 1,1531$
1,6611
.13
.15
-Is
-is
2,659
I
8
&
Si
59
880
355: 1,015
_
1,015
47 47
'4?5
612
9'dJ
993
_-
$ 853
$ 402 $.... 1.070
S ..1.559
S -
S
S.
S
S 2,659
CIP•83
Cittr ofPetahnna Roodplain Management Plan 88
Resolution No. 2015 -153 N.C.S.
September 21, 2015
Page 92
City of Petaluma, California
Fiscal Year 2016 Budget
PETALUMA RIVER FLOOD CONTROL
1 41, j%
W.PAYRAN 51
�w }
Project Location
w 1 G
_•<.''( it
j\ - � x /✓
sr
1 i
~
-
I
m
QP -84 `) `y
00, ofPetahtma Floodplain Management Plan 89
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 93
City of Petaluma, California
Fiscal Year 2016 Budget
Project Title: Petaluma River Flood Control C16301307
PROJECT PURPOSE AND DESCRIPTION
This project completes the U.S. Corps of Engineers Petaluma River Flood Control Project within the Payran
Reach. This wort: includes approximately 100 ft. of sheet pile flood wall extension to the SMART bridge
abutment, embankment and storm drain outfali repair, and sheet pile cap repair. Projected costs represent only
the City's 35% cost share of the proposed project. Construction drawings are complete and the project is
expected to be ready to bid in late spring 2015, pending funding by the Corps.
FINANCIAL OVERVIEW
01533*37
USES (do Ilan In SON)
P13nr.MglEnVronmanal
Land d Eas=- -Tents
DE31gn
Le931 S VA, -Era
AdTMtslraton
CC•nEiTdUCn Cant n
Cc�sirtetidn )dgmt
s an£e and 8enedts
CdnUngenq•
CIP Ow -Muds
. TOTAL USES
SOURCES {dollars In $OOO)
Stun C2lnada Imp a Ft Ea
SC%VA Zara 24 Amn Elflerts
Army Co,•ps Clang:'
TOTAL FUNDS
Ezpzrsea and Fends REcehs!
BUDGET'
AM31 L*e 10
i
E3tanale UE+
PROJECTED
Date tnrtl
Estimate FY..
to Cale Om
PmpasM FY
Total Pried
E3@74
1 2015.
EIM15
1 --15
FY 1617
FY 17 -15
FY M-15
FY 1g -20
EeLT31.e
2
4
2
3
3
3
327
327
327
.2.780
2,780
20
20
7
7
7
S 341
S'', 3'.
S u7
is 2.E00
I 3 -
3 -
3 -
3
S 3,147
I I
i
T.
It
347
430
537
430
4N
1.520.
1,520
S 33b
S+ 11':
S 347
S `'2,G30
3 -
3
3
3 -
S 3,147
CIP -85
City of Petaluma Kooclplain Management Plan 90
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 94
City of Petaluma, California
Fiscal Year 2016 Budget
CIP -8aki'
City of Petahmta Floodplain Management Plait 91
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 95
City of Petaluma, California
Fiscal Year 2016 Budget
Project Title: Capri Creek Re- contouring and Terracing C16301413
PROJECT PURPOSE AND DESCRIPTION
The project will Improve channel hydraulic capacity to reduce out of bank flooding and ease of maintenance. The
creek will be re- contoured west of Maria Dr. to better define low flow channel, create a flood terrace and a
sediment/debris removal basin at the downstream Inlet.. Additionally in- stream habitat structures and plantings of
native trees and shrubs will be added along the newly defined riparian corridor. The project will be funded largely
through a State grant and Zone 2A funding with additional supplemental funding from Storm Drainage Impact
fees.
FINANCIAL OVERVIEW
C15131413
USES (dollars in 3000)
Planrirg7Em Jrormental
Land & Easements
De�gn
Legal Senices
Admfnistrafcn
Corstruttloi Contracts
Construction Nana
Sallies and Beneits
Cortingency
CIP Oserheeds
TOTAL USE
SOURCES (dollars in $000)
Sic,tn Dr_ -irage Impact Fees
State Grants
SCSwA Zora 2A Assessments
TOTAL FUND!
Expenses and Fods Reae:.ed
BADGE!
Actual Ufa
"27
Estimate
PROJECTED
Total
5a
to Date thru
Estimate
Ve to Date
Proposed
Protect
E'30114
FY 2015 '
thru 0736x15
FY it: -10
FY 15.17
FY 17 -18
FY 18.19
FY 19.20
Estimate
2
20
22
19
2
969 I
$ -
S
43
S L107
2
2
2
.
04
875
_..
239
15
03
83
1
1
2
24
27
$ 9$
22
S 31
S `100
S 969
5 -
5 -
S -
S 1,10;}
9
2211
31
"27
5a
825
825
73
144
217
10013
969 I
$ -
S
5 -
S L107
CIP -87
City ofPetahnna Floodplain Management Plan 92
Resolution No. 2015 -153 N.C.S.
September 21, 2015
Page 96
City of Petaluma, California
Fiscal Year 2016 Budget
CAP - &S ty4{
City ofPetahana Floodplain Management Plan 93 September 21, 2015
Resolution No. 2015 -153 N.C.S.
Page 97
City of Petaluma, California
Fiscal Year 2016 Budget
Project Title: Surface Water Projects 016301416
PROJECT PURPOSE AND DESCRIPTION
A five -year surface Water project list has been developed to prioritize future capital projects. Likely future projects
Include creation of sediment basins on Adobe Creek, minor localized flood improvements Within neighborhoods,
developing a stewardship program and Improving creekside trails on Adobe Creek, Lynch Creek, and Washington
Creek, bank stabilization on Lynch and Washington Creeks, detentionlretention ponds for Willowbrook Creek, and
feasibility studies for increased retention pond sites.
FINANCIAL OVERVIEW
C16301415
USES (dollars In $000)
Pia nninglErMronmantal
Land S Easements
Design
Legal Senses
Administration
ConstmcCon Contracts
Construction Mgmt
Salaries and Benefits
Contingency
CI? O erheads
TOTAL USES
SOURCES (dollars in $000)
Storm Drainage_ Impact Fees
Undeterrnir_i
TOTAL FUNDS
Expenses and Furds R- ::Eved
BUDGET
Actual We
to Date thin
0130!14
Estimate
FY 2015
Estimate
Li �to Date
thru 013D115
Proposed
FY 15-16
PROJECTED
Total
Prq °,__t
Estimate
FY to -17
FY 17-15
FY 15 -16
FY 10 -20
4.
_ .
4
-
1,OOD
115
100
tA00
115
100
2,6'0
230
_..4
20
S 4
S. -'.
S 4$
S 1,2s0
S -
S 1,230
S
1
�
i
2
. _.2+
-
4
-
1,230
1,230
4
2,4 0
S 2
iii, 2$
41S
--
S 1,2 -s0
S
S 1.230
$
$ 2,4 ?4
CIP -SD
007 ofPetalmna Koodplain Management Plan 94
Resolution No. 2015 -153 N.C.S.
September 21, 2015
Page 98
City of Petaluma, California
Fiscal Year 2016 Budget
CIP -B0
Ctty ofPeta&ona Floodplain Management Plan 95
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 99
City of Petaluma, California
Fiscal Year 2016 Budget
Project Title: Lakeville Channel Improvements C00500705
PROJECT PURPOSE AND DESCRIPTION
The City currently owns and maintains an open drainage ditch at 960 Lakeville Street. The ditch conveys storm
water runoff from Lakeville Street and the surrounding area Into an adjacent channel. Maintaining adequate flow
capacity of this ditch is exacerbated by the growth of cattails. Staff will study options to improve flow. The potential
environmental impacts of this proposed project have been determined, and mitigation alternatives need to be
evaluated in order to proceed with construction.
FINANCIAL OVERVIEW
C00500705
USES (dollars in 5000)
Plan rrg7Emircnmental
Land & Easements
Ceslon
Legal Services
Administration
Construction Contracts
Construction 61gmt
Salares aid eerefts
Contingency
CIF O *—,heads
TOTAL USES
SOURCES (dollars In $000)
Storm Drainage Impact Fees
TOTAL FUNDS
Ex pens and Funds
Rece\ed
BUDGET
Actual We
to Date thru
MUM
Estimate
'FY A15 <
Estimate
Lit to Date
ithij 0130115
Proposed
FY 15.10
PROJECTED
Total
Protect
Estimate
FY 10 -17
FY 1745
FY 1a -19
FY 10 -20
19
19
190
10
S 20
3
S 2513
1013
S
s
5 -$
&]
,l
1
I
2,31
1 20
10
20
IS 201S
-'.
5 201S
10. s -is
-is
IS
s 30
CIP -91
01j, ofPetaltuna Floodplain Management Plan 96
Resolution No. 2015 -153 N.C.S.
�r7
September 21, 2015
Page 100
City of Petaluma, California
Fiscal Year 2016 Budget
,/
i r
C_ 5
ttt iiy 1
! L
I
� F
p Jr`s
A
1 ;0 ty 1AAlOUN�A4NP J
If
j
• PROJECT LOCATIONS
ti
CIP -62
Ch), ofPetahnna F7oodplain Management Plan 97 September 21, 2015
Resolution No. 2015 -153 N.C.S.
Page 101
City of Petaluma, California
Fiscal Year 2016 Budget
Project Title: Stream and Precipitation Gauges 000500308
ROJECT PURPOSE AND DESCRIPTION
This project is located throughout the Petaluma River watershed Within the City limits, as well as unincorporated
Sonoma County. The project consists of the installation of ten additional gauges to measure and record stream
depth and precipitation. The purpose is to obtain additional data necessary to evaluate surface Water runoff and
flooding in the Watershed. These gauges will also augment the existing gauges used for City flood response
activities. This project has been approved for funding by SCWA Zone 2A.
FINANCIAL OVERVIEW
C01:G0=
USES (dollars in $000)
PlanrngtEmkonntental
Land & Easemerts
De !p
Legal Serices
Admnistration
Coratm'.fcn Cor tracts
Corstmctcn Mgmt
Saiares and Benefits
Cortngerr-y
CIP Overheads
TOTAL USES
Experses
Actin Lire
to Date Wfu
673,'14
and Funds R_ceNed
Estimate
Estimate Li4 to Date
FY 2015_s Irm ismt7!
BUDGET
PROJECTED
Proposed
FY 16 -16 FY 16.17 FY 17 -18 FY 13-19 FY 1020
Total
Proie.t
Est-mate
to
10
10
`5
39
144
it
11
_3.
,.3.
1
t
4
0
SOURCES (dollars in $000)
Stan Dr~mage Impact Feas - `5 q174
SC14A Zone 2A Assessrcts 62 1D'. 72 102 TOTAL FUNDS S 62 11 10 S 71 S -..10T S - S - S - 5 - S
CIP -93
City ofPetallana Moodplain Management Plan 98
Resolution No. 2015 -153 N.C.S.
September 21, 2015
Page 102
City of Petaluma, California
Fiscal Year 2016 Budget
CIP -94
City of Petaluma Floodplain Management Plan 99
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 103
City of Petaluma, California
Fiscal Year 2016 Budget
Project Title: Kelly Creek Modifications C16301414
PROJECT PURPOSE AND DESCRIPTION
The project will redirect culvert flow to a new storm drain line in D Street and reconnect the natural flow from Kelly
Creek at Sunnyslope back into the Kelly Creek natural channel. The first phase of work is to assess current
conditions and existing capacity in the storm drain system to determine the project scope. The second phase is
construction. The schedule will be based on priority and available funding. Initial funding for preliminary analysis
and engineering will be Zone 2A assessments. Staff is seeking funds for construction.
FINANCIAL OVERVIEW
010301414
USES (dollars in $000)
PlannitV an4mrimental
Land & Easements
Cosign
Legal Services
Administration
Construction Contracts
Cc,wructton 1Agmt
Satsres and Bera`ls
Contingency
CP D*rheads
TOTAL USES
SOURCES (dollars In $000)
SCYtA Zone 2A Assessments
TOTAL FUNDS
Expenses and Funds Received
BUDGET
Actual Lire
to Date trrru
5130114
Estimate ;
FY,2015
Estimate
Li`-- to Date
Wm 5130115
Proposed
FY 15.10
PROJECTED
Total
Froect
Es5rnate
FY 15 -17
FY 17.18
FY 15 -1.9
FY 19.20
5
5
52
9 ]
90
5
52
907
S7
- 93
S 1$
AS
5
S ' 82
$ t,tl0
S -IS
-1$
-1$
1,107
t
1
I
1
51
51
621
1,110
1
1
1,707
S -IS
515
513
621$
1.1101$
5 -is
-1$
1,107
CIP -95
City ofPetah nta Moodplain Management Plait 100
Resolution No. 2015 -153 N.C.S.
September 21, 2015
Page 104
City of Petaluma, California
Fiscal Year 2016 Budget
0 �.
<17'
CIP -9a
City ofPetaluma Floodplain Management Plan 101
September 21, 2015
Resolution No. 2015 -153 N.C.S. Page 105
City of Petaluma, California
Fiscal Year 2016 Budget
Project Title: Washington Creek Repair & Enhancement 016301417
PROJECT PURPOSE AND DESCRIPTION
The project includes bank repair and native riparian plantings on Washington Creek starting at N. McDowell Blvd.
meandering upstream through subdivisions to Prince Park. Environmental analysis, permitting and design are
scheduled for 2015 with construction in 2016.
FINANCIAL OVERVIEW
018301417
USES (dollars In 5000)
PianninVEmironmental
Land & Easements
Design
Legal Services
Administration
Construction Contracts
Construction Mgmt
Salaries and Benefits
Contingency
OF Owheads
TOTAL USES
SOURCES (dollars in §000)
SCWA Zone 2A Assessments
TOTAL FUNDS
Expenses and Funds Recei-pd
BUBGEr
Actual Lie
to Cate thru
grK114
Estimate
FY 2015
Estimate
Life to Date
Ithru d-Mi!
Proposed
FY 15 -15
PROJECTED
Total
Fro�ect
Estimate
FY to -17
FY 17-la
FY 18.1.2
FY 19 -20
.20
20
125
20
125
S
S. 20'
S 20
$ 1011,
S
5
S
$
$ 175
f
2D1
20
155
1
1 1
1
1 175
Is
s '21) 1
S 201$
155
S
8 s
$
$ 175
CIP -97
City ofPetahnna Noodplain Management Plan 102
Resolution No. 2015 -153 N.C.S.
September 21, 2015
Page 106
City of Petaluma, Callfomia
Fiscal Year 2016 Budget
,
� l
F
Project Location
XV
i,
"._
t
i
CIP -SS
City of Petahnna Hoodplain Management Plan 103
Resolution No. 2015 -153 N.C.S.
`1
September 21, 2015
Page 107
City of Petaluma, California
Fiscal Year 2016 Budget
Project Title: Old Corona Road Water Quality Mitigation C16301518
PROJECT PURPOSE AND DESCRIPTION
This project will improve the water filtration and carrying capacity of an existing roadside open ditch adjacent to
Old Corona Road. The ditch receives surface water flows from Highway 101 for a distance of 550 linear feet and
approximately 25-30' in width. At the downstream end of the roadside open ditch the low flow will be diverted to
hvo bio- retention basins for further water quality improvement prior to discharge to the Petaluma River.
FINANCIAL OVERVIEW
CIOM1518
USES (dollars in $000)
Flanting�Envronrrerdal
Land & Easernents
C sigi
Legal S"ces
Admmistnation
Cnnmotion CcnlraGs
Ccn3uLcTico',tgnn
Calades anj Eenerds
Contn9 y
OF O.rheade
TOTAL USE:
SOURCES (dollarsInSOW)
Storm Craira; Impact ices
Lhd3ermired
TOTAL FUND;
Experses and Finds Receied
BUDGET
Actual Life
Estnta`.e
PROJECTED
Tcl3
to Date tint
Estimate
L& to Date
ProVSEd
Prcje_t
d0d'14
FY 2315
thru d'Y311d
FY 1518.
FY 1347
FY 17 -1s
FY 18-19
FY 10.20
Estimate
20
10
12
42
-30
74
74
2:
2
$
7
- - --
672
7
7
ea
100
5
5
110
5
$ 22'
S 2215
131
$ 7-721$
121
S 1215
$ 040
i
2222131
(131'
1
035
12
12
027
$
$ 221
?2
S 131
$ 772
$ 1213
12
S
$ 049
CIP -99
City ofPetalnnta FWdplain Managentent Plan 104
Resolution No. 2015 -153 N.C.S.
ti
September 21, 2015
Page 108