HomeMy WebLinkAboutAgenda Bill 4CPart5 05/17/2010ult~-Flydrograph PFo~
' Hydraflow Hydrographs by Intelisolve
Hyd. No. '0 Fiyd. No. 3
Ex. Hydrograph <no description>
Hydrograph type =Rational Hydrograph type =Reservoir
Peak discharge = 1.04 cfs ~ Peak discharge = 1.02 cfs
Time to .peak = 15 min Tirne to peak = 15 min
Hyd. Volume ~ = 933 cuff Hyd. Volume = 1,154 cult
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IIGTA BECnMF..S100 ~S AOF1T10NAL RAINFALL '~T~~~LrY V~ 'JIOR®~~~y~
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MEAN SEASONAL PRECIPfTATION -INCHES
80
~~~~
Consultants in Horticulture and Arboriculture
T~~ 1 J~1\ d A®1 V A
lUIIT'IGATIOI~T PORT'
(~CT~'DA~ED)
SUNNY D DEVJELOPMENT
1.31.1 "D" Street & 216 Sunny Slope Avenue
Petaluma, California
PREPARED POR:
Mr. Greg Asbell
73-1529 Apela Place
ICailua-Kona, HI %740
PREPARED BY:
,John C. Meserve
Member, American Society of.'Consulting Arborists
International Society of Arboriculture WCISA #478
JULY 27, 2009
~o
Ivlr. Greg As6ell
7/27.%09
Paget of 2
This inventory does .not°indude documentation or illustration of 'the 7 mitigation trees that
will. be installed in the future as replacements for trees already .removed in Phase I of this
project. We previously recommended that 6 replacement trees be installed. along the south
property lines of parcels 1 and 2, and.. one replacement .tree. be installed along the east
property line of parcel 2,. These trees have not yetbeen installed; and are noted in this
cover letter for future reference.
All preserved trees should be periodically monitored by a consulting arborist during and
after construction to ensure that decline br hazard does .not develop. Each tree must be
protected and mitigated per this report, and common sense, to have a reasonable chance
for long-term survival.
Please feel free to contact me if you have questions regarding this report, or if further
discussion about any tree issue is required.
y~
J P~SpCIETY pF~p~
o C. Meserve ~o~ ~~~ ~~sF n,~
Member, American Society of Consul ng Arborists =~ ~o'Z' '~~, '~~
International Society of Arboriculture, WCISA #478 w ~ 78
z ~
m
~~ Sig ah;ie ~
~~7ED ARBQ~\~
~I
Individual Tree Evaluations
Sunny D Development
.Petaluma, Califoriza July 27, 2009
Tree #15 juglans regia (English walnut)
Trunk Diameter in Inches: 8+6+4 Height.in Feet t: 30
Number of Trunks: 3 Canopy Radius in Feet t: 10
Observations: '
Tree vigor is good; trunk exhibits minor decay; root collar appears~to have minor decay;
canopy structure is generally asymmetrical; habit is.dense; structurally weak; co-dominant
leaders present; watersprouts present; no significant pest or disease present.
Development Impacts:.
The impacts of development are unknown at this time because no residential footprint is
illustrated inside.the building envelope.
Recommendations:
This tree may or may not be preservable based on the actual location of the future home.
If the House location facilitates preservation, then implement the following protection and
mitigation measures:
1) Install temporary~proteetive fencing at the edge of illustrated dripline or the edge of
approved construction prior to grading on the site. Maintain fencing in place for duration
of construction.
Z) Maintain. existing. grade within the fenced portion of the dripline. Route drainage
swales and underground work outside the dripline where possible.
3) Prune to thin and reduce end weight per International Society of Arboriculture pruning
standards.
~Y
Sunny D Development
Page 3
Tree #17 Umbellularia californica (California bay)
Trunk Diameter in Inches: 16+16 Height-in Feet t: 40
Number of Trunks: 2 Cano~,y Radius in Feet t: 19
Observations:
Tree vigor;is good; trunk,exhibifs significant decay; root collar appears to have extensive
decay; canopy structures generally asymmetrical;'habit is dense; canopy is low branched;
structurally weak; co-dominant leaders present; watersprouts present; no significant pest
or disease present.
DevelopmentImpaets:
A minor impact on long term tree integrity can be expected as a result of proposed
development.
Recommendations:
This is a preservable tree. Implement the following mitigation measures to protect and
promote long term health:.
1) Install temporary protective fencing at the edge•of illustrated dripline or the edge of
approved construction.prior to grading on the site. Maintain fencing in place for duration
of construction.
2) Maintain existing grade within the fenced portion of the dripline. Route drainage
swales and underground work outside the' dripline where possible.
3) Place a 4" layer of.chippedbark mulch over the soil surface within the fenced dripline
prior to installing temporary fencing. Suitable mulch must contain bark 'fines'. Maintain
this layer of mulch throughout construction.
4) Prune to clean and reduce end weight of the canopy per International Society of
Arboriculture pruning standards.
~' 3
Sunny D ,Development
Page 5
Tree #19 Quercus agrifolia (coast live oak)
Trunk Diameter in Inches: 45.5 Height in Feet t: 50
Number of Trunks: 1 Canopy Radius in Feet ±: 36
Observations:
Tree vigor is fair; trunk condition appears to be sound; root crown appears to be sound;
canopy structure is generally symmetrical; habit is dense; canopy is low branched; no
significant pest present.
Development Impacts:.
A significant impact on long-term tree integrity can be expected as a result of storm drain
location near the base of the trunk.
Recommendations:
This appears to be~a preservable tree if he storm drain can be relocated to an area outside
the canopy dripline. Redesign the storm drain location and ,incorporate the following
protection and preservation measures:
1) Install temporary protective fencing at the edge of illustrated dripline or the edge of
approved construction prior. to grading on the site. Maintain fencing in place for duration
of construction.
2) Maintain existing grade' within he fenced portion of the dripline. Route drainage
swales and underground work outside the dripline where possible.
3) Place a 4"layer of clopped bark mulch over the soil surface within the fenced dripline
prior to installing temporaiyfencing. Suitable bark must contain bark "fines." Maintain
this layer of mulch throughout construction.
4) Prune to clean and raise the canopy per International Society of Arboriculture pruning
standards.
8`~
Sunny D Development
Page 7
Tree #21 Pinus pinea (Italian stone pine)
Trunk Diameter in Inches: 39 Height in Feet t: 50
Number of Trunks: 1 Cano~,y Radius in Feet t: 30
Observations:
Tree vigor is fair; trunk condition appears to be sound; root crown appears to be sound;
canopy structure is generally symmetrical; habit is dense; canopy is low branched;
structurally weak; co-dominant leaders present; no significant pest present.
Development Impacts:
A significant impact on long-term tree integrity can be expected as a result of storm drain
location near the base of'the trunk.
Recommendations:
This appears to be a preservable tree if the storm drain.can be, relocated to an area outside
the canopy dripline. Redesign the storm. drain location and'incorporate the following
protection and preservation measures:
1) Install temporary protective fencing at the edge of'illustrated dripline or the edge of
approved construction prior to grading on the site. Maintain fencing in place for duration
of construction.
2) Maintain existing grade`within the fenced portion of the dripline. Route drainage
swales and underground work outside the dripline where possible.
3) Place a 4" layer of chipped bark mulch over the soil surface within the fenced dripline
prior to installing temporary fencing. Suitable bark must contain bark "fines." Maintain
this layer of mulch throughout construction.
4) Prune to clean and raise'the canopy per International Society of Arboriculture pruning
standards.
5) Remove ivy from the trunk.
6) Minimize the depth of the. surface drainage Swale to no more than 8" and increase the
width as necessary.
7) Cable the two large co-dominant leaders together.
~5
Sun. ny D Development
Page 9
Tree #23 Quercus agrifolia (coast live oak)
Trunk Diameter in Inches: 27 Height in Feet t: 35
Number. of Trunks: 1 Canopy Radius in Feet t: 18
Observations:
Tree vigor is fair; trunk condition appears to be sound; root crown appears to be sound;
canopy structure is generally symmetrical; habit is dense; canopy is low branched; no
significant pest present.
Development Impacts:
A significant impact on`long-germ tree integrity can be expected as a result of storm drain
location near the base of the trunk.
Recommendations
This appears to be a preservable tree if the storm drain can be relocated to an area outside
the canopy dripline. Redesign the storm drain location and incorporate the following
protection and preservation measures:
1) Install temporary prgtective fencing at the edge of illustrated dripline or the edge of
approved construction prior to grading on the site. Maintain: fencing in place for duration
of construction.
2) Maintain existing .glade within the,fenced portion of the dripline. Route drainage
swales and underground work outside the dripline where possible.
3) Place. a 4"layer of:chipped bark mulch over'the soil surface within the fenced dripline
prior to installing temporary fencing. Suitable bark must contain bark "fines." Maintain
this layer of mulch throughout construction.
4) Prune to clean and raise the canopy per International Society of Arboriculture pruning
standards.
5) Rernove;ivy from the trunk.
6) Minimize the depth of the surface drainage Swale to no more than 8" and increase the
width as necessary.
~~
Sunny~D Development
Page 11
Tree#25 Juglans regia `(English walnut)
Trunk Diameter in Inches: 19 Height in Feet t: 15
Number of Trunks: 1 ~ Canopy Radius inFeet t: 12
Observations:
Tree vigor is fair; trunk condition appears to be sound; .root crown appears to be sound;
canopy structure is generall'y~symmetrical; habit is dense; canopy is low branched; recently
topped; no significant pest present.
Development Impacts:
A significant impact on long-term tree integrity can be expected as a result of location
immediately in front of the proposed driveway stub.
Recommendations:.
Removal required due to significant development impacts.
~~
Sunny D Development
Page 13
Tree #27 juglans regia (English walnut)
Trunk Diameter in Inches: 11 Height in Feet t: 15
Number of.Truriks: 1 Canopy Radius in Feet t: 12
Observations:
Tree vigor is fair; trunk eondition;appears to be sound; root crown appears to be sound;
canopy structure'is generally symmetrical; habit. is dense; canopy is low branched; no
significant pest present.
Development `Impacts:
A minor impact on orig-term tree integrity canoe expected as a result of proposed
development.
Recommendations:
This is a preservable tree. Implement-the following mitigation measures to protect and
promote longterm health:
1) Install tem orar rotective fencin at th
PP P y p p g g e edge of illustrated dripline or the edge of
a roved construction nor to- radin on the site. Maintain fencing in place for duration
of construction.
2) Maintain.existirig grade within the fenced portion:of the dripline. Route drainage
swales and underground_woric outside the dripline where possible.
3) Place a 4" layer of chipped bark mulch over the soil surface within the fenced dripline
prior to installing temporary fencing: Suitable barkmust contain bark "fines." Maintain
this layer of mulch throughout construction.
4) Prune to clean and raise the. canopy per International Society of Arboriculture pruning
standards.
5) The root, collards-:compromised by decay, review again after the Home's location has
been determined fo see if a hazard might be~present.
Sn
Sunny D Development
Page 15
Tree #29 Quercus agrifolia (coast live oak) .
Trunk Diameter in Inches: 16.5 Height in Feet t: 25
Number-. of Trunks: 1 Canopy Radius in Feet t: 18
Observations:
Tree vigor is fair; trunk condition appears to be sound; root' crown appears to be sound;.
canopy structure is generally.symmetrical; habit is dense; canopy is low branched; no
significant pest present.
.Development .Impacts:
A mirio"r irnpact.on long-term tree integrity can be expected as a result of proposed
development.
Recommendations:
This is a preservable tree. Implement the following mitigation measures to protect and
promote long term health:
1) Install temporaryprotective fencing at the edge of illustrated dripline or the edge of
approved construction prior to grading bn the site. Maintain fencing in place for duration
of construction.
2) Maintain existing grade within the fenced portion of the dripline: Route drainage
swales and underground work outside the dripline where possible.
3) Place a 4' layer of chipped bark mulch over the 5oi1 surface within the fenced dripline
prior to installing temporary fencing. Suitable bark must contain bark "Pines." Maintain
this layer of mulch throughout construction.
4) Prune to clean and raise the canopy per International Society of Arboriculture pruning
standards. .
5) Remove, ivy from. the trunk.
8`~
Sunny D Development
.Page 17
Tree #31 Quercus agrifolia (coast live oak)
Trunk Diameter in Inches: t 15 Height in Feet. t: 25
Number of Trunks: 1 Canopy Radius in Feet t: 16
Observations:.
Tree vigor is fair to .good; trunk condition appearsto besound; root crown appears to be
sound; canopy structure is generally asymmetrical; habit is open; canopy is low branched;
no significant pest present. This tree is off site.
Development Impacts:
A minor impact on long-term. tree integrity can be expected as a result of proposed
development.
Recommendations:
This is a preservable tree. Implement the following mitigation measures to protect and
promote long terrx-,health:
1) Install temporary proteefiive fencing at the edge of illustrated dripline or the edge of
approved construction-prior to grading on the site. Maintain fencing in place for duration
of construction.
2) Maintain existing grade within the fenced portion of the. dripline. Route drainage
swalesand underground work outside the dripline where possible.
3) Place a 4" layer of chipped bark mulch over the soil. surface within the fenced dripline
prior to installing temporary fencing: Suitable bark must contain bark "fines." Maintain
this layer of mulch throughout construction.
4) Prune to clean and. raise the canopy per International Society of Arboriculture pruning
standards.
~D
Sunny D Development
Page 19
Tree #33 Malus (apple)
Trunk Diameter.. in Inches: 6 Height in Feet t: 12
Number of Trunks: 1 Canopy Radius in Feet t: 10
Observations:
Tree vigor is fair; trunk condition appears to be sound; root crown appears to be sound;
canopy structure is generally symmetrical; habit is dense; canopy is low branched; no
significant pest present.
Development Impacts:
A significant impacYmay occur as a result of proposed surface drainage swale. Tree
location on the map is not precise.
Recommendations:
This appears to be a preservable tree if the drainage swale can meander away from the
trunk. This can be accomplished in the field of the time of construction. Incorporate the
following protection and preservation measures:
1") Install temporary protective fencing at the edge of illustrated dripline or the edge of
approved construction prior to grading on the site. "Maintain fencing in place for duration
of construction.
2) Maintain existing grade within the fenced portion of the dripline. Route drainage
swales and- underground work outside the dripline where'possible.
3) Place a 4" layer of chipped bark mulch over the soil surface within the fenced dripline
prior to installing temporary" fencing. Suitable bark must contain bark "fines." Maintain
this layer of mulch throughout construction.
4) Prune to clean the canopy per International Society of Arboriculture pruning standards.
~l
Sunny D Development
Page 21
Tree #35 Juglans regia (English walnut)
Trunk Diameter in`Inches: 10+6.5
Number offirunks: 2
Heieht in Feet t: 25
Cano~y Radius in Feet t: 12
Observations:
Tree vigor is fair; trunk condition appears to be ound; root crown appears to be sound;
canopy structure is generally symmetrical; habit is dense; canopy is low branched; no
significant pest present.
Development Impacts:-
A minor impact on'long-term tree integrity can be expected as a result of proposed
development.
Recommendations:
This is a preservable: tree. Implement the following•mitigation measures to protect and
promote longterm health:
1) Install temporary protecttive fencing at the edge~of illustrated dripline or the edge of
approved construction prior to grading on the site. Maintain fencing in place for duration
of construction.
2) Maintain existing grade w, ithin the fenced portion of the: dripline. Route drainage
swales and underground work outside the dripline where possible.
3) Place a 4" aver of chipped bark mulch over the soil surfacewithin the fenced dripline
prior`to installing. temporary fencing. Suitable bark must contain bark "fines." Maintain
this layer of mulch. throughout construction.
4) Prune to clean the canopyper International Society of Arboriculture pruning standards.
~~
'TREE .L®CATI~l~T 1'L.P~N
3
CITY OF l~ETALUMA, CALIFORNIA
STAFF P®1~T
Community Development Department, Planning Division, 11 English Street, Petaluma, CA 94952
(707) 7.78=4301 Fax (70.7) 778-4498 E-mail: planning a)cipetaluma.ca.us
DATE: January 12, 2010
TO: Planning Commission
FROM: Tiffany Robbe; Senior Planner
REVIEWED BY: Geoff Bradley; .Planning Manager
SUBJECT: Sunny DProposal -Water Supply and Demand Update
This memorandum provides an update to the water supply information in the Initial Study for the
Sunny D project,. and does not identify any new or more significant water supply impacts than
discussed in the Initial Study/Mtgated Negative Declaration.
Background
The EIR certified for the City of Petaluma General Plan 2025 in May, 2008 relied on the General
Plan 2025 Water Demand and Supply Analysis (Dodson, July 2005; Technical Appendix, Vol. 2)
and other referenced information. to conclude that sufficient water supplies will be available to
serve the city through general plan buildout in 2025.
At the time of evaluation of water supply for development projects, it is necessary to identify and
evaluate whether water to serve the project ~ and future demand. is reasonably likely to be
available, pursuant to the opinion of the California Supreme Court in Vineyard Area Citizens for
Responsible Growth et al.. v. City of Rancho Cordova et al. (2007) 40 Cal.4`h 412 ("Vineyard')
and subsequent cases interpreting Vinegar, d, such as Santa Clarita Organization for Planning the
Environment, et al., v. County of Los. Angeles, et al. (200.7)156 Cal.App.4`h 149. Vineyard
requires that. an environmental- evaluation for a land use project must address the prospects of
likely future water sources, and its discussion must include a reasoned. analysis of the
circumstances affecting the likelihood of the water's. availability. Speculative sources and
unrealistic allocations. ("paper water") are insufficient. However, Vineyard does not require
guaranteed sources,. or even. the existence of signed and enforceable agreements from. water
suppliers or akeady built or approved treatment and delivery facilities, at least for future phases
of long range development.
The General Plan 2025 water demand and supply analysis showed that sufficient water would be
available for long range development through 2025, given the total estimated future population,
land use, and estimated water demand, the City's existing water supply contract with the Sonoma
County Water Agency (SCWA), and planned City water recycling and water .conservation
programs.
~`f
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°upcomng demands as provided by the applicant.
C. The City shall maintain a tiered development record to monitor
approved and pending project developments to allow a reasonable forecast of
projected water demand.'
The -Water Supply and Demand Analysis Report. (June 2006) developed a water supply program
that relies upon water from SCWA, recycled water (potable offset), conservation, and an
increment of groundwater at buildout to meet projected demand. As noted in General Plan 2025
Policies 8-P-5-C .and 8-P-19, 'the City also anticipated continuing. use of groundwater to meet
emergency needs and to .offset peak. demands. Per Policy 8-P-4 of the Petaluma General Plan
2025, city staff is required to monitor actual demand for potable water in comparison to the
supply and demand projections in the Water Supply and Demand Analysis Report. Staff has
compared actual demand for potable water to an annual SCWA supply limit for Petaluma of
4,366 million gallons per year (13,400 acre-feet) and a peak .supply limit of 17.1 million gallons
per day. In both instances; potable demand. is well within ,available SCWA supply capacity.
Tiered water rates, conservation efforts, and the conversion of Rooster Run Golf Course to
recycled water have kept annual and peak demands within the available SCWA .supply at
approximately 3,200 million .gallons per year and an average day maximum month peak demand
of 12.3 million gallons per day, respectively, in 2008. Use through September; 2009, was even
lower, reflecting significantly increased, water conservation during the peak summer months of
..2009. Monitoring in future years will evaluate the extent to which the 20091eve1 of conservation
is sustainable. The present water derrand monitoring does not use the 2009 demand numbers
because it is not clear if the 20091eve1 of conservation will be sustained in future years.
Staff has also reviewed the projected demand of entitled "projects and proposed projects
compared to available supply as of October 1, 2009. Entitled projects are defined as approved
projects that are either under construction or yet to be constructed. Proposed projects are those
projects which are undergoing discretionary review as of October 1, 2009,. and include the
proposed Project. When all proposed projects are added to the actual demands .for 2008,
resulting aggregate .demand of 3;449` million gallons per year and average day maximum month
peak demand of 13.4 million.. gallons. per day remains well within the available SCWA supply of
4,366 million gallons per .year and peak supply of 17.1 million gallons per day evaluated in
General Plan 2025.
Long term supply for buildout relies on the continued implementation of various phases of the
City's recycled water program and water conservation programs to offset potable water use.
Those programs are analyzed in General Plan 2025 with estimated dates for implementation.
The General Plan 2025 monitoring policies outlined above will continue to track the contribution
of these programs to the supply and demand balance. General Plan Policy 8-P-4.A is a further -
limitatioa on approval of development to ensure that an adequate water supply is in place at the
time of any future project entitlement..
NMFS Biological ®pinion-September 24, 200.8
The 2008 Biological Opinion analyzes the continued operation. of the Russian River Water
Supply and Flood Control Project fora 15 year period on endangered salmonid species. As it
relates to Petaluma's water supply, the project includes 'Warm Springs Dam and SCWA's
activities related to flood control, water diversion and storage and regulation of flows in the
.Russian River and Dry Creek, as well as SCWA activities related to Lake Mendocino. Because
resolution stated that SCWA estimates its Yransmission system deliveries will be approximately
54,500 AF' for Fiscal Year 2009-2010 because of the .shut down.
On June 16, 2009, S'CWA's board of directors approved a "Temporary Allocation of Water
Supplies" to SCWA customers including the' City of Petaluma, for the period June 15 to October
2, 2009, in response to its Resolution No: 09-074. On May 29, 2009 the State Water Resources
Control Board issued Order WR2009-0034-EXEC (Order) d in response to SCWA's petition to
reduce required instream Russian River flows to prevent the depletion of storage in Lake
Mendocino. The Order required 'SCWA to reduce Russian River :diversions 25% between June
15 and October 2, 2009, compared to 2004 diversions. The Temporary Allocation adopted by
SCWA on June 16, 2009, provided Petaluma with 9.3 million gallons per day, or approximately
886 acre feet per month between June 15 and October 2; 2009; but has now expired. The City
met the amount of peak demand, not provided by SCWA between June 15 and October 2, 2009,
with conservation and pumping of groundwater for the duration of the reduced allocation. Use
of the city's groundwater wells to meet emergencies and peak demand is provided for in General
Plan 2025 Policies 8-P-5-C and 8-P-19.
Under the Restructured Agreement,. Part 4, SCWA sets its annual charges to the water
contractors. Its budget is based in part on assumptions about. quantity of water to be delivered
under the Restructured Agreement.. .For purposes of rate-setting, modification of that quantity
when prior year's supplies are':not predictive of future usage, requires the prior approval of the
Water Advisory Committee; .made up of representatives of 'each water contractor. See
Restructured Agreement, Section- 4.1(c). Petaluma and the eight other water contractors will
thus have input into SCWA charges,, rates and. the resulting budget and production goals for FY
2010-2011 and subsequent years. The City thus has the ability, through its membership in the
Water Advisory Committee,. to help ensure that SCWA budgets and production goals are
consistent with water supply requirements relied upon by the 2025 General Plan.
Conclusion
None of -the circumstances discussed above constitutes (1) substantial evidence of a change in the
project which involves new significant effects on water demand/supply or a substantial increase
in severity of previously identified effects; (2) substantial changes in circumstances under which
the project is undertaken which will lead to new significant effects on water demand/supply or a
substantial increase in the severity of previously identified effects relative to that supply; or (3)
new information of substantial importance which was not known and could not have been known
at the time of the General Plan EIR and. which shows one or :more significant effects not
previously discussed or substantially more severe significant effects than previously examined
relating to water supply for the Project than as evaluated in the General-Plan 2025 EIR.
~~