HomeMy WebLinkAboutStaff Report 03/26/2001 (28) : • ,
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AGENDA ITEM TRANSMITTAL REPORT (I
:DEPARTMENT:, ,.:SUE3MITTED!BY: , I.
Sonoma County Water Agency .. Randy D. Poole _ ,. ,
11FORBOARDACTION ON 03112-9-01, - AS: ' - • CONSENT (- ,) REGULAR
THIS ITEM. REQUIRES.; (Check appropriatetoxes).
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' ( ) Hearing, • _ ( ) 415 Vote
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, ( ) Requests Gold IResoltition ( ) Appropriation Transfer
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. ( ) Public Appearance Aritidipated - ( )- Position Alloc List Change(s) .
( X ) 'County Counsel Approval Date' ;- 1:27 //,/ By:
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AGENDA SHORT TITLE: , • — 1 . -
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Operational Risks With the Petalumaikquethibt
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REQUESTED BOARD ACTION - •• . •.-,
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Approve resolution (1) directing theiGeneral-MaTiagei-/Chief Engineer of the SondrnaiCounty Wateg Agency to
notifY the Department of Health SetvideS ind elected officialsof the Peialurhai Aqueduct water customers of
risks associated with operation of the Petaluma Aqueduct; (2) directing the General Manager/Chief Engineer ..
to work with the Petaluma Aqueduct;vveter Customers to identity measures to reduce demands on the .
Petaluma Aqueduct; and (3) directing the General Manager/Chief Ehgineer to report back to thiBotafd in early • ' -
'summer 2001 regarding the status of the:Petaluma'Aqueduct And operating conditions to determine a need to
•declare Stage II or higher (mandatorykonservation efforts. • -.- •• I
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' • Signature of Department Head
.- . Special Instructicins`to Clerk of the Board: . ' •
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• FORAGENDA COMMITTEE,USE I ,
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County Administrator's Office Recommendation: ' '
( ) Approval, ( ) , Submitted with Comment I .-
( ) • Not Recommended ( )' Policy Determination by Board
Analyst Comment: '
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. . . . Signature of County.Administratoi.
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.Agenda Committee Action . -
( ) Consent Calendar • -. . - Date Scheduled: / / I
( ) Regular Calehdy, Time Scheduled:. • -
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(If required)I:\u\cl\agedda\misc\petaluma aqueduct operatonensks.doc ' FILE:WC/60-2-1 PETALUMA AQUEDUCT
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Clerk of the Board Use Only
COUNTY OF 'SONOMA Meeting',Date Held Until •
AGENDA ITEM - _/_/_ _/_/__ _
Agenda item No Agenda Item No
SUIV MARY REPORT
Department: Sonoma County Water Agency (. ) 4/5•Vote`Required
Contact: Phone: Board Date: Deadline;for Beard:Action':
Randy D: Poole 526-5370 03-20-01
AGENDArSHORT TITLE: . •
Operational'Risks with•therPetaluma Aqueduct - •
REQUESTED;BOARD�ACT,ION:
pP e resolution f9 i 9 lg Count;
Water,Cos:
td n ti Y'the DeP artme t oHealthServi esand ele ted officials of the Petaluma A q ueduct Water cu stomers
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. of risks P associated with Operation of the Petaluma Aqueduct (2) directing the Generel,:,Manager/Chief ' •
•Engineer to workk;with the Petaluma Aqueduct water customers to identify various measures to reduce •
den-lands-on the Petaluma Aqueduct;and (3) directing the General Manager/Chief Engineer to•reportEback to,, -
,,,, the;Board:in earlyisummer42001 .regarding the status of the Petaluma,Aqueduct,and operating..conditions;to. .
determine a need to declare Stage II or higher (mandatory),conservation?.efforts.. •
CURRENT FISCAL YEAR;FINANCIAL IMPACT
EXPENDITURES" • - ADD'L FUNDS'REQUIRING:BOARD APPROVAL
•Estimated Cost $ Contingencies S. '
(Fund Name: )
Amount'Budgeted $ Unanticipated Revenue $
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Other Avail Approp $ Other'T,ransfer(s) $
(Explain below) (Source: ) ,
' Additional Requested: $ Add'I Funds,Requested:; $
Explanation4if required):
Pri o rBOard;Attion(S)
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Alternatives - Results of Nor-Approval::
'The General Ma-lager/Chief:Engineer would;not liaVe<Board direction;on this issuer,
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Background:
The Sonoma County Water Agency eyA en has nottbeen able to meet peak deP ands on theiPetaluma
Aqueduct since 109P.;. The A enc 'anticipates this situation.to continue until;'Permanent facilities are
. installed'to address "growing demands and peaking issues. To; address peaking issues and other times
when the Agency may not be "able to meet,'the,waterdemendsi of the;,Petaluma-Aqueduct customers,
Agency prepared"the attached'.Report on the Operational Risks Associated with the.Petaluma;Aqueduct.
Report (Al). A summary-of attached;report's,findings and recommendations>are;described below.
Analysis -•
aqueduct is also vulnerable to .its design
ca as during 9 periods:. p y 9 y
The Petaluma Aqueduct particularly the ortion south of EI Booster ,Station, is operating at
p ty g peak summer In addition,. this echanical;
structural, and electrical outages 'that could substantiall . reduce A enc s ability to deliver)water to
customers served.:from this aqueduct. . . • 1
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The Agency must construct two parallel systems consistingof';two new aqueducts, one from the Cotati
Tanks to the Ely Booster Station and.onefromthe Ely Booster Station to Kastania Tanks, as contemplated
•by the Water Supply and Transmission System Project°(WSTSP) to meet demands:during peak periods.
The Eleventh Amended;Agreement for Water Supply, which authorizes construction of these facilities, was
not approved until January .2001.. The Agency must'. complete a project specific EIR for the parallel
'aqueducts and implement appropriate funding mechanisms,before the projett can be constructed: It is'
anticipated that the parallel 1aqueducts from the Cotati Tanksto Kastania`Tank will,:not1be completed until
2007 at the earliest, assuming adequate funding can beaecured n a timely"manner: 1 -
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i-hr If outages on .'they Petaluma Aqueduct occur, due to mechanical, electrical, or structural problems, the
v ;Agency's water'supply to 'Petaluma Aqueduct water customers could 'be limited to available) storage, ,
lx , restricted to indoor water use, or"significantly curtailed The_Agency:and water contractors"�set forth
allocations"for the monthsvofjJune,-=September in the Memorandum of Understanding Regarding Water
•,; ,Transmission System,Capacity Allocation During-Temporary Impairment, but these allocations assumed all
*equipment is operating properly„ no power outages, and peak demands below the capacity of the
aqueduct..Additional measures taken by, the Petaluma Aqueduct:water,customers are needed td.address
such outages and excessive demands. I
Recommendations: -
'Because of these issues, the report"contains:the"following actions which we are recommending that the .
Board of Directors (Board) direct the`General Manager/Chief Engineer.to;do: _•
(1)" Notify the Department Of Health Services andelected officials responsible•for the communities .
served by the Petaluma Aqueduct of its capacity limitations and :vulnerability. Ask that such
officials adopt and implement water conservation• ordinances and measures as needed and
' encourage these. policy ;makers to accelerate ,efforts to reduce.demands on the Agency's
- system', including increasing recycled wateriuse". I
(2)_Work with the Petaluma! Aqueduct water customers tot identify .various measures to reduce
demands and vulnerability impacts on the Petaluma Aqueduct This would include developing
operationaltprocedures and.mandatory.conservation efforts. •
(3) Report back to the Board in.early summer 2001 regarding the:statusof'the Petaluma Aqueduct
and operating conditions:to determine`if Stage II orhigher (mandatory) conservation efforts are
needed:: ' t I
Attachments: Resolution (R1); Report on the Operational;Risks Associated with the Petaluma°Aqueduct(Al)
On.File.With Clerk: I
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tCLERK OFTHE BOARD'USE:;ONLY
Board Action (If other than "Requested") Vote:
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• Resolution No.
County Administration;Bldg.
Santa'Rosa,CA •
Date:
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RESOLUTION OF THE BOARD OFDIRECTORS'OF THE SONOMA,COUNTYWATER
• AGENCY (1) DIRECTING THE-GENERAL MANAGER/CHIEF ,ENGINEER'OF THE
SOIOMA COUNTY WATER AGENCY TO NOTIFY THE DEPARTMENT HEALTH
SERVICES AND 'ELECTED OFFICIALS OF THE PETALUMA AQUEDUCT“WATER
•CUSTOMERS OF RISKS ASSOCIATED WITH OPERATION OF THE. PETALUMA
• AQUEDUCT; (2) DIRECTING, THE GENERAL. 'MANAGER/CHIEF' ENGINEER. TO
'WORK WITH THE PETALUA4 AQUEDUCT. WATER CUSTOMERS TO ?IDENTIFY
VARIOUS' MEASURES TO REDUCE DEMANDS ON THE 'PETALUMA,AQUEDUCT .
(3j DIRECTING T,I-fE GENERAL 'MANAGER/CHIEFENGINEER TO REPORT BACK'
TO, THE ,BOARD•,IN. EARLY SUMMER :2001 REGARDING 'THE;STATUS OF THE
PETALUMA,AQ_UEDUCT'AND.OPERATING CONDITIONS TO DETERMINE,A NEED
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.;, • TO-DECLARE STAGE;II OR HIGHER (MANDATQR■ j CONSERVATION EFFORTS;
(4) DIRECTING'THE GENERAL.MANAGER/CHIEF ENGINEER TO EVALUATE THE ..
POTENTIAL TOINSTALL AUXILIARY POWER AT'ELY BOOSTER STATION;;AND'(5)'
. DIRECTING THE, GENERAL MANAGER/CHIEF. ENGINEER. TO EXPEDITE THE
CONSTRUCTION OF NEW FACILITIES, INCLUDING PARALLEL AQUEDUCTS, TO
SERVE PETALUMA.AQUEDUCT CUSTOMERS:
WHEREAS; demands_on .the, Petaluma .Aqueduct`approach or exceed capacity during,.certe
peak penods.:and r.
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WHEREAS, demand's'along,the Petaluma Aqueduct are expected to continue to.increase on a
yearly basis; and
WHEREAS, the Petaluma Aqueduct may suffer from mechanical;,structural, or electrical outa9es
that could result in significant restrictions on the amount of water the,S,onoina'CountyWater Agency is
ableto'deliver fromtthe Petaluma Aqueduct; resuitin g in insufficierjtsuppliesfor',healthand saf2ty; and
WHEREAS; structural'measures`to'increase'thedeliverycapacity of;the;Petaluma'Aqueduct.may
not be available for five years:or rnore,iand
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WHEREAS, cooperation of Petaluma Aqueduct water customers-to implement demand-side
measures,such.as water conservation ordinances and increased recycled'water`use-are necessary to
educe,the impacts bf these restrictions; and
WHEREAS, mandatory conservation measures.may.be;needed'tolprotect water,supplies for publio
heath and safety:
- FILE:wc/6o-2=.i;PEtA i 4AAGUE
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.NOW, THERE.FORE;•BE.it RESQLyED that the.Boardpf bireclors of the Sonoma County Water.
. Agency hereby finds, determines, andbeclareeaefolloWs: . ,
a, 1. All or theadove recitals are true and correct ' i
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2. The General manager/Chief 'Engineer of the Sonoma- County. Water Agency is hereby
directed to notify the California. Department of Health'. Services, and elected officials
responsible for the communities served by the Petaluma Aqueduct of its capacity
iirriitations and aelt.'sUoh officials adopt and implement water conservation ordinances,and
' measures needed to encourage these policy makers to accelerate efforts: to reduce
demands the Agency's system, including increasing acybred water use
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3: The'General Manager/Chief Engineer is ,directed to work with-Petaluma Aqueduct water _
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customers tO identify various measures to reduce demands on the-Petaluma; Aqueduct,
, including de-yapping operating prodedureS and Mandatory Water conservation Ordinances.
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4. The General Manager/Chief Engineer is directed to report back to the Board of Directors in ' g
early summer.2001 dn the status of the Petaluma,Aqueduct and operating conditions to
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determine it Stage !! or higher (mandatory) conservationeffortsare needed.
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' • .t)14",,I,,4i,ii''-';:- ' 'a: The General Manager/Chief Engineer is directed to evaluate the potential to install '•,,i
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,w...: auxiliary power atElyBooster Station to protect againSt,poWer,outageS.,
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6. To the!extent_possible, the General' Manager/thief Engineer is directed to expedite the
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construction of.;new,facillues., including parallel''aqueducts, to serve Petaluma Aqueduct -- 1
customers. , • - . ..___ it.,
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"DIRECTORS:
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CALE KERNS kFILLEY, REILLY SMITH
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Ayes Noes. Abeent Abstain . .,
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JRepott- on the Operational Risks Associated • •
Associated d .
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with the. P.
eahioa Aq ueduc_t .
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• Summary . • . . .
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The Petaluma Aqueduct, particularly the portion south of Ely Booster StatiOn;-, is.oPerating, at
capacity Burin peak-demand surffiner deriodk, In addition; the Petaluma Aqueduct is
vulnerable,td rneehariical";,, structural, and electrical outages, which could reduce delivery
capacity for extended periods, Jeopardizing public.health;;and-safely. Until parallel edUedUdta, •
are constructed from Cotati Tanks to Kastania Tank , thesituation will continu0o worsen as
- demands', on the Petaluma Aqueduct increase, Demand reducing measures operating
Procedures are needed fdprotectither,plidlidinthemeantifne.
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Petaluma Aqueduct Description
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. The Petafunia Aqueduct provides water to the cities of Rohnert Park, Cotati, and Petaluma,
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Penngrove Water Cdindany, North:Marin Water District (NMWD), and'Mann Municipal Water
. , . Difitript.(iviMVVP).: There are ,a few surplus water users on the Petaluma Aqueduct, however
their Uae is iietithiall and does not affect the peak-Ute.:prOhlem:
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The Petalurna.Aqueduct is supplied fromrthe ,Russian River-Cotati ,Intertie '(S0fati Intertie) and
the'Santa Rosa Aqueduct The PatalumeAquedual runs from Wilfred Booster Station, south io
of'Santa Rosa,to Kastania Meter,Station:ds:9'6th of FetalUma. The Petaluma Aqueduct, which
was constructed in 1962, is a 24-inch transmission main from Wilfred Booster Station to the -
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Cotati Intertie, The lbetalufna Aqueduct then;increases to a 33-inch transmission main from
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the Cotati Intertieto the Mthear nieterAiri Petaluma, then reduces to a 30-inch main from there
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to the Kastania Meter. (See attached map.)
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The atbfage along•the• Pethlunit.Aqueduct consists of 36' million gellonepp) :arthe Cotati'
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• Tankeand 12 Mdat Kastania Tank.
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Thepy•BoosterStation,;corittrueted:in 1985,,,is.locatedadjacent,to"the:4orth WeetPacifid:Rail:
'.Road South of Ely pbad, The booster station waecfesighed to increase delivenesto Petaluma -
and „North Marin Water District This bodater. station,containetwo 560 HP pumps which are •
designed topfovide31.8kniillionigallons per day (mgd) to southern portion of the Petaluma . .
. - Aqueduct The station is normally operated with;both, pumps either off or '60.- . Flows in the •
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Petaluma Aqueduct south of;Ely-Bdoeter'StatioMaraapproximately 33 mgd t with both pumps at
ElSi, Bobeter Station on, 25 mgd with one pump ,on, and approSimately. 18- 0 mgd with no
•pumpexon.1
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- The engineered design. pressure of the Petaluma Aqueduct, including, hydracilic. surge
protedtiOn, is 150 psi. When both purnds,are operating at Boostef•Statiorrtheidiadharge
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pressure is 140 psi. The design velocity O?fherpiPalineprior to the,construction of Ely Booster
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Station, Was 47 feet !per second. However; during purnp. .power failures (transient surge
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1' The values..dft.33litgd:and 18';20 ingd.werelpalculated*ing:run times of Ely Bobater Station and the
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billing records for June, July and'August,of.190,•durifig peak',flowson..theaddedudr. The southern •
portion of the PettlUi-narAgriedDat is designed for 18:2,mgclt.intithout,purrips:bripet as-builts).- f he*value
0125 mgd is tiased On pump curves for pyiBooster Station. t;ic.rheterihgTdata.it 6C/enable,:
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pressures significantly exceed this value Maximum velocity in the;pipeline`is estimated at 8.6
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feet per second for most.of the reach when flows are-33 mgd- ,Velocity in the Ely Booster
• Station meter pit'is' 104%•feet per second under similar conditions It should be notedi that
_ normal operating design velocities for.water:systems is generally'in the,range of:3 to 5 feet per
second, which is substantially less'theh:the above velocities:,
System Reliability.Issues
The Petaluma Aqueduct is vulnerable to mechanical; electrical, and•structural.outages. 'The •
Petaluma Aqueduct depends on Ely:'Booster Station to provide'water to Petaluma, NM ND,
and MMWD wherfdemands„exceed 18 to 20 mgd Prior 2000; demands on the Petaluma
Aqueduct were typically below 20 mgd from November through March: In 2000, due to
increased delivenesto MMWD, -average monthly demands from theseithree users were above
20 mgd for mostofahe year:; ,
- Although the Sonoma County•Water Agency (Agency) maintains*spare,spare pump and motot for
• Ely Booster'Station, thisstatiOn•is still`vulnerable,to-prolonged outages from failing mechanical
parts- 'In the winters of,2000 and 2001`,,_part of all of Ely(Booster'Station was out of service-for "
a prolonged;period"because,dral oral failed part- .111.2060;ithiSiletr to low storage levels in Kastania
Tank Although"the Agency has experienced a prolonged.,outage to one•of the pumps;jthis
winter, the Agency:has been "able !tor maintain levels in •Kastania Tank using one pump. It is
anticipated that the pump will be•rebuilt and installed by the time spring demands 'increase. -
Howeyer, the Agency may hotFbe able to,meet its,max inum 'delivery obligations)south of Ely
Booster if the 'second'pump becomes inoperable .
Ely Booster Station, like most of the Agency's booster stations, does.not currently have backup
power and is therefore vulnerable+to electrical.outages The booster station is also:subject;to
-rolling power blackouts fromPaclfic''Gas and Electric Company (PG&E). ,Sosferthis year,
Booster Station has>been part;of one,rotating outage for approximately'twat hours:- With the •
current•energy crisis.in California, power outages<are likely to per more frequent and longer.
PG&E has notified the A9ency.that12-hour per`day blackouts-could occur this summer if the .
current energy problem is not addressed: If"such an outage°occurred, the Agency would only
be able ,to deliver a,maximum of 26 ±to 27 mgd to the southern' portion: of the Petaluma
Aqueduct; which is approximately 80% 'of the projected;summer demands for the next two
years- Since peak energy use, usually corresponds to peak summertime!demands, it is likely
that storage, in Kastanie Tank could: deplete to critical 'levels during a blackout, with little i
chance of recoGery if demands;;+:were not:;decreased.
Providing a.b.-kilay powerto Ely`Booster;Station will cost.approximately $250,000 to retrofit the
booster 'station- This does. ,not include the cost of:rentin
- ' - . g a 'truck-mounted generator.
' Additional environmental work, right ofway,and permitting may,also:be required. The Agency
is proceeding with"this,work, assuming,.there will be support from the water contractorsi to
expend such funds. ,
The Petaluma Aqueduct is approximately 40 years"old and is vulnerable•to structural failures.
Current velocities of'approxuimately 9 feetper second in the pipeline'are above normal industry
• maximums when Ely Booster isvirunning. The design'velocities,prior to the construction •
of Ely Booster Statwn:was 4;7 feet per second. Normot operating pressures-in the pipeline are r.
within 10 psi of the maximum rated pressure of the pipe. Transient pressure surges in the
pipelines due to•peweroutages could`deuse the pipeto fail. The•Petaluma Aqueduct,does not
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have
ale failure Ilel pipeline south of El Booster,Station to provide Water'in Case a.transmission -
P PP y p •
The impactsaf an outage due to mechanical, electrical,.or structural problema.greatly depends:
on the`duration of the outa e, impacts s to Ely Booster,Station, and demands'for the duration of .
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thedooawat A prolo gedtoutage Nt the Ely Booster Station would likely requirera restriction on >
NMWD, and MMWD,-unless local stbrageiand.supplies could
make up the difference., 'Power outages, as described above, would require• 0% mandatory
ductions in water use. If a.break in the Petaluma Aqueduct occurred south of the Cotati ,
lntertie, total deliveries would be- limited the •available storage in Kastania Tank,2,1:2 MG,
aximum),,,`which is about;eight hours during peak'demands. - ' . `
As -part of the Memorandum of :Understanding Regarding ,Water Transmission °iSystem
Capacity Allocation „During• Temporary Impairment (MOU), the Agency_and ,ten of its water ,.
customersiagree that a,desirable standard,for standby:local peak month production acapacrty,is$ - r
approximately 40% of peak demand Thiais desirable to copewith severe droughts and water i€,
shortages caused by=spills of toxic materials, water quality".contamination, narthquakes,slides'•': ,.
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and other unpredictabte,events.• Most ofthe watercustomers along the Petaluma Aqueduct do3s ,
not_havezthiilleve of production capacify;,as,described laterin)this report` Cri4A r
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Petaluma>Aqueduct Maximum.Deliver@Obligations t
- 'Section 3::1(a) of the Eleventh Amended Agreement for Water Supply•(Eleventh Amended;
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Agreement) sets forth'the maximum delivery,obligations of'the, Agency in• terms of maximum'
average monthly>rates of delivery entitlement inmgd+for each of the water contractors. The: . •.
. delivery entittlements;for each .of`the water contractorsr.and:other Agency.customers along the
Petaluma Aqueduct is shown.in,the table below: . ' .
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• . table I — Customer Entitlement.pm the%Petaluma Aqueduct
.. - _Contractor,or Other Agency Customer' 'Entitlement.(ingd). ' _
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Petaluma 21.8 .
'North Marin,WaterDistrict_._ 19.9
Cotati' - 3:8
Rohnert Park, 15.0 •
Other Agency:Customers_
Total Delivery Obligation ' , 61.0
MMWD 7:43
Obligations Including Deliveries --: '.68.4 - '
• • . -Petaluma Aqueduct Capacity..and°.Demands is ,,. •4.AsNshown above, the Agency's maximum delivery: obligation is 61.0 mgd under the Eleventh
Amended Agreement plus•an additional 7.4,m d to MMWD'when ca eCi
9 p ty is available:onnthe
.a-p stJ, t'± #.".Y '%/n .�cF F. '-s L fir,'fi��
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The delivery limit to"otherAgency'customers from:the Petaluma aqueduct south ofthe Interhe a ` 214. _•o--
aqueduct istestabhshed by Section3:2(c) of the Eleventh'Amended Agreement as 0 5'mgd W
The Agency has executed 'two agreements with MMWD to provide water MMWD IS-limited inane
water, it can take the five-month;period.of May 1 through,September 30. The Agency is not obligated to',
.make these deliveries if there ate shortabes of•water'in theipussian.River or if insufficient,transmission[
capacity-is available during'theifive-month period. -
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_Petaluma Aqueduct.. Tihe,combmed entitlement of Petaluma and,NMWD is 41.7 mgd. With
the current contractobligation'to MMWD',;the total'is 4911 mgd
The Petaluma Aqueduct is only designed to provide 31.8, mgd of water south of Ely Booster
Station.° Theadded delivery capacity of this portion Of the aqueduct is approximately 33 mgd
with both pumps, on at Ely. Booster !Station. Not only-fettle Agency unable to deliver
entitlements and contractual obligations to the water customers on the southern part of the
Petaluma Aqueduct;,as shown in,attached figures; monthly average summertime demands on
the lower portion of the Petaluma Aqueduct are currently about'30 mgd Since 1994, the
aqueduct has`•been, running between;90%a to 95%a of its Capacity;on a peak monthly average •
• basis. The Agency, however, :has experienced problems •meeting demand requirements on
• the; Petaluma.Aqueduct during, peak "demand periods since 1996. Although storage ills
available in the Cotati Tanks, the daily peak demands :downstream of Ely Booster Station
quickly deplete storage-ih Kastania Tank: I
Water use by-the cities of Rohnert P.arkand Cotati=alsoiimpacts delivery capacity on the lower •
portion of the :Petaluma Aqueduct if the.demand',by Cotati and Rohnert Park is such that! it
• causes the Cotati Tank levels•:to drop: .This can;have; a. significant impact on.the delivery • •
.a. capacity of the Tower.Petaluma Agqueduct!, r
In March 1998, the Agency ,prepared a report entitled An„Analysis of the Adequacy of the
Petaluma Aqueduct Water Delivery Capacity” (capacity, report). This capacity:report described,
' events in,1996 and 1997 when,storagelevels within the system and in Kastania Tank declined
below acceptable levels Similar events have occurred in 1999,and:2000.
• The capacity report evaluated four, structural remedial alternatives;that had the potential to
increase the capacity of the:Petaluma Aqueduct.: Only parallel aqueducts from'Cotati Tanks to " • --
Ely Booster !Station and.from,_Ely Booster Station to Kastania Tanks were found to provide
capacity benefits to the Petaluma Aqueduct south of ,Ely Booster-' Station. 'The' Eleventh
• Amended Agreement which,implements-the .Water Supply and Transmission System Proiect
(WSTSP), was not.approved:until•January•2001'., .It is anticipated that the parallelaqueducts '
from the Cotati Intertie to Kastania Tank will not be completed until 2007 at the earliest,•
assuming funding is secured in a .timely manner. Therefore; structural solu tions will not be
available in the near future, • i
i
. The capacity report also,evaluated;non-structural remedies; including increasing operations at
. Stafford Lake •Treatment Plant, reclaimed wastewater .reuse in 'Petaluma, reclaimed
wastewater',reuse in North Marin, and water conservation. The capacity report recommended
all non=structural alternatives be pursued in order to postpone the necessity to curtail water
deliveries and to reduce the curtailment necessary- The 'capacity, report also recommended
t9 Y taeimmediate st p develop mechanisms,nece s
sary to implement curtailments
in water f t P tai a
Aqueduct. consistent.,with the contractual rights and
obligations of the parties (contractors and other water'users).
The capacity report•concluded that the,most critically constricted portion of the Petaluma
Aqueduct was the portion ,from Ely Booster Station to Kastania Tank.' Problems" were '
anticipated to continue Ohl the"Petaluma Aqueduct system as projected peak-month demands -
were expected to grow at a rate',ori.4 mgd per year, r if demands on the aqueduct were not
curtailed. Both Petaluma and NMWD have reduced,their demands pn the lower Petaluma
a' Actual capacity is approximately 33fflgd;.based'on an analysis:of pump-hours and'water billed. •
A1-4
AqUedUct• over ye. s y local o et I a increased groundwater p um P g to offsettspeak b y approximately " li mg d andNMWD has s
increased its production from Lake Stafford Treatment:Plant to offset peaks:by approximately •
•
2-4 mgd.5
Onerational''Agreements
• .
Agency staff beganimeeting?with Petaluma Aqueduct Water customers:in May 1998, to,discuss
operational.criteria for the ,Petaluma Aqueduct+during; peak periods. These cntena„included -
notification requirements and demand reduction effortsysuch as conservation and •using local •
alternative supplies. These measures'were used during the summers, of `1998, 1999, and
2000 to OOP p preserve storage in Kastama Tank above critical. levels.. .Although, these,
measures have been somewhat successful, they have not been tested over long ,periods and
do`notaddress operational problemsFtfiat;could occur along'the Petaluma Aqueduct.
The•Agencyand water contractors:have negotiated a MOU. The MOU has;been:approved by
. all water contractors :and`is expected:to be approved by the Agencyr to February;2001. The,:•
purpose of''.the MOU, it to establish' an amended .procedure; for .addressing periods;of
temporary. impairment in order to optimize allocation of the available;:supply, -avoid the
necessity'for;the imposition of;the,water delivery curtailments prescribed by.Section 3:_5 of°the
Eleventh Amended Agreement, and set forth.theinecessary cooperative actions to mitigate.or
avoid the consequences of_periods of temporary;.impairment. 'The temporary,summertime. •
delivery `allocations• in the MOU for Petaluma.Aqueduct water customers are listed, below in
. Tablef2.
As,_shown in Table 2, average-day peak "month summertime allocations for the southern
.
portion of the'Petaluma Aqueduct are-expected: to be 97% to 100% of'the capacity of the
,aqueduct during the!summers. of 2001 and 2002 • Starting in 2003, allocations increase.
beyond the capacity'; Local,production capacity :values in the MOU were ;developed in prior
years and were utilized in the summers-of°2000r' Because local sources were available and
• aggressive conservation efforts were implemented, the allocation rates estimated for 2000 in
the PetalumaiAqueduct werer not realized`:6”
•
•
•
•
•
Due to pilot testing,to;meet the disinfection/disinfection byproducts rule, NMWD will be limited in its
ability to offset'peak demands during the summer of 2001.
6' The:delivery rates ini2000 were,35i5 for the total Petaluma Aqueducttend 30 3 forthesPetaluma
Aqueducesouth:of ElyBoosterStation..
. .A?'-5
. - - . ' •. . C- ' .
. . . . . '
- .
. ..z. - . .. ,
, ' •'
•
• .
. .
. .- Table i 2 -Suminertinie Allocations under the MOU . .
isk• ,,
" Local -
Average Day in:Month Delivery Rate mgd)
.Production 2000 2001 ' 2002 2003. '2004 2005
.. .
. ... . Capacity -
Cotati - ' • 0:4 1.2 12 1 .3 , 1.8 1.9 1.9
Petaluma. _ , • . 16, 14.5 140 15.1' 15.4 15.7 16.0
, Rohnert Park • , ' 3.9, - .4.8 4.8i 48 i 5.2 5.3 5.3
North Marin Aqueducti(NMVVD+ 410L 19.2 181' 169 !21.4 ' 21.3 20.1 . .
' MMWD)
--. , Total PetalumaAqüeduct I "99 39.7 . 384. -- 36,1 43.8. 44.2 43.3 .
Petaluma Aqueduct south of , 5.6 : 33,7 . 329' 32.0 • '36.8 37.0 36.1
,
Ely Booster Station, _
. • g,TheTMOU expressly recognises that these allocations .6.-not,'address limitations in the
Petaluma Aqueduct capacity; and that flows are subject to operating :Procedures setil by
.Petaluma, NMWD, .MMWD, and the Agency. .The intent -61rtheprodedures is to preserve the .
. . --.
depth of water storageiinthel'castariia;Tatik abovef.15;feetfor the benefit of Petaluma.
- - --.
- .
- ' . - ‘ •-, . .
k_
1.1
In 2000; operations staff from Petaluma, NMVVO, MMWD, and the Agency discussed new
.,. procedures including -notificatiqn and reduction efforts to maintain ,storage. in Kastania. Tanki
'TI-jese;proceduretilinclUde;f0c41.9.W.ater deliveries lb;NMWD:and 'MMWD through Kastania
Pump Station when storage; falls beleW Certain levels_ in . Kastania Tank The Modified
procedure disausSed is attadhed tolhisireport. , . .
- Department of Health Services AeVieWfof,Agency and Contractor Systems ...
•.
...
In November 2006; the California' Department of Health i.Services, Drinking -Water Branch
(OHS) issued the Sonoma County Wateit'Adectrady'Evalpation'(DItIS:report). The DHS report '
• : • assessed the:Capacity-of the Agency's and-each Ofiitsidentracto6s water,systemito safely and ' • .,
, ., , „,-
reliably meet California. Health and Safety Code; requirements. DHS used the following -.
definitions and standards in its evaluation:
_. . „
System Reliability was defined :as the ability, of the,water ,System to meet maximum .
, -
monthly demands with their largest source of eupply out of service. For each of the
• contractors, their largeati source of supply was the Agency DHS also assumed some
water conservation measures were in effect and independent system storage'that
- . • •meets waterWOrkS standerda: - . . . • -
. ". - • ,
. . .
' ReoUireeratericie capacity:- OHS interpreted this standard for existing systems with •
,
metered data to,:reqUire storage in each pressure zone to meet average day demand+
' 25%;OernexiMum day demancr+fire floW. theiEleVenthjAmended Agreement the.goal
.. - _.,
is to provide 60W6fithe desired storage or 1.5`timesTilie maximum monthly demands in
each zone;
• -i,
•
• . . . .
. .
The OHS report'looked at the.overall water system to determine'system,reliability. The DHS
identified the,irhprovements irythe,WSTSP, (including.Coilector 6, the parallel aqueducts, and
..., .,.. __..
..... . _ .. the .._ .
• r additional for- ‘Petalurna Aqueduct) that are needed to provide system reliability for
.
the next decade. The current. storage on the Petaluma Aquedikt system (48 MG) is
: . .
,.„.
•
„ .
.
A1-.6
. " - • '
. ,
• .
inadequate to meet the design ;goal ,of• the Eleventh Amended Agreement, far current
demands 7 9• •
Ttie; DHS report makes, the following assessment of each of the contractors along the
•
Petalua Aqu
m educt:t .
Petaluma does'not'have,an'adequate local source of supply and independent storage,to.
meet,the reliability standard established for DHS' study, either now'or'•by.the year 201.0.
Approximately'5 mgdofadditional.well supply and 5 MG of storage ieneeded: •
Cotati, has adequate storage,but_is deficient in independent storage meet;the DHS'
requirements; .:However,;with the`,large capacity of Agency's'storage in thisrzone, it,was
notconsidered,asignificant issue.
Rohnert Park's system is currently inadequate to,meet therexistmg ;maximum,day and
month demands, in the, system and fails to legally ; comply' with the. California '
Waterworks Standafds: Rohnert+Palk has.been,using unreliable excess supply from • '
the•Agency, .!at least since :1996 In A"mendment 11,' Rohnert.Park's,entitlement .
increases to 15.0 mgd; if adequate,supply'can be secured. If this occurs, Rohnert Park °
entitlement.and local source are more than adequate to, meet the projected•>demands
beyond 2010. ' _
,. .• • NMWD has adequate;sourceand.storage capacity to meetcurrent demands However,the
Petaluma Aqueduct is currently at'or,aboveits maximum capacityto''safely and adequately
deliver the NMWD's full,entitlement. NMWD:has•rnadequaterindependent=source capacity
to ensure:a reliable supply during;an extended outage from the Agency. However, with
' improvements to Lake Stafford WaterTreattment Plant; NMWD :could, meet this-
requirement:
•
MMWD cannot get its full
allocation of water(,1.2 8 mgd) under Ocirrerit conditions; aesuming, -
su rP I9s•water were available,,because of the limitations in the Petaluma Aqueduct. Na'
storage,assessments were made:_
Based on DHS's assessments of each water customers' local system,;=all water;customers
along the;Petaluma Aqueductwould be impacted if a:problem.occurred onthe Agency's
• transmission system.
.
Conclusions and Recommendations
The Petaluma Aqueduct is unable to meet. peak-day demands of the system. Parallel
aqueducts must'be constructed before the Agency will reliably meet :peak=day. demands. .
These are subject to additional environmental review, and or funding. At the earliest,- the
parallel aqueduct will be available in 2007 The Petaluma Aqueduct is :also vulnerable,to -
mechanical, electrical„ and structural outages, which could significantly impact the Agency's
ability to deliver water to Petaluma Aqueduct water customers throughout the year :Eased!on _
the DHS report, neither the Agency nor the Petaluma Aqueduct'water customers meet'the,
design guidelines established in the Eleventh Amended:Agreement, and many of ,the water
111,Current,storage is•48.,MG. According to the DHS report, the maximum nionthly?demand`on•the'. .
Petaluma Aqueduct,is.34`9.MG and.52.4•MG of storage:is';required. The current deficit is 4.4 MG. •
A1_7
• contractors are lacking storage. or adequate backup supplies in the case of a prolonged
,.. . 'outage.
To address these issues, Agency'staff recommends'•the following:
.
1 Notify DHS and elected officials,of communities who utilize'the.Phtaluma Aqueduct of
its inability to meet demands during peak:water use'and;itsrvulnerabilityto outages due
• toy mechanical,•electrical, and'structural problems.
2. Encourage Petaluma Aqueductcustomers to adopt mandatory conservation ordinances '
and implement water conservation:efforts: J
3. Strongly_ encourage Petaluma Aqueduct water "customers to implement demand-- .
reducing measures; such as lwater.conservation, recycled water,projects that offset
potable water use, and standby local peak month production capacity that reduces .
demand on the,water:transmission system .
4. Continue to work with`Petaluma 'Aqueduct customers to develop operating criteria and '
procedures to address, all potential outages that,have been described in this report. ' •
5. :Evaluate-;the potential-to install: auxiliary-power at Ely Booster,Station to protect against
•
'Power outages., - - = :i.6. To:ahe ezterit possible, expediteithe construction•of the`parallet,aqueducts. .
a. _ 1 l• ,
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Purrent, Operating Procedures forthe
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SOUthern Portion:Ofthe Pota littrie Aqueduct
• Abfinn.Levels,in Kastania,Tatik
Level 1 - 10r feet at Kastania Tank
r „
The SCWA will operate both pumps at -EIS? Booster Station if Kastania Tank
reaches this level and will continue to operate' all pumps until Kastania Tank reaches
maximum operating levels!
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- LOVel-2 20,feetat !taste-hie Tank _ •
_ At this stage, NM.W.la will turn off the 450. horsepovver.,pump„ at Kastania Puthp
- Station and utilize:only•lhe,250'horsepower pump!,at Kastania Pump Station.
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Level 3 — 15 feet at Kastania Tank
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.. All pumps at Kastania Pump Station 'will:•beHitirried off Until such a timelas
KastaniaPTank regaihs storagedevel to;2b feet: •
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110. 8 This is limited to all pumps iircilie:tatifig•donditiOn. Ely Booster Station not be operatecf.to the detriment of
the restof(the,Transmission System.,If the transmission system is impaired, storage in•Kastania Tank will be
- lowereclat the same ratelas•the rest.dfithe:transmision system.
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• Al .#12
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