Wet Weather Wet Weather Improvements ProjectImprovements Project

November 2, 2007November 2, 2007

North Bay Watershed North Bay Watershed Association Board Association Board

MeetingMeeting

C E N TR A L M A R INS A N ITATIO N A G E N C Y

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Presentation OutlinePresentation Outline

About CMSAAbout CMSA

The Wet Weather ChallengeThe Wet Weather Challenge

12/31/05 Rain Event12/31/05 Rain Event

Wet Weather Improvement Wet Weather Improvement Project Project

How to pay for the ProjectHow to pay for the Project

What is Happening NowWhat is Happening Now

Questions/CommentsQuestions/Comments

About CMSAAbout CMSAAbout CMSAAbout CMSA

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About CMSA - HistoryAbout CMSA - History

CMSA Joint Powers Agreement in 1979CMSA Joint Powers Agreement in 1979– City of LarkspurCity of Larkspur– San Rafael Sanitation DistrictSan Rafael Sanitation District– Ross Valley Sanitary DistrictRoss Valley Sanitary District– Sanitary District #2 (Corte Madera)Sanitary District #2 (Corte Madera)

CMSA constructed in early 1980sCMSA constructed in early 1980s– Located in San Rafael (Andersen Drive)Located in San Rafael (Andersen Drive)– Began operation in May 1985Began operation in May 1985– Replaced four small plants in Central MarinReplaced four small plants in Central Marin

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CMSA Service AreaCMSA Service Area

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About CMSA - GovernanceAbout CMSA - Governance

Appointed Board of CommissionersAppointed Board of Commissioners• Al Boro, San Rafael council, 16 yearsAl Boro, San Rafael council, 16 years

• Paul Cohen , San Rafael council, 15 years Paul Cohen , San Rafael council, 15 years (retired)(retired)

• Bob Sinnott, Larkspur Fire Chief, 4 yearsBob Sinnott, Larkspur Fire Chief, 4 years

• John Dupar, Corte Madera council, 2 yearsJohn Dupar, Corte Madera council, 2 years

• Sue Brown, Ross Valley Sanitary, 1.5 yearsSue Brown, Ross Valley Sanitary, 1.5 years

• Pat Guasco, Ross Valley Sanitary, 1.5 yearsPat Guasco, Ross Valley Sanitary, 1.5 years

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About CMSAAbout CMSA

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About CMSA - ServicesAbout CMSA - Services

Treatment & Disposal of WastewaterTreatment & Disposal of Wastewater

Treatment & Disposal of BiosolidsTreatment & Disposal of Biosolids

Source control regulation – Source control regulation – commercial/industrialcommercial/industrial

Public education – Marin CountyPublic education – Marin County

Contract ServicesContract Services– Pump station O&M for Corte MaderaPump station O&M for Corte Madera– Source control/FOG management for LGVSDSource control/FOG management for LGVSD– FOG management with Ross Valley and San RafaelFOG management with Ross Valley and San Rafael– Financial administration for San Rafael San - Financial administration for San Rafael San - pendingpending

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About CMSA - OperationsAbout CMSA - Operations

40 staff members40 staff members– Administrative, Finance, & EngineeringAdministrative, Finance, & Engineering– Operations, Maintenance, & ElectricalOperations, Maintenance, & Electrical– Laboratory, Environmental ComplianceLaboratory, Environmental Compliance

Fiscal Year 2007/2008 BudgetFiscal Year 2007/2008 Budget– $ 9 Million Operating $ 9 Million Operating – $ 18 Million Capital$ 18 Million Capital

Treat about 11 Million Gallons per Day (MGD)Treat about 11 Million Gallons per Day (MGD)

Serve about 110,000 customers, incl San Serve about 110,000 customers, incl San Quentin Quentin

The Wet The Wet Weather Weather ChallengeChallenge

The Wet The Wet Weather Weather ChallengeChallenge

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The Wet Weather ChallengeThe Wet Weather Challenge

Average dry weather flow is 8 MGDAverage dry weather flow is 8 MGD

Wet Weather Flow has reached almost Wet Weather Flow has reached almost 115 MGD (14.5 x increase)115 MGD (14.5 x increase)

– Wet Weather flows increased over 90% since 1985Wet Weather flows increased over 90% since 1985– Caused by infiltration/inflow in collection systemsCaused by infiltration/inflow in collection systems– Increase has been 85+% at each member agencyIncrease has been 85+% at each member agency

Reason is increased pumping capacity by Reason is increased pumping capacity by JPA members and deteriorating pipelinesJPA members and deteriorating pipelines• Local solution to minimize sewer overflowsLocal solution to minimize sewer overflows

• Does not consider regional impactsDoes not consider regional impacts

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Wet Weather ChallengeWet Weather Challenge

0

20

40

60

80

100

120

1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005

Year

FL

OW

, MG

D

ADWF

Average

Max. day

Max. hour

Max. peak

90 mgd Maximum Plant Treatment Capacity

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Flows vs GrowthFlows vs Growth

Total Member Agency Peak Flows vs. EDU Growth

60

70

80

90

100

110

120

88 89 92 93 94 95 96 97 98 99 00 01 02

Date

Pea

k F

low

s (

MG

D)

25,000

30,000

35,000

40,000

45,000

50,000

55,000

Econ

om

ic D

welli

ng U

nits

(E

DU

)

Member Agency Flows74% growth over period

Member Agency EDUs9% growth over period

December December 31st Storm 31st Storm December December

31st Storm 31st Storm

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December 31st stormDecember 31st storm

Peak Flow @ 115 MGD (historic maximum)Peak Flow @ 115 MGD (historic maximum)

100 MGD+ for 14 hours100 MGD+ for 14 hours

Emergency contingency plan usedEmergency contingency plan used• Monitor storm front (Doppler radar), tides, & flowMonitor storm front (Doppler radar), tides, & flow

• Back flow into plant – try not to flood; thenBack flow into plant – try not to flood; then

• Balance filling pond with backing up flow; thenBalance filling pond with backing up flow; then

• Contain spilling to on-site storm drain ditches; whileContain spilling to on-site storm drain ditches; while

• Protecting process equipment (electrical) & biomassProtecting process equipment (electrical) & biomass

• Worst case – flood plant and spill off-siteWorst case – flood plant and spill off-site

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Aerial PhotoAerial Photo

NN

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Blending Channel SpillingBlending Channel Spilling

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Secondary Clarifier FloodingSecondary Clarifier Flooding

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Overflowing at Contact Tank Overflowing at Contact Tank DeckDeck

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Spilling out of the Contact TanksSpilling out of the Contact Tanks

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Flooding at the Chlorine BldgFlooding at the Chlorine Bldg

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Flow Out of the PondFlow Out of the Pond

Wet Weather Wet Weather Improvement Improvement

Project Project (WWIP)(WWIP)

Wet Weather Wet Weather Improvement Improvement

Project Project (WWIP)(WWIP)

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WWIP - GoalsWWIP - Goals

Accommodate a 5-Year Design Event

Restore Existing Storage Pond

Capacity

Prevent overflows and meet treatment

requirements

Accommodate a 125 mgd Collection System Hydraulic Limit

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WWIP - Wet Weather Flow WWIP - Wet Weather Flow ImprovementImprovement

Increase treatment capacityIncrease treatment capacity• Polymer facility, 2 primary clarifiers, secondary Polymer facility, 2 primary clarifiers, secondary

improvements, 2 chlorine contact tanksimprovements, 2 chlorine contact tanks

Increase hydraulic capacityIncrease hydraulic capacity• 155 MGD effluent pump station & standby power155 MGD effluent pump station & standby power

Outfall strengthening improvementsOutfall strengthening improvements

Expand storage pond to 7 million gallonsExpand storage pond to 7 million gallons

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Layout of Key WWIP Layout of Key WWIP FacilitiesFacilities

Legend

New WWIP Facilities

New O&M Improvements

Existing Facilities

N ew P o lym er F ac ility

Two N ew C h lo rineC o ntac t TanksN ew

R eta in ing W all

N ew E ffluentP um p S tatio n/D iese l E ng ine

B uild ing

N ewJ unc tio n B o x

A uto m ate G atesand Va lves

R es to reE ffluent P o nd

Two N ewP rim ary C larifiers

G rit C ham b er 3M ec hanica l

D rain P ump

C C T M ixer

Influent M eter

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Master Project ScheduleMaster Project Schedule

Predesign

Final Design

Bid/Award

Permit Renewal

CEQA

Activity(1)

(1) Schedule represents improvements for 125 mgd collection system hydraulic limit for 5 year design flow event.

Notes:

Finance/Rate Planning

Study

2005 2006 2007 2008 2009

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

Debt Issuance 50%50% 90%90%100100%%

Q1 Q2

2010

SubmittedReport of Waste

Discharge

Construction

How to pay for How to pay for the Projectthe Project

How to pay for How to pay for the Projectthe Project

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WWIP - Project CostsWWIP - Project Costs

Element Element No.No. Required ElementsRequired Elements Construction Construction

Cost Cost (1)(1)

11 Capacity Management StudyCapacity Management Study $221,000$221,000

22 Pre-DesignPre-Design $590,000$590,000

33 CEQACEQA $52,000$52,000

44 Final DesignFinal Design $4,060,000$4,060,000

55 Engineering Services During Engineering Services During ConstructionConstruction $2,113,000$2,113,000

66 Construction Management (3Construction Management (3rdrd Party & Party & Staff)Staff) $4,200,000$4,200,000

77 WWIP ConstructionWWIP Construction $35,500,00$35,500,0000

88 Storage Pond & Outfall Improvements Storage Pond & Outfall Improvements $2,300,000$2,300,000

99 Change Order AllowanceChange Order Allowance $4,200,000$4,200,000

TotalTotal $53,236,00$53,236,0000

(1) Based on ENR of 9460 at mid-point of construction (December 2008).(2) Pond provided for plant operational flexibility.

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How to Pay for the WWIPHow to Pay for the WWIP

Board forms a finance committee to consider pay-Board forms a finance committee to consider pay-as-you-go or debt issuance scenariosas-you-go or debt issuance scenarios

Committee recommends and Board approves Committee recommends and Board approves issuing tax-exempt revenue bondsissuing tax-exempt revenue bonds

Debt issuance process through summer of 2006Debt issuance process through summer of 2006

$69 million in bonds sold in October 06 at 4.33%$69 million in bonds sold in October 06 at 4.33%

Proceeds fund the WWIP and CIP to FY11/12Proceeds fund the WWIP and CIP to FY11/12

What is What is Happening Happening

Now?Now?

What is What is Happening Happening

Now?Now?

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What is Happening at CMSAWhat is Happening at CMSA

Effluent Storage Pond enlargement will be Effluent Storage Pond enlargement will be completed in late November 2007completed in late November 2007

Outfall Improvements @ 50% designOutfall Improvements @ 50% design

WWIP – contract awarded in SeptemberWWIP – contract awarded in September• Notice-to-Proceed issued in OctoberNotice-to-Proceed issued in October

• Preconstruction conference and Partnering Workshop Preconstruction conference and Partnering Workshop heldheld

• Construction has focused on staging area Construction has focused on staging area development, clearing & grubbing, installing fencing.development, clearing & grubbing, installing fencing.

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What is Happening at JPA What is Happening at JPA AgenciesAgencies

San Rafael San has raised its raised from San Rafael San has raised its raised from $26/month to $54/month over 5 years to $26/month to $54/month over 5 years to support 80 yr rehabilitation programsupport 80 yr rehabilitation program

Corte Madera raised rates from $15/month Corte Madera raised rates from $15/month to $42/month to support a 40 yr to $42/month to support a 40 yr replacement programreplacement program

Ross Valley Sanitary District has completed Ross Valley Sanitary District has completed system wide studies and developed a 10-yr system wide studies and developed a 10-yr CIP. Their rate will likely be raised next CIP. Their rate will likely be raised next yearyear

Each district has accelerated their pipeline Each district has accelerated their pipeline replacement activities.replacement activities.

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Effluent Pond ProjectEffluent Pond Project

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Effluent Storage Pond ProjectEffluent Storage Pond Project

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Rendering of CCTs and Pump Rendering of CCTs and Pump StationStation

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Rendering of New ClarifiersRendering of New Clarifiers

Questions/Questions/CommentsCommentsQuestions/Questions/CommentsComments

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