Wet Weather Improvements Project
description
Transcript of Wet Weather Improvements Project
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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