HomeMy WebLinkAboutStaff Report Item 1.ACITY OF PETALUMA
WATER ISSUES WORKSHOP
Department of Public Works and Utilities
Presented by: Dan St. John, F.ASCE, Director
January 13, 2014
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INTRODUCTION
Water Team
Leonard Olive, Operations Manager
Leah Walker, Environmental Services Manager
Pat Dirrane, Utility Supervisor
Dave Iribarne, Water Conservation Coordinator
Kent Carothers, Associate Engineer
Current Issues
Water Supply and Demand in Face of Drought
Water Shortage Declaration
Out of Town Water Use
Recycled Water System
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SUMMARY OF SOURCES AND SUPPLY
SCWA Commitment
13,400 Acre Feet per Year (AF/Y) = 12 MGD avg
21.8 MGD Max Month Average
2013 Delivery: 9,578 AF/Y
Ten City Wells
Estimated Sustained Capacity: 2.2 MGD
2013 Delivery: 164 AF/Y = 146,000 gal per day
Emergency Supply Only
Water Conservation
Urban Offsets from Recycled Water
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URBAN WATER MANAGEMENT PLAN FORMAT
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System
Losses 696 712 728 736 815 975 1,023 1,070 1,118 1,166
Demand
Reduction
Programs
295 588 609 714 776 1,102 2,190 2,295 2,402 2,507
Net
Potable
Water
Demand
10,448 8,130 8372 9144 9780 10,627 10,112 10,580 11,047 11,515
Population 58,771 59,126 59,314 60,457 61,500 63,306 66,376 69,447 72,517 75,587
gpcd 153 119 118 128 131 150 136 136 136 136
Gpcd
Target 153 153 153 153 153 153 136 136 136 136
2011
Actual
System losses and Population for 2013 are estimated.
14,022
0
Subtotal
Gross
Demands
10,743 8,718 8981 9858 10556 11,729 12,303
12,331 12,856
Sales to
Other 0 0 0 0 0 0 0
Water
Deliveries 10,047 8,006 8253 9122 9741
Total Water Use, acre-feet per year (Calendar Year)
2005
Actual
2010
Actual
2012
Actual
2013
Actual 2015 2020 2025
12,875 13,449
0 0
10,754 11,280
2030 2035
11,805
MONTHLY DEMAND TRENDS
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RELIANCE ON SONOMA COUNTY WATER AGENCY
SUPPLY
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ACTIVE WELL LOCATIONS
WATER CONSERVATION & URBAN OFFSETS
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PROPOSED ALLOCATION MODEL
SCWA “restructured agreement” provisions:
Sets Local Production Capacity Goal: 40% Max Month Average in City = 4.5 MGD
Establishes need for “Water Shortage Allocation Methodology” during periods of “Anticipated Shortages”
Draft Allocation Model
Under development by TAC since September 2012
Addresses “reasonable requirements” & “human consumption, sanitation, and fire protection” needs
Monthly, not annual, model is more responsive
Assumes local supply = 1 MGD
Going to WAC for approval in February
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TEMPORARY URGENCY CHANGE PETITION
Driest year since 1894
Lake Mendocino at 26,000 AF at end of 2013 (39%)
“Critical Water Supply Conditions” < 31,000 AF
Potter Valley/Eel River diversions down 50% since 2004
Approved 12/31/13 by State Water Resources Control Board (Filed on 12/19/13)
Preserves water in Lake Mendocino
Lowers minimum flows in Upper Russian River from 75 to 25 cubic feet per second (cfs)
Sonoma-Marin Saving Water Partnership kicking off water conservation campaign
Principal contractors commit to regional campaign including “no outdoor irrigation” during winter.
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LOCAL SUPPLY CONTINGENCY PLANNING
Readying City wells for drought contingency
Re-drilling replacement well – Park Place
Evaluating wellhead treatment on three wells
Iron and manganese exceed MCL’s in several wells
Arsenic exceeds MCL in one well
Hydrogen sulfide in wells – consumes chlorine
Extending recycled water service to additional
parks and schools
Contacting private well owners who could be
temporarily impacted by City well operations
Water shortage declaration & outreach
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THERE’S A DROUGHT ON. TURN THE WATER OFF.
Water Shortage Contingency Plan
Stage 1 –Minimal
15% Voluntary Community-Wide Reduction
Public information, hose shut-off nozzles, no pavement washdown
Stage 2 – Moderate
25% Mandatory - Set Allocations per Customer Class
Irrigation 7pm to 8am only, no fountains, no new swimming pools
Stage 3 – Severe
35% Mandatory – Reduction in Set Allocations
No new landscape installs, no swimming pool filling
Stage 4 – Critical
50+% Mandatory– Further Reduction in Set Allocations
No irrigation 12
www.wateroff.org
POLICY ISSUE: TRUCKING WATER OUTSIDE CITY
Against spirit of PMC without Council OK
Prohibition to re-sale of water
Demand: 50,000 gpd (0.7% of total demand)
Options:
Eliminate practice
Transition period
Impact on ag interests to west
Develop standard contract with higher fees
PMC allows higher fees for out of service area customers
Ability to curtail during drought/supply interruptions
Require use of recycled water where possible
Evaluate LAFCO and GP implications
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RECYCLED WATER SYSTEM DELIVERY
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RECYCLED WATER SYSTEM IMPROVEMENTS
Last summer:
Added Prince, Wiseman, and Airport Parks
System upgrades completed: Increased delivery capacity to about 4.3 MGD during summer
Instituted new ag contracts that eliminated “payment to ag users” policy. All users now pay City
By summer 2014, will add:
Casa Grande High School and football field
Extend to parks, open space and LAD’s near existing purple pipe
Increased use by Jackson Family and other vineyards
Within next few years:
Extend purple pipe north towards SRJC
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NORTH BAY WATER REUSE AUTHORITY
Joined Phase II program in May 2013
Focus on funding of recycled water projects
City fee proportional to amount of projects under study by authority consultants
Refinement of Recycled Water Project List
Projects able to complete within 10 year window
Higher benefit-cost projects
Council will be asked to approve project list
1.Urban Recycled Water Expansion
2.Agriculture Recycled Water Expansion
3.ECWRF Production Capacity Increase
4.ECWRF Storage Capacity Increase
Evaluating impact on GP and UWMP
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RECYCLED WATER EXPANSION PROJECT LIST
Program Area/Project
Demand
(AFY) Capital Costs (CIP Budget) Cost - Benefit ($/af)
1. URBAN RECYCLED WATER SERVICE
Phase 1 - Utilize Existing RW Transmission Main
1a. Airport, Prince, Casa Grande, Southgate, Wiseman 88 Budgeted
1b. Baywood Dr, St Francis Dr and surrounding areas 48 $4,100,000 $85,417
Phase 2 - Extend RW Transmission Main
2a. Transmission Main along Eastern Open Space to Corona Rd (SRJC,
Kenilworth School, Corona Creek) 57 $4,300,000 $75,439
2b. Loop through Maria Drive to N. McDowell (Meadow, Bond,
Bernard Elem, Lucchesi) 90 $5,800,000 $64,444
2c. Cross Highway 101 (Rainier, McKinley, and Fairgrounds) 12 $4,600,000 $383,333
Phase 3 - Westside Across River
3a. Pet Blvd S, Magnolia, Howard, English St 57 $24,300,000 $426,316
3b. Petaluma Golf & Country Club 72 $10,500,000 $145,833
2. AGRICULTURAL RECYCLED WATER SERVICE
Phase 1. Lakeville Rd from Ellis Creek to Old Lakeville Rd 1 1,215 $10,800,000 $8,889
Phase 2. Lakeville Rd from Old Lakeville Rd 1 to Old Lakeville Rd 2 530 $7,000,000 $13,208
Phase 3. Lakeville Rd from Old Lakeville Rd 2 to Old Lakeville Rd 3 840 $14,200,000 $16,905
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RECYCLED WATER EXPANSION PROJECT LIST
Program Area/Project
Demand
(AFY) Capital Costs (CIP Budget) Cost - Benefit ($/af)
3. ECWRF Production Capacity Increase
The current capacity of the two existing ultra violet (UV) light
treatment channels is 5.2 million gallons per day (mgd). By adding
a third UV treatment channel, an additional 2.6 mgd of capacity
will be created. This additional capacity will assist in meeting
future demands.
NA TBD
4. ECWRF Storage Capacity Increase
Winter storage pond to increase summer supply. Will determine
feasibility of developing additional storage of recycled water at the
ECWRF or on adjacent properties.
NA TBD
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URBAN RECYCLE WATER SYSTEM EXPANSION
AG RECYCLE WATER SYSTEM EXPANSION
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PREVIEW OF FUTURE COUNCIL ACTIONS
Adoption of Water Shortage Contingency Plan
Purchase of wellhead treatment systems and
replacement wells
Model contract for potable and recycled water
haulers
Amended contract for ag use of recycled water
Adoption of North Bay Water Reuse Authority
recycle project list
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DISCUSSION AND QUESTIONS
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