SOUTH STOCKTON GROUNDWATER WELL REHABILITATION AT WELL SSS8 PROJECT Municipal Utilities Department
January 13, 2022
Agenda Item No. 3.2
WATER SERVICE AREAS
NORTH STOCKTON
BOUNDED
IN NORTH – EIGHT MILE ROAD
IN SOUTH – CALAVERAS RIVER
IN EAST – HWY 99
IN WEST – SAN JOAQUIN RIVER & WHITE SLOUGH
SOUTH STOCKTON
BOUNDED
IN NORTH – CALAVERAS RIVER
IN SOUTH – FRENCH CAMP ROAD
IN EAST – KAISER ROAD
IN WEST – SAN JOAQUIN RIVER
SOUTH STOCKTON SERVICE AREA
HWY 99
I-5
WELL SSS8 LOCATION MAP
POCK LANE
INDUSTRIAL DRIVE
ARCH
AIRPORT
ROAD
CA STATE ROUTE 99
BOEING WAY
ERNIE SHROPSHIRE PARK
WELL SSS8
WELL SSS2
WELL SSS1
WATER SUPPLY AND DEMAND
South Stockton Water Supply
Total of 5 wells
2 active wells
3 inactive wells
Stockton East Water District
South Stockton Water Demand
Existing Maximum Day Demand – 9 MGD
SOUTH STOCKTON WATER SUPPLYNormal Year
SOUTH STOCKTON WATER DEMAND
Existing Maximum Day Demand …………………………………..……………….….… 9 MGD When Stockton East Water District Supply is available,
water supply surplus …..…………..……………………................……..…….…… 3 MGD If Stockton East Water District Supply is not available due to drought or emergencies, water supply deficit ………………………………..…………………………..…….…… 3 MGD Existing Water Well SSS8 Supply Capacity ………………………………………….. 4 MGD If Water Well SSS8 is in service,
water supply surplus …..……….……………………….……………………..…….…… 1 MGD Above stated values are rounded to the next whole number
REQUEST FOR PROPOSAL (RFP)
WELL SSS8 WATER QUALITY
Constituent
Highest Measured Value (2000 – 2021)
Threshold
Value
PFOA
9.1 ng/L
Public Notification Level
Response Level
5.1 ng/L
10 ng/L
PFOS
29 ng/L
Public Notification Level
Response Level
6.5 ng/L
40 ng/L
Arsenic
12 μg/L
Primary MCL
10 μg/L
Iron
14,000 μg/L
Secondary MCL
300 μg/L
Manganese
190 μg/L
Secondary MCL
50 μg/L
Turbidity
4.8 NTU
Secondary MCL
5 NTU
PROJECT REQUIREMENTS
CEQA documentation
Geotech investigations
Surveying
Design
Construction
Permitting
Commissioning and Start-up
DESIGN APPROACHES
PFOA and PFOS exceeds Notifications Levels
Granular Activated Carbon (GAC) or Ion Exchange (IX)
Iron, manganese, and arsenic are within manageable levels Can be removed by cartridge filtration
Analyze existing electrical system, existing pumps and motors Replace inactive gaseous chlorine with sodium hypochlorite disinfection system 8-foot block wall around project site
Two Feasible Treatment Technologies for PFAS Wellhead Treatment Larger footprint, would not fit on existing well site
Higher capital cost
Lower O&M cost
Requires a sewer connection for backwash waste
Less effective for short-chain PFAS
Effective for VOC removal
Microbial growth
GAC
Ion Exchange (IX)
Smaller footprint, fits on existing well site
Lower capital cost
Higher O&M cost
No backwash produced, does not require sewer connection More effective for short-chain PFAS
Not effective for VOC removal
PROJECT APPROACH
ERNIE SHROPSHIRE PARK
PROJECT APPROACH
RECOMMENDATION
Forward the Progressive Design-Build contract to the City Council for consideration and approval