Well 4 TCP and Nitrate Mitigation Project


SCH Number
Lead Agency
Mettler County Water District
Document Title
Well 4 TCP and Nitrate Mitigation Project
Document Type
MND - Mitigated Negative Declaration
Present Land Use
Medium Industrial, Precise Development Combining and designated as General Commercial, Residential (Max 10 Units/New Acre) and Service Industrial by the Kern County General Plan
Document Description
Provost & Pritchard prepared a technical memorandum titled “Mettler CWD 1,2,3-Trichloropropane and Nitrate Mitigation Feasibility Study” to define design treatment methods associated with contamination from the synthetic organic chemical (SOC) 1,2,3-trichloropropane (TCP) and nitrate at one of the community’s wells (Well 4). The Mitigation Study identified improvements required to treat the TCP with granular activated carbon (GAC) and blend the Well 4 water with Well 3 water to reduce the level of nitrate. The nitrate blending system is assumed to consist of passive, manually adjustable, flow control valves and flow meters with a nitrate analyzer to monitor performance. The project is in a developed area (truck stop and rest area). The Area of Potential Effect is approximately 18,000 sq ft including a 20 ft corridor for the new pipeline connecting the Well 4 discharge to the treatment site. The proposed project consists of water treatment facilities at the existing Well 3 site. Specific dimensions of construction components are listed below: • GAC vessels (2 total): 12’ diameter; 15’-0” tall; 18’x36’x2’ concrete foundation • Backwash supply tank: 32’-8” diameter; 16’-1” tall; 2’x3’ ring wall footing • Electrical service upgrade – to allow both well pumps to operate simultaneously • Approx. piping: o 4” pipe – 100’ o 6” pipe – 500’ o 8” pipe – 250’ o 12” pipe – 80’ • Reclaim pump: 40 gpm pump on 6’ x 4’ concrete pad • Backwash Supply Pump: 1,500 gpm on 6’ x 4’ concrete pad • Chain link fence: 250 LF; and 30’ double access gate • Site improvements area: ˜ 7,000 sf • Nuisance Water Pond: 25ft x50ft (20,000 gal)

Contact Information

Briza Sholars
Agency Name
Provost & Pritchard
Contact Types
Lead/Public Agency

Agency Name
Mettler County Water District
Contact Types
Project Applicant


Citywide, Unincorporated
Cross Streets
Mettler Frontage Road
Total Acres
18000 sq ft
Parcel #
State Highways
SR 99, I-5, Hwy 166
Tecuya Creek
Mt. Diab

Notice of Completion

State Review Period Start
State Review Period End
State Reviewing Agencies
California Air Resources Board (ARB), California Department of Conservation (DOC), California Department of Fish and Wildlife, Central Region 4 (CDFW), California Department of Parks and Recreation, California Department of Transportation, District 6 (DOT), California Department of Water Resources (DWR), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Regional Water Quality Control Board, Central Valley Fresno Region 5 (RWQCB), Central Valley Flood Protection Board, Department of Toxic Substances Control, Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Divison of Financial Assistance
Development Types
Waste Treatment:Toxic Substance (TCP Well Treatment)
Project Issues
Biological Resources, Cumulative Effects, Other


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