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California Regional Water Quality Control Board Central Valley Region Winston H.Hickox Sacramento Main Office Gray Davis Secretaryfor Internet Address: http://www.swrcb.ca.gov/rwgcb5 Governor Environmental 3443 Routier Road,Suite A,Sacramento,California 95827-3003 Protection Phone(916)255-3000•FAX(916)255-3015 23 January 2001 Mr. Steve Winkler San Joaquin County Public Works P.O. Box 1810 Stockton, CA 95201 STORMWATER DISCHARGE AT FLAG CITY CHEVRON, 6421 CAPITOL AVENUE, LODI SAN JOAQUIN COUNTY Under Board Cleanup and Abatement Order No. 5-00-700,Flag City Chevron currently operates an on-site groundwater extraction and treatment remediation system to eliminate petroleum hydrocarbons and fuel oxygenates from groundwater beneath their site. This remediation system began operating in November 2000,to protect County Service Area(CSA) wells located east of Flag City Chevron. Groundwater from eight on-site extraction wells is processed through four, 2,500-pound carbon vessels connected in series, then discharged into an irrigation ditch south of the Flag City Chevron site. Flag City Chevron was issued NPDES Permit No.CAG915001 to discharge treated groundwater into the irrigation ditch. The attached figure shows the Flag City Chevron site and adjacent properties. An access agreement between Flag City Chevron and the irrigation ditch owner allows a monthly flat rate access fee and a maximum discharge of 25 gallons per minute (gpm)to the irrigation ditch. Board staff discussed the access fee with the State Water Resources Control Board Cleanup Fund(Cleanup Fund),the State agency that provides reimbursement funds to Flag City Chevron for cleanup activities resulting from underground storage tank discharges. We agree with Cleanup Fund staff that the monthly access fee is too high. Therefore, we wish to find a cost effective alternative to dispose of Flag City Chevron's remediation system effluent water. I suggested discharging the effluent water to the stormwater system and contacted your office in early January 2001 for assistance. In the facsimile you sent to me on 8 January 2001, and in our phone conversation on 11 January 2001, you requested quality and quantity information of the proposed effluent water. The requested information is provided below for your review. The proposed discharge to the San Joaquin County Public Works stormwater system is as follows: • The daily discharge will not exceed 25 gpm, or 36,000 gallons per day. • The water will be non-detect for all petroleum hydrocarbons and fuel additives, and will be filtered by pumping through a 25-micron sock filter to remove solid particles. • The point of discharge will be at one of the on-site drain inlets, and the discharge water will be conveyed through the County stormwater system to the CSA storm ponds. • The estimated duration of groundwater extraction and treatment is 24 months. California Environmental Protection Agency co Recycled Paper