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Brown and Caldwed Consultants RECEIVED -' 723 S StreetJUL1 '7 Sacramento J V L I I 190913 California 95814-7092 (916)444-0123 ENVIRONMENTAL HEALTH FAX(9161444-8437 PERMIT/SERVICES July 12, 1990 Ms. Mabel Hall General Manager Woodbridge Irrigation District 1877 North Sacramento Road Woodbridge, California 95258 017=3214-74 Dear Ms. Hall: As we discussed during our telephone conversation on June 18, 1990, ARCO Products Company (ARCO) requests permission from Woodbridge Irrigation District (District) to discharge waters to the stormwater system of which the District controls the final receiving waters. ARCO owns a service station located at 50AWest K-ettleman-Lane inTI:odi; California at which some gasoline constituents have spilled or leaked into the groundwater beneath the station. ARCO and the State of California Regional Water Quality Control Board(RWQCB)have determined that the quickest way to clean up this groundwater contamination is to extract the water by pumping on-site wells. This extracted water will be treated to drinking water standards and then must be discharged. We are currently applying for a National Pollution Discharge Elimination System (NPDES) permit to allow the treated water to be discharged to the stormwater system. Since the District controls the final receiving waters for the stormwater system, the NPDES permit cannot be issued without its approval. Therefore, on behalf of ARCO Products Company, we are requesting that the Woodbridge Irrigation District Board of Directors consider this request at its July 17, 1990 Board meeting. Specific information on ARCO's proposed discharge is given below: Discharge rate: A maximum of 2 gallons per minute for up to 24 hours per (2,880 gallons per day or 400 cubic feet per day). Duration: Anticipate extraction will continue for at least 3 years. Water quality of discharge: All extracted water will be treated to remove hydrocarbon constituents to the following maximum daily values: benzene to <0.7 parts per billion (ppb); ethylbenzene to <680 ppb; toluene to <100 ppb; xylene to <620 ppb; total petroleum hydrocarbons to <10 parts per million. Point of discharge: Storm sewer inlet on site.