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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> ORDER NO. R5-2003-0166 <br /> WASTE DISCHARGE REQUIREMENTS <br /> FOR <br /> CONTIGROUP COMPANIES <br /> FRENCH CAMP GRAIN ELEVATOR <br /> ENHANCED BIOREMEDIATION PILOT STUDY <br /> SAN JOAQUIN COUNTY <br /> The California Regional Water Quality Control Board, Central Valley Region (hereafter <br /> Regional Board), finds that: <br /> 1. ContiGroup Companies (hereafter Discharger) submitted a Report of Waste Discharge <br /> on 18 July 2003 and supplemental information on 25 September 2003 for an enhanced <br /> bioremediation pilot study. The Discharger formerly owned the active grain storage <br /> and transfer facility at 9504 South Harlan Road in French Camp, Assessor's Parcel <br /> Number 193-21-003 at Township 1S, Range 6E, Section 2,Mount Diablo Base and <br /> Meridian (hereafter referred to as Site). The current owner is French Camp Grain <br /> Elevator LLC. The general location of the facility is shown on Attachment A, which is <br /> attached hereto and made part of this Order by reference. <br /> 2. Historically, liquid fumigants containing carbon tetrachloride were stored on the Site in <br /> five-gallon buckets. Carbon tetrachloride was found in groundwater in 1999. The <br /> Discharger has performed several investigations to delineate the extent of carbon <br /> tetrachloride and its breakdown product, chloroform. Three water bearing zones are <br /> identified at the Site and are monitored by 14 groundwater monitoring wells as required <br /> by Monitoring and Reporting Program(MRP)No. 5-00-858. The Site has two private <br /> supply wells that were previously used for irrigation. <br /> 3. The Discharger proposes an enhanced bioremediation pilot study using the proprietary <br /> polylactate compound Hydrogen Releasing Compound(HRC(D) to degrade carbon <br /> tetrachloride and chloroform under anaerobic conditions. The pilot study will evaluate <br /> injection spacing and HRC® dosing for full-scale implementation. <br /> 4. Most of the mass of carbon tetrachloride and chloroform pollution is in the B water <br /> bearing zone, which is from about 60 to 70 feet below ground surface and.varies from <br /> about 5 to 10 feet in thickness across the Site. Groundwater contains up to 1,300 <br /> micrograms per liter(µg/1) of carbon tetrachloride and up to 190 µg11 of chloroform. <br /> 5. The Discharger proposes a pilot study to evaluate injection of HRC®to bioremediate <br /> volatile organic compound pollution. Groundwater monitoring of amendments, <br /> breakdown products, and byproducts will continue until concentrations return to <br /> baseline levels, which will conclude the pilot study. The Discharger will install a new <br /> monitoring well downgradient (northwest) of monitoring well MW-3B in the B water <br /> bearing zone as an additional monitoring point to evaluate the HRC®pilot study. The <br /> Discharger proposes to inject HRC® through nine injection points into the B water <br />