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