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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDER-NO. R5-2004-0160 WASTE DISCHARGE REQUIREMENTS FOR CONTIGROUP COMPANIES, INCORPORATED FRENCH CAMP GRAIN ELEVATOR ENHANCED REMEDIATION PILOT STUDY SAN JOAQUIN COUNTY The California Regional Water Quality Control Board, Central Valley Region(hereafter Regional Board), finds that: 1. ContiGroup Companies,Inc. submitted a Report of Waste Discharge on 28 June 2004 and supplemental information on 3, 9, and 14 July 2004 for a zero valent iron injection 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 1S, Range 6E, Section 2,MDBoM (hereafter referred to as Site). The current owner is French Camp Grain Elevator LLC. The general location of the facility is shown on Attachment A, which is attached hereto and made part of these Waste Discharge Requirements(WDRs), hereafter referred to as Order,by reference. 2. French Camp Grain Elevator LLC is the current owner of the property. ContiGroup Companies, Inc. is hereafter referred to as the Discharger, and both French Camp Grain Elevator LLC and ContiGroup Companies, Inc. are responsible for compliance with this Order. However, since French Camp Grain Elevator LLC is the property owner and ContiGroup Companies, Inc. will be operating the groundwater treatment system and discharging treated groundwater, ContiGroup Companies, Inc. is primarily required to comply with this Order. If ContiGroup Companies, Inc.. does not comply,then within 60 days of notification by the Executive Officer,French Camp Grain Elevator LLC will be required to comply. BACKGROUND 3. Historically, liquid fumigants containing carbon tetrachloride were stored on the Site in five- gallon buckets. Carbon tetrachloride was found in groundwater in 1999. The 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. This Order rescinds Order No. R5-2003-0166. 4. On 17 October 2003,the Regional Board issued WDRs Order No. R5-2003-0166 for a Hydrogen Releasing Compound(HRC®)injection pilot study. Upon further review of the technology and groundwater limitations set by the WDRs, the Discharger determined HRC® injections was not the ideal remedial technology for the Site. 5. Most of the mass of carbon tetrachloride and chloroform pollution is in the B water bearing zone,which is from about 60 to 80 feet below ground surface(bgs) and vanes from about 5 to 15 feet in thickness across the Site. Groundwater contains up to 1,300 micrograms per liter (4g/1) of carbon tetrachloride and up to 190µg/1 of chloroform.