SITE INFORMATION AND CORRESPONDENCE

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• N FACT SHEET Continental Grain Company French Camp Grain Elevator Groundwater RVr � ? e 9504 South Harlan Road f, L French Camp, California July 2009 J J L 2d ? 20C9 BACKGROUND ABOUT THE WHAT HAWru0YWE'NYA'L 64"DONE TO FRENCH CAMP GRAIN ELEVATOR SITE PROTECT CALF3tt1111'$WXER RESOURCES? The French Camp Grain Elevator, at 9504 South Extensive investigations have determined that no soil Harlan Road, French Camp, is an operating grain contamination exists on the site, eliminating concern storage and transfer facility located about five miles that groundwater continues to be impacted. south of Stockton, in San Joaquin County. Prior to 1980, fumigant dissolved in carbon tetrachloride (CT) Upon discovering the groundwater contamination, was stored and used at the site. In 1999, evidence of CGC removed two private water supply wells at the groundwater contamination from CT was discovered facility which now receives drinking water from the during an environmental site assessment. municipal water supply system. CGC has investigated the location and use of surrounding water supply Since 1999, Continental Grain Company (CGC), wells. The closest domestic water supply well is formerly known as ContiGroup Companies, has been nearly 500 feet north of the site, and the nearest responsible for directing site investigation activities at municipal water supply well is located approximately the site. Between 1999 and 2004, a number of one mile north of the site. Groundwater contamination investigations were completed to determine the extent does not extend to these distances; the municipal of the groundwater contamination, and identify water supply has not been affected by the potential remedial approaches. Since 2001, various contamination. groundwater remediation activities have been undertaken, and in 2004, the Regional Water Quality CGC has responded aggressively to this groundwater Control Board (Water Board) approved an in-situ issue and has worked diligently to ensure the problem remediation approach using Granular Zero-Valent is properly investigated, efforts to remediate the site Iron (GZVI). In 2005, this remediation effort was continue without delay, and that the groundwater initiated, and regular monitoring since has contamination does not adversely affect neighboring demonstrated this remedial approach to be effective businesses. in reducing concentrations of CT in groundwater at the site. In 2007, in an effort to increase the pace of WHAT IS NEEDED TO CONTINUE the groundwater remediation, a pilot study was TO REMEDIATE THIS SITE? proposed and approved by the Water Board to recirculate groundwater through the in-situ treatment CGC has submitted a Remedial Action Plan, updated zone. in April 2009, which describes the proposal to start operating a second recirculation system that was RECENT AND PROPOSED SITE ACTIVITIES constructed in conjunction with the pilot system. CGC seeks to obtain from the Water Board a new Waste During 2008, the approved pilot study was conducted Discharge Requirements (WDR) permit to start and successfully demonstrated groundwater operating the second recirculation system recirculation to be effective in enhancing the concurrently with continued operation of the pilot remediation effort. The pilot system was started in system. Both systems will be operated in accordance May 2008 and has operated continuously with no with requirements set forth by the Water Board, which significant malfunctions or other operational issues. includes regular groundwater testing, and filing Groundwater monitoring was conducted monthly for reports providing test results to the Water Board on a four consecutive months and CT concentrations in regular schedule. As required by California down gradient wells have shown declines. In regulation, the Water Board provides public access to accordance with Water Board rules, CGC is now key reports, including the updated Remedial Action seeking authorization to operate two groundwater Plan, through the Geotracker web site. Information recirculation systems at the site. about how to access Geotracker is provided in the 'For More Information'section of this fact sheet.