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CaliforriVegional Water Quality Cool Board <br /> l\j Central Valley Region @Wi�V Karl E.Longley,ScD,P.E.,Chair <br /> Linda S.Adams Arnold <br /> Secreta rYf or Sacramento Main Office <br /> 11020 Sun Center Drive#2O0,Rancho Cordova,California 95670-6114 Schwarzenegger <br /> Environmental l Governor <br /> Phone( . acerb a •FAx(916)464-0645 n I� �-, .,E I- <br /> Protection Ilhlll LLL��� 1��%//=U <br /> http://www.waterboarda ca.gov/centralvalley <br /> 4 October 2007 OCT 1 0 2007 <br /> Mr. James Taylor ENVIRONMENT MEHEALTH <br /> ContiGroup Companies <br /> AON Center <br /> 200 E. Randolph, Suite 1900 <br /> Chicago IL 60601 <br /> GROUNDWATER RECIRCULATION PILOT STUDY, FRENCH CAMP GRAIN ELEVATOR, <br /> 9504 S. HARLAN ROAD, SAA{JOAQUIN COUNTY <br /> ContiGroup Companies are evaluating the effectiveness of zero-valent iron injected in April <br /> 2005 into the subsurface to treat carbon tetrachloride, chloroform, 1,2-dichloropropane, and <br /> 1,2,3-trichloropropane in groundwater beneath the French Camp Grain Elevator. The iron <br /> injection was conducted pursuant to Waste Discharge Requirements R5-2004-0160. Two <br /> years after the injection, the data show that it is effective at reducing the concentration of <br /> carbon tetrachloride and chloroform, but the effectiveness is localized at the injection areas. <br /> ContiGroup proposes to evaluate whether groundwater extraction of pollutants downgradient <br /> of the iron and reinjection of this groundwater directly into the iron injection area will accelerate <br /> the treatment rate of the downgradient plume. Documentation of the zero valent iron injection, <br /> ambient groundwater conditions, and the pilot study work plan proposing groundwater <br /> recirculation are contained in the following reports: <br /> • 27 June 2006 Pilot Study Evaluation and Quarterly Report for French Camp Grain <br /> Elevator, prepared by Huff & Huff Inc. and Haley & Aldrich, Inc. <br /> February 2007 Remedial Action Plan for French Camp Grain Elevator prepared by Huff & <br /> Huff Inc. and Haley & Aldrich, Inc. <br /> 26 April 2007 First Quarter 2007 Groundwater Monitoring Report, French Camp Grain <br /> Elevator, prepared by Haley & Aldrich, Inc. <br /> • 3 July 2007 Second Quarter 2007 Report for GZVI Pilot Study, French Camp Elevator, <br /> prepared by Huff & Huff Inc. <br /> The primary pollutant at the site is carbon tetrachloride and its breakdown product, chloroform, <br /> although 1,2-dichloropropane, 1,2,3-trichloropropane, and 1,2-dichloroethane are also present <br /> in groundwater. Pollutants are found in the first water-bearing zone, between about 20 and 30 <br /> feet below ground surface (bgs), although the highest concentrations are in the second water- <br /> bearing zone, encountered between about 60 and 80 feet bgs. <br /> The site is in an agricultural setting, and the groundwater flow direction varies seasonally from <br /> northwesterly to northeasterly in both water-bearing zones. <br /> California Environmental Protection Agency <br /> 0a Recycled Paper <br />