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7j%TC <br /> 1117 Lone Palm Avenue, Suite B <br /> 1Modesto, CA 95351 <br /> http Ilwww atcassociates corn <br /> 209 579 2221 <br /> Fax 209 579 2225 <br /> A S S O C I A T E S I N C <br /> January 21, 2005 <br /> 54 62583 0001 <br /> Ms Mary Serra <br /> Regional Water Quality Control Board <br /> 1 1020 Sun Centel Drive #200 <br /> Rancho Cordova, CA 95670-6114 <br /> Subject Bench Scale Treatability Study for Reducing Hexavalent Chromium at Diamond <br /> Walnut Growers, 1050 South Diamond Street, Stockton, California <br /> Dear Ms Serra <br /> ATC Associates Inc is pleased to present the results of a bench scale treatability study for <br /> reducing hexavalent chromium (CrVI) in the subsurface at the above referenced site The bench <br /> scale study was performed to evaluate the potential effectiveness of remedial options under <br /> laboratory conditions prior to implementation in the field Activities included collecting soil and <br /> gioundwater samples from the site, and conducting laboratory testing of the soil and groundwater <br /> media to evaluate the potential of ferrous iron solution and calcium polysulfide to reduce and <br /> stabilize CrVI via injection into the subsurface The attached ieport summaiizes the activities and <br /> results of the bench scale treatability study <br /> If you have questions or comments regarding this report or our recommendations, please cal l us at <br /> yore convenience at (209) 579-2221 <br /> ' Respectfully submitted, <br /> ATC Associates Inc <br /> �� J-,'� `ill ;, f��•�i +fro t�{ <br /> Todd Hafner <br /> 1 <br /> Project Geologist IN <br /> nne Homsey, P E <br /> CA Registered Civil Engineer No 47410 <br /> cc Mr Mike Lescism, Diamond Walnut Growers <br /> Mr Mike Infurna, San Joaquin County Environmental Health Department <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />