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California Regional Water Quality Control Board <br /> Central Valley Region <br /> Robert Schneider,Chair <br /> Winston Ii. Fiickox Gray Davis <br /> Secretaryfor Sacramento Main Office Governor <br /> Environmental Internet Address: http7/w .svr b.ca.gov`— gcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827.3003 <br /> Phone(916)255-3000•FAX(916)255-3164 <br /> 3 July 2002 <br /> 9z :z Wd 6- Mr zo <br /> Mr. Mike Lecision i <br /> Diamond Walnut Growers Inc. <br /> dba Diamond of California ' <br /> 1050 South Diamond Street <br /> Stockton, California 95201 <br /> REVIEW OF RESPONSE TO COMMENTS,DIAMOND WALNUT GROWERS, <br /> STOCKTON PLANT, SAN JOAQUIN COUNTY <br /> We have reviewed the 29 May 2002 Response to Review of Monitoring Report and Subsurface <br /> Investigation Results (Response Report) submitted by ATC Associates Inc. (ATC), on behalf of <br /> Diamond Walnut Growers Inc. (DWG) for its Stockton Plant. Monitoring well MW-3 contained <br /> 6,600 µg/1 of hexavalent chromium during the first quarter sampling event on 16 January 2002. <br /> The Response Report includes comments on the draft Monitoring and Reporting Program(MRP) <br /> that was sent to you on 12 April 2002. We have the following comments on the Response Report. <br /> 1. In the Response Report, ATC requests that we remove chlorodifluoromethane from the list of <br /> -analytes and we have done so. Chlorodifluoromethane may not have contaminated the <br /> groundwater at this location because of the greater depth to groundwater and the compound's . <br /> physical properties. However, in a 10 July 2001 Memorandum from you,this and other <br /> compounds where listed as being used on-site. It is DWG's responsibility to develop an <br /> effective remedial treatment for the groundwater pollution. Thus,DWG must fully <br /> characterize the groundwater so that it can conduct an effective review of treatability options <br /> during the feasibility study. The presence of other pollutants may negatively influence <br /> optimization of a future selected remedy. <br /> 2. The MRP is a Regional Board Order issued by the Executive Officer. You may request <br /> modifications to the MRP and a Board staff will develop a revised MRP. However, the <br /> Executive Officer must approve the revised MRP before changes are implemented. <br /> California Environmental Protection Agency <br /> Qd Recycled Paper <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. For a list of <br /> simple ways you can reduce demand and cut your energy costs,see our Web-site at bttp://www.swreb.ca.gov/mgcb5 <br />