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Ripon Farm Service Incorporated Page 2 <br /> 932 South-Highway 99 June 20, 2008 <br /> Ripon, California 95366 <br /> 4 The Central Valley Regional Water Quality Control Board (CVRWQCB) is requiring <br /> evaluation of Environmental Screening Levels (ESLs), California Human Health Screening <br /> Levels (CHHSLs), (San Francisco Bay Regional Water Qualiiy Control Board) and the <br /> potential for vapor intrusion into buildings for closure consideration of sites having residual <br /> contamination left in place. Therefore, you are directed to evaluate the potential for vapor <br /> intrusion inside the buildings located onsite. Please submit a work plan to EHD by August <br /> 29, 2008, to assess the potential for vapor intrusion into the existing onsite buildings, or <br /> provide a rational, with technical support, for discounting vapor intrusion into the buildings <br /> as a potential hazard for this site. <br /> Please contact Vicki McCartney, Senior Registered Environmental Health Specialist, at <br /> (209) 468.9852 or by email at vinccartneyCuisjcetxl.corn if you have any questions, <br /> Sincerely, <br /> Victoria L. McCartney, REHS Nuel C. Henderson, Jr.,PG <br /> Senior Registered Environmental Healt Specialist Engineering Geologist <br /> c: Mr. William R. Little, Advanced GeoEnvironmental,l)Inc., 837 Shaw Road, Stockton, <br /> .P <br /> California 95215 <br /> a <br /> Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central <br /> Valley Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670 <br />