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r _ <br /> Former Thiemann's Service Station Page 2 <br /> 106 West Second Street September 24„2009 <br /> Ripon, California 95366 <br /> In Soil Vapor Study dated May 7, 2008 ATC compared soil gas concentrations collected <br /> from soil boring SG3 and historical groundwater concentrations collected from this site to <br /> Environmental Screening Levels (ESLs) from Tables E and A, respectively, of the San <br /> Francisco Bay Regional Water Quality Control Board document Screening for <br /> Environmental Concerns at Sites with Contaminated Soil and Groundwater — November <br /> 2007 (revised 2008). ATC also compared soil gas concentrations collected from soil <br /> boring SG3 to California Human Health Screening Levels (CHHSLs). ATC concluded that <br /> human health and the environment did not appear to be at risk; however, ATC did not <br /> compare the residual contaminant concentrations of TPH-g, benzene, toluene, ethyl <br /> benzene, and total xylenes (BTEX), to ESLs and CHHSLs. Please submit this <br /> information, along with estimates of the residual TPH-g and BTEX masses in soil and <br /> groundwater to the EHD by November 30, 2009. <br /> If you have any questions concerning this letter, please contact Vicki McCartney at (209) <br /> 468-9852, or by email at vmccartney(cD-sicehd.corn. <br /> Sincerely, <br /> Victoria L. McCartney, RENS Nuel C. Henderson, Jr., PG <br /> Registered Environmental Health Specialist Engineering Geologist <br /> c: Mr. Nathan Christman, PG, ATC Associates Incorporated, 1117 Lone Palm Avenue, { <br /> Suite 201, Modesto, California 95351 <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 /> J <br />