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Y <br /> Former Thiemann's Service Station Page 2 <br /> 106 West Second Street October 12, 2010 <br /> Ripon, California 95366 <br /> • Soil concentrations of TPH-g and BTEX have continued to decrease in the vadose <br /> zone of the source area through natural bioremediation since 1998. <br /> Missing from this.addendum is a tier 2 evaluation based on site specific conditions of the <br /> hazards and risks to human health and the environment from residual contaminant <br /> concentrations that exceed the ESLs for gross contamination and direct exposure. Submit <br /> an evaluation of the soil data compared to the ESLs and demonstrate that there is no <br /> significant threat,posed by these petroleum hydrocarbon contaminants. (Please note that <br /> the.ESL for benzene is 0.044 milligrams per kilogram (mg/kg), not 0.0044 mg/kg.) <br /> The EHD believes this site maybe ready for closure but needs the risk assessment for <br /> current site conditions. Submit a closure summary report that addresses the issues k <br /> presented above to the EHD by 14 December 2010. i <br /> f <br /> If you have any questions concerning this letter, please contact Vicki McCartney at (209) <br /> 468-9852, or by email at vmccartney(a)sicehd.com. <br /> i <br /> Sincerely, <br /> Victoria L. McCartney, REHS Nuel C. Henderson, Jr., PG 4 <br /> Registered Environmental Health Specialist Engineering Geologist k <br /> s <br /> c: Mr. John Sellman, ATC Associates Incorporated, 1117 Lone Palm Avenue, Suite <br /> 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 <br /> 95670 <br />