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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> p? .c M Donna Heran, REHS <br /> .o� <br /> 600 East Main Street <br /> PROGRAM COORDINATORS <br /> Stockton, California 95202-3029 Robert McClellon,REHS <br /> LISt� _ Jeff Carruesco, REHS, RDI <br /> --�; Kasey Foley,REHS <br /> • CN .,--s-. �P Website: WWW.Sjgov.org/ehd Linda Turkatte,REHS <br /> 4ctFpa� Phone: (209) 468-3420 <br /> Fax: (209) 464-0138 <br /> January 18, 2011 <br /> Mr. Paul Zumberge <br /> Frontier Transportation, Incorporated <br /> 3577 West Philadelphia <br /> Chino Hills, California 91710 <br /> Subject: Frontier Transportation, Incorporated <br /> 425 Larch Road <br /> Tracy, California 95376 <br /> Dear Mr. Zumberge: <br /> By electronic mail dated 14 December 2010, your consulting firm, Ami Adini & Associates, Inc. <br /> (AA&A), submitted a Human Health Risk Assessment (HHRA) using soil gas concentrations <br /> collected in January 2000, to the San Joaquin County Environmental Health Department <br /> (EHD). By letter dated 11 October 2010, the EHD had directed the submittal of the HHRS <br /> based on the concentrations of chemicals of concern detected in soil gas samples during the <br /> soil vapor study completed in January 2000,. Upon review of the HHRA, the EHD concludes <br /> that the findings do represent an unacceptable health risk. Soil gas concentrations of <br /> benzene and methyl tertiary-butyl ether (MTBE) exceeded the residential and commercial <br /> Environmental Screening Levels (ESLs) established by the San Francisco Bay Regional <br /> Water Quality Control Board, and the California Human Health Screening Levels (CHHSLs) <br /> published by the Office of Environmental Health Hazard Assessment for the California <br /> Environmental Protection Agency; also modeling, using the Department of Toxic Substances <br /> Control version of the Johnson and Ettinger Model, indicates that the cancer risks exceed one <br /> in one million. Based on these findings, the EHD directs that the three additional soil gas <br /> samples, conditionally approved by this department by letter dated 11 October 2010, be <br /> collected. Please submit a boring permit application and permit/inspection fee of $488 to the <br /> EHD and complete the collection of soil gas samples (including one duplicate soil gas sample <br /> collected in a Summa T11 canister)from boreholes SV1 through SV3 by 31 March 2011. <br /> The EHD reviewed Domestic Well Sampling Report, dated 20 August 2010, prepared and <br /> submitted by AA&A. Only two of the seven proposed domestic wells were sampled and <br /> analyzed for chemicals of concern. The remaining five wells were either inaccessible or <br /> abandoned. Groundwater analytical results indicate that chemicals of concern were not <br /> detected in either well. Based on these results, the EHD believes that any additional domestic <br /> well investigation is not necessary. <br />