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Y r San Joaquin County OPgU,IM C Environmental Health Department D/RECTOR ?' --•�` 'A Donna Heren,RENS 600 East Main Street } { Stockton, California 95202.3029 PROGRAM COORDINATORS .q Robert McClellon,REHS • -- -------- Jeff Carruesco,REHS,RDI Kasey o'' •�;�P g i p p R Foley,REHSWebsite:www.sjgov.orglehd Linda Turkatte,REHS Phone: (209)468-3420 Fax: (209) 464.0138 t^ld)G� 1AN ? 1 2tfSi January 18, 2011 Mr. Paul Zumberge Frontier Transportation, Incorporated 3577 West Philadelphia Chino Hills, California 91710 Subject: Frontier Transportation, Incorporated 425 Larch Road Tracy, California 95376 Dear Mr. Zumberge: By electronic mail dated 14 December 2010, your consulting firm, Ami Adini &Associates, Inc. (AA&A), submitted a Human Health Risk Assessment (HHRH) using soil gas concentrations collected in January 2000, to the San Joaquin County Environmental Health Department (EHD). By letter dated 11 October 2010, the EHD had directed the submittal of the HHRS based on the concentrations of chemicals of concern detected in soil gas samples during the soil vapor study completed in January 2000,. Upon review of the HHRH, the EHD concludes that the findings do represent an unacceptable health risk. Soil gas concentrations of benzene and methyl tertiary-butyl ether (MTBE) exceeded the residential and commercial Environmental Screening Levels (ESLs) established by the San Francisco Bay Regional Water Quality Control Board, and the California Human Health Screening Levels (CHHSLs) published by the Office of Environmental Health Hazard Assessment for the California Environmental Protection Agency; also modeling, using the Department of Toxic Substances Control version of the Johnson and Ettinger Model, indicates that the cancer risks exceed one in one million. Based on these findings, the EHD directs that the three additional soil gas samples, conditionally approved by this department by letter dated 11 October 2010, be collected. Please submit a boring permit application and permitlinspection fee of$488 to the EHD and complete the collection of soil gas samples (including one duplicate soil gas sample collected in a SummaM canister)from boreholes SV1 through SV3 by 31 March 2011. The EHD reviewed Domestic Well Sampling Report, dated 20 August 2010, prepared and submitted by AA&A. Only two of the seven proposed domestic wells were sampled and analyzed for chemicals of concern. The remaining five wells were either inaccessible or abandoned. Groundwater analytical results indicate that chemicals of concern were not detected in either well. Based on these results,the EHD believes that any additional domestic well investigation is not necessary.