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ATC Associates Inc. <br /> 1117 Lone Palm Avenue,Suite 201 <br /> v Modesto,California 95351 <br /> 209-579-2221 <br /> r <br /> A's S Q.G 3 A T.E'?S. 1'N G.:. <br /> fax:209-579-2225 <br /> i� <br /> inhalation risk evaluation, prepared pursuant to 'DTSC (DTSC, December 2004 and modified <br /> February 4, 2009), demonstrated that the cancer risk for the receptor group from outdoor sub- <br /> grade vapors collected at four feet bgs does not exceed one in one million (10-6). The modeled <br /> cumulative cancer risk of 5.5E-07 does not exceed 1:0E-06, which indicates that the <br /> compounds detected in the soil vapor beneath the subsurface do not pose unacceptable risk <br /> using the modeling default and site specific data values, where applicable, to human health <br /> based standards. Additionally, the DTSC hazard index of 1.0 was not exceeded as reported by <br /> the modeling results of 8.3E-03. <br /> Based on results of the Tier 1 and Tier 2 evaluations, human health and/or the environment do <br /> not appear to be at risk and additional soil vapor evaluation with regard to Diesel Performance <br /> does not appear to be warranted. <br /> Please contact our office at(209) 579-2221 if you have questions or comments. <br /> Respectfully submitted, <br /> ATC Associates Inc. i <br /> i <br /> 3 <br /> Jim Kundert - <br /> rStaff Geologist �-VESS/' <br /> ' �� ANNE <br /> C6 <br /> Jeanne Hornsey, P.E. I�ICi•Ct34741f1 <br /> CA Professional Engineer No. C47410va <br /> cp. I i`.zj'ii .' <br /> yk .. <br /> Attachments F•� iC `1Fa <br /> Lcc: Ms. Lori Shields, Diesel Performance <br /> Mr. Jim Barton, RWQCB <br /> I <br /> S:\Environmental\62577\Reports\2011 Soil Gas.doc 8 ATC Associates Inc. <br />