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Lori Duncan EH <br /> i <br /> From: Margaret Lagorio [EH] ' <br />{ Sent: Wednesday, May 31, 2006 3:32 PM <br /> To: Lori Duncan [EH] <br /> Subject: FW: 85 Louise Ave, Lathrop <br /> Lori; <br /> Can you write a letter. to ARCO and tell them CVRWQCB cannot concur with closure of their <br /> site until the soil contamination remaining has been evaluated for vapor emissions, direct <br /> exposure and gross; contamination since the levels exceed the SFBRWQCB ESL's.- . Suggest. they <br /> use the Johnson-Ettinger model. Thanks. <br /> Margaret <br /> _--Original Message-- -- <br /> From: Jim Barton [mailto:jbarton@w aterboards.ca.gov] <br /> Sent: Wednesday,. May 31,. 2006 1:13_ PM <br /> To: Margaret Lagorio [EH] <br /> Subject: 85. LouiseLAVe,. Lathrop <br /> Hi Margaret, <br /> I forgot to mention this"morning that I will need an assessment for the Xylenes (950 <br /> mg/kg) and TPHg (9,800, mg/kg) -. .Soil ESLs (TIER 1) exceedances for Vapor Emissions, <br /> Direct Exposure and Gross Contamination. I would prefer the consultant address these J <br /> issues using a Johnson-Ettinger model. (TIER 2) with site specific inputs. Groundwater is <br /> fairly shallow at the site (<101 ) so potential. soil vapor migration should be addressed' in <br /> the assessment. <br /> 4 <br /> I know that ,the first question to me will be why are the After. confirmation +'soil samples <br /> for overexcavation hotter for TPHg and xylenes than the Before piping upgrade soil <br /> samples. <br /> I will also need your comment that. Public Participation has been addressed. <br /> Please contact. me if you have any questions.. <br /> Thanks. <br /> i <br /> Jim <br /> James L.L. Barton, P.G. <br /> Engineering. Geologist <br /> California Regional: Water_ Quality. Control Board f <br /> Central Valley. Region, <br /> 11020 Sun Center Drive, Suite 200, <br /> Rancho Cordova, CA 95670 <br /> office (916). 464-4615 1 <br /> fax (916) 464-4704 t <br /> i <br /> 1 ' <br />