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ENVIRONMENTAL HEALTH EPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Donna K. Her9n'R.E.H.S. Unit 5upervisorg <br /> 304 East Weber Avenue,Third Floor Carl 8or man,R.F.H.s. f <br /> Director g <br /> Laurie A. Cotulla', R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S., R.D.I. <br /> •:' <br /> Program Manager Douglas W. Wilson, R.E.H.S. n <br /> r4y"-.:",,::,app• Telephone: (209)468-3420 <br /> FOMargaret Igorio,R.E.H.S. <br /> �7R <br /> Fax: (209) 464-0138 Robert McClellon, R.E.H.S. <br /> Website:wwtv.sjbov.orgT/elid/ Jeff Carruesco, R.E.H.S. <br /> j <br /> DON PRATT ,UN Q 1 2006 <br /> 's <br /> ENVIRONMENTAL BUSINESS MANAGER <br /> ARCO PRODUCTS COMPANY <br /> a, <br /> PO BOX 1257 <br /> SAN RAMON CA 94583 '. <br /> RE: ARCO Station ##6080 SITE CODE: 0712 <br /> 85 Louise Avenuer <br /> Lathrop CA 95330 <br /> The Regional Water Quality Control Board, Central Valley Region (CVRWQCB) has <br /> informed San Joaquin County Environmental Health Department (SJC/EHD) that to <br /> continue review for closure of the above referenced contaminated underground storage <br /> tank (UST) site they need an assessment of the soil contamination remaining at the site <br /> for vapor emissions, direct exposure and gross contamination. <br /> CVRWQCB uses the San Francisco Bay Regional'Water Quality Control Boards Tier I <br /> Environmental Screening Levels (ESL's) to evaluate the risk for vapor intrusion from. , <br /> ir <br /> remaining soil and groundwater contafnination. This site exceeds the ESL's for xylenes <br />' and total petroleum hydrocarbons as gasoline (TPHg). CVRWQCB has recommended <br /> you address this issue using a Johnsdn-Ettinger model (Tier 2) using site specific inputs. <br /> Groundwater is fairly shallow at the site (<10 feet below surface grade) so potential sail " <br /> vapor migration should be addressed in the assessment. <br /> 4. <br /> Donna Heran, REHS, Director. <br /> o � <br /> Environmental Health Department ff <br /> Lori Duncan, Senior REHS Marga�agorio,Vtupervising REHS <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV ' <br /> i <br /> cc: James Barton, CVRWQCB i; <br /> Rusty Benkosky, Secor International Inc. <br /> ' JUN. « ' LUJa <br /> Y --------------------- <br />