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ENVIROMdENTAL HEALTH 'DEPARTMENT <br /> +� SAN JOAQUIN COUNTY <br /> Donna K. Heran, R.E.H.S. Unit Supervisors <br /> :< Director 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. <br /> Laurie A. Cotulla, R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S., R.D.I. <br /> Program Manager <br /> Qrr' oaN` Telephone: (209)468-3420 Douglas W.Wilson, R.E.H.S. <br /> Margaret Lagorio,R.E.H.S. <br /> Fax: (209)464-0138 Robert McClellon, R.E.H.S. <br /> Website:www,sjgov.org/ehd/ Jeff Carruesco, R.E.H.S. <br /> DON PRATT JUN a 2006 <br /> ENVIRONMENTAL BUSINESS MANAGER <br /> ARCO PRODUCTS COMPANY <br /> PO BOX 1257 <br /> SAN RAMON CA 94583 <br /> RE: ARCO Station #6080 SITE CODE: 0712 <br /> 85 Louise Avenue <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 /> remaining soil and groundwater contamination. 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 Johnson-Ettinger model (Tier 2) using site specific inputs. <br /> Groundwater is.fairly shallow at the site (<10 feet below surface grade)so potential soil <br /> vapor migration should be addressed in the assessment. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Lori Duncan, Senior REHS Margaret agorio, Supervising REHS <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: James Barton, CVRWQCB <br /> Rusty Benkosky, Secor International Inc. <br />