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ENVIRONMENTAL HEALTH bEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Sa <br /> Donna K. Heran, R.E.H.S. Pervisors <br /> N: <br /> Director 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. <br /> Al Olsen, R.E.H.S. Stockton,California 95202-2708 Mike Huggins. R.E.H.S., R.D.J. <br /> Douglas W. Wilson, R.E.H.S. <br /> C, .. �P Program Manager Telephone: (209}468-3420 <br /> 4�lFo.R�a \largaret Lagorio,R.E.H.S. <br /> Laurie A. Cotulla, R.E.H.S. <br /> Progran? Manager Fax: (209) 464-0138 Robert McClellon. R,E.H.S. <br /> Website:www.sjgov.org/ehd/ Jeff Carraesco, R.E.H.S. <br /> PAUL SUPPLE NOV 2 8 2005 <br /> ATLANTIC RICHFIELD COMPANY <br /> PO BOX 6549 <br /> MORAGA CA 94570 <br /> RE: ARCO Station #6080 SITE CODE: 0712 <br /> 85 Louise Avenue <br /> Lathrop CA 95330 <br /> San Joaquin County Environmental Health Department (SJC/EHD) has reviewed the file <br /> for the above referenced contaminated underground storage tank (UST) site and has the <br /> following comments. <br /> Following discovery of petroleum hydrocarbon contaminated soil during a dispenser <br /> upgrade this site was placed into the San Joaquin County Local Oversight Program. Site <br /> investigation began with the June 2000 installation of three-groundwater monitoring wells <br /> onsite. These wells have been sampled quarterly since installation; groundwater samples <br /> have been analyzed for petroleum hydrocarbon constituents and fuel oxygenates. The <br /> main contaminant of concern has been methyl tertiary butyl ether (MtBE). Concentrations <br /> of MtBE in the groundwater samples have been non-detect in MW-3 and at or below the <br /> maximum contaminant level for MtBE in public drinking water in MW-2 and MW-1 for over <br /> three years. <br /> Please have your consultant prepare a closure report for this site. The report should <br /> include all information listed in the Tri-Regional Board Staff Recommendations Appendix <br /> A, No Further Action Required Documentation, a receptor survey and calculations of <br /> contaminant mass remaining in both soil and groundwater. <br /> If you have any questions please call Lori Duncan at (209)468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Lori Duncan, Senior REHS Marg�Lagouperyising REHS <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: James Barton, PG, CVRWQCB <br /> Vern Elarth, URS Corporation <br />