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i <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUN'T'Y <br /> Ursa rve <br /> Snpesors <br /> Donna K Ideran, R E H S <br /> Directy> 304 East Weber Avenue,Third Floor Carl Borgman R E H S <br /> y Stockton California 95202-2708 N ibe Huggins R E H S R D I <br /> Al Olsen, R E H S Douglas W Wilson R E H S <br /> • C, �P• Program Mnirager Telephone (209)468-3420 Margaret Lagorio R E H S <br /> q�rFDpr� Laurie A Cotuila, R E H S <br /> Fay, (209) 464-0138 Robert McClellon R E H S <br /> Pingfaur Manage' Jeff Carruesco R E H S <br /> `Website www sjgov org/ehd/ <br /> PAUL SUPPLE NQV 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 /> uHS <br /> Lon Duncan, Senior REHS Margaret Lagorio, Spervising RE <br /> LOP/Site Mitigation Unit IV LOPISite Mitigation Unit IV <br /> cc .dames Barton, PG, CVRWQCB <br /> Vern Elarth, URS Corporation <br />