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' ENVIRONMENTAL HEALTH DEPARTMENT <br /> oPa""� SAN JOAQUIN COUNTY <br /> � Unit Supervisors <br /> Donna K Heran,&E H S' r Director 304 East Weber Avenue, Third Floor Carl Borgman,R E H s <br /> T Al Olsen,R E H S Stockton, California 95202-2708 MikelasWHuggins,R o H S ,R D 1 <br /> • o r P <br /> Program Manager Douglas W Wilson,it E H S <br /> 4tr�oga• g g Telephone (209) 468-3420 MargaretLagorro,REHS <br />' Laurie A Cotulla,R E H S FaX (209) 464-0138 Robert McClellon,R E H S <br /> Program Manager Mark Barcellos,R E H S <br /> PAUL SUPPLE 140V 1'7 2003 <br /> ARCO PRODUCTS COMPANY <br /> P 0 BOX 6549 <br /> MORAGA CA 94570 <br /> RE ARCO <br /> 225 Cnerokee Lane <br /> Lodi, CA <br /> San Joaquin County Environmental Health Department (EHD) has reviewed the <br /> "Quarterly Groundwater Monitoring" reports dated July 7, 2003 and October 20, 2003, <br /> prepared by URS Corporation for the above referenced site A"no further action <br /> required" letter from EHD dated July 13, 1998, was provided for this site for underground <br /> storage tanks that were removed from the site in September 1988 and June 1991 The <br /> site investigation at that time did not include investigating for 1,2-DCA <br /> The analytical results of the groundwater samples collected from October 2002 through <br /> July 2003, from the three on site monitoring wells, confirm that there is a 1,2-DCA <br /> contaminant plume at this site The City of Lodi has a well within 1000 feet of the site <br /> Since the results for 1,2-DCA are confirmed to be substantially over the Maximum <br /> Contaminant Level for drinking water for this chemical, you are required to define the <br />' lateral and vertical extent of the ground water contaminant plume. EHD will open the <br /> current closed case on Geotracker and place the site in the Local Oversight Program <br />' Submit a work plan to EHD to investigate the lateral and vertical extent of the 1,2-DCA <br /> contaminant plume by January 13, 2004 <br /> For your information, there is a site at 16 S Cherokee, Lodi, that also has a 1,2-DCA <br />' contaminant plume A review of that site information may be useful in planning the <br /> investigation for this site <br />' If you have any questions contact me at (209) 468-3449 <br /> Donna Heran, REHS <br /> Director of Environmental Health <br /> Margaret Lagorio, Supervising REHS <br /> Site Mitigation Unit <br />' c URS—Vernon Elarth <br /> CVRWQCB—Jim Barton <br />