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ENVIRONMENTAL HEALTH DEPARTMENT <br /> o�a"'" SAN JOAQUIN COUNTY <br /> UnitSupervisors <br /> Donna K Heran,R.E H.S. Carl Borgznan,R E H S <br /> K Director 304 East Weber Avenue, Third Floor <br /> • RX—H.S. Stockton, California 95202-2708 Mike las W s,R o H S,R D I <br /> Al Olsen,R <br /> • c� . . �� gDouglas� Wilson,R E H S <br /> Program Manager <br /> Laurie A.Comilla, ger H S. 'Telephone. (209) 468-3420 Margaret Lagono,R.E H S <br /> Program Manager Fax: (209) 464-0138 Robert McClellon,R E H S <br /> Mark Barcellos,R E H S <br /> PAUL SUPPLE NOV 17 2003 <br /> ARCO PRODUCTS COMPANY <br /> P 0 Box 6549 <br /> MORAGA CA 94570 <br /> RE ARCO <br /> 225 Cherokee 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 to 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 /> _W\A_A_ jvl_� <br /> Margaret Lagono, Supervising REHS <br /> Site Mitigation Unit <br /> C URS—Vernon Elarth <br /> CVRWQCB--Jim Barton <br />