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FILEPY <br /> H .ALTH SERVIC -PUBLIC <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer c =.;._.,ri=aR <br /> -- p <br /> � <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 2091468-3420 ' <br /> KAREN PETRYNA MAR 1 <br /> EQUIVA SERVICES LLC <br /> P O BOX 7869 <br /> BURBANK CA 91501-7869 <br /> Site Code: 1417 <br /> RE: Shell Oil Company <br /> 3725 Tracy Blvd. <br /> Tracy, CA 95376 <br />'k San Joaquin County Public Health Services, Environmental Health Division (PHD/EHD) is the <br /> lead agency providing the oversight of the investigation and cleanup of releases from <br /> underground storage tanks (UST)within San Joaquin County. PHSIEHD has a contract with <br /> California State Water Resources Control Board to conduct an underground storage tank <br /> corrective action program. The above referenced site was placed in the PHSIEHD Local <br /> Oversight Program (LOP) in August, 1989, due to an unauthorized release that was discovered <br /> during UST and piping removal. <br /> PHSIEHD recently reviewed a Groundwater Monitoring Report prepared by Cambria <br /> Environmental Technology, Inc. which documents MTBE contamination in groundwater in three <br /> existing on-site monitoring wells and one observation well in the USG backfill. MTBE <br /> concentrations have been as high as 148,000 micrograms per liter in groundwater analyzed. <br /> You are directed to conduct a groundwater investigation that will define the vertical and lateral <br /> extent of contamination. Please submit a work plan that will define the full extent of the plume by <br />` April 30, 2001. <br /> If you have any further questions regarding this matter, contact Harlin Knoll at(209)468-3442. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Harlin Knoll, Senior REHS Dot Lofs rom, R.G. <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> Enclosure <br /> Cc: CRWQCB -Marty Hartzell <br /> CAMBRIA-Joe Neeley <br /> t - <br /> i A Division of San Joaquin County Health Care Services <br />