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Cop y <br /> PUBLIC AALTH SERVI IES f i N <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION ". <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> cq.yN�P <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 FSR <br /> 209/468-3420 <br /> NICK NICKERSON <br /> UNOCAL DBG AMG MAR 14 2001 <br /> 8788 ELK GROVE BOULEVARD <br /> BUILDING 3 SUITE 15 <br /> ELK GROVE CALIFORNIA 95624 <br /> RE: Former Unocal Service Station#0187 SITE CODE: 1181 <br /> 437 Miner Avenue <br /> Stockton,CA <br /> San Joaquin County Public Health Services,Environmental Health Division(PHS/EHD)has reviewed the <br /> "Monitoring Well Installation Report,Vapor Extraction Pilot Test Report,and Interim Remedial Action <br /> Plan"(report)submitted to this office on December 26,2000 by Gettler-Ryan,Inc.(GRI). The report <br /> details that petroleum hydrocarbon contamination was detected in groundwater samples collected from <br /> monitoring wells U-19 and U-21 located downgradient from the site. The lateral extent of petroleum <br /> contamination in"Zone C'has not been delineated. <br /> The lateral extent of petroleum contamination in Zone C will need to be defined. GRI recommended that <br /> groundwater samples should be collected for two additional quarters(fust and second quarters of 2001), <br /> prior to making recommendations for subsequent investigations at this site. PHS/EHD agrees with this <br /> approach. However,we will want to meet with you and GRI,either by telephone or at this office, <br /> following the submittal of the First Quarter 2001 report,to evaluate the significance of the findings. <br /> Please note that this case has been reassigned to Dot Lofstrom. You may address all future correspondence <br /> involving Unocal#0187 to her. You can also call her at(209)468-3436. <br /> Donna Henna,RENS,Director <br /> Environmental Health Division <br /> Dot Lofstrom, .G. <br /> LOP/Unit IV Site Mitigation Unit <br /> cc: Marty Hartzell,CVWRQCB <br /> Greg Gurss,GRI <br /> A Division of San Joaquin County Health Care Services <br />