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PUBLIC H?ALTH SERVIA!S <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer �. <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> NICK NICKERSON MAY 0 7 2001 <br /> UNOCAL CORPORATION <br /> 8788 ELK GROVE BOULDEVARD <br /> BUILDING 3 SUITE 15 <br /> ELK GROVE CALIFORNIA 95624 <br /> RE: Former Unocal Service Station SS#0187 <br /> 437 East Miner <br /> Stockton,CA 95202 <br /> San Joaquin County Public Health Services,Environmental Health Division received the"Groundwater <br /> Monitoring and Sampling Report,First Quarter—Event of February 26 and 27,2001"(report),submitted <br /> on your behalf by Gettler-Ryan,Incorporated(Gettler-Ryan)on April 11,2001. It is evident upon reading <br /> the report that the ozone micro-sparging system installed by Gettler-Ryan in December 2000 is affecting <br /> the concentration of petroleum hydrocarbons in the groundwater. Concentrations of hydrocarbons appear <br /> to be increasing in the more shallow wells and decreasing in the intermediate and deeper wells. Dot <br /> Lofstrom of PHS/EHD and Gregg Gurss of Gettler-Ryan discussed the significance of the monitoring <br /> results in a telephone conversation on May 4,2001,and agreed that not enough data have been collected to <br /> derive meaningful conclusions from the analytical results as of yet. <br /> Ms. Lofstrom and Mr.Gurss also discussed the ozone micro-sparging system evaluation report that is <br /> currently scheduled to be submitted to PHS/EHD in June 2001. They agreed that the evaluation would be <br /> more useful if completed after receipt of the second quarter of analytical data. Therefore,the system <br /> evaluation report will be submitted to PHS/EHD in August 2001 and will incorporate the fust and second <br /> quarters of groundwater monitoring data. Second quarter groundwater sampling is scheduled for May 7, 8, <br /> and 9,2001. <br /> If you have any questions regarding these matters,please do not hesitate to call Dot Lofstrom at(209)468- <br /> 3436. <br /> Donna Heran,REHS,Director <br /> Environmental Health Services <br /> zoefi , <br /> Dot Lofstrom,R. . <br /> LOP/Site Mitigation Unit <br /> cc: Marty Hartzell <br /> Gregg Gurss—Gettler-Ryan. <br /> A Division of San Joaquin County Health Care Services <br />