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ERI 205503 R03 ToscQ7(ServictStation-5886.,Stockton.California _ JUM 9 1999 <br /> RECOMMENDATIONS <br /> Based upon the results of this investigation, ERI recommends the following <br /> IPerform four consecutive quarters of groundwater monitoring and sampling Groundwater samples <br /> collected from on-site monitoring wells MW1 through MW7S & D and newly installed off-site wells <br /> MWBSIIID through MWIOS/l/D should be analyzed for TPPHg, BTEX, and TEPHd, and the five <br /> oxygenated compounds MTBE, tertiary butanol, di-isopropyl ether (DIPS), ethyl tertiary butyl <br /> ether (ETBE), and tertiary amyl methyl ether (TAME) <br /> LIMITATIONS <br /> This report was prepared in accordance with generally accepted standards of environmental practice in <br /> California at the time this investigation was performed This investigation was conducted solely for the <br /> purpose of evaluating environmental conditions of the soil and groundwater with respect to petroleum <br /> hydrocarbons and gasoline-related constituents No soil engineering or geotechnical references are <br /> Iimplied or should be inferred <br /> ERI recommends that a copy of this report be forwarded to <br /> Mr Ronald Rowe, Sr <br /> Site Mitigation Unit <br /> San Joaquin County Public Health Services <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Mr Mark List <br /> Central Valley Regional Water Quality Control Board <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827-3098 <br /> Mr Thomas Skok <br /> Assistant General Counsel <br /> Tosco Marketing Company <br /> 1500 North Priest Drive <br /> Tempe, Arizona 85281 <br /> 5 <br />