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FILE COPY ' <br /> PUBLIC HEALTH SERVICE 'O PO U,Ip <br /> SAN JOAQUIN COUNTY —" <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 4Ci F0 <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> APR 17 2001 <br /> ED RALSTON' <br /> TOSCO MARKETING COMPANY <br /> 1380 LEAD HILL ROAD SUITE 120 <br /> ROSEVILLE CA 95661 <br /> RE: Tosco Service Station 5886 <br /> 2701 March Lane <br /> Stockton, California <br /> The purpose of this letter is to offer further clarification to the directive issued April 10, 2001 by <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD). The <br /> April 10, 2001 letter directed you to begin monthly monitoring of seven monitoring wells located <br /> at Tosco Service Station 5886, and to analyze the groundwater samples for methyl tertiary butyl <br /> ether(MtBE) using EPA Method 8260. In a subsequent telephone conversation between you and <br /> Dot Lofstom of PHS/EHD, it was agreed that the samples collected for monthly monitoring <br /> could be analyzed for MtBE using EPA Method 8020 instead of 8260. EPA Method 8020 is <br /> appropriate in this case because (1)the groundwater samples will be solely analyzed for MtBE <br /> and will not be analyzed for other oxygenates and, (2) the increased accuracy gained by using <br /> EPA Method 8260 does not contribute significantly towards the goals of the monthly monitoring <br /> exercise. The purpose of the monthly monitoring is to detect analytical trends in MtBE <br /> concentrations, and the additional accuracy that is offered by using EPA Method 8260 over EPA <br /> Method 8020 is, in this case, offset by the economic advantage of using EPA Method 8020. <br /> Groundwater samples collected during the regularly scheduled quarterly monitoring events will <br /> continue to be analyzed for oxygenates using EPA Method 8260. <br /> If you have any questions about this directive,please feel free to call Dot Lofstrom at (209)468- <br /> 3436. <br /> Donna Heran,REHS, Director <br /> Environmental Health Services <br /> Dot Lofstrom,R.G. <br /> LOP/Site"Mitigation Unit <br /> cc: Marty Hartzell,CVRWQCB <br /> Glenn Matteucci, Environmental Resolutions,Inc. <br /> " t A Division of San Joaquin County Health Care Services <br /> l <br /> a <br />