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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main,Street <br /> Esealon,California 95320-1927 <br /> Telephone: (209)838-9888 <br /> Facsimile: (209)838-9883 <br /> March 19, 2001 <br /> I <br /> I <br /> Ms. Lori Duncan ( 19 � <br /> San Joaquin County Public Health Services <br /> Environmental Health Divisionu' t. <br /> 304 East Weber Avenue, Third Floor ii L <br /> Stockton, CA 95202 <br /> 'Subject: _ North Stockton Auto Service, <br /> 8709 N.Davis Road, Stockton, CA(Site Code 0786) <br /> equest for-vVorkpSan� - - - - <br /> Dear Ms. Duncan: <br /> We are writing on behalf of Mr. Edward Niemann in response to your letter dated March 9, The letter <br /> directed the responsible party to prepare a workplan to install at'least three groundwater monitoring <br /> wells and to conduct a sensitive receptor survey, These directives were based upon.the detection of <br /> certain contaminants in a groundwater grab sample collected from beneath the former tankpit. <br /> We do not feel that the installation of three wells is necessary at this time. The concentrations of the <br /> contaminants in the grab sample were either below MCLS or only slightly above MCLS. In our <br /> abundant experience; contaminant concentrations detected in grab samples are nearly always higher <br /> than concentrations detected in monitoring wells constructed at the same location. If these compounds <br /> are a result of a release from the UST, concentrations should be at their maximum levels beneath the <br /> former source area(given the recent tank removal). A single monitoring well constructed in the former <br /> tankpit should be capable of establishing the maximum concentrations in any plume originating from <br /> the UST. We expect that these will be below MCLs and that further definition of the extent of the <br /> plume may be unnecessary. <br /> Moreover, information on groundwater flow is available from the adjacent Circle K.site where at least <br />` T four morutonng wells e�"x st The wellhead elevation of the onsite well can be-tied to those at the Circle <br /> K site and groundwater elevation data coordinated with information from Circle K. <br /> i <br /> We recommend the installation of a single monitoring well at this time: We also recommend <br /> - assembling information on current and historical business practices at the adjacent Kelly's Carwash, <br /> nsauto/reports/weltrespAr <br /> {i <br />