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PUBLIC HEALTH SERVICtS �N•.,c <br /> SAN JOAQUIN COUNTY Q �� <br /> ENVIRONMENTAL HEALTH DIVISION - T <br /> Karen Furst, M.D., M.P.H., Health Officer �q• .-A <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 'FOR <br /> 209/468-3420 <br /> MIKE KARVELOT <br /> QUIK STOP MARKETS INC <br /> 4567 ENTERPRISE ST FEB 14 2000 <br /> FREMONT CA 94538-7605 <br /> RE: Quik Stop Market #121 SITE CODE: 1430 <br /> 1196 W. Louise Ave. <br /> Manteca CA 95336 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> has recently reviewed the file for the above referenced site, and the preliminary <br /> analytical data from the most recent groundwater sampling event, and has the following <br /> comments for your consideration and action. <br /> On March 26, 1998 three underground storage tanks (UST) were removed from the site. <br /> Analytical data from soil and water samples that were collected at the time of the tank <br /> removal indicated significant contamination by methyl tertiary butyl ether (MtBE) had <br /> occurred. Since that time, five soil borings and three groundwater-monitoring wells have <br /> been installed. Analytical results from soil and water samples collected during these <br /> mobilizations, and from four quarters of groundwater monitoring events, have shown <br /> sporadic but significant levels of MtBE present in soil and groundwater. The most recent <br /> groundwater monitoring at this site took place on January 20, 2000. At the request of <br /> PHS/EHD, your consultant, Compliance & Closure, Inc. (CCI), faxed a copy of the <br /> laboratory analytical results to PHS/EHD as soon as they were available. All three wells <br /> were positive for MtBE, at levels up to 58,000 parts-per-billion (ppb). However, the <br /> samples were analyzed by EPA Method 8020 without a confirmation analysis by EPA <br /> Method 8260. It is the recommendation of PHS/EHD that this sampling event be <br /> repeated and that the samples are analyzed by a full scan EPA Method 8260. <br /> In recent months MtBE has been receiving much attention from the State Water <br /> Resources Control Board (SWRCB). The SWRCB is currently developing guidelines for <br /> the investigation and cleanup of MtBE and other ether based oxygenates. A section of <br /> the guidelines details regulatory response timing which will be based on contaminant <br /> concentrations and distance to drinking water wells. As you probably know, there is a <br /> City of Manteca municipal well located approximately a quarter mile from this site. <br /> A more aggressive approach to delineating the location and vertical and lateral extent of <br /> the contaminant plume at this site is necessary. The Regional Water Quality Control <br /> Board, Central Valley Region (RWQCB), has requested that sentry work be done <br /> between this site and municipal well #15, located on Agate Street, and that future soil <br /> borings be done by a continuous core methodology. At least one monitoring well should <br /> A Division of San Joaquin County Health Care Services <br />