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PUBLIC t'H- EALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> r' Z <br /> ENVIRONMENTAL HEALTH DMSION < <br /> Karen Furst, M.D.,M.P.H., Health Officer <br /> o,. <br /> 304 East Weber Avenue, Third Floor• Stockton, CA 9��� � COPY Q� � <br /> 209/468-3420 <br /> MIKE KARVELOT <br /> QUIK STOP MARKETS INC APR 16 1999 <br /> 4567 ENTERPRISE ST <br /> FREMONT CA 94538 <br /> Re: Quik Stop Markets Inc. Site Code: 1130 <br /> 3555 Hammer Ln. <br /> Stockton, CA <br /> San Joaquin County Public Health Services Environmental Health Division(PHS/EHD)has reviewed the <br /> Additional Groundwater Investigation Report dated April 8,1999 prepared by ATC Associates for the <br /> above referenced site. The analytical results evidence Methyl tertiary Bury] Ether, Benzene,Tert Butanol, <br /> Toluene and Total Petroleum Hydrocarbons as gasoline contaminants in groundwater. The soil and <br /> groundwater samples were collected from borings constructed south of the above referenced site in an <br /> attempt to define the contaminant plume edge in that direction. A well survey was to have been conducted <br /> during this phase of investigation work(see Additional Groundwater Investigation Work Plan dated <br /> November 17, 1998,Task 3)as per PHS/EHD letter dated April 27, 1998. PHS/EHD has not received the <br /> well survey and receptor report. <br /> Conduct a complete well survey of domestic, municipal,agricultural, industrial and any other wells within <br /> a 2,000 foot radius of this site. Contact the Department of Water Resources,municipal water suppliers and <br /> nearby industries for well information. Perform a physical search of the area to identify any wells. Show ! t <br /> the locations of all wells,submit any known construction details of the wells. Identify all sources of <br /> information in the well survey report and clearly depict each well location as they relate to the above <br /> referenced site. Discuss conclusions regarding public and environmental health risks as they relate to the <br /> pumping influence of these identified wells and the migration and potential impact of the contaminant <br /> plume. <br /> A Work Plan to determine the lateral extent of the contaminant plume at this site should be submitted to <br /> PHS/EHD by June 20, 1999. PHS/EHD recommends the placement of a Monitoring Well(MW)near <br /> boring #ATC-2 to monitor and evaluate off site migration of contaminant concentrations in the <br /> groundwater. Additional M Ws may be necessary to complete the lateral extent of the contaminant plume at <br /> this site. <br /> When the contaminant plume has been defined,feasibility tests should be conducted in order to compare at <br /> least two different remediation alternatives. Quarterly Monitoring of all MWs should continue until <br /> otherwise directed by this office. Contact Carol Oz,Senior REHS at(209)468-3440 if you have further <br /> questions regarding this letter. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Carol Oz, Senior REHS Margaret REHS <br /> Site Mitigation Unit IV Supervisor <br /> cc: Mark List-CVRWQCB <br /> Drew Van Allen-ATC <br /> A Division of San Joaquin County Hcalth Care Scrvic <br />