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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY 2: <br /> ENVIRONMENTAL HEALTH DIVISION f <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> KHALDOON OTHMAN <br /> K&S GAS & GROCERY <br /> 701 E CHARTER WAY `�L. _ FILE <br /> STOCKTON CA 95206 JUL <br /> Re: K&S Gas & Grocery Site Code: 2512 <br /> 701 E. Charter Way <br /> Stockton, CA 95206 <br /> San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) <br /> has reviewed the ?Monitoring Well (MW) Installation Report dated June 2, 1999 prepared <br /> by Advanced GeoEnvironmental, Inc. Soil and groundwater samples collected during <br /> MW construction evidence contamination. Further investigative work is necessary to <br /> determine the lateral and vertical extent of contamination at the above referenced site. <br /> Conduct a survey of domestic, municipal, agricultural, industrial and any other wells <br /> within a 2,000 foot radius of this site. Contact the Department of Water Resources, <br /> municipal water suppliers and nearby industries for well information. In addition, <br /> perform a physical search of the area to identify any wells. Show the locations of all <br /> wells on a map with appropriate scale showing the site and clearly marked 2000 foot <br /> radius. Submit any known construction details of the wells (if available) and evaluate <br /> the influence of well pumping with respect to the migration of the contamination from <br /> this site. <br /> MW 1 was installed with the top of the well screen at 35 feet below surface grade (bsg). <br /> Groundwater level measured on December 2, 1998 was 31.90 feet bsg. The top of the <br /> well screen is beneath the groundwater surface and data obtained from this well may not <br /> be representative of actual groundwater conditions. <br /> PHS/EHD recommends constructing a deep boring near the location of MW 1 using the <br /> Cone Penetrometry Test (CPT) method to determine the vertical extent of contamination, <br /> obtain relevant lithological data and to evaluate contaminant migration potential at this <br /> site. Vertical investigation should continue below 55 feet bsg until PID and field <br /> observations indicate two consecutive five-foot intervals of non-detectable soil readings. <br /> PHS/EHD recommends the CPT method for determining the lateral extent of <br /> contamination at the site as well. Additional VlWs will need to be installed to define the <br /> lateral and vertical extent of the soil and groundwater contamination at this site. <br /> A Division of San Joaquin Count- Health Care Services <br />