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FILE COPY <br /> PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY ? �. <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 4`�-Fi <br /> 209/468-3420 <br /> MIKE KARVELOT AUG 2 4 2000 <br /> QUIK STOP MARKETS, INC. <br /> 4567 ENTERPRISE ST <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 reviewed the "Additional On-Site and Off-site Soil and Groundwater Investigation" <br /> report dated July 2000, that was submitted by Compliance & Closure, Inc. on behalf of <br /> the above referenced site and has the following comments. The report documents the <br /> installation of three cone penetrometer testing (CPT) soil borings on June 21-23, 2000, <br /> and a routine groundwater monitoring event which took place on July 5, 2000. <br /> The CPT borings were proposed in a CCI work plan dated March 27, 2000 and <br /> approved by PHS/EHD on April 10, 2000. The proposed scope of work was to include <br /> the advancement of three CPT borings to a minimum depth of 125-feet below surface <br /> grade (bsg) to investigate the vertical and lateral extent of the documented <br /> contamination at this site, and to gather lithological data that would provide guidance for <br /> the location of additional monitoring wells. Discrete groundwater samples were to be <br /> collected from each permeable zone encountered and analyzed for chemical <br /> constituents. Discrete soil samples were to be collected from identified aquitards for <br /> both chemical and geophysical analysis. <br /> Limitations of the CPT drill rig and hard soils limited the vertical extent of the borings to <br /> approximately 80-feet bsg in CPT-1, the boring located on-site, and to approximately 62- <br /> feet bsg in CPT-2, the boring located off-site to the southwest. The third boring, CPT-3, <br /> located north of the site was advanced to 35-feet bsg only. No soil samples were <br /> collected from any of the borings. One water sample was collected from CPT-1, at 38- <br /> feet bsg, and one from CPT-3, at 16-feet bsg. Two water samples were collected from <br /> CPT-2, one each from approximately 20-feet and 40-feet bsg. <br /> Laboratory reports for the analysis of the water samples collected from the CPT borings <br /> were not submitted to PHS/EHD with this report. Tabulated results indicate the <br /> presence of methyl tertiary butyl ether (MtBE) in CPT-1 only, the boring located on site, <br /> indicating that the vertical extent of the groundwater plume has not been defined in this <br /> area. The water sample from boring CPT-3 was positive for total petroleum <br /> hydrocarbons as gas (TPHg). Results of the analyses of the water samples collected at <br /> the routine quarterly monitoring event were positive for MtBE in all three on-site shallow <br /> groundwater monitoring wells. <br /> A Division of San Joaquin County Health Care Services <br />