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V Former Discovery Chevrolet September 16, 1998 Tracy,California Re rt on Remedial Work v Based on the analytical results of the overexcavation soil samples, only low levels of TPHg (between 5 ppm and 27 ppm), Benzene (between 0.034 ppm and 2.4 ppm), and TEX (between 0.012 ppm and 41 ppm) were left in place in the perimeter soils of the overexcavation cavity. These results are below the Target Cleanup Level of 5 ppm Benzene in soil approved by the SJCPHS-EHD for the site. Based on the results of this investigation and the extent of overexcavation work performed at the site, it is our opinion that other than the short-term groundwater verification monitoring, no further remedial work related to the former USTs, former associated piping, and former dispenser is necessary at this site. By removing the gasoline-impacted soil as a secondary source for hydrocarbons in groundwater, the gasoline hydrocarbons in groundwater should naturally attenuate with time. It is Horizon's recommendation that this site be closed by the SJCPHS-EHD, and no further environmental work required, other than proper destruction of the four remaining groundwater monitoring wells (MW-2 through MW-5) at the site. Limitations The methods and procedures utilized for this work are the generally-accepted standards of the practice of geology and environmental science in California at the time of the investigation. This site investigation was conducted solely for the purpose of evaluating soil conditions with respect to gasoline-related hydrocarbons. No soil engineering or r..� geotechnical references are implied nor should any such references be inferred. The evaluation of geological conditions at the site, for purposes of this investigation, was made utilizing a limited number of observation points. Subsurface conditions may vary some distance away from the available observation points. This report is the property of Horizon Environmental Inc. and the Nokes family for their use and distribution. Distribution We recommend a copy of this report be forwarded to the following agencies: Mr. Jeffrey Wong/Ms. Margaret Lagorio San Joaquin County Public Health Services, *� Environmental Health Division 304 E. Weber Avenue, 3rd. Floor Stockton, California 95202 Mr. Jim Munch State Water Resources Control Board Division of Clean Water Programs UST Cleanup Fund P.Q. Box 944212 Sacramento, California 95244 - 2120 300I-21.ovx 6 HORIZON ENVIRONMENTAL INC.