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Quik Stop Station No. 076 February 8, 1999 Stockton, California Tank Closure Report • Total Lead: Low concentrations of total lead between 5.7 ppm and 5.9 ppm were detected in the native soils beneath former UST T-2. These concentrations are considered to be within background levels normally found in the native soils in the vicinity of the site. Soil Disposal Approximately 607 tons of soil were transported under Non -Hazardous Waste Manifests to the Forward Landfill facility in Manteca, California for recycling. Copies of the Non - Hazardous Waste Manifests are included in Attachment B. Conclusions Based on the nondetectable concentrations of TPHg and the nondetectable to low concentrations of BTEX and MTBE detected during this investigation, it is our opinion that no additional environmental work related to the former USTs is necessary at this 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 adjacent to former UST locations with respect to gasoline -related hydrocarbons. No soil engineering or 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 Quik Stop Markets Inc. for their use and distribution. Distribution We recommend a copy of this report be forwarded to: Ms. Letitia Briggs San Joaquin County Public Health Services Environmental Health Division 304 E. Weber Avenue, Third Floor Stockton, California 95202 7076-1 Ltcr 3 HORIZON ENVIRONMENTAL INC.