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REPORT ON OVEREXCAVATION PROCEDURES <br /> Rotor Blades <br /> 1514 East Scotts Avenue <br /> Stockton, California <br /> June 1994 <br /> 1.0 INTRODUCTION <br /> In accordance with a request from Mr. Phil Johnston of Rotor Blades, Geological Audit <br /> Services, Inc. (GeoAudit) has prepared this report for excavation procedures performed at <br /> 1514 East Scotts Avenue in Stockton, California (the site). Approximately 100 cubic yards <br /> of soil were excavated from the area of the former underground storage tanks (UST's). The <br /> location of the site is illustrated in Figure 1. A plan of the site is illustrated in Figure 2. <br /> 2.0 BACKGROUND <br /> 2.1 Site Location <br /> The site is located in a flat commercial/industrial area of Stockton, California, on the south <br /> side of Scotts Avenue, east of Wilson Way (Figure 1). A large warehouse and an office <br /> building are currently located on-site. <br /> 2.2 UST Removal <br /> On May 14, 1993, two 1,000-gallon UST's were removed from the site by Blaine Tech <br /> Services, Inc. (BTS) under the direction of the San Joaquin County Public Health Services - <br /> Environmental Health Division (PHS/EHD). Four soil samples were collected from beneath <br /> the tanks at the time of removal and analyzed for total petroleum hydrocarbons (TPH as <br /> gasoline and diesel), volatile aromatics (BTE&X) and total lead. <br /> Petroleum hydrocarbons were detected in one soil sample from beneath the tanks (TPH as <br /> gasoline: 2,000 ppm; TPH as diesel: 770 ppm). An additional sample was collected from <br /> stockpiled soil on-site. However,no petroleum hydrocarbons were detected in the stockpiled <br /> soil. <br /> 2.3 Groundwater Depth and Gradient <br /> According to the San Joaquin County Flood Control Map(Fall, 1993), depth to groundwater <br /> in the area is approximately 70 feet. The regional groundwater gradient is easterly. <br /> 0.b Ad's S—i-4 I— 1 <br />