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Geological Audit Services Inc. <br /> mom <br /> MW 4803 W March Lane Suite A•Stockton CA 95207•(209)956 0264• FAX(209)956-0700 <br /> r.- <br /> - 14 August 1991 <br /> AUG 19 1991 GeoAudit CV43C5-1. 3 <br /> Mr. Ed Gotelli - <br /> Mid-Cal Leasing ENVIRONMENTAL,HEALTH <br /> 1856 N. Broadway PERMIT/SERVICES <br /> Stockton, CA 95205 <br /> 8ubj®cta Preliminary Investigation and Evaluation Report <br /> of Hydrocarbon Contamination at Mid-Cal Leasing <br /> 1634 E. Channel at. , Stockton, CA 95295 <br /> Dear Mr. Gotellio <br /> In accordance with a request by Falcon Energy, our company has <br /> supervised the excavation and removal of contaminated soil from the <br /> tank cavity of the former waste oil tank at the referenced address. <br /> " Excavation and sampling took place on 21 and 27 June, 16 July, and <br /> 2 August 1991. The Environmental Health Division (EHD) of Public <br /> Health Services for San Joaquin County requires that the results of <br /> • this investigation be presented in a Preliminary Investigation and <br /> Evaluation Report (PIER) . <br /> BACKGROUM <br /> An underground waste oil tank inside the garage was removed by <br /> rTV Thorpe Oil in kdanuary, 1989L. Approximately 3 .5 cu. yds. of soil <br /> were removed from a cavity measuring approximately 6 ft long x 4 ft - <br /> k wide x 4 ft deep. A soi:lz,.sample=was collected from4 belowithe--tank <br /> ks■ <br /> at approximately 5=6 y aft" be1oW- grade' and analyzed by' C�noriij? <br /> Environmental for total extractable petroleum hydrocarbons and <br /> BTE&X. An unauthorized release of hydrocarbons was detected, with <br /> �n <br /> a concentration of 8500 mg/kg (ppm) TPH: <br /> Geological Audit Services submitted a workplan for reexcavation of <br /> the contaminated soil to San Joaquin County Environmental Health <br /> Division on 2 May 1991. SJEHD approved the workplan on 19 June <br /> 1991. <br /> Depth to ground water is estimated to be approximately 60 feet (San <br /> Joaquin County Flood Control and Water Conservation District, Map <br /> showing lines of equal depth to water wells, Fail, 1989) . <br /> PROCEDURES <br /> Using a backhoe, the tank cavity was reopened and enlarged on 21 <br /> . June (Figure 2 -- Site Plan) . The cavity was deepened to <br /> approximately 16 ft, the maximum attainable by backhoe. A photo- <br /> Env ronrnental Services • Hydrogeoiogy•Geotechmca!Services <br />