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App/!ed GeoSystems 4191•E Power Inn Road, Sacramemo,CA 95826 (916)452-2901 <br /> ° FREMONT •IRVINE ® HOUSTON ° BOSTON °SACRAMENTO °CULVER CITY °SAN JOSE <br /> i <br /> ® RECEIVED <br /> J 1!E 20 f940 July 16, 1990 <br /> ENVIRONMENTAL HEALTH 30041-1 <br /> Mr. Kyle Christie PERMIT/SERVICES <br /> ARCO Products Company <br /> P.O. Box 5811 <br /> San Mateo, California 94402 <br /> Subject: Executive Summary of Report of a Limited Environmental Investigation at <br /> ARCO Service Station No. 6100, 25775 South Patterson Pass, Tracy, <br /> California. <br /> Mr. Chrisiie: <br /> At the request of ARCO Products Company (ARCO),Applied GeoSystems conducted an <br /> environmental investigation limited to evaluating soil for evidence of gasoline hydrocarbons <br /> at the subject site. The purpose of this investigation was to evaluate soil for possible <br /> gasoline hydrocarbons before the removal of underground gasoline-storage tanks. <br /> Applied GeoSystems was at the site an lune 6 through 8, 1990, to observe Wayne Drilling <br /> of Lincoln, California, drill five soil borings. Three soil borings were drilled near the <br /> underground storage tanks (borings 13-1 through B-3) and two soil borings were drilled in <br /> the area of the new tank cavity (B-4 and B-5). <br /> fin+ A 6-inch wet soil sample was collected from approximately 19-1/2 to 20 feet below grade <br /> in borings 13-1 and B-3. A wet sample was logged between 14-1/2 and 15 feet below grade <br /> in boring B-4. The saturated zone did not produce an adequate amount of water to <br /> accumulate in the boring. The 6-inch sample below these wet samples was logged as damp. <br /> A saturated zone was not detected in borings B-2 and B-5. <br /> In the area of the existing tank cavity, hydrocarbons were detected to 4S feet in boring B-1, <br /> 20 feet in boring B-2, and 10 feet in boring B-3. Laboratory results of samples collected <br /> from these intervals indicate total petroleum hydrocarbons as gasoline(TPHg) from 49 to <br /> 1,900 parts per million(ppm). Concentrations of benzene,toluene,ethylbenzene,and total . <br /> xylene isomers (BTEX) ranged from below detection limits to 150 ppm. In the area of the <br /> proposed tank cavity,hydrocarbons were also detected in the samples collected from 15 and <br /> 20 feet below grade from borings B-4 and B-5 (42 to 810 ppm of TPHg). <br /> r <br />