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y <br /> „ - <br /> Results of Initial Investigation and Work Plan December 18. 1990 <br /> ARCO Service Station No. 548,Stockton, California AGS 30004-2 <br /> two borings before ground water was encountered. Boring B-2 was terminated 31 feet <br /> below grade, and borings B-4 and B-5 were terminated 21 feet below grade. The borings <br /> were backfilled to the ground surface with a neat cement slurry. Cuttings generated during <br /> drilling were placed on and covered by plastic, and left at the site. Four soil samples were <br /> collected from the drill cuttings and composited into one sample for laboratory analyses. <br /> ® the samples were submitted to the GSX Lokern <br /> In addition, and at th:�request of ARCO, <br /> Facility in Buttonwillow, California, for analysis to establish a profile for soil disposal at a <br /> later date. <br /> of the disposal options of the stockpiled soil.: At <br /> Applied GeoSysiems advised ARCO. <br /> ARCO's request,Aronson Excavating and Hauling of Elk Grove,California,hauled the drill <br /> cuttings to Sacramento City Landfill in Sacramento,.California, on November 21, 1990. <br /> > <br /> Laborato Anal .es d Results <br /> ® Soil samples were collected at approximately 5-foot intervals from each boring and <br /> submitted to the laboratory. Soil samples were analyzed for total petroleum hydrocarbons <br /> as gasoline(TPHg)using Environmental Protection Agency(EPA)preparation Method 5030 <br /> f; and modified EPA Method 8015 and benzene, toluene, ethylbenzene, and total xylene <br /> i5u:niers (BTEX) using EPA preparation Method 5430 and EPA Method 8020. A selected <br /> soil sample collected from boring B-1 was also analyzed far organic lead. The composite <br /> soil sample was analyzed for TPHg. BTEX, and diesel. <br /> The laboratory analyses were performed by Applied Analytical Environmental Laboratories <br /> - -- -- 1211)- - - <br /> in Fremont, California (Hazardous Waste Testing Laboratory Certificate No: `an <br /> 6 <br /> A,vWl f 080systems <br />