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_+IXAIt�961£MeYl!:W.CIE'!uf:T <br /> ����_�.__.�-.��..��•�..�—rte <br /> December 10, 1990 <br /> Work Plan to Excavate Gasoline Tank Cavity AGS 30055-2W <br /> ARCO Service Station No. 6020, Manteca, California <br /> d as the new tank cavity. Boring B-1 was drilled near the Cilport ends <br /> to the area propose <br /> re drilled around tanks T-2 and T-3. <br /> of tanks T-2 and T-3,and borings B-2.B-3,and B-4 we <br /> The locations of the borings in relation to site features are shown on Plate P <br /> ® Our field procedures and results are described in Applied GeoSystems Report No.30055-1, <br /> dated October 3, 1990. Descriptions of materials encountered are presented in the Logs of <br /> Boring in Appendix A. <br /> The materials consisted predominately of fine- to coarse-grain <br /> ® ined grave <br /> The borings were <br /> sand and silt and a trace amount of fine- to coarse-graround water. which was <br /> terminated approximately 1 foot below the first encounter of g <br /> approximately 20 feet below grade in parings B-2 though B-7 and 25 feet in boring B-1. <br /> laboratory analyses of soil samples collected from the borings are summarized <br /> Results of la ranged <br /> ® petroleum <br /> hydrocarbons as gasoline (TPHg) g <br /> in Table 1. Concentrations of total P m and concentrations of benzene. <br /> from belr'v detection limits to 3.73 parts per million(ppm),were below 10 ppm. in the soil <br /> l <br /> s <br /> 0 toluene, ethylbenzene, and total xyler�e isomers (BTE an <br /> ses and Chain of Custody <br /> samples submitted for analyses. Ccaies of laboratory Y <br /> Records are in Appendix B. <br /> i <br /> 3 <br /> Awplied GeoSystems <br />