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t <br /> Pacific Gas.&Electric Co. <br /> Page 2 <br /> Health Department.-Additionally,excavated soils from the tank removal`operations were stockpiled at the,site,and <br /> were also sampled and chemically analyzed., <br /> The resu_lts'of chemical analyses conducted on soil samples obtained from t.he site reported the presence of petroleum <br /> r' hydrocarbons as referenced to gasoline.Soil samples from native`soils beneath the underground tanks reported'total <br /> Li _ <br /> { petroleum hydrocarbons(TPH)asgasoline ranging from non=detected to 2.6 parts per million(ppm)concentrations, <br /> } ! with benzene,toluene,ethylbenzene and xylenes reported in the same samples.at concentrations of less than 0.3 ppm. <br /> TPH concentrations reported in samples`obtained from the stockpiled soils ranged from non-detected to 400 ppm. <br /> 3.0 PURPOSE AND SCOPE.OF WORK <br /> The purpose of the: ro osed investi ationwi1be to evaluate subsurface hydrocarbons in subsoil at the subject, <br /> P ,P P P g ,.Y J <br /> n accordance with the criteria s eked in the Regional Board Staff Recommendations for Initial` <br /> property i-. P � <br /> Evaluation and Investigation of Underground-Tanks,.Appendix A,Tri-Regional Recommendations for a-Problem Assessment' <br /> Report(PAR).The PAR is:a pro=active investigation designed to evaluate the distribution of..petroleum hydrocarbons <br /> in subsoil with an objective of obtaining sufficient data to evaluate.site-gpecific applicability of mitigating and <br /> remedial alternatives. <br /> In order to accomplish the goals established for the PAR,further investigation will be.required at the subject <br /> Ll property to obtain additional data for.analysis.The data obtained from previous soil sampling and chemical analyses <br /> at the subject property will be coupled with data from our propos ed,additional`investigation to evaluate subsurface <br /> conditions with respect to completing the PAR. <br /> The scope of,the proposed investigation will be accomplished by and limited to exploratory soil boring,soil ' <br /> t <br /> sampling,and chemical analysis of soil samples. <br /> Proposal - <br /> Stockton Service Center <br /> DAMES &MOORE <br />