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Pacific Gas&.Electric.Co' <br /> Page 3 <br /> The proposed scope of services will include the following tasks: <br /> U <br /> o Initially obtain soil samples from the over-excavated tank pit for chemical analyses; <br /> In the event sampled soils analyses report persistent levels of detectable'petroleum.hydrocarbons: <br /> o Research and review of pertinent,readily available-geologic and hydrologic literature,review previous site <br /> studies;review of local area water wells and local businesses <br /> o °Obtaining necessary permits prior to the commencement of the fiel&p' ortion of the investigation <br /> oPossibly drill three exploratory soil born -to sample subsoilsfor. 'c evaluation and chemical <br /> Y xP ry _ &S P- y � . - <br /> fanalyses <br /> I <br /> o Chemical analysis of soil samples to assess the presence and concentration of petroleum constituents <br /> o Analyze data obtained from the field and laboratory testing to evaluate appropriate and applicable remedial <br /> alternatives <br /> o'Preparing a report to present our findings,conclusions and recommendations. <br /> i 4.0 TECHNICAL APPROACH <br /> Based upon review of previous soil sampling and chemical'analyses at the subjectproperty and published data <br /> regarding local geologic and hydrologic conditions,Dames&Moore developed'ihe following'technical approach for the <br /> proposed investigation. <br /> � { Our preliminary data regarding depth to groundwater in the vicinity of the'subject pro-pertysuggests groundwater <br /> currently occurs at an approximate depth of 60 feet below'the surface grade. Since the results of chemical analyses <br /> ? from samples obtained in native soils beneath.the tanks were reported at isignificantly lower,concentrations than the <br /> stockpiled overburden soils sampled,we surmise that the concentrations of hydrocarbons reported suggest overfill . <br /> .�� spillage,rather than.a tank-leak situation. <br /> rj Proposal <br /> L: Stockton Service Center <br /> DAMES 6t MOORE <br />