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Pacific Gas&Electric Co. ' Page 1 - , it - 10 INTRODUCTION Pursuant to your request,Dames&,Moore has-prepared a proposal workplan:for a Problem Assessment Report study for r. the Pacific:Gas&Electric(PG&E)Stockton Service Center property.The.problem assessment report study is understood'to have,been requested by PG&E subsequent--to underground storage tan_k removals at the subject property. i Chemical analyses conducted on-soil samples.obtained at the time of the tank�removals reported low levels of U = . petroleum hydrocarbons as referenced to gasoline in native soils within.the excavation,and higher4evels in overburden soil excavated from atop and around`the removed tanks: This workplan addresses two options for evaluating residual hydrocarbons at the tank removal'site. The initial phase involves over-excavation of soils'within the bottom of the tank removal pit and,conducting confirmation sampling and chemical analyses of native soils below In the eventsamplesobtained from the limits of the over-- excavation process report the detectable:levels of hydrocarbons,then drilling and subsoil sampling will proceed as lJ a second phase of work. The following proposal summarizes the details of our workplan.- 2.0 PROJECT HISTORY Detailed information regarding.the.subject property has notbeen made available to our office as of this proposal date.The project site is currentlydeveloped as the PG&E Stockton Service Center"facility.A portion of the a subject property is developed with an 80 feet.wde by 140-feet long garage structure.At the southem end of the garage structure were situated three.underground storage tanks and a dispenser island. On or about October 16,1991,-three underground gasoline storage tanks were excavated and removed from the site. The tanks were described as one 12,000 gallon and two 5,000 gallon capacity.Soil samples were obtained from.beneath the removedstorage tanks for,chemical analyses in accordance with the guidelines of the San Joaquin County Environmental Health Department. Soi.f samples were obtained at the depths,frequency and locations specified by the �j Proposal Stockton Service Center I DAMES &MOORE