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DAMES & MOORE A KOF SSIO ACLIMITEDePA Ti� HIP Pacific Gas&ElecTnc Co. 31 G Page 2, .:'ViRONMENT L HES!TH PERMIT/SERVICES- The proposal was accepted by PG&E and the San Joaquin County Environmental Health Department,and work proceeded with the Phase I portion of work on November 4, 1991.The following report summarizes the details of our findings. E PRO CT HISTORY t ; The project site is currently developed as the PG&E Stockton Service Centerfacility.Please refer to the Site j - R Vicinity,Map included as Figure lat the end of the text.A portion-of,the,subject property is developed with an 80 foot wide by 140 foot long garage structure. At the southern 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 removed storage tanks for chemical,analyses in accordance with the guidelines of the San Joaquin County i - Environmental Health Department. Soil samples were obtained at the depths,frequency and locations speed by the i Health Department. Additionally,excavated soils from.the tank removal operations were stockpiled at the site,and. were also sampled and chemically analyzed l The results of chemical analyses.conducted on soil samples obtained from the.site reported the presence of:petroleum ( hydrocarbons as referenced to gasoline.Soil samples from native soils beneath the,underground tanks reported total } petroleum hydrocarbons(TPH) as gasoline ranging from- non-detected to 16 parts per,million(ppm)concentrations, with benzene,toluene,ethylbenzene and xylenes reported in the same samples at concentrations of less than 0.3 ppm. TPH concentrations reported in samples obtained from the stockpiled soils ranged from non-detected to 400- ppm. i PG&E Stockton Service Center 00160-290-042