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'E e` Mobil Oil Corporation KEI-J86-084 Page 3 M August 27 , 1986 CONCLUSIONS �s The results of the samples indicate that very low to moderate levels of gasoline constituents are locally present in the soil and shallow groundwater at the site . According to the State Department of Water Resources , the shallow groundwater in the City of Tracy i' of inferior quality and is not used for domestic purposes . The city of Tracy rely on their water source from deep aquifer which extends to more than 100 feet . The presence ofll.gasoline constituents detected in the shallow groundwater could be in our opinion, either due to accidental product release : during tank and product lines removal or gas spillage during!l" tank filling or leakage of line or a combination thereof . Considerable amount of groundwater was removed by vacuum truck from the tank pit area and subsequent inspection of the site on August ,24 , 1986 revealed no sheen or petroleum product on the water surface. To date , data collected from the investigation and field observation indicate no evidence of major gasoline leak. Although shallow groundwater appears to be impacted , we do not beleive that gasoline contamination of' the deeper aquifer has occured . RECOMMENDATIONS' To define the lateral and vertical extent of the dissolved. contamination , as required by !the Regulatory Agency , it is necessary to install four (4) -monitoring wells at the site. Our proposal for further investigations is attached for your review and approval . 'k Please submit this report along with the attached proposal to the Regional Water Quality Control Board .and San Joaquin County Health Departmeknt . KEI will commence work with further investigation ulpon your authorization . Sincerely , Kaprealian Engineering, Inc . Mardo Kaprealiarh i ,t Attachment : Location Map cc : C. Calloway . 1 �I