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• PRIVILMED & CONFIDENTIAL <br /> /► <br /> Los Angeles • Washington D.C. <br /> B U I L D I N G 528 STATE STREET <br /> ANALYTICS GLENDALE,CALIFORNIA 91203 <br /> Building/Environmental Evaluations (818)500-1898(818)246-8195 FAX <br /> October 9, 1998 <br /> Mr. Arthur Barbour File No.:198075 <br /> Vice President <br /> 1 Corporate Properties Group <br /> Wells Fargo Bank <br /> 633 Folsom Street, 6th Floor <br /> 1 San Francisco, California 94107-3600 <br /> Mr. Ron Rowe <br /> Senior REHS <br /> Site Mitigation Unit <br /> San Joaquin County Public Health Services, <br /> Environmental Health Division (SJCEHD) <br />' 304 East Weber Avenue, 3rd Floor <br /> Stockton, California 95202 <br /> REFERENCE: Wells Fargo Bank Property <br /> 49 South Wilson Way, Stockton, California <br /> SJCEHD Site No. 506077 <br /> SUBJECT: Report <br /> Additional Phase 11 Subsurface Investigation and Quarterly <br /> Groundwater Monitoring <br /> rDear Mr. Barbour and Mr. Rowe: <br /> Building Analytics is pleased to submit this report to Wells Fargo Bank, Corporate <br /> Properties Group, and the San Joaquin County Public Health Services, Environmental <br /> Health Division (SJCEHD). <br /> Based on the data presented in this report, the following summary of findings is presented: <br /> • The groundwater flow direction was measured to be to the northeast with a <br /> hydraulic gradient of 0.0055; <br /> • Total Petroleum Hydrocarbons as gasoline (TPH-g) concentrations between 1.3 <br /> and 590 milligrams per kilogram (mg/kg) were reported in the soil samples <br /> collected from Boring B5 at depths between 35 and 61 feet below ground surface <br /> (bgs). The deepest sample, B5-78, collected at 78 feet bgs, was reported to contain <br /> 2.8 mg/kg of TPH-g; <br /> • Only sample B5-50, collected at 50 feet bgs, was reported to contain benzene, at <br /> 0.006 mg/kg. <br />