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i Table 1 Site Conceptual Model March 24, 2006 Site 1257 W Yosemite Station Chevron Station 9-1848 Address Avenue Number- City Manteca , Regulator. Mr Mike Infurna California San Joaquin County Item Evaluation Criteria Comments/Discussion 1 Hydrocarbon Source 1 1 Identify/Describe Release Source and The first generation USTs, the former used-oil Volume(if known) UST, associated product lines and dispenser islands, which were removed in 1991, appear to be the hydrocarbon source No release source volume estimates are available 1 2 Discuss Steps Taken to Stop Release In June and July 1991, GeoStrategies Inc (GSI) observed the removal of one 5,000-gallon UST, • two 10,000-gallon USTs, one 1,000-gallon used- oil UST, product lines, four hydraulic hoists, one 15-gallon fluid tank, a grease trap and an oil/water separator Approximately 990 cubic yards of soil was transported to a Chevron approved disposal facility 2 Site Characterization 21 Current Site Use/Status The site is an active Chevron-branded service station and is likely to remain a service station in the foreseeable future 22 Site Investigations 1991 UST Removal and Replacement In June and July 1991, GeoStrategies Inc (GSI) observed the removal of one 5,000-gallon UST, two 10,000-gallon USTs, one 1,000-gallon used-oil UST, product lines, four hydraulic hoists, one 15- gallon fluid tank, a grease trap and an oil/water separator Soil samples collected in the former UST cavity reported maximum total petroleum hydrocarbons as gasoline (TPHg) and benzene at 450 milligrams per kilogram (mg/kg) and 2 4 mg/kg,respectively Soil samples collected at the bottom of the former used-oil UST cavity reported maximum concentrations of TPHg and benzene at 2 4 mg/kg and 0 0056 mg/kg, • respective y Soil samples collected at the bottom 1