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S 1� Sunland Gasoline March 14, 2000 ' 2085 Fremont Street, Stockton, California Page 2 • Report of Findings, Site Characterization excavation activities. Figure 3 depicts the locations of the samples collected during the tank removal event on December 15, 1998 and the December 31, 1998 sampling event. rOn December 31, 1998 a total of eight (8) soil samples were collected from beneath the former product piping and dispenser locations by a representative of Precision Enviro- Tech Analytical Laboratory (Figure 3). The soil samples submitted for analysis from the vicinity beneath the former UST's, product piping, and dispenser locations and from the stockpiled soil were analyzed by EPA method 8015M/5030 for gasoline petroleum hydrocarbons, EPA method 8020 for BTEX, EPA method 8260 for fuel oxygenates (MTBE, TAME, RIPE, ETBE, and TBA), ' and EPA method 6010 for total lead. The results from these samples indicated that petroleum hydrocarbon contamination is present in the vicinity beneath the former UST's, product piping, and dispenser locations. Petroleum hydrocarbon contamination was also detected in the stockpiled soil. BTEX and fuel oxygenate contamination is present in the stockpiled soil and in the vicinity beneath ' the former UST's and dispenser locations. Lead was found in the soil samples collected from the vicinity beneath the former UST's and product piping locations,. but at insignificant levels. 1 ' 3.0 Scope of Work This scope of work was completed to characterize the nature and extent of the ' contamination associated with the unauthorized release that occurred as a result of fueling operations located on the subject property. ' On February 22, 2000, WW, Inc., in conjunction with Frontier Drilling completed two (2) soil borings at the subject property, one (1) of which was completed to a depth of thirty feet (30'), and one was completed to the a depth of eighty feet (80') as directed by Carol ' Oz of San Joaquin County Public Health Services, Environmental Health Division (SJC PHS/EHD) during her site visit at the time of drilling operations. The County's intent was to drill to the depth at which the field PID registered none detectable levels of petroleum hydrocarbons. The shallow boring was completed in the vicinity of Dispenser 3, and the deep boring was located in the vicinity of soil sample TK2-S East, the area of highest known contamination (Figure 4) found from the previous investigation. ' were collected at 5-foot intervals. Each sample was screened with a field Soil samples e PID for the presence of hydrocarbon contaminates. A single groundwater sample was ' collected at a depth of approximately forty-seven feet (47') from the deep boring. Laboratory samples were collected and sent to GeoAnalytical Laboratories, Inc., in Modesto, California, for analysis.