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•J <br /> SITE SUMMARY REPORT <br /> CALDRON'S GENERAL STORE <br /> 12570 West Byron Road <br /> J Tracy, California <br /> 1.0 INTRODUCTION <br /> In accordance with a request from Mr. Frank Caldron, owner of Caldron's General Store, <br /> Geological Audit Services, Inc. (GeoAudit) has prepared this report for activities conducted <br /> at 12750 West Byron Road in Tracy, California (the Site). <br /> 2.0 BACKGROUND <br /> 2.1 Land Use <br /> The site is located in the relatively flat rural area of Tracy, in southwestern San Joaquin <br /> County (Figure 1). A small general store, a barn and a railroad car, used for storage, are <br /> currently located on the property. <br /> 2.2 Underground Storage Tank Removal <br /> It is our understanding that two (2) 2,000-gallon underground storage tanks (USTs) were <br /> removed from the site on November 11, 1991, by Thorpe Oil of Lodi, California. The tanks <br /> were used to dispense premium unleaded gasoline (tank #1) and regular unleaded gasoline <br /> (tank #2). According to the San Joaquin County Public Health Services - Environmental <br /> Health Division (PHS/EHD), tank #2 was "corroded and contained 1/2-inch holes at the <br /> bottom, south end of the tank" (PHS/EHD correspondence dated June 22, 1992). The <br /> PHS/EHD also indicated that soil discoloration and a petroleum odor were noted at the <br /> time of tank removal. <br /> Soil samples collected beneath the USTs indicate that an unauthorized release of <br /> hydrocarbons has occurred.Total petroleum hydrocarbons(TPH as gasoline)were detected <br /> at 2.8 mg/kg (parts per million, ppm) in one sample. Benzene, toluene, ethylbenzene, and <br /> xylenes were also detected in this sample. A site plan with soil sample locations is shown on <br /> Figure 2. " <br /> Groundwater was encountered in the tank excavation and a grab sample indicated that <br /> groundwater has been impacted. Toluene and xylenes were detected in the water sample at <br /> 0.5 ppb and 1.2 ppb, respectively. The analytical results are summarized on Table 1. <br /> C"6s-1 A.&s.—.,1- 1 <br />