ARCHIVED REPORTS LIMITED SOIL ASSESSMENT AND TEST PIT EXPLORATION

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' k4 KLEINFELDER 3 BACKGROUND 3.1. INTERVIEW INFORMATION According to Mr. Bob Hunefeld, owner of the site, the Stockton 99 Speedway was built by his father William in 1947. Prior to that time he believes eves the land on was ss des ofuthe Mr. Hunefeld stated that at one time bleachers we speedway to the southeast and northwest.Hunefeld tatty the ed the sol I beneathrarea is the curre�taand ted only northwest of the speedway. M former bleacher areas were excavated from an area northwest of the current bleacher area. The excavation was reportedly slightly larger than the amount used for the ' bleacher area, and was "filled — in" by backfill debris including concrete, asphalt and gardening material. Mr. Hunefeld was not aware of any hazardous material that was 1 dumped into this excavation. Mr. Hunefeld also stated one above-ground storage tank (AST) has been located just north of the track area for approximately 2 years. Prior to that time reportedly mobile ASTs were used. The current and past mobile ASTs reportedly contained gasoline to fuel race cars. The current AST was reported with concrete secondary containment. ' Mr. Hunefeld did not recall any overspills or leaks associated with ASTs at the site. Mr. Hunefeld also commented two septic tanks are located onsite, one north of the track and one by a mobile home on the southwest portion of the site by the bathrooms. Mr. Hunefeld also commented that 5 dry wells were located onsite, two in a retention basin located northeast of the track, two at the base of the bleachers northwest of the track and one in the interior of the track. Mr. Hunefeld knew the location of four of the five i dry wells, but was unsure of the location of the dry well located inside the track area. Mr. Hunefeld did not know well construction details, but believed the wells to be 20 to 30 feet deep. Mr. Hunefeld commented that the dry wells in the retention basin accepted runoff via lateral pipelines from the area northeast of the track (dirt parking area). ' 3.2. KL EINFELDER PHASE I REPORT A Phase I Environmental Site Assessment (ESA) was concurrently conducted with this Phase II Assessment in a document titled "Phase I Environmental Site Assessment, 99 Speedway, 4105 N. Wilson Way, Stockton, California", dated September 14, 2005 (File No. 58671 .P01, ST05R1103). The following is a summary of Kleinfelder's ESA findings: ' 1. On properties with a history of agricultural use, many underground pipelines may exist. It was common for said pipelines to contain asbestos (e.g. Transite pipe). Subsurface exploration is not a part of a typical Phase I Environmental Site Assessment scope of work. In the event that any ' 58671.E02/ST05R1127/DH:ly Page 5 of 22 September 15, 2005 ©2005 Kleinfelder, Inc.