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Project No. 014-13157 Page No. 4 unknown if any additional investigation of the Stockton 99 Speedway property has been preformed. However, based on available information, including maps contained in the SGI workplan which indicate that the fill material extends to the property boundary between the Stockton 99 Speedway and the northwestern portion of the subject site, coupled with the detection of lead at 440 mg/kg in a soil sample collected 100 feet from the subject site (the sampling location closest to the subject site) and the relatively widespread detection of lead within the fill material located at the speedway, the condition of surficial soil in the northwestern portion of the subject site relative to a potential impact from metals and organochlorine pesticides is unknown. During Krazan's February 20, 2013 site reconnaissance, stormwater drains were observed at several locations on the subject site, including a line of drains located along the southwestern subject site boundary, a line of drains located between the 3975 and 4001 N. Wilson Way buildings, drains located in the eastern portion of the General Trailer facility, and drains located near the northeastern subject site boundary. Neither, Mr. Scott nor any of the subject site occupants knew how the storm drains were configured or where the drains emptied. Additionally, a steel plate covering an apparent subsurface feature was observed in the southern corner of the subject site (southeastern portion of the General Trailer facility). This apparent subsurface feature is generally in line with the stormwater drains located in this portion of the subject site, and thus may be a dry well or sump associated with the stormwater drain system. The cover to this apparent sump could not be removed at the time of the site reconnaissance and the feature below the steel plate could not be inspected. No odors, surface staining, or obvious evidence of the disposal of hazardous materials/waste was observed in association with the on-site stormwater drains. However, based on the current and historical occupants of the subject site, the hazardous materials commonly utilized in conjunction with these businesses, the presence of two fuel ASTs resting on the ground surface in the western corner of the subject site suggesting that fuel was historically stored/dispensed on site, and the occupation of the subject site by businesses storing hazardous materials since at least 1980, the potential exists for environmentally persistent hazardous materials to have entered the on-site storm drains. Consequently, the condition of the subsurface of the subject site in the vicinity of any on-site stormwater disposal feature, presumed to be an on-site dry well(s), is unknown. Site Location The subject site is located to the west of North Wilson Way and approximately 2,140 feet to the southwest of East McAllen Road within an unincorporated area of San Joaquin County, California (Figure 1). The subject site consists of two parcels collectively measuring approximately 8.8 acres with the associated San Joaquin County APNs of 132-020-08 and -10 (Figure 2). According to the United State Geological Survey, 7.5 minute Stockton West, California topographic quadrangle map, photorevised 1981, the subject site is located in the northern half of Section 25, Township 02 North, Range 06 East, Mount Diablo Baseline and Meridian. The subject site is currently developed with three commercial/light industrial buildings, a former drive-in theater building, a portable office building, and a cellular communications tower. The existing subject site buildings were reportedly constructed between the 1950s and 1991 and are associated with subject site addresses of 3931, 3975, and 4001 North Wilson Way. The remainder of the subject site is developed with unpaved parking areas, paved parking areas, driveways, and landscaped areas. Geologic and Hydrologic Setting The subject site is located within the southern portion of the Sacramento Valley, a broad structural trough bound to the north by the Cascade and Klamath Ranges, bound to the east by the Sierra Nevada Range, and bound to the west by the Coast Ranges of California. The Sacramento Valley, which comprises the northern portion of the Great Valley of California, has been filled with tens to thousands of feet of KRAZAN & ASSOCIATES, INC. With Offices Serving the Western United States 014-13157-Wi1son Property Workplan FINAL