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CONTACT PERSON: Mr. George Ross A & K Railroad Materials, Inc. Post Office Box 30076 -�' Salt Lake City, UT 84130 2.2 Map Showing Site Location Relative to Nearby Landmarks: The site location is shown on Figure 1. 2.3 Layout of All Underground Tank and Piping Systems Properly Labeled for Content: i The area of the former tanks, lines, and pumps are shown on Figure 2. 2.4 Laboratory Results for Initial Soil Sampling: Analytical results for soil samples collected on May 22, 1989 are summarized in Table 1 and the laboratory data sheets are presented in Appendix I. i 2.5 Estimates of Liquid Quantity and Composition Leaked: The lack of detection of significant hydrocarbon contamination in soils beneath the tanks suggest 1 that contaminants in the excavated material were derived from overspillage. No holes were 1 j noted in either tank or in the associated piping during removal. The constituents detected in the soil samples collected from the excavated materials are typically derived fromgasoline. No soil contamination was detected from the samples which were collected from the soil borings beneath 1 the former tank pit. 2.6 Topography, Geology, Hydrology: (. The site is situated on level terrain comprised of Quaternary Alluvial sediments. Near-surface i sediments consist of intercalated sands, silts, clays, and gravels. � L • As is typical of alluvial environments, high permeability zones representing former stream channels may occur as sinuous or lenticular features. Natural groundwater gradients often i + roughly parallel surface drainage trends. Thus, the regional groundwater gradient is to the west toward the bay. A significant pumping depression on the east side of Stockton, however, has strongly influenced local gradients and has in many cases reversed the natural flow direction. The water table at the site lies approximately 90 feet below grade and flows to the northeast � PP Y R-010792.TJL 2 i