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�1 <br /> 7.0 SUMMARY OF RESULTS <br /> 7.1 POTENTIAL SOURCES OF CONTAMINATION <br /> Based on this Phase I (PSA) in appears that the potential for subsurface contamination exists <br /> in Audit area 1II. Potential contamination sources include: existing coal and petroleum coke stockpiles, <br /> former copper concentrate stockpiles, the drum storage area, and the fueling area (above ground diesel <br /> tanks). The following section summarizes our findings. <br /> Geology/Hydrology <br /> Soils at the subject site typically consist of loose sandy material to approximately 5 feet bgs <br /> underlain by stiff clayey material. First groundwater occurs at a depth of approximately 6 feet. <br /> Agency Review <br /> Six facilities were found on agency lists within a 1/2-mile radius. Specific information <br /> regarding the extent of contamination at the facilities was not well documented based on our file search, <br /> except for the considerable subsurface contamination of the Port of Stockton fuel terminal. <br /> Site Reconnaissance <br /> Our reconnaissance of Audit area III revealed that the site is developed as a bulk materials <br /> distribution facility. Coal and petroleum coke stockpiles were observed during our visit of the facility. <br /> Evidence of a former copper concentrate stockpile was also observed. The facility includes areas for <br /> drum storage and fueling. The primary material stored in drums appears to be hydraulic oil. Diesel is <br /> the primary fuel stored on site. <br /> PSA04.007 13 <br />