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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 III. 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 />I <br />1 <br />PSA04.007 <br />13