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David Wang, P.E. <br /> Page 2 <br /> 0 Contamination resulted from past storage, handling, and <br /> use of these solvents. <br /> o TCE and PCE are moving off-site via groundwater <br /> transport. The direction of movement is to the <br /> northeast4 Monitoring wells have detected low levels of <br /> contamination as far as 2000 feet beyond the Depots' <br /> boundary. <br /> ri <br /> o The hydrogeology and extent of contamination have been <br /> sufficiently defined for RI/FS purposes. <br /> o Soil contamination does not present a significant health <br /> threat. However, remediation of soil contamination at <br /> specific sites would expedite groundwater cleanup. <br /> The draft report concludes that there are 3 major areas (1, 2 , <br /> and 3) of contamination and 3 areas (4 , 5, and 6) with less <br /> significant contamination. <br /> AREA 1: <br /> Area 1 is located near the northeast corner of DDTC. It is <br /> considered a major source area for both soil and groundwater <br /> contamination. Facilities contributing to the contamination <br /> in Area 1 are a railroad storage and maintenance building, a <br /> vitrified clay pipe line that handles industrial waste, and a <br /> recoup facility. <br /> AREA 2 : <br /> Area 2 is located 1000 feet downgradient of Area 1, at the <br /> Depots' northern boundary. Area 2 served as an open storage <br /> area. WCC theorizes that the majority of contamination <br /> detected in Area 2 had its' origin at a different location, <br /> primarily Area 1. Groundwater monitoring wells have detected <br /> TCE and PCE moving off-site from Area 2 . <br /> AREA 3 : <br /> Area 3 is located along the Depots' northeastern boundary, <br /> 1400 feet cross gradient of Area 2 . It is suspected that <br /> shallow groundwater contamination is the result of leakage <br /> from storage and handling. Groundwater contamination moving <br /> off-site has also been detected in Area 3 . <br /> AREA 4 : <br /> Area 4 is located between a warehouse (building 18) and a <br /> flammable storage facility (building 28) . WCC considers the <br />