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903806-SS4 CON-49 <br /> 4.3.6.6 Contaminant Area 6. There are two wells in Contaminant Area 6, LM <br /> 35 and LM 36, and one shallow well approximately 200 feet downgradient, LM <br /> 82. The shallower well in the Contaminant Area, LM 35, has consistently <br /> shown 5 to 8 ug/l TCE only from 1986 to 1988. The deeper well , LM 36, has <br /> shown neither TCE nor PCE above detection limits. The downgradient well , <br /> LM 82, showed TCE at 0.6 ug/l and PCE at 1.4 ug/l when installed and <br /> sampled in 1989. The soil gas samples in the area all showed total <br /> halocarbons below 1 ug/l , and the two soil borings both showed neither TCE <br /> nor PCE above detection limits. The airphotos (Figure 3.1-1) show drums <br /> stored in an area generally upgradient from Contaminant Area 6; leakage and <br /> spillage from these drums are the probable sources of the solvents found. <br /> 4.4 SURFACE WATER AND SEDIMENT <br /> 4.4.1 The elements of the surface water systems on the Depot described in <br /> Section 2.2 were addressed in Section 4.1, Investigation of Potential <br /> Contaminant Sources. It appears that surface water and sediment quality <br /> are not impacted by the solvent contaminants found on the site. <br /> 4.5 AIR <br /> 4.5.1 As summarized in the Jefferson Report (1982) , the Depot was visited <br /> by Mr. Robert Goldberg, Department of the Army, Civilian, Air Pollution <br /> Engineering Division, USAEHA, on August 25 through September 1, 1977. The <br /> purpose of the visit was to identify existing air pollution sources and <br /> data and to recommend survey/study support required to generate data which <br /> were necessary for the preparation of an environmental impact assessment. <br /> The locations and operating procedures for the various air pollution <br /> sources at the Depot as identified in that study are listed below: <br /> (a) Paint Spray Booth in Warehouse 10. A conveyor line passes through <br /> this spray booth and the doors for the line were left open, although the <br /> line was not in operation. This reduced the indraft collection capa- <br /> bility. The filters on the booth are adequate for collected overspray. <br /> 4-193 <br />