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yU�bU�-JJ4 �Un-4� <br /> screened at 49 to 59 feet BGS, showed TCE at 1.2 ug/l in the last sampling <br /> round, 1988, and LM 34, at 59-69 feet, showed both TCE and PCE at levels <br /> just above the detection limits. Shallow well , LM 43, about 200 feet <br /> directly upgradient from Contaminant Area 3, has never shown TCE or PCE in <br /> samples collected in 1986, 1987, and 1988. Thus, it appears the solvents <br /> in and downgradient of Contaminant Area 3 derive from leaks and spills from <br /> drums of solvents stored and handled in Contaminant Area 3. <br /> 4.3.6.4 Contaminant Area 4. There are two shallow wells in Contaminant <br /> Area 4, LM 26 on the upgradient side and LM 17 on the downgradient side. <br /> Well LM 26, sampled in 1986 and 1988, has shown PCE only at concentrations <br /> below action levels. Well LM 17, installed just north of Building 28, has <br /> shown both TCE and PCE in the 25-40 ug/l range in sampling rounds in 1986 <br /> and 1988. Deeper wells installed just downgradient of LM 17 in 1990 showed <br /> neither TCE nor PCE above detection limits. The one soil boring in the <br /> Contaminant Area, SB 22, showed neither TCE nor PCE above detection <br /> limits. Two soil gas samples near LM 17 and SB 22 both showed total <br /> halocarbons above 50 ug/l (mostly PCE) . Two upgradient soil gas samples, <br /> SV 91 and SV 94, both showed PCE at 29 ug/l . The suspected source of the <br /> contamination found around Well LM 17 is the former sump at the recoup <br /> facility in Building 28. The source of the upgradient PCE is unknown. The <br /> airphotos reviewed (Appendix 0) do not show drum storage in this area. The <br /> most likely source is believed to be undocumented spills arising from the <br /> use of solvents on the Depot. <br /> 4.3.6.5 Contaminant Area 5. There is one shallow well in Contaminant Area <br /> 5, LM 37, and two deeper wells 400 feet downgradient of LM 37, LM 86 and LM <br /> 90. Well LM 37 has shown TCE only, declining from 28 ug/l in 1986 to 12 ug/l <br /> in 1988. The two deeper wells both showed neither TCE nor PCE above detection <br /> limits. Two soil gas samples taken approximately 250 feet east of Well LM 37 <br /> showed PCE at 2 ug/1 . The one soil boring nearby showed neither TCE nor PCE <br /> above detection limits, and the airphotos (Appendix D) showed no drum storage <br /> in the area. The most likely source of the solvents found is one or more <br /> undocumented spills arising from the use of solvents on the Depot. <br /> 4-192 <br />