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Scope of Work for Removal Action in Area C The scope of work in Area C will be limited to the following tasks: • Removal, packaging, transportation, and disposal at a permitted hazardous waste TSD facility, of the contents of the 18-inch by 18-inch by 18-inch concrete sump, contaminated wooden planks from the maintenance pit, and sediments from the two sediment traps. • Decontamination of the 50-fest by 11-feet by 5-feet pit, the 18-inch by 18-inch by 18-inch sump at the bottom of the pit, and concrete support pillars, with the objective of bringing the sump back into service. Rationale behind selecting this removal action for Area C is described in Sections 5.0 and 6.0. Methods of decontamination are described in Section 4.1 • Wipe sampling on the surfaces of the pit and analysis of the samples to monitor the effectiveness of the decontamination process. • Installation of a protective epoxy coating to the surface of the pit as a final remediation step, to prevent future contamination of the concrete walls. 2.3 Area J - DRAINAGE SUMP Prior to 1978, DIPEC performed vehicle maintenance in Building 517. Liquids from these activities, including waste oil, were placed in a floor sump. The sump is 4 feet wide by 10 feet long by 8.33 feet deep (Figure 2). Approximately 900 gallons of an oily liquid occupy the sump to a depth of approximately 3 feet. Analyses for priority pollutant metals and PCBs conducted on the sump oil indicate only lead contamination (110 ppm) to be in excess of 10 times its STLC value, as shown in Table 1. Scope of Work for Removal Action in Area J The scope of work in Area J is limited to the following tasks: • Removal, packaging, transportation and disposal at a permitted hazardous waste TSD facility, of approximately 900 gallons of Pb-contaminated oil. • Decontamination of the 10 feet by 4 feet by 8.3 feet sump, to lower Pb contamination below the STLC for the contaminant (5 ppm) inside the sump. Methods of decontamination are described in Section 4.1 2Liquid Volume = 4'x10' x 3' x 7.48 gallons/ft' = 900 gallons. 8