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Scope of Work for Removal Action in Area A The scope of work in Area A will be limited to the following tasks: • Removal, packaging, transportation and disposal at a permitted hazardous waste TSD (treatment, storage, and disposal) facility of sump contents described in Table 1. • Demolition of the 4 feet by 1.7 feet by 2.5 feet sump (8-inch-thick concrete), followed by removal, packaging, transportation, and disposal at a permitted hazardous waste TSD facility of the debris from the demolished sump. Rationale behind the selection of this removal action is described in Sections 5.0 and 6.0. • Backfill of the excavation with clean soil, followed by compaction of the backfill and installation of a 6-inch-thick concrete surface on the top to match the existing floor level. 2.2 Area C - LOCOMOTIVE MAINTENANCE KIT Railroad cars and locomotives were serviced in the southwest end of Building 816B (Area C), in a service pit that allowed access to the vehicles from below. The concrete service pit is approximately 50 feet long, 11 feet wide and 5 feet deep as measured from the finished floor of the building, as shown in Figure 2. The ground-water table has occasionally risen above the bottom of the pit in the past. An 18-inch by 18-inch by 18-inch concrete sump is located on the floor, in the center of the pit. Water and spilled materials from railroad cars and maintenance engines have been drained to this sump. These liquids were pumped to a storm drain inlet just outside the west door of Building 816B. Currently the sump is almost full with 25 gallons' of an oily liquid. The liquid in the sump is contaminated with 36 parts per million (ppm) of PCBs. Sediments from the storm drain inlets and scrapings from the floor of the pit were tested for priority pollutant metals, PCBs, grease and oil (G&O), total petroleum hydrocarbons (TPH) and VOCs. Analyses of these samples show elevated levels of Sb, PCBs, Cd, and Pb. Table 1 shows the concentrations of contaminants in different phases that exceed their TTLC or STLC values. 125 gallons based on maximum holding capacity of the sump (3.375 cubic feet). 7