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7.0 COST ESTIMATE Based on the removal action objectives and alternatives available, a cost estimate has been developed for the preferred response action for each of the three Areas A, C, and J. The cost estimate is based on budgetary proposals received from the subcontractors and previous experience, and as such is preliminary in nature. A variance of-15 percent and +30 percent should therefore be used in considering the costs involved. The costs are presented as Table 4 in this EE/CA. Furthermore, this removal action plan for Areas A, C, and J is an interim plan, and the scope of work is restricted to tasks described in Section 2.0. As such, remediation and sampling of any contaminated soil around the sump and pit or monitoring of ground water is not considered in this plan. Concerns about soil and ground-water contamination will be addressed in a larger plan for clean up at site 5 in Areas A through J. 8.0 SUMMARY AND CONCLUSION An SI report prepared by ERM-West (1989) identified the three areas (A, C, and J) where removal work could be carried out immediately without further study. The removal action in Areas A, C, and J would be limited to the following: Area A: Removal of sump contents (Building 816B). Area C: Cleaning the locomotive service pit and removal of sediments from the sediment trap (Building 816B). Area J: Removal of sump contents (Building 517). Based on the data available concerning the extent of contamination and removal objectives in each of the above three areas, removal alternatives were identified and analyzed for their appropriateness in this EE/CA. A numerical grading system was used to quantify the advantages and disadvantages of three different removal alternatives for each of the areas. The analysis indicated that demolition of the sump in Area A, clean up of the maintenance pit in Area C for reuse, and clean up and abandonment the sump in Area J were the preferred removal actions for the three areas. A cost estimate for the preferred removal action in each area is also presented in this EE/CA. 23