Contamination Assessment Report Sanitary Sewer - Railyard and Administration Areas Version 3.2.

摘要

This final report documents the contamination survey of the sanitary sewer in the railyard and administrative areas. The sewer collects domestic sewage from buildings in sections 2, 3, 4, 34, and 35. 10 Samples from 5 borings and 5 sediment grab samples from inside manholes were analyzed for volatile and semivolatile organics and metals with separate analyses for AS, HG, and TDGCL. DBCP, CLC2A, CD, CR, CU, ZN, PB, AS, and HG were detected above their respective indicator ranges. Based on the results of the field survey, potential contaminants in this system are contained in sediments within the sewers and in overflow ditches at the lift stations. If the feasibility study determines that additional information is needed, the additional work will consist of (1) Excavation study between manholes 60 and 61, (2) borings in this area, and (3) number of samples from these borings for DBCP and CLC2A. The volume of potentially contaminated material present is estimated at 640 cubic yards.