Environmental Remediation of the City-Owned Property at 198 River Street and Associated Site Improvements

Description

This project includes the environmental remediation of 198 River Street and associated limited site improvements at 194, 198, and 200 River Street to support the redevelopment of 198 River Street by a private developer. The project will consist of four distinct phases. Phases 1, 2, and 4 will be completed under this contract by the City's selected contractor. Phase 3 will be completed by the private developer and may require temporary demobilization of the City's contractor while the private developer completes the Phase 3 work. The anticipated construction duration for Phases 1 and 2 is 84 calendar days. The duration of Phase 3, by the private developer, is anticipated to be 30 days. The duration of Phase 4 of the project is anticipated to be 60 calendar days.Phase 1 (remediation) includes the demolition and disposal of polychlorinated biphenyl (PCB) contaminated concrete slabs at 194 and 198 River Street; excavation and disposal of contaminated soils (PCBs greater than 50 ppm and other contaminants) from three remedial excavation areas at 198 River Street; along with dewatering, treatment, and discharge of contaminated groundwater to the sanitary sewer to complete the excavation of one of the remedial excavations. Phase 2 includes installation of temporary support of excavation along River Street, excavation for the foundation of the proposed building, construction of a retaining wall, and backfilling and compaction of the site to grades specified to prepare the site for Phase 3. Phase 3 will be completed by the private developer and consists of construction of the proposed building foundation (footings and foundation walls). Phase 4 includes finalizing the temporary support of excavation, backfilling and compaction of the site to final subgrades for construction of the paved parking areas at 194, 198, and 200 River Street, installation of an on-site stormwater drainage system at 194 and 198 River Street, installation of underground electrical service an