Construction
Completion Report
Final Remedial Action documentation for the Former ALCO Plant Site, Operable Unit 01.
Professional Certification
This report documents the remedial activities performed by ENTACT, LLC under the direct supervision of qualified environmental professionals in the State of New York.
These regulations govern the Environmental Remediation Programs in New York State. Compliance ensures that the cleanup meets stringent safety standards for future land use, ranging from industrial to restricted-residential.
All construction activities were completed in substantial conformance with the NYSDEC-approved Remedial Design. This certification encompasses the mobilization, material management, and shoreline stabilization essential for Site No. 447001.
Technical Verification
NYSDEC Technical Guidance for Site Investigation and Remediation. It serves as the "rulebook" for how environmental cleanups must be documented and executed in New York.
Detailed Scope of Remedial Actions
Comprehensive summary of the four-phase construction effort conducted by ENTACT at the Former ALCO Plant.
- Mobilization and Infrastructure Setup: Delivery of heavy equipment, establishment of decontamination pads, and installation of site perimeter security. This phase included the creation of temporary haul roads and material staging areas specifically designed to prevent cross-contamination during active excavation.
- Implementation of Community Air Monitoring (CAMP): Rigorous deployment of fixed and mobile monitoring stations at the site boundary. These systems provided real-time data on particulates (dust) and volatile organic compounds (VOCs). If predefined action levels were reached, construction activities were paused and mitigation measures, such as water suppression, were applied immediately.
- Shoreline Excavation and Stabilization (Phase II-A): Targeted removal of impacted sediments and soils along the Mohawk River. Following excavation, the shoreline was armored with heavy rip-rap and engineering fabrics to provide long-term structural integrity and prevent any residual migration into the river ecosystem.
- Impacted Soil Management and Disposal: Precise excavation of soils exceeding the restricted-residential cleanup objectives. Each batch of excavated material was stockpiled on plastic liners, sampled for waste characterization (including PCBs, VOCs, and metals), and transported to permitted off-site facilities for final thermal treatment or landfill disposal.
- Importation of Clean Backfill: Sourcing and verification of off-site fill material to ensure it met NYSDEC "Clean Fill" requirements under 6 NYCRR Part 375-6.7(d). This process involved chemical testing of borrow sources at specified frequencies to prevent the introduction of new contaminants to the site.
- Sub-Surface Utility Coordination: Careful identification and protection of active utility corridors during intrusive activities. In areas where excavation was prohibited by critical infrastructure, alternative engineering controls or in-situ stabilization methods were evaluated to ensure the remedy remained protective.
- Final Grading and Institutional Controls: Precision grading to support future redevelopment and management of stormwater. The scope included the preparation of the final site cover system, which acts as a physical barrier between the remaining sub-surface soil and future occupants.
- Decontamination and Demobilization: Thorough cleaning of all earth-moving equipment using high-pressure steam and scrubbers before leaving the exclusion zone. This ensured no impacted material was tracked onto public roadways (Schenectady streets) or neighboring properties.
Polychlorinated Biphenyls. Industrial chemicals once used in electrical transformers at the ALCO plant, known for their persistence in the environment.
Large, durable rocks used to protect shorelines and structures from erosion caused by water current or wave action.
Volatile Organic Compounds. Chemical contaminants that easily evaporate into the air, necessitating strict monitoring during soil disturbance.
Action Milestones
Phase I & II Completion
Initial soil removal and major shoreline armoring activities finalized under NYSDEC oversight.
Phase III Completion
Final site stabilization and demobilization of ENTACT construction crews.
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