Remedial Design
Pendleton, NY
Services:
- Pre-Design Investigations
- Site Survey
- Wetland Delineation
- Ground and Surface Water Sampling
- Background Soil Sampling
- Lake Sediment Profiling and Sampling
- Treatability Testing
- Geotechnical Tests
- Liner Compatibility
- Remedial Design and Action
- Operation, Maintenance, and Monitoring
- Design Consultation During Construction
Schedule: 1993 - Present
Budget: $1.1 Million
Tasks:
- Dredging, stabilization, and placement on-site of contaminated lake sediments
- Installed multi-layered cap incorporating a geomembrane (or technical equivalent)
- Designed ground water collection system to maintain an inward hydraulic gradient
- Designed grouted sheetpile wall to provide containment boundary for contaminated soils and assist ground water collection system in maintaining inward hydraulic gradient
- Designed physical controls to control surface drainage and overflow
- Designed monitoring system to monitor effectiveness of selected remedy
- Prepared Construction Certification Report and Site Operation and Maintenance (O&M) Plan
- Provided ground water monitoring services in accordance with the O&M Plan
Project Highlights:
- Dewatered a 15-acre lake to excavate and stabilize sediments
- Designed low permeability cap to contain 66,000 cy of material
- Lateral expansion of low permeability cap enabled client to avoid excavation of soils and waste materials
- Created new wetlands to replace those impacted during remediation
- Met all Consent Order dates for the remedial design
- A field modification of the geometry of the ground water collection trench resulted in a reduction of approximately $100,000 of the bid price for the trench
- Proposed alternate approach was estimated to cost approximately $4 million less than the estimate presented in the ROD for the NYSDEC-specified remedy
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