Implementation of Pre-design Work Plan, Site Remedial Design, and Construction Phase Services  Sullivan’s Ledge Superfund Site, New Bedford, Massachusetts Services:      Pre-design Investigations   Remedial Design Remedial Action Operation, Maintenance, and Monitoring  Schedule: 1992 - Present  Budget: $10.6 Million Tasks: Ground Water Monitoring Bedrock Hydrogeological Evaluation Ground Water Bench- and Pilot-scale Testing Air Monitoring and Air Toxics Evaluation Soil Sampling Treatability Review of Solidification Developed and Evaluated Capping Alternatives Sediment Excavation and Dewatering Techniques Stream Diversion and Stream Lining Alternatives Storm Water Management Ground Water Recovery System Ground Water Pump & Treatment System Landfill Cap and Gas Mitigation System Stream Lining Sediment Removal Soil-bentonite Cutoff Wall   Project Highlights:   Completed field work and project reporting deliverables in 12 months Soil and sediment cleanup via excavation, consolidation, and on-site containment Provided technical justification for modification to the Record of Decision (ROD) through an Explanation of Significant Differences, which resulted in the elimination of the need to excavate and solidify 46,000 to 82,000 yd3 of soil and debris. The projected cost savings was $14 million. Provided technical justification for use of an alternate form of ultraviolet oxidation for ground water treatment, resulting in less concern regarding air emissions Modified the overall approach for ground water treatment, resulting in a projected cost saving of approximately $3.9 million Used statistical analysis to justify the elimination of two rounds of ground water monitoring, resulting in cost savings of approximately $400,000 Used results of a settlement analysis to design a geo-grid reinforcing system for the cap at the quarry pit edges. This innovative approach resulted in cost savings of approximately $750,000 over a more conventional approach Used the results of air dispersion modeling to provide technical justification for not having to treat collected landfill gas  Return to Project listing