Michael J. Doherty, PE, Metcalf & Eddy, Inc., 860 North Main Street Extension, Wallingford, CT 06492, Tel: 203-741-2801, Fax: 203-269-8788, Email: michael.doherty@m-e.aecom.com
John L. Albrecht, LEP, Metcalf & Eddy, Inc., 860 North Main Street Extension, Wallingford, CT 06492, Tel: 203-741-2826, Fax: 203-269-8788, Email: john.albrecht@m-e.aecom.com

The Cos Cob Power Plant, located on the west bank of the Mianus River, was constructed 100 years ago to provide electrification to the adjacent railroad in Greenwich, Connecticut .  The plant was decommissioned by the Connecticut Department of Transportation and the property was transferred to the Town of Greenwich.  A targeted brownfields assessment (TBA), using a Triad-based approach, was completed in conjunction with the United States Environmental Protection Agency.   The TBA and subsequent investigations determined site wide soil and adjacent sediments are impacted by the on-site disposal of coal ash from the former plant operations.  Contaminants of concern, including metals and polycyclic aromatic hydrocarbons (PAHs) exceed the Connecticut Department of Environmental Protection (CTDEP) Residential Direct Exposure Criteria (R DEC).  Polychlorinated biphenyls (PCBs) were also identified exceeding the R DEC in numerous locations and at concentrations exceeding 50 mg/kg in two locations.

Remediation was separated into two phases.  Phase 1 included the excavation and off-site disposal of PCBs and other soils exceeding the CTDEP GB Pollutant Mobility Criteria.  Phase 2 will include construction of an earthen cap to render the remaining soils inaccessible.  Approximately 45,000 cubic yards of cap material is required.  Very low cost off-site fill sources, generated from large construction projects, have been identified and coordinated with CTDEP for beneficial reuse at the site.  However, the low cost materials complicate the remediation because they have been delivered to the site prior to the start of the second phase of remediation.  Integration of the capping material grades with final redevelopment grades is critical to the overall project success and is complicated by the timing of the delivery of the low-cost capping materials.  Site remediation will include coordinating three unrelated construction projects to allow for a cost effective remedy.  The project will also include the stabilization of the existing shoreline in order to protect the remedial cap.  The site will be redeveloped as a waterfront park, including the construction of synthetic turf athletic fields and a shoreline walkway and observation area.

Remediating Asbestos at a Brownfields Site Under the New MCP Regulations

Ronald Richards, Shaw Environmental & Infrastructure, 100 Technology Center Drive, Stoughton, MA 02072, Tel: 617-589-5499, Fax: 617-589-2160, Email: ronald.richards@shawgrp.com
Jason Anderson, Shaw Environmental & Infrastructure, 100 Technology Center Drive, Stoughton, MA 02072, Tel: 617-589-7145, Fax: 617-589-2160, Email: jason.anderson@shawgrp.com 
Christen Sardano, Shaw Environmental & Infrastructure, 100 Technology Center Drive, Stoughton, MA 02072, Tel: 617-589-7261, Fax: 617-589-2160, Email: christen.sardano@shawgrp.com

New Massachusetts Contingency Plan (MCP) regulations governing the management of asbestos containing material are being promulgated in 2007.  This presentation will provide an overview of the new regulations and the practical implications.  On a specific project basis, the presentation will examine those activities that will be required at the Former Oxford Paper Mill Site in Lawrence Massachusetts in order to comply with the new regulations.  Details are provided regarding the design and project changes that were required to address the new regulations.  In general, some of the potential impacts to Brownfields construction are discussed.   

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