AR has committed to installing a slurry wall, bulkhead and cap system.

The ultimate goal for One River Street is to return the riverfront to productive use for the community. Atlantic Richfield Company (AR) is moving forward on the environmental remediation of the riverfront as the necessary first stage before redevelopment can occur.

The remediation work being performed by AR is being done under the guidance of New York State Department of Environmental Conservation (NYSDEC) and in accordance with an agreement with the Village of Hastings-on-Hudson and the Riverkeeper, an environmental organization active in projects along the Hudson River.

In 2003, AR, the Village and the Riverkeeper entered into a consent decree outlining AR's remediation obligations and satisfying the concerns of those two parties about the project. In the spring of 2004, NYSDEC issued a Record of Decision (ROD) selecting the environmental remedies to be conducted at the site.

Based on that Record of Decision, AR submitted on time a remedial design work plan to NYSDEC in the fall of 2004 outlining in detail how it would move forward on the project. That work plan was reviewed and accepted by NYSDEC in the spring of 2005.

AR then completed critical environmental investigation work in 2005 necessary to develop what is known as a 50% remedial design. This document will tackle some of the critical issues needed to complete a final design. AR anticipates submitting that 50% design in August 2006. This planning process is anticipated to continue through 2007. Pending approval by NYSDEC, implementation of a final design could begin in 2008.

Here are the key details of the planned remediation of the site:

1. Over the vast majority of the site - about 26 acres - AR will remove any soils containing PCB concentrations greater than 10 ppm (parts per million). AR also will remove soils in areas identified as lead hot spots.
2. In an area of about 1.4 acres known as the northwest corner and northern shoreline area, AR will remove soils containing PCB concentrations greater than 10 ppm to depths of nine to 12 feet then use a slurry wall, bulkhead and cap system to contain any remaining PCBs in place.
3. AR will complete a new bulkhead along most of the waterfront.
4. AR will backfill excavated areas with clean material, then place a contact barrier over the entire site, and cover the site with an additional five foot thick cap of clean material consisting of a six-inch layer of low permeability asphalt, cement or geosynthetics followed by a four-foot layer of clean fill and a six-inch layer of topsoil. This fill will raise the site above the floodplain - a requirement for any future development.