ROWE INDUSTRIES SUPERFUND SITE
SAG HARBOR, NEW YORK

LBG conducted the Remedial Investigation (RI), the Feasibility Study (FS), the Remedial Design (RD), and is in the process of implementing the Remedial Actions (RA) for this Superfund site in which chlorinated solvents are the primary compounds of concern. The soil remedy consists primarily of soil vapor extraction (SVE) through the use of 15 wells segregated into 5 smaller groups, each group having its own manifold. The configuration of wells and manifolds allows for a great degree of flexibility in operating the wells, the purpose being to change subsurface airflow patterns in order to maximize remediation of the soil. The soil vapor is extracted by a regenerative blower at a rate of about 700 cfm. Emissions are controlled by routing the vapor through two 1,500 pound carbon filters positioned in series. The ITPP prepared by LBG established baseline operational data that is being used to guide operation of the system to achieve the most effective removal of VOCs. LBG is responsible for operating, maintaining, and monitoring the SVE system. About 600 pounds of VOCs were removed by the SVE system during the first 15 months of operation.

Construction of the ground water remedy, which will consist of 9 recovery wells for the collection, treatment, and disposal of about 650 gpm of water, is scheduled to begin construction in April 2000.

Because 10 of the SVE wells are on an adjacent residential property to which access is limited, and because of the onsite traffic associated with the operating facility, the controls and monitoring apparatus for the SVE wells was combined in a vault that is located outside of the most active areas. As a result, the need to enter the adjacent residential property and interrupt onsite traffic has been minimized.

Based on the results of a value engineering analysis conducted by LBG, a heat exchanger was installed in the SVE system prior to the carbon filters to increase the efficiency of VOC removal and utilization of carbon, thereby reducing the operational costs.

Grossly contaminated soils at the adjacent residential property were excavated to a depth of four feet below grade out of concerns about direct exposure. About 300 tons of grossly contaminated soil was segregated from 2000 tons of less-impacted soils and placed into an above-ground impoundment for onsite treatment using SVE. After 7 months of operation, the soil was acceptable for land disposal, which resulted in a net savings of about $60,000 compared to the cost of taking the soil directly offsite for disposal.