Non-Time-Critical Removal Action
Challenge & Solution
The OU1, Sandy Branch Tributary 2 (Trib 2) is a first-order stream within the middle of a highly industrialized section of a federal government facility in North Carolina. Ecological risks associated with high concentrations of inorganics, polyaromatic hydrocarbons, and pesticides were identified during the Remedial Investigation. A subsequent Engineering Evaluation/Cost Analysis recommended that several “hot spots” within the streambed and surrounding floodplain be removed to minimize ecological risks.
Project Description & Highlights
Due to Rhea’s substantial experience in remedial design and field management and the Client’s high confidence in Rhea’s ability to provide the most thorough and cost-effective environmental services, Rhea was awarded a contract to provide engineering and field services to address the ecological risks of Trib 2.
As the prime on this contract, Rhea performed additional soil sampling to delineate the removal areas, developed the remedial action work plan (including AutoCAD and GIS drawings), solicited bids from various potential subcontractors, selected remediation subcontractors, inspected/managed the field activities at the sites, and provided documentation of the project in the form of a Closeout Report. Field services included the excavation of approximately 800 cubic yards (CY) of floodplain soil, excavation of approximately 125 CY of streambed sediments, disposal of 1,200 tons of non-hazardous waste soil/sediment at a licensed, Subtitle D facility, backfill of excavated areas, and upland and wetland site restoration.
The project was designed to successfully remove impacted sediment and soil while minimizing the impacts to wetland and ecological habitat.