| Remedial Investigation, Feasibility Study, Risk Assessment, and Remedial Design
Hosier Road Landfill
(City of Suffolk Landfill)
Suffolk, Virginia
|
The Hosier Road Landfill site is a 67-acre former municipal unlined landfill which had received residues from a pesticide warehouse fire as well as other municipal and industrial wastes for over 25 years.
Major concerns at the site included various leachate outcrops and the effect of the landfill on the nearby Great Dismal Swamp National Wildlife Refuge.
As part of the project ecological assessment, SCS conducted vegetative transects and quantitative and qualitative analyses of the inherent risks posed by the landfill on natural communities.
Based on the findings of the RI/FS report and Risk Assessment, a "No Action" Record of Decision was negotiated with Virginia and EPA Region III. The ROD called for closing the landfill in accordance with applicable RCRA and Virginia solid waste landfill closure regulations.
SCS subsequently prepared plans and specifications for the final closure of the landfill, and provided construction engineering services.
|
| Remedial Investigation and Endangerment Assessment for the Riverfront Landfill, Kansas City, Missouri |
The City of Kansas City, Missouri, formerly operated Riverfront Landfill, a 3.5-mile long former municipal landfill constructed on the floodplain of the Missouri River and operated by the City between 1950 and 1972. After 1972, playgrounds and ball fields were built on the western section of the landfill; the remainder of the site was allowed to revert to grassland and woodlot. EPA reports raised environmental questions and concerns about the site. As a result, the site was closed to the public. A consent agreement was reached between EPA and the City to investigate the groundwater conditions and potential environmental concerns.
SCS conducted groundwater and subsequent surface soils investigations as part of the Remedial Investigation and Endangerment Assessment at the site of the Riverfront Landfill for the City of Kansas City, Missouri.
Among the conclusions and recommendations SCS reached in the report were closure and capping of one area of the site to allow public utilization, and long-term care and monitoring of the remainder of the site by City personnel. Although the contaminant levels in groundwater marginally exceeded guidelines, the EPA agreed with the conclusion of the risk assessment performed by SCS that no further action was necessary.
|
| Manufacturing Facility, Morris Plains, New Jersey |
Historical waste management at this facility and a nearby manufacturing facility resulted in administrative action by NJ and related investigations and remediation of chlorinated solvents in groundwater. SCS successfully designed a containment strategy to capture and treat groundwater from the facility. The treatment system included a unique "closed-loop" approach that eliminated the need for air permits or air monitoring.
SCS performed a Phase I RI and designed a soil vapor extraction system and a groundwater pump-and-treat system. The Phase II RI Work Plan was been approved by NJDEP and was being implemented.
The program includes three main components: 1) a soil vapor extraction system (VES); 2) a groundwater pump-and-treat system; and 3) the excavation of a 20,000-gallon underground storage tank (UST) from a depth of over 25 feet, plus the characterization and management of contaminated soil.
In support of the VES design, SCS conducted a field vapor extraction test program, including one full-scale vapor extraction well and several vapor monitoring wells. SCS prepared detailed design plans and specifications for a full-scale system, including air emissions treatment. The VES is designed to remove VOCs from impacted soil at four areas: two former lagoons, a former outdoor paint stripping area, a former UST, and a former hazardous materials storage area.
SCS prepared a feasibility report for the groundwater pump-and-treat system, which evaluated available technologies to select the most cost-efficient method of remediating the groundwater. The facility's existing New Jersey Pollution Discharge Elimination System (NJPDES) permit was modified to allow discharge of the treated groundwater to an on-site stream.
A detailed evaluation of technologies for remediation of groundwater impacted by chlorinated VOCs was performed. The evaluation considered the strict VOC air emissions requirements imposed by NJDEP. Technologies included in the evaluation included carbon adsorption, ultraviolet light-enhanced oxidation systems, and various air stripping systems (columns and low-profile units) with off-gas treatment (carbon adsorption, catalytic oxidation, and thermal oxidation). Based on the evaluation, low-profile air stripping with closed-loop carbon adsorption of VOCs in the off-gas was selected.
SCS also performed a groundwater inorganic chemistry study to evaluate ionic relationships between on- and off-site groundwater. Relationships between inorganics, hydrogeologic formations, and relative groundwater flow directions were used to assess potential pathways of migration through glacial deposits. |
