Superfund Information Systems: Site Profile

Superfund Site:

ARROWHEAD ASSOCIATES, INC./SCOVILL CORP.
MONTROSS, VA

Cleanup Activities

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Background

The Site is located approximately two miles southeast of the Town of Montross, Westmoreland County, Virginia.  It is situated within Virginia’s Northern Neck region between the Rappahannock and Potomac Rivers.  The Site occupies approximately 30 acres of land on the east side of State Route 3. The western portion of the Site consists of a one-story manufacturing building, and a parking lot. The eastern portion of the Site contained five former sludge settling ponds and a treated wastewater pond. 

Two former sewage water treatment ponds were located near the eastern edge of the property, which were used to treat sanitary wastewater generated by the facility.  In addition, one chlorinated solvent tank and one acid tank are located along the northern edge of the facility. Both tanks are above-ground storage tanks and are presently empty. 

A EPA removal action successfully reduced the risks presented by contaminated soils, on-site residual process wastes, and contaminated containers and manufacturing equipment at the Site.  Nevertheless, significant residual contamination of isolated soil and underlying groundwater remained.  Given the extent of contamination at the Site, EPA proposed it for inclusion on the National Priorities List (NPL), 40 C.F.R. Part 300, Appendix B, in June 1988. The NPL is a list of the nation most hazardous waste Sites. Once listed on the NPL, a Site can receive federal funding for a cleanup. The Site was added to the NPL in February 1990.  

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What Is Being Done to Clean Up the Site?

The remedy for the site included:

  • construction of a soil vapor extraction system (SVE) to remove volatile organics from contaminated soil
  • construction of a Permeable Reactive Subsurface Barrier (PRSB) System to transform dissolved volatile organic compounds (VOCs) into non-toxic products before groundwater discharges into the tributaries of the Scates Branch
  • construction of a surface Cap System to limit the surface water infiltration into the subsurface immediately up-gradient of the PRSB
  • implementation of an environmental plan to evaluate the effectiveness of the remedial action and to ensure the protection of environmental receptors in the Scates Branches
  • implementation of institutional control measures, prohibiting the use of contaminated groundwater from the Yorktown/Easton unconfined aquifer (shallow aquifer) to ensure the protection of human health and the environment.

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What Is the Current Site Status?

  • A new remedial investigation/feasibility (RI/FS) for operable unit 3 (OU3) is ongoing.
  • This operable unit will address OU1, OU2, and new contaminants located down gradient from the Permeable Reactive Subsurface Barrier (PRSB) System and landfill cap, and new contaminants found beneath the former manufacturing building. 
  • In addition, it will address 1, 4-Dioxane in groundwater, surface water and vapor intrusion (VI) in the building.
  • Vapor intrusion is when certain chemicals, knowm as volatile organic compounds (VOCs), can turn into vapor or gases, potentially affecting human health and the environment.
  • EPA is currently overseeing the effectiveness of VI mitigation systems in the building.

 

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EPA’s Involvement at the Site

  • EPA began investigating the site in 2008.
  • The investigation included collecting subsurface soil samples, groundwater samples, collecting surface water samples; collecting vapor samples from the landfill cap; collecting sub-slab soil gas from under the manufacturing building; collecting indoor air samples from the manufacturing building; and collecting samples from seeps.
  • Quarterly monitoring reports were prepared from July 2009 through October 2012.
  • Based on the sampling and monitoring reports, EPA determined that a new remedial investigation/feasibility (RI/FS) for operable unit (OU3) was needed.
  • This operable unit addresses OU1, OU2, and new contaminants located down gradient from the Permeable Reactive Subsurface Barrier (PRSB) System and landfill cap, and new contaminants found beneath the former manufacturing building. it will also address 1, 4-Dioxane in groundwater, surface water and vapor intrusion inside the building.
  • Vapor intrusion can occur when certain chemicals, known as volatile organic compounds (VOCs) turn into vapor or gases, potentially affecting human health and the environment.
  • EPA is currently overseeing the effectiveness of VI mitigation systems in the building.

 

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