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Record of Decision System (RODS)



Address:  COUNTY RTE 9 
City & State:  MINERAL COUNTY  WV  26753
County:  MINERAL
EPA ID:  WV0170023691
EPA Region:  03
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/541/R-97/089
ROD Date:  02/12/1997
Operable Unit(s):  01
Media:  Surface soils
Contaminant:  Trichloroethene (TCE), methylene chloride (MC), and acetone; fluorescent tubes (mercury source); laboratory and photogenic chemicals; fiberglass, metals, resin coated fibers
Abstract:  Allegany Ballistics Laboratory (ABL) is located at Rocket Center, in the north-central panhandle of West Virginia, about 10 miles south of Cumberland, Maryland. ABL consists of two separate industrial plant areas. Plant 1 occupies approximately 1,572 acres and is owned by the U.S. Navy and operated by Alliant Techsystems. The industrial portion (400 acres) of Plant 1 is located on an alluvial plain adjacent to the North Branch Potomac River. Plant 1 is the portion of ABL that was listed on the National Priorities List (NPL) in 1994. Plant 2, a 56-acre area adjacent to Plant 1, is owned exclusively by Alliant Techsystems, and is not listed on the NPL. Groundwater production wells, which are located approximately 2,000 feet southeast of Site 5, supply potable water to ABL. Natural springs are located near the wells. Commercial limestone quarries are also located within 3,000 feet south of Site 5. The Site 5 landfill operated from the early 1960s to 1985 accepting wastes generated by ABL and deemed to be inert. Inert wastes were defined as wastes not contaminated with explosives nor generated at an area on the facility where explosives were managed. Wastes reported to have been disposed of at Site 5 include drums that previously contained trichloroethane (TCE), methylene chloride (MC), and acetone; fluorescent tubes (mercury source); unknown laboratory and photographic chemicals; fiberglass and other resin-coated fibers; metal and plastic machining wastes; and construction and demolition debris.
Remedy:  The Navy will manage the remediation of the landfill in two phases or Operable Units (OUs). The remedial action selected in this Record of Decision (ROD) addresses contamination associated with Site 5 landfill contents and surface soils and is to be implemented as Operable Unit 1 (OU1). OU 2, defined as the contaminated groundwater beneath Site 5 and near Site 5, will undergo further evaluation and will be monitored during operations for OU 1.The selected remedy for Site 5/OU 1 is a Composite Cap-Geosynthetic Clay Liner (GCL) and Flexible Membrane Cap (FMC). The major components of the selected remedy are: deed notation along with property use and limited access restrictions; installation of a composite Cap-GCL and FMC; installation of a drainage layer utilizing a geonet; installation of a passive landfill gas (LFG) venting system; revegetation of the capped area; installation of perimeter drainage system; and post-closure requirements.
Text:  View full-text ROD [ 68K ]
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