Current operations are limited to closure activities and the on-site laboratory, the last mentioned of which continues to provide analytical support for the DCD, including capabilities not found elsewhere at DCD. Closure activities are focused on 61 hazardous waste management units, including the following:
14 Subpart I units (chemical storage areas)
43 Subpart J units (tank systems)
1 Subpart O unit (incinerator)
3 Subpart X units (miscellaneous)
Closure activities will involve the facility ventilation system as well, including the carbon filter units; the destruction of a number of buildings from which the bulk of the processing units have already been removed and that will also require asbestos abatement measures; and outside chemical and agent transfer lines.
The current operator of the CAMDS facility, the EG&G Division of URS Corporation, only recently assumed control of the facility, and final closure planning is not complete. However, many of the processing units were dismantled and removed by an earlier contractor. The current contractor has prepared partial closure plans for the material treatment facility and chemical test facility, and acceptance is being negotiated with the UDEQ. Current efforts are directed toward the material treatment facility to refine and test closure procedures. They will be followed by deconstruction of the remaining buildings, from the most contaminated to the least contaminated. For each building, decommissioning work packages will be prepared that recognize the unique processes and contamination history of the building and utilize a 10-step approach for each building as follows:
Establishment of engineering controls and monitoring,
Preparation for work execution,
Decontamination and equipment disposition,
Ventilated vapor screening level (VSL) monitoring,7
Unventilated VSL monitoring,
The VSL concentrations are equivalent to the short-term limit (STL) value, which is a concentration typically expressed in milligrams of specific agent per cubic meter of air. STLs are similar to short-term exposure limits (STELs) but without the 15-minute exposure time component. The VSL and short-term limit values for agents of interest are as follows: GB, 0.0001 mg/m3; VX, 0.00001 mg/m3; mustard agent, 0.003 mg/m3 (NRC, 2007).