Precious Metals Recovery LLC RCRA Permit Application Dry Hills ...

PVC/CPVC is the material which has been selected for much of the process fluids piping. Group
C plastics (e.g., PVC less than 5% plasticized) have a similar burning rate and heat of
combustion to that of ordinary combustibles (e.g., wood, cloth, rubber). Although there may be
varying plasticized compositions of PVC, NFPA offers PVC pipe and pipe fittings as an example
of a Group C plastic. As such, this material will be treated as an ordinary combustible.
Fiber reinforced plastic (FRP) tanks will be included in the process area for storage of various
liquids (e.g., hydrochloric acid, domestic water, process water, etc.). The flammability of FRP
will depend on the fiber, adhesives, and composites used in construction. It will be treated as a
Group A plastic having a heat of combustion and burning rate greater than that of an ordinary
combustible.
Office equipment (e.g., chairs, desks, books, etc.) is expected to be made from ordinary
combustible materials concentrated within the office area and Control Room. The Clean Storage
and Maintenance Area will be expected to contain similar combustible materials.
Indoor Material Storage
A list of materials that will be stored within the proposed TSF Building is presented in Table 1.5-
1. Refer to Appendix 1-A (drawing H340940-0000-50-042-0001) for a general arrangement
showing the storage locations of the various materials.
Table 1.5-1: Materials That Will Be Stored in the Proposed TSF Building
Material
Flammable /
Combustible
Risk
Means of Storage
Elemental Mercury NO Stored as liquid in pigs arranged on spill trays
Calomel Slurry NO 55 Gallon Polymer Drum
Spent Activated Carbon YES 55 Gallon Steel Drum
Treated Activated Carbon YES 55 Gallon Steel Drum
Caustic (NaOH) NO FRP Tank
Hydrochloric Acid (HCl) NO FRP Tank
TMT 15 NO Polymer Drum (HDPE)
Metal pallets NO Warehouse Racks
Office equipment and materials YES Office Space – Storage Area
Calomel Drums (HDPE) YES Floor Space – Storage Area
Overpack Drums (HDPE) YES Floor Space – Storage Area
FRP Tanks YES Floor Space – Process Area
Process Off Gas & Dust Collection YES Dust Collector – Process Area
Miscellaneous consumables (e.g.,
PPE)
YES Floor Space – Storage Area
PMR RCRA Permit Application, Dry Hills Facility Page 44
JBR Environmental Consultants, Inc. | HATCH March 2013