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

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Administration (MSHA) document, Controlling Mercury Hazards in Gold Mining: A Best<br />

Practices Toolbox.<br />

An impermeable geo-membrane will be installed underneath the proposed TSF Building slab on<br />

grade as an additional level of containment.<br />

A slab seal will be maintained at all floor and wall interfaces. Hard neoprene washers will be<br />

installed where racks are bolted to the slab with conventional anchor bolts. A watertight seal may<br />

be maintained with a durable touch-up epoxy coating. The building will be designed to prevent<br />

cracks in the concrete due to thermal expansion. Cracks that do form will be re-sealed with a<br />

concrete sealer. Waterproof expansion joints in the slab will be sealed with epoxy coating after<br />

being reset with fresh mastic.<br />

Sealing of roll-up doors will be given special attention. Gaps will be eliminated to the fullest<br />

extent possible. The rubberized lower-lip on each roll-up door will be inspected regularly to<br />

ensure seal integrity.<br />

1.1.1 Materials of Construction<br />

Foundation and Floor Slab<br />

The foundation and floor slab will be concrete reinforced with rebar on top of an impermeable<br />

membrane. The membrane barrier protecting the soil below the foundation and floor slab will be<br />

a spray-applied membrane. Liquid Boot, or a functional equivalent, is a two-component spray<br />

designed to quickly and permanently seal the soil below the building prior to construction of the<br />

floor slab.<br />

Building Structure<br />

The building will be constructed using steel columns with steel trusses supporting walls and<br />

ceilings. The interior exposed surface of structural members, concrete walls and floors will be<br />

coated with epoxy enamel.<br />

Roofing<br />

Roofing, awnings, and canopies will be pre-painted metal cladding placed over the steel trusses.<br />

The minimum thickness of the metal sheets will be 24 gauge. Roof insulation will be semi-rigid<br />

fiberglass with a thermally reflective vapor barrier.<br />

Exterior Walls and Main Partitions<br />

The exterior walls will be made from insulated, fire rated, and pre-fabricated concrete panels. All<br />

exterior walls and partitions will be fire-rated and will meet Underwriters Laboratories (UL)<br />

design requirements. The joints between panels, joints between panels and the roof, and joints<br />

between panels and the floor will be sealed with grout or flexible fill and finished with an epoxy<br />

coating. The exterior face of the panels will be covered with exterior pre-painted metal siding.<br />

The interior face of the panels will be coated with epoxy enamel.<br />

PMR <strong>RCRA</strong> <strong>Permit</strong> <strong>Application</strong>, <strong>Dry</strong> <strong>Hills</strong> Facility Page 7<br />

JBR Environmental Consultants, Inc. | HATCH March 2013

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