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

1.1.4 Heating, Ventilation, and Air Conditioning
General
Ventilation
Illustration of the overall ventilation system is shown in Figure 1.1-1 below with the
HVAC Control Schematic provided in Appendix 1-A H340940-0000-45-083-0001.
Independent HVAC units are provided for each of the six areas in the proposed TSF.
The hygiene exhaust system will maintain the negative pressure in the proposed
TSF’s plant spaces.
Note: Hygiene gas is the interior air in the plant spaces (i.e., all areas except the
Office Area).
The building is designed to be as air tight as practical. Ventilation will be provided to create an
overall negative pressure in the plant spaces, so that air flow will be forced to go from the
outside environment into the building (refer to Figure 1.1-1 and Appendix 1-A H340940-0000-
45-083-0001). All exhaust from the proposed TSF Building is designed to exit through one
exhaust duct. Exhaust emissions will meet the criteria specified in Section 1.2.6.
The office/clean area will be maintained under positive pressure by fresh air from the outdoor
environment, therefore, if there is any leakage, air will flow from the office area into the plant
spaces. Temperatures in the process and storage areas will typically be maintained at or below
70°F to prevent mercury volatilization.
The plant spaces will be ventilated to create at least three air changes per hour in the process
area. The exhaust air from the plant spaces will pass through a dust collector to remove any dust
prior to entering a High Efficiency Particulate Air (HEPA) filter for further polishing, and will
finally pass through a carbon filter for mercury control prior to exhausting to atmosphere.
Individually enclosed ventilation points, such as tank vents and ventilation for calomel feed
preparation will be cleaned in multi-staged, carbon-filtration units and then tied into the main
exhaust.
PMR RCRA Permit Application, Dry Hills Facility Page 12
JBR Environmental Consultants, Inc. | HATCH March 2013