2022-04-05_REVISION - M1977342 - Laserfiche WebLink

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Climax Molybdenum Company Permit No.1977-342 Technical Revision (TR-35) F The WTP building will house the HDS processes and clarifier and will be approximately 105 feet wide and 150 feet long; Final treated water will gravity flow from the WTP to the discharge point at the Williams Fork Pump Station (Outfall 007) through the existing Williams Fork Pipeline; Feed water to the WTP will be supplied from the mill process water circuit; The plant will be equipped to divert and re-process water that does not meet discharge specifications; An emergency generator will be installed that will keep key process equipment operating during power outages; and The general site layout has been designed so that surface flow surrounding the site will be maintained within the process water system by routing flow to the TSF through the Bear Paw pipeline. Current design drawings for the WTP are presented in Appendix A and referenced throughout the following subsections. 2.1 Plant Location and Site Layout The proposed WTP will be constructed at approximate coordinates 39°50'52.17"N, 106' 4'39.32"W, northeast of the mill building in a previously disturbed area within the Mill Complex and current Affected Land Boundary. The WTP Project Area within the overall context of Henderson Mill facility is presented on Figure 1. The detailed site layout drawing for the area immediately around the proposed WTP are provided in drawings 530-DD10-PLN-601 and 530-DD10-PLN-602 in Appendix A. Drawings in Appendix A have been developed by Wood, the design engineer for the project, and generally represent an "Issue for Construction" level of design. Certain details depicted on the drawings, such as internal piping layouts, are subject to change as the project continues into construction, however, very little is anticipated to change relative to major equipment, overall layout, and building configurations. The detailed general arrangement drawing and section for the interior of the WTP are provided as drawings 530- DE10-GAD-101,530-DE10-GAD-102 and 530-DD30-PLN-401 in Appendix A. The WTP will be a pre-engineered steel building with concrete floor and foundation approximately 105 ft by 150 ft in size with an eve height of approximately 45 ft. Exterior to the steel building the lime silo and CO2 storage tank will be located on the south side of the WTP and the emergency generator and the transformer will be located on the west side of the WTP. The interior of the WTP comprises a large central area where the HDS reactor tanks, clarifier, gravity filters, lime slurry tank, spent backwash tank, effluent tank, sludge storage tank, flocculant and polymer system, and associated pumps and equipment will be located. Located on the outer perimeter wall of the WTP will be the break room,control room, restrooms, lab,and maintenance shop area(on the east wall),flocculant storage area (on the north wall), and electrical room, and communication room, with a small extension for compressors (on the west wall). The WTP has been designed with sumps to catch overflows and spills. These sumps will return captured water to the treatment process. Water for industrial uses and potable treatment supply will be provided by the raw water pipeline,which ties into the mill.A small reverse osmosis potable water treatment system capable of treating 2.8 gallons per minute on average and will be equipped with a 1,000-gallon storage tank. The area immediately surrounding the WTP will be asphalt paved, with a designated parking area located on the east side of the WTP building. The improved area will be graded to route stormwater flow to perimeter stormwater collection swales. These stormwater drainage swales direct drainage to existing drainage swales which route stormwater flow to the Bear Paw Drainage Pipeline inlet which drains to the TSF, maintaining stormwater within the process water system. Drainage from the roof of the building will also be captured in a gutter system and directed to the Bear Paw Drainage Pipeline Inlet in a buried pipeline. The existing Bear Paw pipeline captures runoff from other areas of the mill complex as well and conveys these flows to the TSF where it is managed as part of the process water system. Stormwater will flow to the TSF and be recirculated through the mill process water system. April 2022