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TR-34 to Permit M-1977-342 <br /> Environmental Protection Plan <br /> effluent using a clarifier. Clarifier overflow, or effluent, undergoes pH neutralization using <br /> sulfuric acid and is discharged under CDPS permit#CO-0041467 (see Tables 3-1 and 4-1 above). <br /> Solids(or sludge)consisting of the metals removed in the treatment process are piped to sludge <br /> cells immediately east of the WTP. The dry solids are characterized before being transported <br /> to an approved solid waste landfill for final disposal. <br /> The URAD WTP utilizes other ponds in addition to the Buffer Pond and Sludge Cells. 2 Pond is <br /> utilized as a holding cell for solids that are dredged annually from the Buffer Pond. Both the 2 <br /> Pond and J Pond can also be used for emergency overflow storage. Water is conveyed from 2 <br /> Pond and J Pond back to the Buffer Pond for processing through the WTP. <br /> Effectiveness: Utilizing the monitoring and maintenance routines detailed below, the Mine <br /> water settlers, conveyance system and appurtenances have been demonstrated to be effective <br /> for the conveyance and treatment of Mine water. <br /> Monitoring: The Mine water system is routinely inspected by Mine personnel to assess <br /> effectiveness and integrity. Scheduled preventative maintenance, including pigging (cleaning) <br /> of the pipelines, is performed to mitigate the build-up of scale inside the pipelines. Further <br /> maintenance and/or updates to facilities, systems, equipment, or procedures are performed as <br /> needed to be protective of the environment and to prevent releases. Effluent from the URAD <br /> WTP is routinely monitored as required by its CDPS discharge permit. <br /> Mine EPF 1.2—Stormwater Diversion System: <br /> A stormwater diversion system has been constructed on the south side of the Mine office and <br /> surface operations to divert un-impacted stormwater around industrial activities.The diversion <br /> ditch retains or conveys storm water from the south side of the upper yard west to Butler Gulch. <br /> Water from the east side of the upper yard and along the southeast side of the mine facilities <br /> are conveyed east to the West Fork of Clear Creek. See Section 10.2 for additional information <br /> on stormwater. <br /> Effectiveness: The stormwater diversion system has been effective in preventing the amount <br /> of stormwater that can come into contact with disturbed land and potentially toxic or acid <br /> forming materials. As a result, the volume, or quantity of potentially impacted stormwater is <br /> greatly reduced. <br /> Monitoring: The stormwater diversion system is inspected twice per year in accordance with <br /> Henderson's Stormwater Management Plan (SWMP). See Section 10.2 for additional <br /> information. <br /> Mine EPF 1.3—Pond 1.2 <br /> Pond 1.2 is a 26 acre-foot, subgrade lined pond located southeast of the Mine entrance gate <br /> that was originally designed as a mine water sedimentation pond. The pond was subsequently <br /> repurposed and approved in TR-08 (approved 9/7/1999) for the storage of HDS generated at <br /> the URAD WTP. The pond has been maintained in an inactive state since that time. <br /> Effectiveness: Pond 1.2 and has been designed and operated with appropriate engineering <br /> controls and redundancies as stipulated in the original TR. <br /> Monitoring: Periodic visual inspections are conducted by Mine personnel to assess integrity. <br /> Climax Molybdenum Company August,2021 <br /> Henderson Operations Page 18 of 45 <br />