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Filter Building expansion under TR-09, approximately 3,000 square feet are used for the Reagent <br /> Room. <br /> Final design of the Reagent Room was completed by Barr Engineering. A complete set of <br /> engineering drawings issued for construction was provided to DRMS as part TR-14 and related <br /> adequacy review responses. Secondary containment and sumps are shown on the engineering <br /> drawings. All designated chemical piping is double walled where piping is located outside of <br /> secondary containment. There are no under drains or liners. The Reagent Room will contain, at a <br /> maximum, 12,730 total gallons of reagents at any given time. The secondary containment <br /> volume for the Reagent Room is 28,019 gallons including the sump volume of 268 gallons, <br /> which is sufficient to contain 110% of the maximum volume of reagents stored. <br /> Mill reagents are mixed and stored in the Reagent Room. Totes or bags (in the case of dry <br /> reagents) of chemicals will be added to the mixing tanks located inside the Reagent Room. The <br /> mine's Spill Prevention Control and Countermeasures (SPCC)Plan and Materials Containment <br /> Plan (MCP) have been updated to account for the management of the designated chemicals in <br /> the Reagent Room. Copies of the SPCC and MCP along with the Emergency Response Plan are <br /> included in Appendix 1 of this Amendment 2 application. <br /> From the Reagent Room mixing tanks, reagents are pumped to storage tanks in the Reagent <br /> Room, then to smaller day tanks in the mill. Piping outside of areas with secondary containment <br /> is double walled. The double-walled piping going into the Mill was field fit and tested by the <br /> contractor prior to use per TR-15 obligations. Reagents will be used in the milling process as <br /> described in Exhibit D and in TR-15. <br /> Empty totes and other reagent containers are returned to the manufacturer when possible or <br /> disposed of in accordance with solid waste regulations. <br /> 2.2 Passive Mine Water Treatment System <br /> Water discharging from the Revenue Portal is near neutral and therefore not considered acid <br /> generating. However, it is possible that certain underground mine workings could intercept veins <br /> conveying acidic water that could have the potential to generate acid mine drainage. Therefore, <br /> the mine water treatment system is discussed as part of the EPP. <br /> Mine water from the underground workings accumulates underground and reports to the main <br /> ditch in the Revenue Tunnel from various sources and eventually discharges at the Revenue <br /> Portal (location UG-5, as shown on EPP Map U-1). Mine water is routed through a five-stage <br /> passive treatment system that was permitted as part of TR-10. The system includes an initial dose <br /> of a flocculant(i.e., ferric chloride)to reduce total suspended solids, a settling pond called the <br /> Mine Water Pond (Mine Water Pond #1), a sulfate reducing bioreactor (Mine Water Pond#2), a <br /> combination of an open channel and pipeline to aerate the water before it reports to a final <br /> M-2012-032 <br /> Amendment 02 Exhibit U <br /> December 2021 U-5 <br />