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under construction as approved in an email to me, dated March 30, 2016.The new water <br /> - treatment building is considered to be an Environmental Protection Facility, and, as such,the <br /> Division has requested additional details about the building itself and the planning and <br /> scheduling associated with the move. The additional information being submitted as attachments <br /> to this TR request is as follows: <br /> 1. Design plans for the building, stamped by a certified engineer; <br /> 2. A construction schedule, including the transfer and set up of all water treatment <br /> infrastructure; <br /> 3. Design plans for the building slab stamped by a certified engineer; <br /> i. To provide secondary spill containment,the design of the building slab includes a <br /> curb of 8"minimum height along the slap perimeter. The top of this curb will be <br /> used as the anchor surface to support the walls,which then creates a spill <br /> containment area within the building sufficient to hold an estimated volume of <br /> 12,000 gallons. This spill containment volume is greater than the design capacity <br /> of the operating volume of water within the two treatment trains that will be <br /> installed within the building,including tanks, piping and process equipment. <br /> 4. As-Built drawings including a piping and instrumentation diagram will be provided <br /> following building;construction and completed installation of all the water treatment <br /> equipment;and <br /> 5. The following is a description of the construction and treatment activities, which <br /> demonstrates that the required water treatment will not be impacted during relocation of <br /> the existing water treatment equipment into the IWTP: <br /> At present, Cotter is constructing the IWTP which is approximately OR x <br /> 60ft in size,with walls 16ft tall. This facility includes a concrete floor, 8-in <br /> curb, and a suinp that provides 12,000 gallons of secondary containment in the <br /> event of a spill. The IWTP contains two treatment trains. <br /> The first treatment train will, on an as needed basis,process water pumped <br /> from the underground mine pool to reduce the water level within the <br /> mine. This water will enter a clarifier where the pH will be adjusted and <br /> flocculent added to aide in the settlement of heavy metals. Treated water will <br /> then gravity flow from clarifier 41 into large storage tanks. Accumulated <br /> sludge from clarifier#1 will flow via gravity to the existing Back-fill Slurry <br /> Tank from where the sludge will be re-injected into the mine pool after the <br /> addition of carbon and barium chloride under Cotter's UIC permit. <br /> • Treated water flows from the aforementioned large storage tanks to a primary <br /> booster pump that provides the flow/pressure needed for the GE Pro100 <br /> reverse osmosis (RO)treatment units. Permeate(clean water) from the <br /> Pro]00 RO flows to the Clean Water Tank where the pH is monitored and <br /> adjusted,as needed,prior to discharge. Concentrate(dirty water) from the <br /> Pro100 RO flows to the Backfill Slurry Tank were it is commingled with the <br /> sludge from the clarifiers and re-injected into the mine pool. <br /> 2 <br />