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Technical Revision 25, Rev. I Schwartzwalder Mine <br /> 3.0 TR 24 AMENDMENT <br /> This section describes the additional facilities that have been added to the NWTP, as required in <br /> the Hard Rock, Metal, and Designated Mining Operations, Rules and Regulations, Section <br /> 6.4.21(7). The following sections will discuss each of the criteria presented in the <br /> aforementioned regulation. In some cases, the required information is present in the <br /> Environmental Protection Plan (EPP), Revision 1, submitted and approved as part of TR-23 <br /> (Whetstone, 2016). In those cases, Cotter will reference the approved EPP. Within 60 days of <br /> pp Y <br /> the approval of TR-25, Cotter will submit the EPP, Revision 2, which will incorporate changes to <br /> the NWTP. <br /> 3.1 DESCRIPTION OF ADDITIONAL FACILITIES <br /> Figures 3-1 and 3-2 presents a diagram of the NWTP and a site layout of the NWTP area, <br /> respectively, once all construction has been completed. New structures added to the NWTP <br /> since the approval of TR-24 are as described below. <br /> 3.1.1 Treated Water Storage Tanks <br /> Cotter installed two, 20,0000-gallon treated water storage tanks outside the south wall of the <br /> NWTP. These tanks collect effluent from the clarifiers prior to treatment by the reverse osmosis <br /> (RO) units. These tanks are 12 feet in diameter and 25 feet high. Although the capacity of these <br /> tanks is a total of 40,000 gallons, Cotter can only store a maximum of 20,000 gallons in both <br /> tanks combined (10,000 gallons per tank) because of the necessary plumbing connections. <br /> Water enters the treated water tanks via gravity flow from the clarifiers. Once the water level <br /> reaches a certain the level of the tank inlet, water will no longer flow into the tank. Therefore, <br /> capacity is naturally limited by virtue of the NWTP design. The treated water tanks are installed <br /> in a lined berm with a capacity of 30,000 gallons. Therefore, this bermed area can contain the <br /> j entire contents of the both treated water tanks. <br /> 3.1.2 Clean Water Tank <br /> - Cotter installed one, 4,300-gallon clean water tank outside the south wall of the NWTP. This <br /> tank is used for mixing clean effluent from the ion exchange (IX) system with sodium hydroxide <br /> prior to discharge. Cotter's NWTP is configured such that the IX system polishes effluent from <br /> the RO system. Sodium hydroxide is stored and injected from within the NWTP building, and is <br /> mixed to obtain an accurate pH measurement; pH measurements are collected to determine <br /> compliance with Cotter's discharge permit. This tank is piped directly to the permitted outfall, <br /> and water is discharged from this tank by gravity. Cotter does not intend to place the clean water <br /> tank within a secondary containment for reasons discussed below. <br /> The RO technology at the NWTP uses a physical barrier to filter the highly pressurized water <br /> and divides the influent stream into two effluent streams. The treated water that leaves the RO <br /> system, also known as permeate. Permeate, which is ultimately discharged to the permitted <br /> Mine Permit M-1977-300 <br /> Cotter Corporation(N.S.L.) 10 June 2017 fi <br />