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Technical Revision 25 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 /> 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 /> t 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 /> 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. <br /> ' This tank is piped directly to the permitted outfall. Water is discharged from this tank by <br /> gravity. Because the contents of this tank are of discharge quality, secondary containment is not <br /> ' required. However, Cotter constructed berms around on the mesa, which will contain a spill <br /> from the clean water tank and allow it to soak into the ground. <br /> Mine Permit M-1977-300 <br /> Cotter Corporation(N.S.L.) 10 April 2017 <br />