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4 Designated Chemical Evaluation <br /> The following section provides information about the types, quantities, and concentrations of <br /> designated chemicals within the affected lands boundary and provides information relating to <br /> their known potential impacts to human health and the environment. In addition, the expected <br /> concentrations, process solution volumes and fate of designated chemicals is provided in this <br /> section. <br /> A list of chemicals to be used in the underground mill for ore processing is provided in Table U- <br /> 1 of this Exhibit U, which provides the information required by Rule 6.4.21(5). <br /> In addition to mill reagents, other chemicals are used on site, but are not considered designated <br /> chemicals. These include: <br /> • Magnesium chloride or a similar non-hazardous chemical may be used to treat haul roads <br /> within the mine, the TSF area and the portion of County Road 361 that is needed to <br /> access the Atlas TSF. The chemical, if used, will be added in a dilute solution to the road <br /> surface. The hard surface created by this treatment minimizes the amount of fugitive dust <br /> generated by mine activities. <br /> • Ferric Chloride used as a flocculant for water treatment. This material is an approved <br /> treatment chemical under OSMI's CDPS Permit No. CO-0000003. <br /> • Diesel fuel, small amounts of oils, and antifreeze are used in the mine equipment. Storage <br /> and use of these products are discussed in Exhibit D and the SPCC Plan. <br /> M-2012-032 <br /> Amendment 02 Exhibit U <br /> December 2021 U-10 <br />