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5 Designated Chemicals and Materials Handling <br /> Table U-2 provides a listing of the volume and total amount of each chemical reagent stored on <br /> site including the new Reagent Room. Reagents will be staged at the Main Warehouse in Ouray <br /> and transported to the mine by delivery truck on an as needed basis. Once on site, reagents are be <br /> offloaded to the Reagent Room. The maximum storage amounts of each chemical that will be <br /> stored in the Reagent Room at any given time are provided in Table U-3. Reagents are stored in <br /> their manufacturer-supplied containers and are used as needed in the milling process. The <br /> Reagent Room has sufficient secondary containment to prevent releases of designated chemicals. <br /> In general, chemical reagents will not be stored in the previously permitted mill reagent room <br /> (old reagent room). The plan is to transport enough chemicals to fill the mixing, storage and day <br /> tanks to operate the mill. However, Per TR-14, OSMI anticipates that minor amount of <br /> chemicals may be stored in the old reagent room on an as needed basis if the chemicals need to <br /> be moved from the new Reagent Room for maintenance or similar activity. The old reagent room <br /> would be used as a staging area rather than storage area. The chemicals will be placed just inside <br /> of the garage doors that access the old reagent room. <br /> There is sufficient secondary containment volume in the old reagent room to accommodate <br /> temporary chemical storage. Specifically, the old reagent room of the mill filter building is <br /> roughly 60'x25' and has an 8" curb for containment, plus a 50-gallon sump. This room has <br /> approximately 8,500 gallons of secondary containment. As noted above, the old reagent room <br /> will be used for temporary staging of chemicals, as needed. The chemicals will be placed on spill <br /> pallets to prevent mixing. <br /> 5.1 Reagent Handling <br /> The chemical list for the mill operation is listed below in Table U-2. <br /> Table U-2 List of Reagents and Volumes Stored on Site <br /> Mixing <br /> Reagent Dal Tank /storage Packaging <br /> Total Comment <br /> (g ) tanks(gal) (g <br /> 120gal mixing tank feeding <br /> Zinc Sulfate 70 240 18 328 120gal solution tank& <br /> packaging-day tank in mill <br /> tunnel <br /> 140gal mixing tank feeding <br /> Sodium Metabisulfite 70 280 40 390 140gal solution tank& <br /> packaging-day tank in mill <br /> tunnel <br /> M-2012-032 <br /> Amendment 02 Exhibit U <br /> December 2021 U-11 <br />