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_�'w <br /> OURAY SILVER MINE-5 <br /> regarding the total volume capacity of each sump system for each containment area <br /> pursuant to Rule 6.4.21(6)(b)(iii). <br /> Please see drawing 700-PI-002. The flocculant sump reports to the flocculant mixing tank and the lime <br /> sump reports to the tailings thickener as shown in the flocculant and hydrated lime sections of drawing <br /> 700-PI-002. The volume of the sump in the flocculant area is 12 cubic feet and the lime sump is 27 cubic <br /> feet as shown in drawing 700-FF-104 section 9. <br /> a. In addition please clarify why only the flocculent and lime areas are depicted to <br /> have sump systems installed. <br /> Areas other than the flocculent and lime areas have dedicated containment and contain smaller <br /> quantities of chemicals. The floor slabs are sloped to direct fluids to a certain area. In the event of a spill <br /> in these areas a mobile floor sump pump will be used to pump the chemical into the respective mixing <br /> tank. <br /> 18. Provide more detailed information related to the site specific conditions related to <br /> construction activities in support of the reagent room prior to TR-14 submission per Rule <br /> 6.4.21(7)(a).The information should include but is not limited to; <br /> a. The narrative as well as Table 3 demonstrate that the foundation excavation has <br /> already been completed,and according to the narrative 2,800 cubic feet of topsoil <br /> was salvaged. What other excavation work took place in support of constructing <br /> the Reagent Room? <br /> In addition to the topsoil that was removed, bedrock was also excavated. In order to make space for the <br /> Reagent Room to be attached to the existing Mill Building a portion of the hillside needed to be removed. <br /> The work was completed using an excavator. <br /> b. What is the volume of material to be removed? Provide a cross section depicting <br /> undisturbed ground compared to final grades necessary to complete the Reagent <br /> Room as per the engineered plans. <br /> There was approximately 28,350 cubic feet of bedrock removed during the excavation. The bedrock was <br /> placed in the waste rock pile and used for riprop onsite.See cross section in Figure 1. <br /> c. Were any upgradient surface water controls installed to direct water away from <br /> the facility? <br /> Upgradient surface water controls were previously existing and did not need to be constructed. <br /> Storm water Diversion Ditch#1 runs the length of the southern permit boundary and controls all surface <br /> water upgradient of the Revenue Mine site.See attached Environmental Protection Map. <br /> 6 1 P a e <br />