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Page 5 <br /> Mr. Rob Zuber <br /> June 3, 2022 <br /> 21) Please add additional text to Exhibit E explaining the process to backfill and compact the <br /> mined slopes to the reclaimed 3:1 slope. This explanation should include the type of <br /> equipment used. The text should state that their construction methods will insure stability <br /> of the slopes. The following text has been included in subsection c, "Mining will occur at a 3:1 <br /> slope. Reclaimed slopes in the water storage reservoir will not be steeper than a 3:1 ratio and will <br /> be shaped by a bulldozer to remove rills caused by precipitation. Any gaps in the slope will be filled <br /> with fill materials and construction methods that will insure stability." <br /> 6.4.6 Exhibit F-Reclamation Plan Map <br /> 22) Please add additional information to the legend, indicating what all of the symbols on the <br /> map represent. Missing symbols have been added to the legend. A notation has been added to the <br /> Siltation Pond that only half of the pond will be used at a time. <br /> 6.4.7 Exhibit G-Water Information <br /> 23) On Page 1 of Exhibit G, the Applicant states stormwater collected in the active mine area <br /> will be managed through the dewatering system. Please provide a design of the system and <br /> a description of the operation of this system. Dewatering will be accomplished by digging a sump, <br /> generally along the base of the mine slope,which will hold a floating pump. The pump will have an <br /> HDPE discharge line that will be routed to one of the comingled discharge points located at the site. <br /> The pump will be powered by a diesel generator housed in the active mine area. The Operator will <br /> apply for and receive a comingled stormwater and process water discharge permit prior to <br /> dewatering at the site. <br /> 24)The Applicant needs to provide a general description of the hydrology (surface water bodies <br /> and aquifers)in the vicinity of the site, as well as related structures and activities that <br /> impact the hydrology. This should include a discussion of local aquifers, nearby wells, the <br /> river, ditches, ponds, and irrigation practices. This has been included in the attached Groundwater <br /> Monitoring Plan. <br /> 25)The Applicant needs to provide a report analyzing groundwater conditions after slurry wall <br /> construction. This report must include the methodology used to forecast groundwater <br /> mounding and shadow impacts of the slurry walls. The analyses should entail groundwater <br /> modeling or a similarly rigorous method of analysis. The report must also include a detailed <br /> discussion of the results of the analyses. MMMA stipulates to completing a groundwater model and to <br /> provide the results for review to the Division prior to slurry wall construction. <br /> 26) Please provide a water monitoring plan to assess future impacts of the mining operations <br /> on local groundwater wells. This has been included in the attached Groundwater Monitoring Plan. <br /> 27) Please change"NPDES" to"CDPS" to reflect the requirements of the Water Quality Control <br /> Commission. This has been changed, see the attached Exhibit G. <br /> 6.4.12 Exhibit L-Reclamation Costs <br /> 28)The Applicant should provide more detail on structures, including details on dimensions and <br /> types of construction. The drying and screening building will be a metal sided building with a <br /> reinforced concrete pad approximately 250' by 50'.The wash plant will be portable and will sit on 1 <br /> foot reinforced concrete pad. The scale will sit on concrete footers. The scale house will be a <br /> portable modular unit without a foundation. Two 12 foot diameter silos will be located at the drying <br /> and screening building load out which will sit on 1 and %foot foundations. All other buildings that <br />