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Response to DRMS Adequacy Review (1) — Cotter JD -9 Mine Reclamation Plan Amendment <br />Basin member overlying the Salt Wash memberat the JD -9 site. At this <br />concentration, water entering the Salt Wash sandstone below the pile would be <br />higher quality water than ambient conditions based on water quality data from <br />the monitoring well. <br />30. Addressing Rule 6.4.21(14), SPLP tests were conducted in order to characterize the <br />waste rock generated at this site. According to this rule, the ore must also be <br />characterized. Please submit to the Division, a geochemical evaluation of the ore to be <br />mined. Alternatively, if ore samples are not available at this time, commit to submitting <br />this information to the Division, for review and approval, prior to any stockpiling on the <br />surface. <br />Prior to ore being stockpiled on the surface, Cotter will submit to DRMS a <br />geochemical evaluation of the ore to be mined for its review and approval. <br />31. Addressing Rule 6.4.21(16), on page U -20, the EPP states that design and <br />implementation of the Drainage Design Plan will be overseen by a registered <br />professional engineer. Please commit to submitting an "As Built Certification" to the <br />Division following construction. <br />Cotter will submit an "As- Built- Certification" to the Division following the <br />construction of the Drainage Design Plan facilities. <br />32. Addressing Rule 6.4.21(16), on page U -20, the EPP states that Cotter Corp. will conduct <br />regular inspections of all structures. Please inform the Division of the anticipated <br />minimum inspection frequency interval. <br />Cotter will at a minimum inspect all structures once per week when the mine is <br />active and once per month when the mine is not actively involved in mining <br />operations. <br />10 <br />