2019-03-18_PERMIT FILE - M2018016 (9)

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open water or developed water resource would require the Operator to submit an amendment to the permit pursuant with Rule 1.10. Please commit to submitting and receiving Division approval of an amendment prior to exposing groundwater at the site. Any post mine land use change will necessitate an amendment to the permit, which the operator will apply for. 23. Please provide a description of the nature of the stratum immediately beneath the material to be mined in sedimentary deposits pursuant to Rule 6.4.4()9(ii) in the Mining Plan or on the Exhibit C maps. See the revised Exhibit D. 24. On Page D-5, the Applicant states a portable wash plant recycle pond will be included in the site facilities. Please provide a description of the design and operation of the recycle ponds. The ponds associated with a portable wash plant are used to recycle wash water for use in the plant repeated times. These ponds are a sequence of small sediment ponds that allow wash water to drop out fine sediment from washing prior to that water being pumped back into the wash plant for re-use. The sediment and fines in these ponds will be cleaned out periodically and placed with other reject material from processing for use as backfill. These ponds are small, typically 10' x 20' x 3' at most. They will vary in size depending on production needs; more washed rock will necessitate larger ponds. 25. On Page D-5, the Applicant states all fuel tanks will have secondary containment...with over 110%of the volume of the largest tank. Please commit to constructing and maintaining secondary containment for 110%of the volume all tanks in the containment facility, not only the volume of the largest tank. See revised Exhibit D. A detailed SPCC plan will be maintained for the site. 26. On Page D-5, the Applicant indicates all fuel tanks will have secondary containment. Please provide the construction and maintenance details for the containmentfacilities. Containment will consist of double-walled tanks and/or lined berms with appropriate capacity. 27. On Page D-6, the Applicant states a designated equipment repair area with two foot thick compacted pad offines with a further six inches ofgravel placed atop will be constructed. Please clarify if the repair area will include a sump to collect any released toxic materials. Please provide design and operation details for the sump ifplanned for construction. A sump will be maintained in the described maintenance area to trap any spilled oil or grease. Periodically this sump will be cleaned out, and any material with oil or grease amongst it will be disposed off offsite at the appropriate landfill. 28. On Page D-7, the Applicant states past mining activity predicts an expected 12 inch average depth of topsoil. Please describe and indicate the location of the previous mining activity at the site on the Exhibit C maps. See the revised Exhibit D. DAIR Mine AM-01 6 Gny I ieicAi and lrorialr PI I