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Grantl River Park Project, M-2006-046 <br />Response to Adequacy Letter of August 1, 2006 <br />6 September 2006 <br />Page 4 <br />C-2. Further detail regarding reclamation procedures is provided in response to <br />adequacy questions below. <br />With the exception of berming and initial set-up as described above, stockpiling <br />of salvaged material will not be necessary due to concurrent reclamation. <br />Generally, the site is covered by little to no overburden, and, upon <br />commencement of concurrent reclamation, any topsoil or substrate encountered <br />during the mining of the site will have immediate application in the establishment <br />of final side slopes and other topographic features in the reclamation plan. <br />7. The applicant states that the operator will mine the property to create <br />average slopes of 2.5H:1V. However, the applicant also states that the <br />operator may mine to near vertical slopes if sufficient overburden is <br />available for backfilling of near vertical slopes. The Division recommends <br />that the operator commit to mining to 2.5H:1 V,' otherwise, the bond <br />calculation will be have to be based on assuming near vertical slopes that <br />have to be backfilled, which will increase the required bond. Please <br />respond. <br />It is believed that limited backfill opportunities will require the applicant to mine to <br />slopes approximating the grades for final reclamation. From this standpoint, it is <br />reasonable to expect that the operator will mine to 2.5H:1V or shallower slopes <br />across most of the site. However, as the Division has noted regarding the <br />application, flexibility to recover additional material within the side slope is <br />desired if backfill material is readily available for concurrent reclamation. The <br />desired flexibility would not result in a scenario where the entire shoreline of the <br />five separate mining cells would be mined to near-vertical condition at the same <br />time. Given identification of available backfill resources and appropriate <br />concurrent mining and reclamation technique, it is possible to recover materials <br />to near-vertical slopes while leaving a maximum of no more than 1,000 linear feet <br />in this condition at any one time. For bonding purposes, this potential for an <br />increase in efficiency of recovery of construction materials does not present a <br />great deal of additional cost in the event of a default. <br />8. In accordance with Rule 6.4.4(c), please describe how water draining from <br />excavated maferial will be diverted and/or impounded fo protect against <br />off-site impacts. <br />With reference to page 10 of Exhibit D, describing the technique of allowing wet <br />pit run to drain in temporary piles immediately outside the excavated area, it is <br />not necessary to provide for any diversion or impoundment within the meaning of <br />Rule 6.4.4(c). Rs the above question references impacts related to water, <br />