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TR-119 Response Cont. <br />Page 2 of 2 <br /> <br />total of 391.7 acres were included as active in the original model compared to 338.68 acres if all 2018 N - <br />Pit stripping was completed. Also of note is the 2 year growth (CN 67) category at 461.5 acres in the <br />original model compared to 675.57 acres cu rrently with 2018 N-Pit stripping removed. Slopes are also <br />less steep in the proposed stripping areas for N-Pit and should also reduce runoff potential. <br /> <br />The East Pyeatt sediment ponds have the capacity to treat proposed 2018 topsoil stripping within the N-Pit <br />area based on this comparison. Curve number 87 active areas are less than the original model and the 2 <br />year growth areas have increased as much of the watershed within F-Pit to the south of N-Pit has attained <br />Phase II and III bond release. <br /> <br />4. Please provide the acreage of the Haul road expected to be located in the Federal lease. <br /> <br />Trapper Response: Proposed stripping of the Nighthawk Pit haulroad is comprised of previously disturbed <br />and reclaimed Phase III bond released areas. The total proposed acreage of this re-disturbance is 3.3 <br />acres. <br /> <br />5. Please update the submitted revised page 3-16 regarding the sections L Pit Mining and Nighthawk Pit <br />mining, such that there is no supposition that a request for mining is either being requested or approved <br />with this TR. <br /> <br />Trapper Response: See attached revised permit page 3-15a. <br /> <br />6. Please indicate if you anticipate requiring a 200 foot buffer past the lease boundary on the 2018 east <br />stripping line at L pit. <br /> <br />Trapper Response: Proposed 2018 stripping included in TR-119 does not encompass nor surpass the <br />current federal lease boundary. A buffer will not be necessary nor is requested with this revision. <br /> <br />DRMS Comments April 9, 2018 <br /> <br />Please clarify if any additional culverts will be associated with the mentioned road and if <br />so, please provide all necessary information to satisfy rule 4.03.1(4 ). <br /> <br />Trapper Response: The routing of the new Life of Mine haul road on the northern perimeter of Nigh thawk <br />pit is routed in such a way that it follows a ridgeline and no culverts are planned to be used under it at this <br />time. <br /> <br />Please contact me if you have any questions regarding the enclosed information. <br /> <br />Sincerely, <br /> <br /> <br />Graham Roberts <br />Environmental Engineer <br /> <br />GCR [M/Permit Revisions/TR-119 Response1, 2 CL.doc] <br /> <br />c File 109.2.3.4 w/o attachments <br /> Revisions File <br /> <br /> <br /> <br /> <br /> <br />