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FP,U1 BRLRZ o ASSO~:HTc= INS • FRX h70. : 970 253 9736 • Feb. 23 2001 02:32PM P3 <br />Mr. Gregg Syuire <br />Yage 2 <br />February 2 L, 2001 <br />feet beyond the upstream edge of weir to protect that edge from erosion. The reclamation bond <br />estimate submitted with the 1 l2 permit application assumed that 15,000 cu. yd. of material would <br />be moved and 1.05 acres would need revegetation. fhis appears to be adequate to reclaim the <br />RRA. <br />Item 2 -Reclamation of pit slopes. The operator intends on placing fill material in two phases to <br />achieve the post mining slopes of 3:1 and 2:1. The first (dry) phase is the placing of material on a <br />3:1 slope from the pit crest to the top of the dry bench. "fhe second (wet) phase involves leaving <br />material in place below the ground water level to achieve the design post mining slopes. This <br />effort is part of a cvntentporaneous reclamation process. <br />Additional detail on the reclamation ofthe pits is included in Items 1 and 3 of our December 21, <br />2000 response to Mr. Tom Schreiaer's review cotntrtents. <br />Item 3 - Return of Renewable Resource Area (RRA} to acceptable and stable condition annually. <br />The pit slopes ut RRA will he brzadcd to a 3:1 slope as part of muting per the detail supplied in <br />response to Mr. Allen Sorenson's review comments. <br />it is anticipated that the mazerial mined from tits RRA will be hauled to a pit that contains in pit <br />crushing and screening facilities for processing. Depending on the area available in the pi[ with <br />the crushing and screening facilities to dry out wet pit run material, it is possible that mined <br />material may be stockpiled in the renewable resource area to dry out prior to being hauled to <br />another location for processing or sale. These materials will be removed from the Renewable <br />Resource Area prior to cessation of mining for that specific year. <br />The operator intends on constructing a weir on the discharge end of the RRA to control flows <br />exiting the RRA during runoff and to keep out ]ow flows during mining. Due to the cost to <br />construct the weir, the operator intends on leaving the structure in place until mining permanently <br />ceases in the RRA. At that time, the weir will be removed as part of reclamation. <br />Item 4 -Annual river channel baseline and cross sectional surveys. The operator has committed <br />to performing channel cross sectional surveys for the RRA only in previous responses to DMG. <br />For the main river chatnteL the operator will perform visual inspections of the main river hank <br />adjacent to active pits. The inspections wt11 assess whether any changes have occurred, ifthese <br />changes are natursl or minim related, and if m'^in9 related, contact DMG to discuss what if any <br />mitigation may be required. The river bank inspection report will be subatitted with the annual <br />report to DMG. <br />item 5 -Assessment of potential upstream and downstream impacts due to flooding of the pits. <br />The operator is currently performing a 100 yeaz floodplain study for the RRA and the azeas <br />imtnediately upstream and downutream from the RRA. This study is expected to assess the Flood <br />stage that overtops the exisring river banks, flow velocities along the river truss sections used in <br />the study, Flood stage fur both the 50 and 100 year flows. The study will use the following <br />scenarios to assess potential impacts for the RRA, Dry Creek, slough to east property line and <br />west property line to horse fence mining areas: <br /> <br />