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2.05 APPLICATION FOR PERMIT FOR SURFACE OR UNDERGROUND MINING ACTIVITIES-- <br />MINIMUbl REQUIREMENTS FOR OPERATION AND RECLAMATION PLANS. <br />. 2.05.6 Mitigation of Surface Coal Miaing Operation Impacts. (Cont'd.) <br />(3) (b) (iii) (Cont'd.) <br />A stilling well and recorder were also installed on an existing <br />24-inch Parshall flume in the Roberts Stucker Ditch. This stream <br />gauge, SW-12, is located near SW-11 in the NNri/< Sec. 35, T13S, R92W, <br />of the 6th P,M.. <br />In addition to continuously recording stream gauges, Watec, Inc. <br />installed crest stage gauges and sediment samplers in the three small <br />ephemeral drainages within the permit and adjacent areas. Monthly <br />high flows were measured and sediment samples obtained from these <br />monitoring stations These stations are located near the Morrell Cow <br />Camp in the NWY< NE'/<, Sec. 1, T135, R92W, of the 6th P.M. (SW-4), in <br />Coal Gulch in the SW`/<, SW~/., Sec. 17, T13S, R91W, of the 6th P.M. <br />(SW-8), and in the SE'/4, NWY<, Sec. 19, T13S, R91W, of the 6th P.M. <br />(sw-7). <br />Ten ponds numbered 81 through 90 were also chosen for monitoring <br />during each month during 1983 and 1984 to ascertain baseline data for <br />the entire permit area. Discharge, pond size, and field parameters <br />were measured monthly and samples taken for laboratory analysis each <br />quarter. Locations of these ponds are shown on Map No. 4-1. <br />A significant reduction in the water hydrology monitoring grogram was <br />addressed by the operator through TR-24 (1994.) The operator <br />evaluated the current five-year mine plan and considered the <br />• extensive data previously collected for monitored locations in <br />petitioning the Division to reduce the intensity of the ongoing <br />hydrology monitoring program. The operator evaluated previously <br />collected data and determined that the potential for significant mine <br />impacts to adversely effect ponds is low. Selected ponds were <br />eliminated from the monitoring program as no potential impacts could <br />reasonably be projected to occur given the current mine plan. <br />Monitoring frequencies were reduced at remaining ponds within the <br />potential zone of subsidence impacts. <br />Present Surface Water Monitoring - Permit and Adiacent Area <br />As a result of discussions with the BLM and CMLRD during previous <br />revision application reviews, the operator redesigned the surface <br />water monitoring program to include the projected five-year mine plan <br />affected area and adjudicated water rights within the permit area. <br />Because of past, higher production rates, a majority of the permit <br />area was included in the five-year mine plan area. The operator has <br />no current projections in the five-year mine plan within the permit <br />area and hydrologic monitoring is now limited to the areas which will <br />be affected by reclamation and the continued operation of the Unit <br />Train loadout. <br />Another significant reduction in the water hydrology monitoring <br />program was addressed by the operator through TR-34. The operator <br />evaluated the current five-year mine plan and considered the <br />extensive data previously collected from monitored locations in <br />petitioning the Division to reduce the intensity of the ongoing <br />hydrology monitoring program. The operator evaluated previously <br />collected data and determined that the potential for signi£ic ant mine <br />impacts to adversely effect ponds is low. <br />TR 36 Revised 7/31/2001 <br />APP~eovE p 118 <br />a/~~o ~ <br />