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-20- <br />~~ IX. -Probable Hydrologic Consequences and Cumulative Imuacts Assessment - <br />For the same reasons water quality is mast Salt CreeF: will be minimally <br />affected. Because the surface disturbance will consist primarily of road <br />and portal development most of the impact will consist of an increase in <br />suspended sediment concentrations. The sedimentation ponds are designed <br />to reduce the sediment concentration to acceptable levels before release <br />into the streams. <br />No waste disposal areas will be developed for the :fcClane Canyon operation. <br />There is a waste disposal area planned for :Suger Canyon. The material to <br />be produced by both operations has not been completely analyzed. Prior <br />to the development of the waste pile the material to be disposed of will <br />be completely analyzed to determine whether any special handling or remedial <br />treatment will be necessary. If ehe..ical elements are detected at <br />concentrations which, upon contact with surface runoff, could degrede <br />the quality of the water the special handling or remedial treatment measures <br />would prevent or minimize such an impact. Such measures will be identified <br />in the ifunger Canyon Findings of CompL•'ance. <br />The Plunger Canyon operation will mine the same coal zone as the McClane,Canyon <br />mine. For the First permit term (during which both dines will probably <br />operate contemporaneously) the plunger operation will not advance into the <br />zone of saturation which vas projected by the applicant on the basis of <br />drill hole information. Neither mine will have a significant impact on the <br />nature of ground eater during the first permit term. There will be no <br />cumulative effect on any aquifers of regional extent as a result of mining <br />at these location. <br />The projected development of the McClane Canyon and `funger Canyon Mine <br />workings indicates further impact on ground and surface water in the future. <br />Munger Creek, Bunigez Canyon, Stove Canyon and a portion of the East Salt <br />Creek valley floor will be undermined. Prior to issuance of a permit to mine <br />into these areas it will be necessary to determine the absence or presence <br />of AVF`s in these canyons, and to predict the effect of mining on any AVF's <br />identified. These determinations will occur in furore permit applications. <br />Mining will progress into the projected saturated zone of the coal interval <br />in future permit terms. The recharge area of the Cameo seam at East Salt <br />Creek will also be impacted. In subsequent permits geologic and alluvial <br />monitoring sites will have to be established to adequately monitor the effect <br />of mining on geologic and alluvial ground water quantity and quality. <br />After mining is completed for these operations all portals will be sealed <br />and disturbances will be backfilled, graded, topsoiled and revegetated. In <br />this reclaimed situation [he hydrologic characteristics of the disturbed <br />areas will be restored to nearly pre-mining conditions. <br />The assessment of the probable cumulative impacts of all anticipated coal <br />mining in the general area on the hydrologic balance, as described in <br />2.05.6(3), has been made by the Division, and the operations proposed under <br />~'1 the application have been designed to prevent damage to the hydrologic <br />balance outside *_he nronosed perr.,it area. <br />