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4.05.2. Additional surface water monitoring, which had previously been <br />required, was terminated in 1997 pursuant to TR-47. <br />The Division has reviewed the surface and ground water monitoring plans as, part <br />of the revision process. These monitoring plans are adequate to monitor for the <br />development of impacts, if any should develop. The 2007 Annual Report <br />stipulated existing water monitoring well 294M as the groundwater point of <br />compliance. <br />E. Stream Buffer Zones <br />The Division approved underground mining activities within 100 feet of a <br />perennial stream with a biological community. This decision was based on a <br />finding that the original stream channel will not be affected, water quality and <br />quantity will not be adversely affected as a result of the disturbance, and <br />appropriate riparian vegetation will be reestablished upon final reclamation. <br />The buffer zone variance is granted for the raw water lagoon and dike along <br />the White River, at the mouth of Scullion Gulch. A riparian revegetation <br />plan is provided in Section V. 1.4h of Volume IV of the permit application <br />(4.05.18(1). <br />F. Probable Hydrologic Consequences <br />The probable hydrologic consequences of mining within the Deserado Permit <br />Area are addressed within Section II.C.5 of Volume I of the permit application. <br />The permittee's statement of hydrologic effects has been reviewed by the Division <br />for compliance with Rule 4.05.1 and 2.05.6(3). <br />1. Surface Water Impacts <br />Small short-term surface water losses will occur as a result of two factors; <br />retention of water in ponds and removal of water from the White River <br />lagoon. Runoff from disturbed areas will be routed through sedimentation <br />ponds, thereby reducing the amount of flow to the White River. Evaporation <br />losses will occur, as the ponds will not discharge runoff until the point of <br />available storage volume is achieved. Clay subsoils, which comprise the <br />bottom of the sedimentation ponds, will allow very little impounded water to <br />re-enter the ground water system. Losses from the D-Portal pond will be <br />insignificant when compared to total runoff from the Scullion Gulch <br />watershed. Scullion Gulch has a contributing drainage area of 7,552 acres at <br />its confluence with the White River, with the D-Portal pond designed to store <br />runoff from only 44 of the acres. The refuse disposal area ponds are designed <br />to receive runoff from approximately 98 acres, which is a small portion of the <br />2,950 acres drained by the Red Wash tributary through the northern section of <br />the permit area. Based on the above information, the net loss of surface water <br />quantity to Red Wash and the White River will be negligible. <br />Deserado Mine 21 September 19, 2008