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(e)(2j Bie Game Winter Ranee. If areas are determined by the Colorado Division of Wildlife (CDOW i to be mule deer and elk crucial winter range. the following stipulation shall be applied: a) Coal related facilities and surface disturbance, except subsidence, will be authorized in the review area only if no practical alternatives exist. The BLM and USFS will coordinate with the CDOR' [o determine the type and extent of allowable variances. Coal exploration. facility construction, and major scheduled maintenance will not be authorized within crucial winter ranges from December 1 through April 30. All unavoidable surface disturbances within Che crucial winter ranges during these times wilt require approval of the BLM and USFS authorized officer. (f) Riparian Zones. Riparian zones are present within the review area and are suitable for coal leasing only with inclusion of the following special stipulations to protect resident and migratory bird species: a) A I/8 mile buffer zone (660 ft.) will be protected on either side of Raven Gulch (or a buffer zone may be established in accordance with the surface management agency guidelines). No surface disturbances, except surface subsidence, will be permitted within these buffer zones unless no practical altematives exist. All unavoidable surface disturbances will require approval of the USFS or BLM authorized officer. The BLM or USFS will coordinate with the USFWS and CDOW to determine the type and extent of allowable variances. A site specific analysis will determine if [his stipulation will apply. (g) Subsidence. (1) Except at specifically approved locations, mining that would cause subsidence will not be allowed under Raven Creek or within a buffer zone defined by projecting a 25 degree angle of draw (from vertical) from the surface expression of the creek down to the top of the coal seam to be mined. (2) If subsidence activates a landslide, which adversely affects surface resources, or a documented water loss, the operator/lessee shall (where applicable): restore sffeam channels and surface drainage or protect stream flow with earthwork or temporary culverts; or re-vegetate, as necessary, to protect against erosion; or provide other mitigation (which could include water replacement). (h) TopoeraphV. (1) The operator/lessee shall secure adequate baseline data to quantify the existing surface resources on and adjacent to the lease area. Existing data may be used if such data is adequate for the intended purposes. The study shall be adequate to locate, quantify, and demonstrate the inter- relationship of the topography, geology, surface hydrology, vegetation and wildlife. Baseline data will be established so that future programs of observation can be incorporated at regular intervals for comparison. (2) The operator/lessee shall establish a monitoring system to quantify the progressive and final effects of underground mining activities on the topographic surface, underground and surface hydrology, and vegetation. The monitoring system shall utilize techniques that will provide a continuing record of change over time. The monitoring shall incorporate and be an extension of [he baseline data. (3) No surface occupancy or use would be allowed on LBA tract lands defined as wetlands by the U.S. Army Corp of Engineers regulations and guidelines. Stipulations Applicable to the National Forest Svstem Lands: (i) Standard Stipulation for Department of Agriculture Lands. Attached to and made a part of the coal ]ease.