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' <br /> Transit Mix Concrete Co. <br /> ultimate extents of the disturbance, and the most conservative values reported in this <br /> document so that the structures only need to be constructed once. Within the pit area, Phase <br /> life structures were designed as needed for that Phase. <br /> Prior to re-grading and revegetation on affected areas, bare cover material surfaces are <br /> potential sources of high sediment loads in the runoff water. As a result, sediment control <br /> measures constitute the major water management control measure for non-reclaimed areas: <br /> • Clean water diversion ditches will minimize contact water volumes. <br /> • Runoff of sediment-laden water from the affected areas are collected on terraces and <br /> routed to sediment basins using down drain ditches. <br /> • Sediment detention basins have fore bays and sediment controlling outlets. <br /> • Best management practices (BMPs) are used for sediment control. <br /> Progressive/contemporaneous reclamation will be employed to reduce the extent of non- <br /> reclaimed areas, thereby reducing erosion and sediment-laden water volumes. <br /> 3. Surface Water <br /> The Quarry is located on the south side of Little Turkey Creek. Little Turkey Creek flows <br /> northwest to southeast adjacent to the proposed Quarry area before flowing southeast under <br /> Highway 115 and into Turkey Creek. Turkey Creek flows south approximately 25 miles and <br /> discharges into the Arkansas River upstream from Pueblo, Colorado. The Little Turkey Creek <br /> watershed extends approximately 5 miles to the west of the project area with a maximum <br /> elevation of 10132' msl, and the watershed is approximately 5.9 square miles. Little Turkey <br /> Creek flows intermittently under Highway 115 at an elevation of approximately 6500' msl. <br /> The proposed Quarry was designed to minimize impacts to Little Turkey Creek. No mining <br /> will occur within 100 feet of the centerline of the creek, and the floor of the mining area will <br /> remain at least 10 feet above the creek thalweg at all times. The area between the edge of <br /> the pit and the stream will drain toward the creek to minimize any impact from the pit. The <br /> affected area will drain toward the pit and sediment basins within the pit area. One crossing of <br /> Little Turkey Creek along the access road and establishing reclamation drainage and <br /> drainage connections in the plant area are the only proposed disturbances to the creek within <br /> the 100-foot buffer. The creek crossing along the site access road is approximately 1,500 <br /> feet from Highway 115. Little Turkey Creek Road will not be crossed by any mining <br /> operations. The creek crossing design is discussed in Section 4c. The reclamation drainage <br /> is discussed in Exhibit E and in Section 4a. <br /> a. Surface Water Flow Information <br /> Norwest Corporation (Norwest) established surface water monitoring stations on behalf of <br /> Transit Mix. LTC-1 was installed in June 2015 and measures flow conditions downstream from <br /> the proposed mining area. The LTC-1 station is located approximately 1.5 miles upstream from <br /> Hitch Rack Ranch Quarry Permit Application <br /> March 9, 2018 G-4 <br />