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With the completion of the Colorado Cooperative Company's main irrigation ditch in about <br />1905, most of the surface deposits (soils) have been intensively modified by both cultivation and <br />irrigation water. The 2nd Park Lateral irrigation ditch runs along a ridge line that is the stream <br />divide between Tuttle Draw and Coal Canyon, (see Map 2.04.7-1). The NHN permit area <br />consists of 316 acres (not including the narrow equipment haulage corridor). About 117 acres of <br />the permit area located to the south of the 2nd Park Lateral drains into Tuttle Draw. The 199 acres <br />of the permit north of the 2nd Park Lateral drains into tributaries of Coal Creek Canyon. <br />The total drainage basin of Tuttle Draw is about 16 square miles. The total drainage basin of <br />Coal Canyon is significantly larger; however, that portion of the Coal Canyon basin affected by <br />the permit area is relatively small. This area is mostly drained by Meehan Draw (see Map <br />2.04.7-1) and including the water shed within the permit area (199 acres) is only about 353 acres. <br />The permit area and upstream watershed is mostly composed of irrigated crop (hay) and pastures <br />with small "islands " of un -irrigated rangeland that are located above ditch banks or otherwise <br />isolated from the irrigation system. The area south of the 2nd Park Lateral (about 117 acres) <br />drains through the area of old Peabody Nucla Mine, portions of which have been reclaimed (post <br />SMCRA). The main drainage (see Map 2.04.7-1, Nygren Draw) to the south into Tuttle Draw <br />has a gradient of about 151 ft/mi. To the south, the maximum topographic relief located along <br />the old Peabody Nucla Mine reclaimed high -wall is about 40 ft. To the north of the 2nd Park <br />Lateral, Meehan Draw has a gradient across the permit area of 158 ft/mi. with a maximum <br />topographic relief of about 45 ft. South of the 2nd Park ditch, the maximum topographic <br />elevation is about 5775 ft msl and the minimum is about 5680 ft msl. North of the ditch the <br />highest elevation is about 5790 msl and the lowest elevation is 5665 ft msl. <br />Surface Water Monitoring NHN added 21 new surface water monitoring stations in the permit <br />area to supplement existing baseline data. Map 2.04.7-1 show the locations of the new stations <br />(numbered SW -N200 through SW -N218 and SW -N1 and SW -N3) as well as the locations of the <br />surface water stations that were monitored by Peabody, that have been discontinued. Baseline <br />monitoring of the new stations began in October 2008 consisting of monthly instantaneous flow <br />measurements and field parameters (pH, water temperature, and conductivity), when the sites <br />had flow and collecting bi-monthly water quality samples, when sites had flow. Surface water <br />monitoring station SW -N206 was destroyed when the County replaced the culvert (site of <br />station) under 26.50 Road in 2009. Currently, of the 21 surface water monitoring stations <br />referenced above, 15 are active, 3 are abandoned, and 3 have had monitoring suspended, as <br />indicated on Map 2.04.7-1. The surface water monitoring data is contained in Appendix 2.04.7-2 <br />of this permit application. <br />Coal Canyon (aka Coal Creek Canyon and Coal Creek) is located to the north and west of the <br />permit area (see Map 2.04.5-1). In the upper reaches it is dry except during periods of snow melt <br />run off and heavy precipitation events. Immediately north of the terminus of the 2nd Park Lateral <br />Section 2.04.7 Page 20 April 2016 (PR -01) <br />