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1 <br />' throughout the mining operation. It should be noted that little <br />' sedimentation has occurred since the construction of the ponds. <br />The lack of sediment accumulation is due to the high permeability <br />' and infiltration rates of the soils and tailings and the lack of <br />' any significant watershed within, or contributory to the area. <br />In the past the only surface runoff has been from water used in <br />' the mining operation from the Columbia ditch. The ditch now <br />terminates at the lowest road terminus of the Valley of the Sun <br />' subdivision and water from the ditch enters a drop structure., <br />(photos ~c^ and ^c3) at this point and from the drop structure,, <br />gravity flows overland to previously mined areas. Presently this. <br />overland flow would be to the dredge site at the north end of <br />Phaco_I~_trench ^c. When trench 3 of Phase I is reclaimed there <br />' will be a ridgeback remaining along the east boundary. 'This <br />' ridge will slope at ~ horizontal to 1 vertical toward the west <br />for about 15~? feet and then blend into the reclaimed landform <br />' which is sloping at about 45:1 (sheet ~ of 4). <br />The e~:isting drainage along, and just outside, the east~~ <br />' boundary of the permit area will be made continuous in the same . <br />location as it now e::ists when Phase II is reclaimed. ~ The <br />' necessity for this drainage is to allow the tailwaters from the <br />Columbia ditch an e;zit. The ditch has been almost totally <br />obliterated south of the drop structure (outside of the permit <br />area and off the property) due to the construction that has ta4:en ' <br />•'place in the Valley of the Sun subdivision. In so establishing <br />the drainage for the Columbia ditch during the reclamation phase, <br />' state and federal laws for water rights and water quality will be <br />q <br />