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' <br /> - 6 - <br />' <br /> The road has been provided with drains at the natural <br /> drainageways. If erosion continues to be a problem small <br /> erosion control drops should be provided along the interior <br /> drainage ditch to reduce erosive velocities. Riprap p.rotec- <br />' tion should be provided at areas where there is now an <br /> indication of erosion. <br />' 1975 through about 1990 Facilities <br />' As mentioned previously, an access road is to be con- <br />t <br />d <br />G <br />ill <br />bi <br />S <br />i <br />l <br />h <br />hi <br />h <br />i <br /> s <br />ructe <br />across <br />n <br />w <br />serve a com <br />nat <br />on <br />tra <br />u <br />c <br />c <br />w <br /> purpose of material stockpile and access to the south quarry <br />i , area. The 66 inch/72 inch drainage pipe will pass beneath this <br /> access road and an inlet will be constructed on the upstream <br />' side. The pond formed by the access road across the Gulch kill <br /> serve as a sedimentation pond and an inlet is to be provided <br />' into the drainage pipe. Under the conditions of major flood <br /> flow this pipe is adequate to convey the 100-year runoff within <br />' the pipe and there will be no overland flow from the upper <br />St <br />i <br />G <br />l <br />h <br />th <br />h th <br />i <br />Fi <br />2 i <br />h <br /> ra <br />n <br />u <br />c <br />reac <br />roug <br />e operat <br />ng area. <br />gure <br />s a <br />es <br /> section through the access road embankment showing a schematic <br />' inlet design. If debris becomes a major problem, a debris <br /> collector or trash rack may be constructed around the inlet. <br /> Since this facility will only be in place during a portion of <br /> the mining operation, maintenance by Cooley Gravel Company will <br /> be provided. Large boulders are shown placed in front of the <br /> inlet to act as a debris deflector. A low dike of smaller <br />' rocks surrounds the inlet to provide sedimentation ponding. <br /> Periodic maintenance will be required to keep sediment from <br /> accumulating behind the dike. <br />' <br /> It is desirable that as much drainage as possible from <br />' the mining area be routed into the pool behind the access road <br />to allow s <br />ttlem <br />f <br />t <br />i <br />di <br />t <br />i <br />t <br />t <br />i <br />th <br />d <br /> e <br />en <br />se <br />men <br />o <br />pr <br />or <br />er <br />ng <br />ra <br />nage <br />o en <br />e <br /> system. Runoff from the open cuts formed by the mining opera- <br />' tion will cause erosion. This material should be allowed to <br /> <br />t /~l leoaard Rice Consulu.^.~ Water Eeq ~.eers Inc `~ ~ _~ y <br />