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THE WRITTEN NOTIFICATION REQUESTING AUTHORIZATION UNDER THE RGP <br />SHOULD BE SENT TO THE WESTERN COLORADO REGULATORY OFFICE, U.S. <br />ARMY CORPS OF ENGINEERS, SACRAMENTO DISTRICT, 402 ROOD AVENUE, <br />ROOM 142, GRAND JUNCTION, COLORADO 81501-2563. THE TELEPHONE <br />NUMBER IS (303) 243-1199. <br />Within two weeks of receiving notification, the Western Colorado <br />Regulatory Office will review the proposal and notify the <br />applicant, normally in writing, if the work may proceed under the <br />authorization given in this RPG. If consultation with the Fish <br />and Wildlife Service on the effects to threatened and endangered <br />species is necessary, then a decision by the Corps of Engineers <br />will be delayed until the consultation is completed. An <br />applicant may not proceed with work until notified by the Corps <br />of Engineers. <br />SCOPE OF WORK: Tt~e following discharges are authorized by this <br />regional general permit: <br />1. RIPRAF. Riprap is material placed along an eroding bank <br />to armor it and reduce erosion. Riprap material must be durable <br />angular rock or broken concrete free from large quantities of <br />organic material and Prodable material such as dirt and gravel. <br />Rounded river cobble or stone is not acceptable as riprap and is <br />not. authorized under this RPG. Properly anchored trees and logs <br />oiay be used in combination with large rock riprap. Proper <br />anchoring of trees and logs is especially important because <br />floatable materials can dislodge and move with currents <br />• potentially causing downstream erosion and blockages. <br />The placement of riprap is authorized provided: <br />(a) A single and complete bank riprapping activity is <br />less than 1000 feet in length along a atreambank; <br />(b) The riprapping is limited to less than an average <br />of two cubic yards of material per running foot placed below the <br />plane of the ordinary high water mark of the stream; <br />(c) The size of the riprap shall be large enough to <br />withstand expected high flow velocities and turbulences to <br />prevent ttie riprap from dislodging. If concrete chunks are used, <br />all exposed rebar or other degradable substances shall be removed <br />prior to placement. Large concrete slabs shall be broken into <br />cF~unks prior to placement Lo prevent slabs from being carried <br />away by h]gh flows; <br />(d) The maximum slope steepness for riprap <br />installation should be one foot vertical for 2 feet horizontal; <br />• <br />3 <br />