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<br />essary revegetation, the minimum allowable top width of river- <br />side berms will be 400 feet. This is the extreme case in terms <br />of setback requirements imposed on gravel mining operators. It <br />is, however, also the least costly measure in terms of cani*_al <br />expenditures. <br />When the river is maintained in its existing unstable alignment <br />and the riverbank is protected in accordance with the require- <br />ments of Section 2.3 - Riverbank Protection the minimum allow- <br />able top width for the riverside berm will be 250 feet. <br />When the river is left in its existing unstable alignment and <br />no river bank protection is provided, but pitside slope protec- <br />tion is provided in accordance with the requirements of Section <br />2.4 - Pitside Bank Protection, the allowable minimum top width <br />will be 300 feet. <br />when the river is maintained in its existing unstable alignment <br />and protection is provided for both the river bank and the pit- <br />side slope in accordance with Sections 2.3 - Riverbank Protec- <br />tion and 2,4 - Pitside Bank Protection, the allowable minimum <br />top width of the riverside berm will be 150 feet. <br />2.6.2 Master Plan Alignment and Minimum Maintenance Alignment <br />The Master Plan alignment and the minimtun maintenance alignment <br />are two cases in which the alignment of the river is predeter- <br />mined and riverside bank stabilization is provided. The Master <br />Plan alignment is a modification of the minimum maintenance <br />alignment and attempts to reconcile not only the geometric re- <br />quirements but also property line constraints and constraints <br />imposed by the existing river alignment. <br />UDSFCD GRAVEL GUIDELINES 12/17/87 <br />2-29 <br />