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9.22) All maintenance work shall be performed concurrently with use. In addition, at the end of the <br />operating season, maintenance work will be done to minimize damage from adverse weather. Such <br />work shall include final blading to remove ruts and other irregularities that would prevent normal road <br />surface runoff, and a final clearing of drainage ditches and culverts to insure satisfactory functioning of <br />the road drainage system. <br />9.23) Replacement gravel applied to road surface will either be; 1.) Forest Service Specification 'G' for <br />surface course aggregate gradation, or 2.) CDOT class 6 gravel. Either must have a Plasticity index of 2 to <br />9 (AASHTO T90) <br />9.24) Application of approved dust suppressant such as water may be required as directed by the <br />District Engineer to provide adequate dust control to ensure resource protection and road user safety. <br />Page 4 of 4 <br />