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<br />Memo to Berhan Keffelew <br />CRESSON Haul Road Thickness <br />page 3 <br />(1) Based upon the 1 " rutting documented by Golder Associates during <br />operations on an evening without rain, I suggest 3" be added to the <br />42" minimum thickness requested by CC&VG to compensate for <br />expected rutting, which reduces the nominal separation of load from <br />liner. Therefore, CC&VG may operate its side-dump trucks on a drain <br />cover fill thickness of 45 inches or more, if it simultaneously <br />adheres to the following additional conditions. <br />(2) If bad weather conditions or material saturation result in rutting in <br />excess of three inches, hauling shall be suspended until conditions <br />improve or until the fill thickness is increased to assure the <br />minimum nominal separation of 42 inches between the load and the <br />liner. <br />(3) When operating on a drain cover fill thickness of less than five feet, <br />loaded side-dump trucks may not complete a turn with a radius of <br />less than their combined tractor and trailer length. After dumping <br />their load, or if operating on a fill thickness in excess of five feet, <br />side-dump trucks may negotiate turns of any radius desired. <br />(4) When operating on a drain cover fill thickness of less than five feet, <br />side-dump trucks shall not complete abrupt braking maneuvers. <br />(5) Side-dump trucks shall not operate under field conditions which <br />cause drive wheel slippage. If moisture has reduced traction, <br />resulting in drive wheel loss of traction, hauling shall be suspended <br />until conditions can be improved to prevent drive wheel slippage. <br />(6) Side-dump trucks shall not operate on haul roads of sufficiently <br />steep gradient to result in drive wheel slippage. Particular care <br />shall be taken to prevent drive wheel slippage when starting loaded <br />side-dump trucks from a standing start on steep gradient haul roads. <br />Temporary haul roads shall be thickened and ramped to reduce <br />gradients if drive wheel slippage is occurring. <br />