Laserfiche WebLink
-11- <br />C~ <br />relatively thin layers with sheepsfoot rollers, small <br />compactors and other relatively light equipment. With the <br />type of hauling equipment available, we anticipate that <br />considerable compaction can be achieved by routing the <br />loaded haul trucks over the surface of the fill. Using <br />haul equipment for compaction it is essential that the <br />entire layer be covered by the wheels of the haul trucks. <br />This will require some control and supervision during com- <br />paction. <br />8. We recommend that density tests be made during the placement <br />process as the fills are brought up in order to confirm that <br />adequate densities are being achieved. In order to determine <br />the optimum lift thickness, it will be necessary to observe <br />the compaction process and make frequent tests in order to <br />develop an optimum relationship between compactive effort <br />and layer thickness. If very large stones occur in the fill, <br />it may be desirable to use a grid roller to break down the <br />rougher portions of the spoil. Heavily loaded grid rollers <br />make an excellent compaction device when it is desired to <br />break down sedimentary rock. <br />• SETTLEMENT ANALYSIS <br />A portion of Haul Road 'D' will be underlain by relatively soft <br />clays to depths up to as much as 18 feet. Several consolidation tests <br />were made as part of our investigation for the earth dam, which will be <br />located immediately uphill of the proposed haul road. In the area of <br />haul road construction, we recommend that all organic materials near the <br />surface in this area be stripped. We anticipate it may be necessary to <br />strip as much as 18 inches, for the portion of haul road immediately <br />downstream of the proposed earth dam. Relatively moist conditions may <br />be encountered in this area. We recommend that the initial layer of <br />fill be constructed by placing approximately 36 inches of spoil preferably <br />sandstone, across the base of the proposed haul road embankment. Sand- <br />• stone spoil will be a relatively permeable material and will allow drain- <br />age of the lower, more compressible clay and allow consolidation to occur <br />