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N." <br /> Spiess Rancho Subdivision <br /> Page No. 8 <br /> added to each layer by sprinkling and the soil disced, <br /> harrowed, or otherwise manipulated after the water is <br /> added. The layers of the fill material shall not exceed <br /> 8 inches and each layer shall be compacted with suitable <br /> compaction equipment to provide the specified dry <br /> densities. <br /> _ ( 4 ) Required Densities <br /> The dry density of the compacted earth fill shall be at <br /> least 90 percent of the maximum dry density obtainable in <br /> the ASTM D1557 Compaction Test. The value of the optimum <br /> moisture content and maximum dry density will be <br /> determined by the engineer and this information supplied <br /> to the contractor. <br /> (5 ) Seasonal Limits <br /> ` No fill shall be placed during weather conditions which <br /> will alter the moisture content of the fill materials <br /> sufficiently to make adequate compaction impossible. <br /> After placing operations have been stopped because of <br /> adverse weather conditions, no additional fill material <br /> shall be placed until the last layer compacted has been <br /> checked and found to be compacted to the specified <br /> densities. <br /> ( 6 ) Control of Compaction <br /> The density of the upper 6 inches of subgrade and of each <br /> layer of fill shall be checked by the engineer after each <br /> layer has been compacted, Field density test shall be <br /> used to check the compaction of the fill materials. <br /> Sufficient tests shall be made on each layer by the <br /> engineer to assure adequate compaction throughout the <br /> entire area. If the dry densities are not satisfactory, <br /> the contractor will be required to increase the weight of <br /> the roller, the number of passes of the roller, or <br /> manipulate the moisture content as required to produce <br /> the specified densities. <br /> ?pER50 <br /> P 1 <br /> D � <br /> Z W <br /> O � <br /> 9SS OGS <br /> P <br />