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6 t ' r i (3) Placing and Compacting Fill materials shall be spread in layers and shall have k uniform moisture content that will provide the specified dry density after compaction. If necessary to obtain uniform distribution of moisture, water shall be added to each layer by sprinkling and the soil disced, harrowed, or otherwise manipulated after the water is added. The layers of the fill material shall not exceed S inches and each layer shall be compacted with suitable compaction equipment to provide the specified dry densities. (4) Required Densities The dry density of the compacted earth fill shall be at least 90 percent of the maximum dry density obtainable in the ASTM D1557 Compaction Test. The value of the optimum moisture content and maximum dry density will be determined by the engineer and this information supplied to the contractor. (5) Seasonal Limit No fill shall be placed during weather conditions which will alter the moisture content of the fill materials sufficiently to make adequate compaction impossible. After placing operations have been stopped because of adverse weather conditions, no additional fill material shall be placed until the last layer compacted has been checked and found to be compacted to the specified densities. (6) Control of Compaction The density of the upper 6 inches of subgrade and of each layer of fill shall be checked by the engineer after each layer has been compacted, Field density test shall be used to check the compaction of the fill materials. Sufficient tests shall be made on each layer by the engineer to assure adequate compaction throughout the entire area. If the dry densities are not satisfactory, the contractor will be required to increase the weight of the roller, the number of passes of the roller, or manipulate the moisture content as required to produce the specified densities. Q CARS y n N � W Q � So C"% P