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M03106GE <br />MOISTURE CONTENT <br />The contractor may be required to add the moisture to the fill material in <br />the excavation if, in the opinion of the soils engineer, it is not <br />possible to obtain uniform moisture content by adding water during <br />placement and compaction. Additionally, the contractor shall not place <br />backfill material which exceeds the maximum moisture content specification, <br />unless the material is left to aereate or blended with drier material to <br />achieve the specified moisture content. Compacted fill should be placed <br />at a moisture content within the limits; as defined by the geotechnical <br />engineer. Optimum moisture content is defined as the moisture content <br />corresponding to the maximum density of a laboratory compaction test <br />performed according to ASTM D1557-70. <br />COMPACTED DENSITY <br />After each layer has been placed, mixed and spread evenly at the specified <br />moisture content, it shall be thoroughly compacted to a minimum percent of <br />maximum density as determined by the geotechnical engineer. Maximum <br />density is defined as the highest density attained from the laboratory <br />compaction test performed according to ASTM D1557. <br />COMPACTION METHOD <br />Compaction shall be by suitable compaction equipment. We suggest a smooth <br />• drum, vibratory or pneumatic tire roller for granular soils and a <br />sheepsfoot or segmented roller for cohesive soils. Compaction shall be <br />performed while the material is at the specified moisture content. <br />Compaction of each layer shall be continuous over its entire area and the <br />compaction equipment shall make sufficient passes to provide that the <br />required density has been obtained. <br />FIELD TESTING OF DENSITY AND MOISTURE CONTENT <br />Field density and moisture content tests shall be made by the soils <br />engineer during construction of each layer of fill. The frequency of <br />testing will be determined by the soils engineer in the field, depending <br />on the conditions encountered. Density and moisture content tests shall <br />be performed in accordance with ASTM D1556 using a four or six inch sand <br />cone, or ASTM D2922 and D3017 with nuclear density devices and methods. <br />OBSERVATION AND TESTING <br />Observation and testing by the soils engineer shall be continuous during <br />the fill and compacting operations so that the intent of the geotechnical <br />recommendations can be properly interpreted and the results of the <br />observations and tests can be reported upon the completion of the project. <br />SEASONAL LIMITATIONS <br />No fill material shall be placed upon frozen subgrade, nor placed, spread <br />• or rolled while it is frozen or thawing, or during unfavorable weather <br />C2 <br />~Lam6ert ana ~,ooociateo <br />CONSULTNG GEOTEGNNICAL ENGINEERS ANO <br />MATERUL TESTNG <br />