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• the geotechnical engineer. Optimum moisture content is defined as the <br />moisture content corresponding to the maximum density of a labortory <br />compaction test performed according to ASTM D1557 <br />COMPACTED DENSITY <br />After each layer has been placed, mixed and spread evenly at the <br />specified moisture content, it shall be thoroughly compacted to a <br />minimum percent of maximum density as determined by the geotechnical <br />engineer. Maximum density is defined as the highest density attained <br />from the laboratory compaction test performed according to ASTM D1557-70. <br />COMPACTION METHOD <br />Compaction shall be by suitable compaction equipment. We suggest a <br />smooth drum, vibratory or pneumatic tine roller for granular soils and <br />a sheepsfoot or segmented roller for cohesive soils. Compaction shall <br />be performed while the material is at the specified moisture content. <br />Compaction of each layer shall be continuous over its entire area and <br />the compaction equipment shall make sufficient passes to provide that <br />the 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 <br />• shall be performed in accordance with ASTM D1556 using a four or six <br />inch sand cone, or ASTM D2922 and D3017 with nuclear density devices <br />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 />conditions. when the work is interrupted by heavy rain, snow or frost <br />penetration, fill operations shall not be resumed until the soils <br />engineer indicates that the moisture content and density of the previously <br />placed fill are as specified. <br />C2 <br />~Lat116ert aria ~,o:~ociate,~ <br />CO NSUITiNG GEOTFCN NiCAI ENG~N EENS ANO <br />MATERIAL TESTING <br />