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M92026GE <br />• The surface of the road should be tailored to promote rapid <br />surface runoff. Surface drainage ditches should be maintained to <br />collect surface water and drain it quickly away from the roadway <br />to help reduce the potential for saturated conditions of the <br />subgrade to develop. <br />It is our opinion that if the subgrade soils do not become <br />saturated the actual service life may be somewhat longer than the <br />calculated theoretical design life tabulated above. <br />The aggregate base course material should conform to Colorado <br />State Highway Specifications for Class 6 or similar materials or <br />class 2 or similar materials. We recommend material testing of <br />these products prior to their use to determine conformance with the <br />specifications. The base course materials should be moisture <br />• conditioned prior to compaction and individual lift thickness <br />during compaction should not exceed six (6) inches. The base <br />course materials should be compacted to at least ninety (90) <br />percent of maximum dry density as defined by ASTM D1557, modified <br />moisture density relationship tests. Fill placement guide <br />specifications have been included in Appendix C. <br />4.0 POST DESIGN CONSIDERATIONS <br />This study is based on limited sampling and laboratory tests <br />performed in July and August, 1990, therefore it is necessary to <br />assume that the subsurface conditions do not vary greatly from <br />5 <br />L J <br />~Lam6ert ana ~,o,~ociaten <br />CO NSU~tiNG GEOTEC NNiCAI ENGiN EENS AND <br />MATERIAL TESTING <br />