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Ralston Quarry Slope Stability <br /> If surfaces to receive fill expose organic materials or loose, wet, soft, or otherwise <br /> deleterious material, additional material should be excavated, or other measures taken <br /> to establish a firm platform for filling. A surface to receive fill should be effectively stable <br /> prior to placement of fill. <br /> General Considerations for Fill Placement No fill materials should be placed, worked, <br /> rolled while they are frozen, thawing, or during poor/inclement weather conditions. <br /> Care should be taken with regard to achieving and maintaining proper moisture contents <br /> during placement and compaction. <br /> Compaction areas should be kept separate, and no lift should be covered by another <br /> until relative compaction and moisture content within the specified ranges are obtained. <br /> Compaction Criteria for the Stability Embankments Fill soils should be thoroughly <br /> mixed to achieve a uniform moisture content, placed in uniform lifts not exceeding 8 <br /> inches in loose thickness, and properly compacted. <br /> Granular materials placed as embankment fill should be compacted to 95 or more <br /> percent of the maximum dry density at moisture contents within 3 percent of the <br /> optimum moisture content as determined by ASTM D1557, the 'modified Proctor.' <br /> Compaction Criteria for Other Fills Fill soils should be thoroughly mixed to achieve a <br /> uniform moisture content, placed in uniform lifts not exceeding 12 inches in loose <br /> thickness, and properly compacted. <br /> Soils that classify as GP, GW, GM, GC, SP, SW, SM, or SC in accordance with the <br /> USCS classification system (granular materials) should be compacted to 92 or more <br /> percent of the maximum dry density at moisture contents within 3 percent of the <br /> optimum moisture content as determined by ASTM D1557, the `modified Proctor.' <br /> Soils that classify as MIL, MH, CL, or CH should be compacted to at least 95 percent of <br /> the maximum dry density at moisture contents within 2 percent of the optimum <br /> moisture content as determined by ASTM D698, the 'standard Proctor.' <br /> Job No. 18-3046 GROUND Engineering Consultants, Inc. Page 26 <br />