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Minimum <br /> Placement Minimum <br /> Construction Unified Soils Class and Testing Testing <br /> Zone Requirements Compaction Requirements Interval <br /> Requirements <br /> Zone 2 GC,GC-SC 95%of ASTM Density by nuclear Each 1,000 yds3 <br /> D698 gage,ASTM 2922* <br /> Sieve analysis,ASTM Each 10,000 yds3 <br /> D1163 <br /> *Note:The design engineer may request sand cone density tests(ASTM D1556)to calibrate the nuclear <br /> density gage as required during the course of the quality control activities. <br /> PART 3-EXECUTION <br /> 3.01 GENERAL <br /> No material shall be placed in any portion of the embankment until the foundation for each section has <br /> been dewatered,stripped,suitably prepared,and has been approved by the Design Engineer. <br /> All cavities,depressions and irregularities, within the area to be covered by embankment and which extend <br /> below or beyond the established lines of excavation for slope liner embankment foundations,shall be filled <br /> with embankment materials as specified for the overlying embankment. <br /> 3.02 FOUNDATION PREPARATION <br /> A. Mine Highwall Slopes <br /> The mine highwall slopes shall be excavated to the lines and grades as shown on the detail <br /> drawings. <br /> Highwall overhangs shall be sloped back. Loose slough shall be removed prior to placement of <br /> embankment soils. Loose or slough soils on the slope may be removed as the embankment soils <br /> are being constructed. <br /> B. Removal/Stripping of Weathered Bedrock <br /> The weathered bedrock shall be stripped to a depth of 2' beneath the Zone IA/Weathered contact. <br /> The weathered bedrock will not need to be stripped beneath the Zone 1 B/Weathered contact. <br /> Care shall be taken that slabs of bedrock are not dislodged during the foundation bedrock stripping <br /> process that increase the bedrock excavation depth beyond 2'. Shallower passes with excavating <br /> equipment may be required during stripping to prevent slab dislodging along bedding planes. <br /> Where claystone is encountered: <br /> The entire foundation shall be watered,rolled and compacted to provide a suitable,non- <br /> planar bonding surface for the first lift of embankment soil. Claystone foundation shall <br /> be covered with slope liner fill soon after preparation to prevent drying and desiccation of <br /> bedrock foundation. <br /> Where excavations met with refusal(e.g. Sandstone material): <br /> The entire foundation shall be cleaned of loose material prior to placement of the first lift <br /> of embankment soil. <br /> 6/10 Section 02290-Page 3 of 6 <br />