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Sources of Zone I embankment soils may include the following on-site materials: 'Mud lens °In-place overburden 'Stockpiled overburden 'Clay fill 'Select zones of miscellaneous fill The material shall be obtained from required excavations,borrow areas, stockpiles,or other sources as specified by the Design Engineer. The soils shall be free of any deleterious materials, including materials larger than 5",as specified by the Design Engineer. Oversize rock fragments shall be wasted as approved by the Design Engineer or stockpiled for use as riprap when found to be acceptable to the Design Engineer. C. Embankment Zone 2 Zone 2 will be constructed of a clayey gravel soil meeting the following criteria: Sieve Size Percent Passing 7" 100 1-1/2" 70-95 No.4 45-80 No. 200 14-30 'No less than 70%passing the 1'/2"sieve 'Unified Soils Classification: GC,GC-SC Zone 2 shall be a well graded mixture of 12"of sand,gravel,and cobbles left behind from mining operations and 6"of weathered claystone bedrock. Where the gravel and cobble layer is less than 12", additional pit run will need to be added. 2.02 EMBANKMENT MATERIALS SUMMARY Minimum Placement Minimum Construction Unified Soils Class and Testing Testing Zone Requirements Compaction Requirements Interval Requirements Zone I CL, SC,SC-GC,CL-CH 95%of ASTM Density by nuclear Each 1,000 yds; D698 gage,ASTM D2922* Minimum PI= 12% -200 sieve,ASTM Each 10,000 yds; 35%or greater passing the D1140 No. 200 sieve Atterberg limits, Each 10,000 yds; No more than 40%retained ASTM D4318 on the No.4 sieve Zone 1B CL,SC,CL-SC,GC,GC-SC, 95%of ASTM Density by nuclear Each 1,000 yds SM,SM-SC,GM,GM-GC D698 gage,ASTM D2922* 18 to 55%passing the No. Atterberg limits, Each 10,000 yds; 200 sieve ASTM D4318 No more than 60%retained on the No.4 sieve Section 02290-Page 2 of 6 6/10