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Sample Origin Gob Pile, West Elk Mine <br />,.,,-Material Description Coal Waste <br />.` Soil Type Coal Waste <br />Test By DRS <br />Test Date 11-10-09 <br />Sample # 4 <br />130 <br />TEST RESULTS Sieve Percent <br />Size Passing <br />MAXIMUM DENSITY: 88.1 <br />OPTIMUM MOISTURE: 15.3% 5" <br />" <br />120 ROCK CORRECTION: 43" <br />MAXIMUM DENSITY: NA <br />OPTIMUM MOISTURE: 2" <br />1 %" <br />1" <br />TEST METHOD: ASTM D-698 A 3/4" <br />110 PREP. METHOD: MOIST 1/2" <br />HAMMER: MANUAL 3/8" <br />FRACTION USED: -" <br />MOLD SIZE: 4" diameter 4 100 <br />10 80 <br />20 64 <br />Specific Gravity: 40 55 <br />100 - - Liquid Limit: 100 41 <br />Plastic Limit: 200 33.3 <br />v Plasiticity Index: <br />0.02 <br />0.005 <br />v <br />I - 90 <br />Zero Air Voids Curves <br />O ? <br />so <br />Gs 1.90 <br />Gs 1.80 <br />Gs 1.70 <br />70 <br />so <br />R V DD NOW 9 8 20RO <br />e u 1 <br />50 <br />10 15 20 25 30 35 40 <br />MOISTURE - % of DRY WEIGHT <br />{wr.. <br />4 rm `` GRAND JUNCTION <br />14; , <br />rv LINCOLN - DeVORE, Inc. <br />Geotechnical Consultants <br />Grand Junction, Colorado <br />West Elk Mine <br />Somerset, Colorado <br />Oxbow Mining, Inc. <br />Somerset, Colorado <br />Job No. Drawn Date <br />93712-GJ AM 11-10-09