2011-08-29_REVISION - M1986015 (11)

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• • • PUEBLO EAST PHASE 7 Estimated Material Volumes 6/13/2011 GJT 10 Mining Plan with 50 feet setback 11 Area of mining 12 37 TABLE L -1 EXHIBIT L Assumptions: The profile is estimated from a set of incomplete drill Togs. Therefore the variance from the actual profile is unknown. No shrinkage for soil compaction in used Mining setback from the Arkansas River is 135 feet. Bottom of the S &G profile is estimated at 37 feet lower than the grade surface The mining face is vertical, except for the norht and west sides where it is1:1 slope 53% of the Sand & Gravel (S &G) volume is scapled off in the pit and left The reclaimed pit is filled to two feet above the normal groundwater table 'The groundwater table averages 13 feet below the surface. *Average profile of backfill is 26 feet, so the reclaimed area is an 11 feet deep depression The 9 foot tall levee along the River is made of overburden. At final reclamation, the levee is pushed over the backfill Backfill of existing pond and volume of existing stockpile not included NOTE: These volume calculations should be updated with specific subsurface profile data. Givens: 1 Total average depth of mining Depth of topsoil Depth of overburden Depth of S &G Amount of S & G scalped off in pit Amount of Sand retumed to pit Tons per cy of S &G Depth to groundwater Depth of backfill MINING EXCAVATION VOLUMES Volume of topsoil Volume of overburden Volume of S &G RECLAMATION VOLUMES Needed - Volume for 26 foot backfill 19 Less -left in1:1 slope on north boundary 20 Needed- Volume for drainage (0.5 %) to River Needed -Total reclamation volume Available - Volume of topsoil Available - Volume of overburden 25 Available -OB in Brown terrace 26 Available- excavation from drainage ditch 27 Available- excavation from runoff channels Available - Volume of scapled S &G 29 Av- Volume of bench under north boundary 30 Available -Phase 1 slurry pond, 3.5 acres 31 Available - Grandfathered discharge pond, 1.5 ac 32 Available - Volume of bench under levee Available - Volume for reclamation Net volume Marketable S &G 54 acres 2,352,240 sf 43,560 cy 827,640 cy 2,352,240 cy 2,265,120 63,425 130,680 2,332,375 cy 43,560 827,640 27,117 22,400 8,910 1,246,687 23,750 124,226 12,100 18,088 2,354,478 22,103 1,105,553 1,658,329 37 feet 0.5 feet 9.5 feet 27 feet 0.53 0 1.5 13 feet 26 cy cY tons 0.5% slope 22' deep 5' deep