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iii iiiiiiiiuiuiii <br />999 <br />crpRUs <br />"~ Empire Corporation <br />January 24, 1991 <br />P.O. Box 68 <br />Craig, Colorado 81626 <br />303-824-6246 <br />RECEI~JED <br />JAN 2 8 1991 <br />Anthony J. Waldron <br />Colorado Mined Land Reclamation Division <br />215 Centennial Building <br />1313 Sherman Street <br />Denver, Colorado 80203-2273 <br />RE: Minor Revision 91-18 Coal Stockpile, Permit C-81-044 <br />Dear Mr. Waldron: <br />Mined Land <br />Reclamation Division <br />Cyprus Empire Corporation (CEC) is requesting a minor revision in order to expand the maximum <br />amount of coal stored at the primary raw coal stockpile to 210,000 tons. This is necessary because <br />of variations in production and delivery schedules. <br />This will not require any increase in the size of the existing disturbed area where coal is stored and <br />handled. A recent survey of the coal stockpile shows a basal area of 206,821 square feet. This does <br />not include the area where the existing coal berm has been placed to protect Ditch 5-Di on the south <br />side of the stockpile. It appears that past estimates of the stockpile pad area were based on the <br />existing map rather than a survey. To correct this, the Map 26 has been revised in line with the survey <br />to more accurately show the stockpile pad location and size. <br />Using a basal area of 206,821 square feet, a stockpile height of 55 feet, and an angle of repose for coal <br />at 35 degrees, yields a stockpile volume of 9,248,607 cubic feet. Using .0275 tons of coal per cubic <br />foot yields a stockpile of 254,336 tons. As can be seen from this demonstration, 210,000 tons of coal <br />can be fit into existing area without causing additional disturbance or modifying the existing sediment <br />control system. <br />Pages 2.05.3-26, 2.05.3-28, 2.05.4-14R and Map 26 have been revised so they can be inserted into the <br />permit. <br />If there are any questions or concerns, please contact me. <br />Sinc rey, <br />Terrell K. Johnson <br />Environmental Engineer <br />TKJ/kaw <br />Enclosure <br />