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_„ <br />Cap Allen Engineering <br />145 East 13th Street • Durango, Colorado 81 301-51 30 (303) 247-0088 <br />Lynn Fechter <br />REF: BLUE FLAME COAL MINE CALCULATION OF NEW STRUCTURE TO RETENTION <br />POND <br />In view of the deviation from the 1 /2 24" cmp specified on the <br />above project, a calculation has been done for the new pipe. <br />To construct the new pipe, metal roofing material was used. An "n" <br />of 0.020 was assumed. The slope of the conveyance is nowhere less <br />than 2$, and the capacity will thus be adequate for the 3.53 CFS <br />calculated as required. <br />Thank you, <br />~"ap Al~~len <br />12/6/89 <br />