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'... <br />Cap Allen Engineering <br />145 East 13th Street ~ Durango, Colorado 81 301-51 30 <br />COLORADO DEPARTMENT OE' bIATUKAL RESOliRCES <br />MItJED LAND RECLAMATION DIVISIO:v' <br />1313 SHERMAN STREET <br />DENV3R, COLD?AAO E07.03 <br />ATTN: DA:J MATTHEiJS <br />(303) 247-0088 <br />REF: 91ue Flame Coal Mine Drainage Retention Pond As-Built Volume <br />On January 25, 1990 a site visit was ms3e to the Blue Flame Coal <br />Mine and the retention pond construction ir_spected and as-built <br />volume determined. <br />The calculated volume of the silt retention is 1516 cubic feet and <br />the "active volume" of the pond is calculated at 9031 cubic feet. <br />The required volume to store the runoff from a 10 year - 24 hour <br />storm is 4621 cubic feet. As can be seen the existing pond has <br />more than enough capacity. <br />Thank you, <br />Cap A1'len <br />2/5/90 <br />