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iii iiiiiiiiuiiiiii <br />Cap Allen Engineering <br />145 East 13th Street • Durango, Colorado 81301.5130 ~ ~ ~ ~ ~ ~ ~ ~ (303) 247-0088 <br />FEa 1; 1990 <br />IJINED LANU <br />REr'lAMATlON ^IVICIGN <br />COLORADO DEPARTMEtIT OF tJATURAL RESOIJRCF.S <br />MINED LAND RECLAI.7ATION DIVISION <br />1313 SHERMP_N STREET <br />DENVER, COLORADO 30<03 <br />ATTN: DAN MATTHEWS <br />REF: Blue Flame Coai Ptine Drainage Retention Pond As-Euilt Volume <br />On January 25, 1990 a site visit was made to the Elue Flame Coal <br />Mine and the retention pond construction inspected and as-built <br />volume determined. <br />The dimensional geometry of the as-built retention pond was <br />essentially as designed except the as-built pond was several feet <br />deeper. The overflow spillway had been installed as designed. <br />The calculated volume of the silt retent.i.on is 1516 cubic. feet and <br />the "active volur:ie" cf the pond is calculated at 9031 :ubic feet. <br />The required volume to st.o~•e t.!ie runoff from a 10 year - ld hour <br />storm is 4621 cubic feet. As can bz seen the existing pond has <br />more thar. enough capacity. <br />,: '-,. <br />Th'a ,~; _you .'".' . ,,+,.. <br />~Ca' ', , en; , a;= <br />2.(13./90;. .a <br />~~; <br />_ ;•,~ <br />