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<br />~_: <br />Cap Allen Engineering <br />III IIIIIIIIIIIII III <br />~~~® <br />145 East 13th Street .Durango, Colorado 81 301-51 30 SAN 31 i39~ 1303) 247-0088 <br />Iu11N~D LAraq <br />Ri=C" Ap~A710!~- DiU1S!'1i'~ <br />CGLGRADO DnPAP.TMEaiT OF HATUY.AL RuSO~,RCE~ <br />P;IJdEC LAJJD RF.CLAMA.IGTJ DIVISIviv <br />1313 SHERMAN STREET <br />DF.Id6'ER, COLORADO 80203 <br />ATT?J: ATduE BP.i~D2T:'~G <br />REF: Blue Flame Ccal Mine Drainage Retentio[: Pond As-Built Volume <br />On January 25, 1950 a site visit was made to the Blue Flame Coal <br />Mine and the retention pond construction inspected and as-built <br />volume determined. <br />The calculated velume of the silt retention is 1516 cubic feet and <br />t:-,e "active volume" of the pond is calculated at 9031 cubic feet. <br />The required volume to store the runoff from a 10 year - 24 }lour <br />storm is 4621 cubic Li9eC. IlS Catl he seen the existing pond has more <br />than enough capacity. <br />,n nk ~o-~ <br />hl~w Kraushaar, P.E. <br />1%25/90 <br />