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III IIIIIIIIIIIIIIII <br />999 <br />STATE OF COLORADO <br />MINED LAND RECLAMATION DIVISION <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, GO 80203 <br />303 866-3567 <br />FA X: 303 832-8106 <br />DATE: February 1, 1990 <br />T0: Larry Routten <br />FROM: Berhan Keffelew <br />RE: CCMC Sediment Pond Capacity (C-81-024) <br />OF ~Ufp o <br />Ne~ ~90 <br />t{o `(~ <br />.~ ~ <br />•~2d,_b <br />~ r676 ~ <br />Roy Romer, <br />Governor <br />Fred R. Banta, <br />Division D:redor <br />As you requested I went over the calculations for the sediment pond. <br />According to my calculations the sediment pond is undersized. Present <br />capacity of the pond is 13.84 acre feet. What is required is 29.47 acre <br />feet. Even taking into consideration the establishment of vegetation in the <br />reclaimed area the pond will still be 35$ below capacity. Since the clean <br />water diversion has already been reclaimed we cannot ask them to re-establish <br />the ditch. However, we might ask them to put a couple of properly sized stock <br />ponds at the base of the undisturbed drainage. Since the drainage does not <br />have to pass through a sediment control system, we might be able to explain to <br />OSM that the drainage for the undisturbed area will be stored in these stock <br />ponds. If the above suggestion` is acceptable to the operator the sediment <br />pond will have adequate capacity to hold the drainage from the reclaimed area. <br />BK/yjb <br />cc: Mike Savage <br />3668E <br />