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_ February 23, 1994 <br />• <br />Ms. Shawn E. Smith <br />Reclamation Specialist <br />Division of Minerals and Geology <br />1313 Sherman St. Room 215 <br />Denver, CO 80203 <br />RE: MR -23 Quarterly Inspection of all Impoundments <br />Keenesburg Mine C-81-028 <br />Dear Ms. Smith: <br />The Division has requested that Coors Energy Company (CEC) return to <br />quarterly pond inspections, by a qualified registered P.E., or other <br />qualified individual under the direction of a qualified registered <br />P.E.. <br />• As you know, the Keenesburg Mine is unlike other mines in the State <br />of Colorado for these reasons: <br />Two sandy soils make up most of the site. The Valent and <br />Osgood sands are found to a depth of approximately 30 feet. <br />Permeability is rapid to moderately rapid. Available water <br />holding capacity is moderate to low. Surface runoff is very <br />slow and water erosion hazard is low. Wind erosion hazard <br />is high on disturbed areas. (Permit, Volume II, Appendix K) <br />* After 13 years of operation sediment pond 42 has never <br />accumulated more than one foot (1) of water and has within <br />one or two days returned to empty. The operator can only <br />remember a couple of times when water accumulated in the <br />pond. <br />* Over the last 13 years sediment level in Pond #2 is <br />practically nothing. Wind blown erosion from maintenance <br />activities make up the majority of the present sediment. <br />* Further, because no measurable water has accumulated in <br />. Sediment Pond 42 for long periods of time and has never <br />108 5196 <br />