Laserfiche WebLink
EUGENE M. SHEARER,P.E. <br />CONSULTING GEOLOGIST <br />5720 South Jasmine Street <br />Englewood,CO aolll-1sz5 RECEIVED <br />(303)771-2371 OCT 1d 1994 <br />24September94 <br />Mr. Bryan J. Archer `)ivi5i0no1MinBfdIS8GB0109y <br />Sun Coal Company <br />10200 West 44th Avenue, Suite 120 <br />Wheat Ridge,CO 80033 <br />RE: Meadows No.l Mine (C-81-0291 <br />Fall Quarter. 1994. Northwest Sediment Trap Inspection <br />Dear Bryan: <br />While conducting the fall inspection of the sedimentation <br />ponds on 18 and 19September94, I thought it might be <br />appropriate to inspect the "trap" in case the Division of <br />Minerals and Geology determines the "trap" to be an <br />impoundment. The report is as follows. <br />Structural Weakness None <br />Erosion and Vegetation No rills or gullies disturb either <br />the upstream or downstream embankment slopes. Vegetation is <br />sparse to absent in the trap area, which presumably relates <br />to the watering of cattle and wildlife at the trap pond. <br />Hazardous or Potentially Hazardous Conditions Although the <br />dewatering pipe is calculated to have the capacity to <br />function adequately for a 100 year 24 hour precipitation <br />event, any clogging of the pipe could produce a potentially <br />hazardous condition. <br />Sediment Level 2.1 feet below the base of the dewatering <br />pipe. Several inches of water cover a part of the pond <br />bottom. <br />Required Maintenance The sediment trap should be observed <br />from time to time for a build up of sediment in the pond <br />bottom. <br />Discharge Structure The 1.75 foot outside diameter <br />dewatering pipe is clear of all debris, and the riprap at <br />the pipe outflow is in acceptable condition. <br />