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II I I II I II I II IIII III / ~}r(}_ A t~ 1 l / `~h ~J \/ \I 999 Panorama Resource Services, Inc. 4600 E. 115th Circle Thornton, Colorado 80233 January 30, 1984 ~~~~OV~® Ms. Susan Mowry FEB Mined Land Reclamation 21984 1313 Sherman Street Denver, Colorado 80203 ft11NED LAND RECLAMATION DIVISION Celo. Dept. of Natural Resources Dear Susan: Enclosed is the Professional Engineer's Certification Report on the construction of sediment Pond "K" for the Pryor Mine. Although I was not present for any part of the construction, the following items were verified by an on site visit: (1) The road embankment is well constructed with adequate slopes and compaction. There was no evidence of cur- rent or past seepage at any point along the embank- ment. This was verified by the operator. (2) The Weir Box at the 36 inch C.M.P. principal spillway is constructed to the approved specifications except that the 9 inch circular opening in the orifice plate was changed to an 8 inch square opening. This config- uration has the same cross sectional area and will not effect any design calculations. (3) At least one foot of cover is present over the 16 gauge C.M.P. which is adequate to prevent damage. (!~ ' There was no evidence of seepage on the outer edges of the 36 inch C.M.P. The operator verified. that care was taken in compacting around the culvert and that.he has never detected any seepage. The emergency spillway which is designed as a mild-sloped low spot on the road embankment, has not yet been installed due to dif- ficult weather conditions, however the operator said he hopes to complete the spillway within two weeks. I will send a follow-up certification of the emergency spillway once it is constructed. Sincerely, PANORAMA RESOURCE SERVICES, INC. Greg Zewic~. E. GL/mf ec: Bill Wilson