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~ --- _ _ ~~~ 1~~'~~I~~I'I~I~' STATE OF COLORADO MINED LAND RECLAMATION DIVISION of ~o~ Department of Natural Resources a`~ ,4> 1313 Sherman St.. Room 215 "~e Denver, CO 80203 ~ C ~ G ~ 303 866-3567 • • rY„~ 6 • • FA x: 303 832-8106 Roy Romer. Governor Fretl R. 8ania. Divivon Director August 6, 1991 Kaiser Steel Resources c/o Mr. Mike Keegan Star Route No. 3 P.O. Box 52A Pagosa Springs, Colorado 81147 SUBJECT: Certification of Sedimentation Pond No. 3 Colorado Coal Mine No. 1, C-81-024 Dear Mr. Keegan: I have been assigned the responsibility of lead specialist for the CCMC No. 1 Mine. I am a hydrologist and have worked in the coal section of the Division for the last five years. I inspected CCMC No. 1 both in June, 1991 and July, 1991. During both inspections, the primary focus was the sediment control system. I was aware that the location of the primary and secondary spillways on Pond B were out of compliance with the design last spring, and that Mike Kolin had recertified the pond in early May, 1991 following some remediation work. I find the certification wanting. Construction of the Pond B embankment apparently proceeded with little reference to the design. Consequently, it is the certifying engineer's responsibility to prove that the as-built configuration can handle the anticipated flows. Mr. Kolin appears to have verified what was constructed, but he has not noted that his observations differ dramatically from the design. I am enclosing a copy of our guidelines for certification for your use and the use of your consulting engineer. Please revise the certification and prove that the pond and the ditch between Ponds A & B can handle the flows in a non-erosive manner. Please document the sizing, depth and installation of the rip-rap. I am also concerned that the outfall of Pond A will also not handle the flow where it currently goosenecks to flow west and then south. Please check that area, too.