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• ; • ~ III'lllll'IIIIII'll ~ sss MINED LAND RECLAMATIOtd DIV;SIOtJ DeUanmen: of Natural Resources 1373 Sherman St. Room 215 Denver, CO 60203 303 8663567 FA%: 303 6326106 February 5, 1990 Mr. W.D. Lamoreux, President First National Bank of Florence P.0. Box 389 Florence, CO 81226 Re: La Plata Mine Reclamation, File No. C-87-072 Dear Mr. Lamoreux: JF CG~O ..~ ~~' 10 .1. ~:.i. ,.x ... . ~ lR]6 ~ Foy Rorno. Go~ernOr Fred R. Banla. D,vs,on D.reaar We have reviewed your letter of January 22, 1990, and we find that two issues, portal bench backfilling and post reclamation sediment control have not been satisfactorily addressed. With regard to the back filling plan, the cross sections submitted depict backfilled slope gradients ranging from 75% to 125%. These slope gradients significantly exceed gradients set forth in the approved plan, and the criteria we outlined in the December 15, 1989 letter to you. In that letter, we stated that we would "require that the maximum highwall height reduction possible be achieved, given the material available within the mine bench and the constraint of a final reclaimed slope gradient average of between 40~ and 50%, with no slope segment steeper than 60%." The enclosed cross sections based on the survey based topographic map we had forwarded to you earlier depict acceptable reclamation profiles. The slope should be achievable based on material available in the fill bench and would result in a more stable, and a more easily reclaimable topography than that depicted in the January 22 letter. The regrading plan as depicted in the January ZZ letter will need to be revised in accordance with the criteria outlined above and will need to be submitted to us by February 15, 1990. The need for an alternative sediment control plan to be implemented prior to removal of the existing sediment pond on Mr. Sarver's property was addressed under Task 18 of our December 15 letter. Your January 22 letter did not respond to Task 18. We will need a written commitment from you prior to the February 21 Board meeting specifying than an appropriate alternative sediment control plan will be submitted by June 1, 1990. Your letter of January 22 questions whether or not you should have a representative at the February 21 Board Meeting. That decision is entirely up to you. If acceptable plans are submitted by February 15, as requested, we will prepare a letter of agreement for your signature and we will recommend to the Board that your request be approved. If acceptable plans are not ~I • STATE OF COLORADO received, we will recommend that your request be denied.