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• III IIIIIIIIIIIII III <br />MINED LAND RECLAMATION DIVISION <br />Department o) Natural Resources <br />1313 Sherman St., Room 215 <br />Denver. CO 80203 <br />303 8063567 <br />FAx~ 303 8328106 <br />September 28, 1990 <br />Mr. W.D. Lamoreux <br />First National Bank of Florence <br />P.O. Box 389 <br />Florence, Colorado 81226 <br />• <br />STATE OF COLORADO <br />pF CO(O <br />a`s•~J~'1A9 <br />N ~ O <br />~:l <br />•;~~~ <br />1816 ~ <br />Roy homer. <br />Governor <br />Fred R. Banta, <br />Division Director <br />The Division has received and reviewed your 11•September, 1990 sediment <br />control plan and finds that a more extensive and detailed plan is in order. <br />Since the primary means of sediment control (the sediment pond) has been <br />removed, an extensive "alternate sediment control" system is required to <br />minimize erosion and to approach an acceptable effluent limit for disturbed <br />waters. <br />The Division performed and inspection of the La Plata mine in mid-September <br />and the aftermath of a recent rainstorm indicates that substantial efforts <br />must be made in order to prevent further erosion and to protect the <br />re vegetation efforts when seeding is completed. <br />The means of attaining this goal will be a combination of silt fences, energy <br />dissipators, rock check dams, sediment traps, temporary diversion ditches and <br />straw bales. <br />In addition to the alternate sediment control measures, it is highly advisable <br />to consider using jute or a soil retention blanket to further protect the <br />seeding efforts on all of the steep slopes at La Plata. <br />If you so desire, the Division will assist you in determining an effective <br />site specific sediment control plan with the type, sizing, and location of <br />each control measure required. The sediment plan, with the appropriate maps <br />must be submitted and approved by the Division prior to any revegetation <br />efforts. <br />If you have any questions regarding this or any other matter, please call or <br />write. <br />Sincerely, <br />Harry B. Ranney <br />Reclamation Specialist <br />HBR/yjb <br />0379E <br />