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<br />TRAPPER MINING INC. <br />~~ <br />May 19, 1987 <br />CERTIFIED P577401542 <br />Mr. Gregg Squire <br />Colorado Mined Land Reclamation Division <br />423 Centennial Building <br />1313 Sherman Street <br />Denver, CO 80203 <br />Dear Gregg: <br />Re: Technical Revision No. 34: Reconstruction of Sediment <br />Control Ponds in 1987. <br />Trapper Mine has planned an extensive sediment pond reconstruction program for <br />1987. Five existing ponds will have embankments reconstructed and new spill- <br />ways installed. Table 34-1 lists the ponds. This technical revision incor- <br />porates the new spillway design proposed for the 1987 ponds, removal of John- <br />son Pond 7A and removal of Johnson Gulch Diversion No. 1 and 2. Supporting <br />hydrologic information is attached and should be inserted into Appendix Q, <br />Section VI, Johnson Hydrologic Model. <br />All ponds to be modified will incorporate the general spillway design approved <br />in Technical Revision No. 25 (Pyeatt and Johnson Gulch Sediment Control Plan). <br />However, slight modifications have been made in the design of the principal <br />spillway. Instead of a semi-circular metal flume, a concrete lined, "V" <br />bottom ditch will be used. <br />The five ponds to have the embankments reconstructed will be closely monitored <br />by the certifying engineer. At present, the embankments to be rebuilt will be <br />rebuilt only above the stage of the existing principal spillway (culvert). <br />Gregg, attached are revised pages 4-191 and 4-192. They clarify the principal <br />spillway design, update the background information submitted in Appendix Q, <br />and provide specifications of embankment construction. Corrected pages are to <br />be inserted in Appendix Q, Sections VI and XIV. In addition, a new page <br />(V-Ditch Spillways) is to be added to Section XIV, after the "Open Channel <br />Flow" calculation page. <br />A revised, updated Map M51 is enclosed showing redesignation of Johnson Ponds <br />7R and 8R, No-Name Pond No SR, East Buzzard Pond No. 1R and Ute Pond No. 1R. <br />Also shown is the removal of Johnson Pond 7A as it is no longer needed for the <br />Johnson Gulch sediment control system. Revised Map M-51 also shows some pro- <br />posed ponds to be constructed at a later dale once the Division gives <br />cont. <br />P.O. Box 187 Craig, Colorado 81626 (303) 824-4401 <br />