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Greg Lewicki And Associates nEn~vER OFFICE 9054 S. Forrest Drive Highlands Ranch, CO USA 80]26 March 11, 2002 Wally Erickson Colorado Division of Minerals and Geology 1313 Sherman Street, 2'a Floor Denver, CO 80203 Dear Wally: Received ~ ~ 2 2002 Durango Field Office bn of Minerals & Geology Enclosed is a second technical revision to the amendment recently submitted for the Thomas Pit of Four Corners Materials in Durango. Permit number is M-76-020. This revision accommodates changes requested by the US Army Corps of Engineersand the Division of Wildlife after a meeting which was conducted on site March 8, 2002. The changes involve elimination of the southern 200 feet of block embankment protection along the river since a grove of cottonwoods exists in this area and will provide good protection for both the bank and better protection for the lower part of the lake spillway. Erosion Contro] Liner will be placed as close as possible to the trees. CDOW asked that we provide some type of sediment protection for the time that the embankment items are installed in the river. For this reason, we added the concrete/gravel berm at the fork in the river immediately upstream from the gravel extraction area in the river. This berm will divert water to the east channel (original river channel) while the embankment protection items are being installed. Once the work is done, the temporary berm in the river will be removed. The design we have shown is adequate to handle the 100 year event and has been modified to be less impacting to the river and as aesthetically pleasing as possible. Thanks for your patience. Wally, please let us know if you can give an early approval of the river protection items so that we can install them as soon as possible during low water. Sincerely, ThaMUs F'~ t M- i9~~-oz~ A M-o f Greg Lewicki, P. E. Greg Lewicki and Associates Phone/Fax: (303) 346-5196 FrMail: lewicld7Qattbi.com