2011-07-22_REVISION - M1992069 (3)

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April 17, 2000 Mr. Rex Fletcher Corps of Engineers Omaha District Denver Regulatory Office 9307 S. Platte Canyon Road Littleton, CO 80128 -69901 Re: CAMAS Colorado, Inc. — F Street Mine Site Wetlands Section 404 Permit No. 199280589 Dear Mr. Fletcher: AGGREGATE INDUSTRIES This letter is submitted as a written request to amend the wetlands mitigation plan for the above - referenced site. This amendment proposal is a result of recommendations and conclusions reached during our recent meeting with you, held April 5, 2000, at your office. During our meeting, we reviewed the history and status of the project, and it was noted that approximately 5.6 acres of wetlands have been disturbed to date. While mitigation of this disturbance has commenced, no mitigation has been completed. CAMAS inherited the existing mitigation plan, and a portion of the unmitigated disturbance, through an acquisition. As we discussed, the existing plan does little for providing establishment of quality wetlands throughout the life of the mining project. The following amendment request provides for the creation of viable, permanent wetlands through a more practical, albeit longer -term, approach. The end result will increase the total wetlands acreage and improve wildlife habitat beyond that which was outlined in the original permit requirements. In order for CAMAS to bring the permit into compliance and to enhance the existing plan, the following items are submitted for your approval (please refer to the enclosed drawing for "Area" locations): • Area A (approximately 4.9 acres of wetlands) — This area, located at the eastern edge of the property, will be constructed immediately. Currently, fines are being placed to groundwater level. Fines will be sloped at approximately 10:1 for polestrian wetland, 6:1 for emergent wetland, and 3:1 for deep, open -water shelf. Wetland vegetation will be planted in springlsummer 2001. Your suggestions for vegetation appropriate to this area would be appreciated. The anticipated completion date for the Area A wetlands is approximately two (2) years from present. • Area B (approximately 8.3 acres of wetlands) — Mining has commenced in the eastern portion of this area. Construction of wetlands will commence in this area when construction of Area A wetlands has been completed, i.e. approximately two (2) years from present. Backfilling of fines to groundwater level and sloping will replicate that noted for Area A. A wetland buffer of open Aggregate Industries West Central Region, Inc. 3605 South Teller Street Lakewood, CO 80235 Connie Nickle Davis P.O. Box 3121, Greeley, CO 80633 Telephone: (970) 3366526 Fax: (970)37S9 -6856 Telephone: 303- 985 -1070 An Equal Opportunity Employer