2011-07-22_REVISION - M1992069 (3)

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July 21, 2011 " 5 L n4 ; # / Mr. Peter S. Hays Division of Reclamation, Mining & Safety 1313 Sherman Street, Room 215 Denver, CO 80203 RECEIVED JUL 2 2 2011 Division of Reclamation, llginirl Safety Re: Permit M -1992 -069 — 83 Joint Venture Pit - Technical Revision Request Dear Peter: Aggregate Industries West Central Region, Inc. 1707 Cole Blvd., Suite 100 Golden, CO 80401 Telephone: 303 - 985 -1070 TR 7 AGGREGATE INDUSTRIES In accordance with the corrective action set forth in the Division's April 26, 2010 report of the inspection conducted March 31, 2010 at the above - referenced operation, Aggregate Industries (AI) submits this technical revision request to update and clarify the current approved reclamation plan to reflect the reclaimed configuration of the site. The following narrative and the enclosures referenced therein are submitted in response to the Division's requirements as set forth in the inspection report. Reclamation maps are generally prepared as "typical" and "conceptual" in nature, recognizing that exact reclamation cell sizes and configurations will vary due to geologic and site conditions actually encountered as mining progresses. Al's reclamation efforts at this site have progressed substantially in conformance with its Division approved reclamation plan, which provides for residential lots with two lakes for recreational use. While the configuration of the reclaimed ponds has changed slightly, the originally projected pond acreage of 67.1 has not changed. The remaining 56.9 acres of the site are to be reclaimed for the future residential development and for mitigation of impacts to wetlands. The exact acreages of these upland and wetland areas were not discussed specifically in the application and were dependent upon coordination with the Army Corps of Engineers under the site's 404 permit, DA 1992280589. The DA permit requires 18.9 acres of mitigation wetlands, which resulted in 38 acres of land to be reclaimed to upland areas, including site perimeters and the areas to accommodate future residential development. The final reclaimed surfaces outside of the lakes resulted in 19.4 acres of wetland mitigation areas and 37.52 acres of upland areas. The enclosed copies of AI's April 17, 2000 DA permit amendment request, which was submitted to the Corps to address their recommendations regarding the timing and location of wetlands, including a map showing the mitigation wetland areas, and the Corps' May 8, 2000 approval are provided for reference. As noted in the Division's inspection report, the annual report map submitted to the Division dated January 26, 2009 depicts a fairly accurate configuration of the site except the small pond located at the southern end of the eastern lake. That map has been modified to show the pond, as well as the channel between the two lakes that resulted from the flood in June 2010 as discussed in previous correspondence. The side slopes of both the pond and the channel have been reclaimed to a minimum of 3:1. The enclosed map also incorporates the other requirements set forth in the Division's report, with the exception of delineating the current approved permit. The reclamation plan map has gone through various iterations since Division approval in 1994, and subsequent revisions appear to have used different base maps at different times and therefore do not make it clear what the Division believes is the current approved plan. An Equal Opportunity Employer