2016-03-25_REVISION - M1989029 - Laserfiche WebLink

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AGGREGATE Mr. Peter Hays, Division of Reclamation, Mining and Safety INDUSTRIES March 25.2016 Page 2 While the majority of the flood impacted gravel pit areas no longer exist to be reclaimed, allowing the natural course of the current primary flows of the St. Vrain to continue throughout the site is achieving the approved post-mining land goals of establishing a diverse habitat suitable to Longmont's St. Vrain Greenway Master Plan. Restoration and improvements in flood impacted areas within extents of mining related disturbances of Longmont Distel will be completed in accordance with the City's Resilient St. Vrain Project as submitted in Longmont's Section 404 permit application to U.S. Army Corps of Engineers(Application No. N WO-201 -02224-DEN). The work proposed under the 404 permit application is summarized in the enclosed "Sandstone Ranch Reach Improvements Summary" provided by the City. In a continuing partnership with Longmont.Aggregate will perform certain post-flood improvements activities in accordance with the "Resilient St. Vrain Project". The areas for which Aggregate will provide this work are adjacent to its ongoing processing and reclamation activities and are identified on Exhibit F-1. Background Information All extraction activity was completed at the Longmont Distel Operation in 2011. Processing and sales of material from an adjacent operation (Permit No. M-1994) is ongoing. Reclamation of portions of Peschel and Sherwood parcels owned by Longmont and Longmont/Boulder County was completed in 2009. Re-seeding of some of these areas was done in 2012 and the revegetated areas were being managed for weed control with the goal of obtaining release of these reclaimed areas from the Longmont Distel Operation permit by the end of 2013. Backfilling and grading along a portion of the southern boundary of Bigelow was completed in 2012 and grading of the Bigelow excavation floor was being progressed in 2013 to achieve the diverse post-mining topography set forth in TR-4 for Longmont Distel Operations. The September 2013 flood event stripped vegetation and scoured topsoil and overburden from the previously reclaimed and ongoing reclamation areas. Topsoil and overburden was also scoured away in other areas that had not yet been revegetated and material stockpiled for reclamation was washed away. There was significant erosion and deposition across the site. In response to the September 2013 flood event, which impacted the majority of St. Vrain Creek and its tributaries. the St. Vrain Creek Coalition was formed to initiate a master plan for the St. Vrain Creek at a watershed scale and develop a long-term flood control and stream restoration approach. The coalition consisted of representatives from Boulder County. Natural Resource Conservation Service.Town of Lyons. City of Longmont. St. Vrain and Left Hand Water Conservancy District. USDA Forest Service. Arapaho Roosevelt National Forest. Colorado Department of Transportation. and the Colorado Water Conservation Board. Throughout the development of the master plan. numerous community meetings were held to obtain input from public agencies. property owners, ditch companies. stakeholders. and the general public. The