2012-08-14_REVISION - M2002020 (5)

Home Browse Search

Mr. Peter Hays RE: City of Greeley M- 2002 -020 August 10, 2012 6.4.13 Exhibit M — Other Permits and Licenses 25. Copies of approved permits and licenses required for the 25 Avenue Site operation will be provided to the Division upon request. 6.4.14 Exhibit N — Source of Legal Right to Enter 26. The current name is "Cottonwood Land and Farms, LLC ". The name was officially changed, but the Weld County Assessor' s Office still has the name "Cottonwood Land and Farms, LTD ". Therefore, the name on revised Exhibit C -1, Site Layout, Man -Made Structures, and Surface Owners of Record, has been changed to "Cottonwood Land and Farms, LLC" for consistency with the application text. The revised Exhibit C -1 is attached. 6.4.18 Exhibit R — Proof of Filing with County Clerk and Recorder 27. The date stamped "proof of delivery" transmittal letter for these adequacy review comment responses to the Weld County Clerk to the Board is attached. 6.4.19 Exhibit S — Permanent Man-Made Structures 28. With the mining cell top of bank setback a minimum of 50 feet from the permit boundary, and a created 3H:1V slope to an approximate lake depth of 20 feet, the setback from the permit boundary for new excavation will be at least 110 feet from the permit boundary. For the M- 2002 -020 permit application submitted in 2002, slope stability analyses were performed by Applegate Group, inc. for continued mining and slurry wall installation at the existing 25 Avenue Site Reservoir. A copy of the slope stability analysis is attached. The lake used to create the existing reservoir and the SW Ponds in the amendment area were mined and partially reclaimed similarly. Mining assumptions and geotechnical conditions at the site have not changed during the last 10 years and, therefore, it is believed that results of the original slope stability analysis are applicable to this amendment. Recommendations from the slope stability analysis include safe mining setbacks of approximately 120 feet from the slurry wall and other man -made structures if mining progresses at a near vertical slope. However, the analysis does not recommend additional setbacks or identify concerns if the mining progresses at a 3H:1V slope from the toe of the existing lake(s) slope. It is believed that the existing lake(s) side slopes are about 3H:1V. If the side slopes are not 3H:1V or flatter, they will be flattened to 3H:1V prior to continued excavation at 3H:1V slopes. Even with continued mining at near vertical slopes, the 2002 slope stability analysis found that setbacks near those proposed in this amendment provided protection for the slurry wall and other man-made structures. For creation of the amendment area reservoir, mining will progress at 3H:1V slopes (see commitment in #15 above). Based on the existing slope stability analysis and other available information, we Page 4 of 5