2004-04-26_REVISION - M1978056 - Laserfiche WebLink

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28. The applicant has specified that they are retaining all aspects of the original application that apply to F-oodway or Floodplain considerations, as part of the Amendment, or any subsequent revision. The current permit specifies that 100% of the Durham Pit lies within the Intermediate Regional Flood Zone and 97% lies within the Standard Project Flood Zone as reported by the US Army Corps of Engineers in their report of March, 1974, prepazed for the Larimer-Weld Regional Planning Commission. The current permit also specifies the following with respect to the flood control dike along the south bank of the Cache La Poudre River: "The dike will be constructed approximately 100 feet wide as measured from the top of the river side of the dike to the toe of the dike on the lake's edge. The dike will be raised to a point approximately 9 feet above the bed of the Cache La Poudre River. The top of the dike will be approximately 30 feet with the slope toward the lake at approximately 5:1. The dike on the river side will be 2:1. The dike will be seeded in the first appropriate season following its completion. The river side of the dike will be rip-rapped with broken concrete and other suitable material. The interior portion of the dike will also be re-inforced with similar material before being covered with overburden and topsoil." Based on these conditions, the Division requests that the applicant provide a detailed survey of the Cache La Poudre River for the reach that bypasses the Durham Pit. The survey will need to include a longitudinal profile of the thalweg of the river, and representative cross sections that extend from the north bank of the river to the bottom of the pit north slope or edge of berm, whichever is farther. The survey will also need to include the 9 feet above the thalweg elevation along the existingflood control berm and define the volume of berm material to be removed ( excess) or the volume of berm material left to be constructed. In addition, the Division requests that VCI provide designs, plans, and details for completing the backfiliing and grading and slope protection measures (riprap) that will be used to stabilize the river and pit sides of the flood control berm. Please address. Chris Pauley, civil engineer for Anderson Consulting, has requested additional time for his evaluation due to continued difficulty in obtaining established information from FEMA and the Army Corps of Engineers (refer to Chris Pauley's correspondence of 30 March 2004 requesting additional time to 28 May 2004 for completion of his initial evaluation. The information requested by the Division will be provided to the Division at the time of submittal of the completed report. Please refer to page 1 of this report as indicated (#E) 24. Attached are copies of objection letters from Michael and Robert Bliss, and Sharon and Kevin Cazbaugh regarding possible impacts to water resources in the surrounding azea. Please respond. We do not dismiss the concerns of our neighbors, yet we believe for diverse reasons the concerns are exaggerated, and no imminent threat, if any, exists. Since the Division has duected its concerns to the effect that engineering must establish the merits, we remain committed to resolve the matter at that level and allow the facts to speak for themselves. We will keep the Division appraised of our progress and resulting information derived from such work. The resolution, to the extent one is required, will follow. In the matter of Sharon and Kevin Carbaugh's concern for their well, CGRS has concluded its evaluation finding that the dewatering does not adversely affect the Cazbaugh well. Under correspondence of 21 April 2004, attached ,CGRS suggests the problem is `likely due to the type of pump used to draw water from the Carbough's well, and not the well's ability to yield water.' 6.4.10 Eahibk J - Ve¢etation Information Varra Companies, Inc. MI978-056 Durham Sand & Gravel Pit - 2003 Amendment - 13 Monday 26 Apri12004 reply to correspondence from the Colorado Division of Minerals and Geology of 6 January 2004.