2005-11-14_REVISION - M1978056 - Laserfiche WebLink

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The Flood Control Mitigation Plans provided aze deemed "draft plans" as they will still be subject to review and approval by Weld County and FEMA. Please indicate whether the operator Varna Companies, Inc. (VCI) would prefer to a) commit to providing final designs and specifications, and reclamation costs following approval from Weld County and FEMA, or b) leaving the review of this revision request "open" until such time that the necessary approvals from Weld County and FEMA are secured. In order to leave this revision request "open", VCI will need to waive their right to a decision within 30 days. Please respond. Refer to VCI correspondence of 25 Apri12005 pertaining to VCI waiving its right to a review decision within 30 days (previously submitted). 2. Please affirm that the FCMP assures that any potential for adverse offsite impacts to adjacent landowners on either side of the Cache La Poudre River during future flooding events have been minimized. Mitigation of impacts to adjacent landowners is the detailed intent of the designed FCMP engineered by Anderson CE. We believe a more technical answer beyond that evidenced by the diverse studies, maps and accumulated engineering performed by Anderson CE, and submitted to DMG for examination, is best addressed by Anderson CE should the Division's concerns be more specific. 3. Please indicate whether the anticipated water surface elevation fora 10-year, 25-year, 50- yeaz, or 100-yeaz flooding event will exceed the north bank elevation for the Anderson Salvage or Bliss Produce property to the north. If so, please estimate the depth and velocity of flood waters encroaching onto the Anderson and/or Bliss property. Per Anderson Consulting Engineers, Inc., FEMA requires the delineation of the 100-year and 500-year floodplains as shown on Sheets 1 thru 4 of the hydraulics study. Therefore, the extent of the 10-,25 -, and 50-yeaz events has not been delineated. However, the 10-yeaz event is considered the "bank full" event and is typically contained within the active channel banks. Sheet 4 documents the extent of the 100 year floodplain in the revised (with project) condition. Sheet 4 indicates that the 100-year flood will be out of the active/main channel in several locations along the north bank. Velocities and depths in the north overbank azeas during the 100-yeaz flood will be slow moving and generally less than 2 feet deep respectively. 4. As previously provided during the Amendment No. 1 application review, Varna Companies, Inc. has committed to complete reclamation of the flood control berm within 90 days of approval from appropriate regulatory agencies and to provide the Division with a set of"As Built" construction designs within 30 days of the completed berm reclamation. The "As Build designs will also need to be signed and certified by a registered professional engineer with experience in floodplain and floodway hydraulics. The certification will need to assure that the flood control structure has been constructed according to the design specifications. Please affirm. Varna Companies, Inc. M1978-056 Durl4un Sand & Gravel Pit -Technical Revision 2 -Monday 14 November 2 2005