Laserfiche WebLink
extent, elevation, and condition of the flood control boundary along the south bank of the Cache <br />La Poudre River at the time of submittal for the original permit application, ie: February 28, <br />1978. Please provide. <br />28. Existing Flood Control Dike : VCI has specified that they are retaining all aspects of the <br />original application that apply to Floodway or Floodplain considerations, aspart of the <br />Amendment, or any subsequent revision. The current permit specifies that 100% of the Durham <br />Pit lies within the Intermediate Regional Flood Zone and 97% lies within the Standazd Project <br />Flood Zone as reported by the US Army Corps of Engineers in their report of March, 1974, <br />prepared for the Lorimer-Weld Regional Planning Commission. The current permit also <br />specifies the following with respect to the flood control dike along the south bank of the Cache <br />La Poudre River: "The dike will be constructed approximately 100 feet wide as measured from <br />the top of the river side of the dike to the toe of the dike on the lake's edge. The dike will be <br />raised to a point approximately 9 feet above the bed of the Cache La Poudre River. The top of <br />the dike will be approximately 30 feet with the slope toward the lake at approximately 5:1. The <br />dike on the river side will be 2:1. The dike will be seeded in the first appropriate season <br />following its completion. The river side of the dike will be riprapped with broken concrete and <br />other suitable material. The interior portion of the dike will also be re-inforced with similaz <br />material before being covered with overburden and topsoil." <br />Based on these conditions, the Division requests that VCI provide a detailed survey of the Cache <br />La Poudre River for the reach that bypasses the Durham Pit. The survey will need to include a <br />longitudinal profile of the thalweg of the river, and representative cross sections that extend <br />from the north bank of the river to the bottom of the pit north slope or edge of berm, whichever is <br />farther. The survey will also need to include the 9 feet above the thalweg elevation along the <br />existing flood control berm and define the volume of berm material to be removed (excess) or the <br />volume of berm material left to be constructed. In addition, the Division requests that VCI <br />provide designs, plans, and details for completing the backfilling and grading and slope <br />protection measures (riprap) that will be used to stabilize the river and pit sides of the flood <br />control berm. Please provide. . <br />29. Objector Comments -Impacts to Surface and/or Groundwater :Several objection letters <br />allege possible adverse offsite flooding impacts based on the current configuration of the existing <br />flood control dike. Please provide a hydrologic assessment of the potential for adverse flood <br />related impacts and the magnitude of storm event or storm events that would be required to <br />create an adverse offsite flood related impact. Please respond. <br />6.4.12 EXHIBIT L -Reclamation Costs <br />Reclamation Costs -Flood Control Dike : VCI will need to provide a detailed estimate of the <br />reclamation costs needed to complete the existing flood control dike according to the approved <br />construction specifcations as outlined in Item 28 above. Such estimate will need to include <br />earthmoving and re-grading costs as well as delivery and installation costs for suitable bank <br />armoring materials. Please provide. <br />