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GASP FS for Sedgwick
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GASP FS for Sedgwick
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Last modified
3/8/2013 3:46:58 PM
Creation date
2/20/2013 10:08:11 AM
Metadata
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Template:
Water Supply Protection
State
CO
Basin
South Platte
Water Division
1
Date
2/1/1998
Author
TuttleApplegate, Inc.
Title
Feasibility Study for Sedgwick Reservoir for Groundwater Appropriators of the South Platte River Basin Inc. (GASP)
Water Supply Pro - Doc Type
Report/Study
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The 404 permit is the most critical permit to obtain for this project. The requirements of the Clean <br />Water Act allow for review by the Corps of Engineers which is in charge of issuing these permits. <br />The U.S. Fish and Wildlife Service and the EPA have the opportunity to make comments and review <br />permit applications and make recommendations to the Corps of Engineers. <br />The most critical part of the review process is based on what are called 404 (b) 1 guidelines. These <br />guidelines require an extensive alternatives analysis that look at other potential locations, different <br />configurations of the project, as well as a "no project" alternative. A persuasive argument has to be <br />presented that show to the satisfaction of the reviewing agencies that the proposed project and <br />configuration is the best and most reasonable one. <br />The proposed project will be reviewed under the Three States Agreement between Colorado, <br />Nebraska and Wyoming. During this interim period when the Environmental Impact Statement <br />(EIS) is being prepared, all new depletions to the river are supposed to be mitigated by a one for one <br />replacement. However, GASP did file a water rights application for the project prior to the signing <br />of the agreement. Therefore, since the project was contemplated prior to the agreement, it may not <br />be required to replace depletions. <br />Even if mitigation is a requirement for this project, it will not be imposed until the project actually <br />comes on -line. A possible mitigation supply for the project could be the Tamarack Project, which <br />was constructed prior to the Three States Agreement. It has the ability to supply up to 10,000 acre- <br />feet of recharge credits to the river and is scheduled for additional enlargement in the near future. <br />GASP could pursue this as a potential augmentation source to offset projected depletions. Once the <br />EIS is completed for the Three States Agreement, there could be additional requirements imposed on <br />this project. However, speculation on what these might be is beyond the scope of this report. <br />We estimate that up to 50 acres of low quality wetlands may exist on the reservoir site. All of the <br />wetlands exist solely because of irrigated agriculture. A detailed wetlands delineation will need to <br />be completed and approved by the Corps of Engineers prior to proceeding with permitting activities. <br />The Corps of Engineers has visited the site and reviewed the preliminary concepts of the proposal. <br />The first indications from Corps staff were that the project would be environmentally beneficial to <br />the river, that the wetlands were of low quality and could be mitigated, and that they would probably <br />be supportive of an application for a permit depending on how it is configured. <br />Baseline information on groundwater levels needs to be collected as a part of the project. This will <br />require measuring the six piezometers installed by EEC. We would recommend taking bimonthly <br />readings for the first 4 months. An evaluation of the results will be made at the end of 4 months to <br />determine the appropriate time interval for future measurements. The location of the groundwater <br />table is critical to the determination of the jurisdictional wetlands. <br />It is anticipated a mitigation plan will be necessary for obtaining a 404 permit for the project. The <br />extent will be based on the wetlands acreage disturbed. The fact that there are wetlands on the <br />property is significant in the fact that it shows the soils to be poorly drained. This supports the <br />technical basis of building a reservoir that would have a relatively water tight bottom. <br />The remaining permits listed in this section are technically based permits. The dam safety review has <br />specific criteria that must be met to allow for construction of the dam. The permits through the <br />Colorado Department of Health are straightforward ones based on construction activities. We have <br />not identified any concerns associated with this project that would indicate any problems in obtaining <br />these permits. <br />10 <br />
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