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Colorado - Fraser Sedimentation Basin_Water Activity Summary
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Colorado - Fraser Sedimentation Basin_Water Activity Summary
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Last modified
10/15/2012 4:02:27 PM
Creation date
3/13/2008 2:30:35 PM
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Template:
WSRA Grant and Loan Information
Basin Roundtable
Colorado
Applicant
Grand County
Description
Fraser River Sedimentation Basin
Account Source
Basin & Statewide
Board Meeting Date
3/19/2008
Contract/PO #
150449
WSRA - Doc Type
Water Activity Summary Sheet - CWCB Evaluation/Approval Documents
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Water Supply Reserve Account – Grant and Loan Program <br />Water Activity Summary Sheet <br /> <br /> <br />Applicant: <br />East Grand Water Quality Board <br />Water Activity Name: <br /> Fraser River Settling Pond <br />Amount Requested: <br /> $187,900 <br />$127,900 (Statewide Account) and $60,000 (Basin Account) <br />Matching Funds <br />: Yes, $60,000 from CDOT <br />Water Activity Purpose: <br /> Structural water project <br />County: <br /> Grand <br />Drainage Basin: <br /> Fraser River <br />Water Source: <br /> Fraser River <br /> <br /> <br />Water Activity Summary: <br />This is a structural water project to make improvements to a previously designed sediment pond with the <br />same goal; to capture sand from current and historical maintenance of Berthoud Pass, as well as natural <br />erosion of the mountainside, before that sediment smothers the remainder of the Fraser River. <br />Improvements to the pond design will include creating a D shaped berm structure to slow the velocity of <br />the river in the pond area to allow for sediment deposition before the water flows through Denver <br />In <br />Water's diversion dam. the fall this pond will be drained for maintenance via improvements included <br />in the project plan to a previously installed diversion pipe, and sediments will be removed to a Grand <br />County gravel pit. The Project includes new access for maintenance vehicles from the opposite side of <br />the pond so that there is no traffic over Denver Water's diversion pipe. <br /> <br />CDOT currently deposits nearly 10,000 tons of traction sand on the west side of Berthoud Pass, and <br />a <br />recovers little over half that with vacuuming and excavation. Reduced flows in the Fraser River <br />coupled with excessive sediment deposition mean that the Fraser is unable to flush the sediment that <br />enters the river, and aggregation, migration of the stream channel, and deterioration of aquatic and <br />riparian habitats are occurring. <br /> <br />A biological and habitat inventory was conducted prior to the sedimentation pond construction in the <br />summer of 1998 with the DOW doing the fish inventory. Project construction was completed in 1999 <br />with follow up studies done in 1999 and 2000. The conclusion drawn at this time was that access for <br />maintenance was inadequate and that sediment tended to flow thought the pond on the east side where <br />the Fraser River entered the pond. Since then plans for the pond have undergone several revisions in <br />consideration of the concerns of the parties involved, with the result being the plan that is attached to <br />this grant as supporting documentation. <br /> <br /> <br />Repair and improve the existing river diversion pipe and gate valve. These components will be <br />? <br /> <br />used to redirect the flows away from the pond for sediment removal purposes. <br />Remove existing unstable soils and sediment deposition. <br />? <br /> <br /> 1 <br />
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