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Windy Gap Firming Project Draft Environmental Impact Statement August 2008
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Windy Gap Firming Project Draft Environmental Impact Statement August 2008
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Water Supply Protection
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Windy Gap Firming Project Draft Environmental Impact Statement August 2008 Reclamation Managing Water in the West
State
CO
Date
8/1/2008
Title
Windy Gap Firming Project Draft Environmental Impact Statement August 2008
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EXECUTIVE SUMMARY <br />WINDY GAP FIRMING PROJECT DRAFT ENVIRONMENTAL IMPACT STATEMENT <br />Alternative 2 (Proposed Action) <br />The Proposed Action includes construction of a 90,000 AF <br />Chimney Hollow Reservoir, along with the ability to store, <br />or preposition, C -BT water in the new reservoir (Figure ES- <br />4). Water would be conveyed to Chimney Hollow Reservoir <br />via a new pipeline connection to existing East Slope C -BT <br />facilities. New connections between Chimney Hollow <br />Reservoir and Carter Lake would allow delivery of water to <br />Participants using existing infrastructure. No new West <br />Slope infrastructure would be needed to divert or convey <br />water to the East Slope. <br />Prepositioning would involve the use of available Adams <br />Tunnel capacity to deliver C -BT water into Chimney Hollow <br />Reservoir to occupy storage space that is not occupied by <br />Windy Gap water. The delivery of C -BT water from Granby Chimney Hollow Reservoir Site <br />Reservoir into Chimney Hollow Reservoir would create <br />space for Windy Gap water in Granby Reservoir. When Windy Gap water is diverted into Granby Reservoir, <br />the C -BT water in Chimney Hollow Reservoir would be exchanged for a like amount of Windy Gap water in <br />Granby Reservoir. Total allowable C -BT storage would not change and the existing C -BT diversions would <br />not be expanded. If operated in this manner, Chimney Hollow Reservoir would be full most of the time. <br />Alternative 3 <br />Alternative 3 is a combination of a 70,000 AF Chimney Hollow Reservoir on the East Slope and a 20,000 AF <br />Jasper East Reservoir on the West Slope (Figure ES -4). A new, 1- mile -long pipeline would connect Jasper <br />East Reservoir to the existing Windy Gap pipeline that delivers water to Granby Reservoir. The Willow <br />Creek Pump Station, forebay, and portions of the canal and pipeline would be relocated. The availability of a <br />new West Slope reservoir would allow water diversions from the existing Windy Gap Reservoir to be <br />delivered to either Jasper East Reservoir or Granby Reservoir. Thus, when Granby Reservoir is full or the <br />Adams Tunnel is at capacity, Windy Gap water would be diverted and stored in Jasper East Reservoir until <br />there is sufficient capacity to transfer water to Chimney Hollow Reservoir. <br />Alternative 4 <br />Alternative 4 is a combination of a 70,000 AF Chimney Hollow Reservoir on the East Slope and a 20,000 AF <br />Rockwell/Mueller Creek Reservoir (Rockwell Reservoir) on the West Slope (Figure ES -4). Deliveries to and <br />from Rockwell Reservoir would require a new connection to the existing Windy Gap pump station and a new <br />3.3- mile -long pipeline to Rockwell Reservoir. As with the Jasper East Reservoir site, the availability of a <br />new West Slope reservoir would allow water diversions from the existing Windy Gap Reservoir to be <br />delivered to either Rockwell Reservoir or Granby Reservoir. When Granby Reservoir is full or the Adams <br />Tunnel is at capacity, Windy Gap water would be diverted and stored in Rockwell Reservoir until there is <br />sufficient capacity to transfer water to Chimney Hollow Reservoir. <br />ES -6 <br />
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