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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 />(Figure ES -7). This would increase the potential for exceedance of the maximum weekly average <br />temperature standard under all alternatives. <br />Figure ES -7. Colorado River predicted average daily stream temperatures for July 25 assuming <br />diversion to the 90 cfs minimum instream flow below Windy Gap Reservoir. <br />20 - - - -- - - - -- — -- - - -- - - <br />18 - - — <br />16 Granby _. _..- --- - -- - - -- - - - - - - -- -.t. <br />Reservoir <br />t j 14 - - -� <br />Muddy <br />N 12 --- --- - - - -- __ - -- _. - - -- _.. --- Troublesome <br />M 10 <br />Q. $ <br />Alternative 1 <br />No Action <br />Alternative 2 <br />Proposed Action <br />Alternative 3 <br />Windy Gap <br />£ <br />Total phosphorus (µg/L) <br />Reservoir <br />F- 6 <br />-- - -_ Willow — -- <br />+3.2% <br />+1.6% <br />Creek <br />+0.3% <br />4 - <br />- � Fraser River <br />2 <br />-3.5% <br />Chlorophyll a (pg/L) <br />0 <br />+2.4% <br />No Change <br />No Change <br />No Change <br />0 <br />5 <br />10 <br />HSS ree n <br />a <br />Creek l3lue River <br />WWTP _ -- <br />Williams Fork <br />15 20 25 <br />River Mile (mi) <br />— Existing Conditions h <br />—No Action <br />— Proposed Action <br />— Alt3 <br />— AM <br />— Alt5 <br />30 35 40 45 <br />Ammonia and inorganic phosphorus concentrations in the Colorado River are predicted to increase <br />and dissolved oxygen (DO) concentrations decrease under all alternatives. Water quality standards <br />would not be exceeded under average flow conditions, but when Windy Gap diversions reduce flow <br />to the 90 cfs minimum flow, the DO concentrations is predicted to be less than the spawning standard <br />for a few miles upstream of the Williams Fork. <br />Ammonia and some metal concentrations in Willow Creek would increase slightly for all alternatives, <br />but water quality standards are not expected to be exceeded. <br />Total phosphorus concentrations in Granby Reservoir are predicted to increase under all alternatives <br />and total nitrogen concentrations would increase under the No Action and Proposed Action <br />alternatives (Table ES -4). Alternatives 3 to 5 would have lower nitrogen levels due to the effects of <br />storage in a West Slope Reservoir prior to delivery to Granby Reservoir. Chlorophyll a <br />concentrations (algae) are predicted to increase under the Proposed Action, but there would be no <br />Table ES -4. Granby Reservoir predicted water quality changes by alternative compared to existing <br />conditions. <br />Parameter <br />Alternative 1 <br />No Action <br />Alternative 2 <br />Proposed Action <br />Alternative 3 <br />Alternative 4 <br />Alternative 5 <br />Total phosphorus (µg/L) <br />+6.3% <br />+12.7% <br />+4.0% <br />+3.2% <br />+1.6% <br />Total nitrogen (ltg/L) <br />+0.3% <br />+0.7% <br />-2.1% <br />-2.8% <br />-3.5% <br />Chlorophyll a (pg/L) <br />No Change <br />+2.4% <br />No Change <br />No Change <br />No Change <br />Peak chlorophyll a (pg/L) <br />No Change <br />-1.5% <br />No Change <br />No Change <br />No Change <br />Secchi -disk depth (m) <br />No Change <br />No Change <br />No Change <br />No Change <br />No Change <br />Trophic state <br />No Change <br />No Change <br />No Change <br />No Change <br />No Change <br />Minimum DO (mg /L) <br />-2.2% <br />-4.4% <br />No Change <br />No Change <br />No Change <br />TSS (mg/L) <br />No Change <br />+4.3% <br />+4.3% <br />+4.3% <br />+4.3% <br />ES -12 <br />
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