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GENERAL31841
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Last modified
8/24/2016 7:54:44 PM
Creation date
11/23/2007 7:06:42 AM
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Template:
DRMS Permit Index
Permit No
M1999002
IBM Index Class Name
General Documents
Doc Date
7/22/1999
Doc Name
FINAL ENVIRONMENTAL IMPACT STATEMENT VOLUME 2 APPENDIX L
Media Type
D
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(Rifle to Pazachute) might be expected to hazbor lazger fish less susceptible to potential <br />impacts attributable to the river intake. <br />Presuming there is future potential for spawning of razorback and pikeminnow in this reach, <br />entrainment of drifting or less motile larval forms by this intake system would probably be <br />unavoidable. In speaking with Tom Nester (CDOVI~, recent studies on the Green River <br />suggest that dispersal of larval fish is passive, random, and more or less evenly distributed <br />across a channel cross-section-thus entrainment or impingement losses would tend to be <br />proportional to diversion volumes. <br />Razorback larvae could first appeaz in drift by mid-April and, assuming a s)~awnittg site were <br />situated neaz Rifle (17 unites upstream and the presumed uppermost distribution of listed <br />endemics), the latest fry would pass beyond the inlet azound mid-July (asstuming they travel <br />about 1 mile per day, Tyus and Karp). In the event larval entrainment were proportional to <br />flow and applying average monthly flows (period of record:1966-1997) from the USGS <br />Colorado River @ Del3eque station, an average 0.05 % mortality attributable: to the inlet <br />structure would be experienced in April and 0.01-0.02% May through mid-:fuly. As later <br />spawners, pikeminnow larvae would be subject to lower flows (July through mid-September) <br />and potentially greater mortality from entraitment, 0.02% in July and August and 0.08% in <br />the first half of September. Entrainment ratios would likely become increasingly pronounced <br />the more closely spawning activities occurred upstream of the intake. <br />Bishop-Brogden Associates, a water tights engineering fu-m retained by American Soda and <br />previously associated with the Unocal operations, provided the results of a water availability <br />analysis based on American Soda's water right priority and prospective yield of their well <br />field. Although this analysis was subject to the normal range of uncertainties associated with <br />annual precipitation patterns, river flow, and the exercise of senior water rights, it provides the <br />best figures presently available concerning the frequency and timing of American Soda's <br />direct river withdrawal. <br />It is anticipated that the alluvial well field in the Parachute valley can provide virtually all of <br />American Soda's mine and processing water 19 of every 20 yeazs. In that dry yeaz of 20, and <br />based on the driest yeaz on record (1977), the well field would be capable of providing <br />sufficient water during 7 months (approximately 58% of the yeaz: November-March and May- <br />June); water would be removed directly from the Colorado River (through the intake facility) <br />during the remaining months (approximately 42% of the yeaz: April, July-October). During <br />average years, American Soda's water tights should remain in priority through most, if not all <br />the irrigation season. Depending on actual water use of senior water rights holders in the <br />Pazachute system and runoff regimes in Parachute Creek, the well field rights may be out of <br />priority during the later part of the irrigation season (i.e., September, October). Any process <br />water needs that cannot be satisfied from the well field during these times will be drawn from <br />the river withdrawal system. <br />Based on this information, razorback larvae would be most vulnerable to entrainment <br />mortality during the last 2 weeks of April (at least 0.05% level) and the fur~t 2 weeks of July <br />(at least 0.01% level) in about one of every 20 years. Colorado pikeminnow would be subject <br />to entrainment through out their entire larval drift stage in the driest yeaz of 20 and perhaps <br />for intermittent periods during September of "normal" flow years. <br />
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