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<br />Brad wanted to know how Russell George's 3-14-05 scoping comment that WQ impacts <br />need to be addressed based on the operations plan would be addressed in the WQ <br />analysis. Rick said that the Corps recently received the revised Water Users' operations <br />plan. Gary indicated that the operational plan will be used to identify worst-case <br />scenario(s) to compare to existing operational conditions. Andrew Parker added that the <br />maximum volume would be considered the worst-case scenario. Brad commented that <br />the timing and duration of pool fluctuations may contribute more towards worst-case <br />conditions than maximum pool. Dave Jensen responded that the worst-case scenario is <br />expected to involve the maximum volume held throughout the summer recreation season, <br />because stratification could increase anoxic conditions and result in increased phosphorus <br />and metal concentrations. He thought that fluctuations in lake elevations when the lake is <br />less than 12 feet above 5432 feet msl would have less effect because the volume of <br />anoxic water would be less than what occurs at the maximum volume. Kevin Urie noted <br />that due to the dilution factor, increased volume could actually improve WQ in terms of <br />some parameters. Dave replied that is true for some parameters because the analysis <br />assumes that future external loads (except from bird droppings) will be the same as <br />current loads; however, the WQ analysis will determine whether increased volume more <br />than offsets any increased internal loads from anoxic bottom water, vegetation inundation <br />/decay, etc. <br /> <br />It was recognized that the analyses had many data needs, and the WQ analysis would be <br />completed approximately I to 2 months after all data was received. CW A's data is <br />available on the CW A website, to which Andrew has access. Wildlife censuses have <br />been conducted and may be available from the Audubon Society and Ray Sperger. Jim <br />Smith indicated that CD OW conducted a census of overwintering waterfowl after fall <br />migration and that a non-government organization may have data on Canada geese that <br />are resident at Chatfield during the recreation season. Brad said that boating activity and <br />intentional hazing have not driven the Canada geese away from the shallow water areas at <br />Chatfield. It was agreed that data on shorebird use of the shallow water and <br />mudflatlbeach areas was also needed. <br /> <br />No future conference call was scheduled. Marty and Gary will summarize the WQ <br />analysis proposal at the October 6,2005, meeting with the Water Users and the Colorado <br />Water Conservation Board. <br />