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<br />Section 309 Stndy Advisory Gronp <br />October 28, 2002 Meeting Summary <br /> <br />. <br /> <br />The meeting began with Carl Norbeck providing a recap of the Study efforts to date, The group was reminded <br />of the number of issues that must be addressed over the: next year; it will not be possible to discuss every issue <br />in as much depth as everyone would like, Therefore, there will not be any further Advisory Group discussion <br />of the need for refmed recreation uses, but the Division will accept written comments on that issue. <br /> <br />The discussion at this meeting focused on the following question: <br /> <br />What distinguishing features of Colorado's waters need io be taken into account when <br />considering whether to modify the CUlTent classifications and standards system? <br /> <br />Sarah Johnson presented a number of graphical and statistical representations of the variety of water bodies in <br />Colorado. The Division is working on getting these in ~ format for the web site, <br /> <br />The group then identified the following distinguishing features: <br /> <br />. Large seasonal variations in flow and temperature. <br />. Variations in flow based on location and precipitation. <br />. Irrigation runoff dependent streams in addition to effluent dependent streams. <br />. Bank storage dependent streams, <br />. Headwaters state, <br />. Non-native flow from transbasin and non-tributary waters. <br />. Ephemeral/intermittent streams. ' <br />. Unique geological features, i.e. marine shales, <br />. Naturally occurring nutrients, i.e. natural background, <br />. Different chemical composition of streams, specifically hardness, alkalinity and TDS, <br />. Receiving streams that can be toxic to aquatic life per WET testing criteria, <br />. Variability in biological diversity. <br />. Regional temperature differences, <br />. Hydrologic modifications <br />o Diversions <br />o Augmentations <br />o Dams <br />. Effluent dominated or dependent waters. <br />. Difference between free flowing streams and regulated streams, <br />. Different source waters, i.e. snow melt vs. spring fed <br />. Water uses that vary by season. , <br />. Significant variations in aquatic and riparian habitat - by season and location. <br />. Drought/flood/fire are common. <br /> <br />. <br /> <br />. <br /> <br />45 <br />