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Surface Water Classification and Associated In- Reported Ground Water Quality <br />Stream or Drinking Water Standards �'� Properties in Ogal2ala�Formation - North <br />(chronic) = 0.01 /�g/I (total) <br />Nickel (acute/chronic) = TVS <br />Selenium(acute/chronic} = NS (dissofved 50 <br />Silver (acute) = NS <br />Zinc (acute/chronic) = TVS <br />Dissolved selenium: <5 Ng/1 <br />Dissolved Zinc < 5-124 <br />1. Stream classifications and water quality standards obtained from a report by David Litke, U.S. Geological Survey, and <br />Historical Water-Quality Data for the High Plains Regional Ground-Water Study Area (1930 — 1998) or from <br />CDPHE/WQCC — Colorado Primary Drinking Water Standards. <br />2. Blanks indicate data that were not reported in the reference. <br />3. Reported ground water quality data is from Litke, USGS (see Note 1). <br />Volatile organic compounds and pesticides in the ground water in the project area are <br />below concentrations in Colorado's drinking water standards based on the references <br />cited in the footnotes to the above table. Thus, the water quality of ground water being <br />considered for the Compact Compliance Pipeline is appropriate for delivery to the North <br />Fork of the Republican River to offset stream depletions. <br />4.4. Outlet Structure <br />The Compact Compliance Pipeline will deliver water to the North Fork of the Republican <br />River as needed to meet Colorado's compact obligations. <br />Several locations for discharging water to the North Fork were considered. A discharge <br />location in the Town of Wray would provide some aesthetic benefits to the town; <br />however, stream channel losses and the presence of surFace diversions befinreen Wray <br />and the state line would reduce the delivery credit for water for compact compliance. <br />Therefore, it was decided that the point of discharge to the North Fork should be as <br />close as possible to the state line and at a location that does not require crossing of the <br />railroad and highway rights-of-way. The discharge location is shown on Figure 2. <br />Because water delivered to the North Fork will be measured a short distance upstream <br />from the stream gage on the North Fork near the state line, this alternative provides the <br />most certainty that the RRCA will give full credit for water delivered by the Compact <br />Compliance Pipeline. <br />Several types of discharge structures could be used; however, the most cost-effective <br />discharge structure would be a USBR-type reinforced concrete impact basin, sized for <br />the expected peak water delivery rate. This structure will effectively dissipate energy <br />over a wide range of flows and allow for gravity operation of the main pipeline. <br />4.5. Pipeline Alignment <br />There are several potential alignments for the main north-to-south pipeline, depending <br />on topographic, land use, land ownership, and access considerations. The final pipeline <br />10 <br />