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<br />Metropolitan Water Supply Investigations - Phase II Plan of Study <br />8/16/94 5:04 PM . <br /> <br />Page 2S <br /> <br />Determine an economics-based methodology for screening potential uses of <br />effluent which considers the costs of treatment, storage, conveyance, etc, <br /> <br />Identify potential envirorunental impacts (including possible endangered <br />species issues) of possible effluent management schemes with respect to macro <br />issues (depletions to Nebraska) and site-specific issues (wetlands, water <br />quality, instream flows through Denver, etc.). <br /> <br />This sub-task will focus primarily on effluent management opportunities in the <br />metro Denver area and on the mainstem of the South Platte River from <br />Chatfield Reservoir downstream to the Big Thompson River. The <br />investigation will also identify possible opportunities on South Platte River <br />tributaries in this reach. However, these investigations will be limited to <br />opportunities on Bear Creek, Clear Creek, Big Dry Creek, and lower Cherry <br />Creek (below Cherry Creek Reservoir). Effluent sources may include treated <br />water discharged from one or more of the following treaunent plants: Metro; <br />Broomfield/Big Dry; Englewood/Littleton; Centennial; Glendale; <br />Coors/Golden; Northglenn, and Wesuninster. <br /> <br />b) Approach <br /> <br />Using the results of Task 4, compile information on effluent supply and <br />existing and potential uses into an analytical baseline presentation. List the <br />general categories of sources of effluent to be considered (e.g. treaunent plant <br />discharges, urban drainage, lawn watering return flows, etc.). Determine, <br />quantify, and characterize current and future effluent sources in terms of <br />flow, water quality, timing, and flexibility of timing. Define existing <br />Burlington system and the Consolidated Ditches operations and their <br />respective calls on upstream metro area municipal diversions. Identify existing <br />decreed and undecreed exchanges involving effluent and existing constraints <br />on the use of such exchanges. Present underlying assumptions. <br /> <br />Identify and quantify potential uses for effluent (potable, non-potable [not <br />including agriculture), e.g, Burlington), exchange/substitution, augmentation) <br />and the timing of potential uses. This will include identifying the role of <br />storage (both surface and alluvial groundwater) in managing the timing of <br />reusable effluent delivery (effluent banking) or augmenting the use of <br />nonreusable effluent. Both upstream (above Metro) and downstream (below <br />Metro) storage and the effect of diurnal streamflow fluctuations below Metro <br />will be considered. <br />