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'[JIIlJ020 use habits in order to secure additional ,later supplies for suburban residents is an unresolved question \'ihich needs to be addressed, SUCCESSIVE USE Subject to legal and economic conotraints, the successive use of Denver's tral"]sr;]ountain \'laters may be accomplished by both exchange operatIons and the development of potable reuse, To the extent that river operating conditions allow, the D\'ID l'lay exohange tran8!lountain return flo\'is for dO\'ffiotream rights and divert additional South Platte ,<aters at its upstrea~ intw:e facilities. The DvlD, in cooperation "nth the U.S. Environmental Protection Agency, is impl~~enting a $29 million, 7-year project to demonstrate \1hether hi~1 quality lvater can be extracted safely, reliably, and economically fren treated sel'lage efflu- ent on a large scale. The reuse plant \'lOuld treat 1 million gallons of se':Iage effluent daily. If the absolute dependability of the reuse process is established-- and later instituted on a fUll-scale basis-~etropolitan Denver's potable ,later supplies could be increased after the year 2000. Pro,ject Alternatives - Several nonpotable reuse alternatives such as dual. systems, one ,nth fully treated water and the other reuse water, and fUll-scale J industrial and irrigation uses of reuse water have been identified. The only projects identified arD imple~ented to date are small-scale park and golf course irrigation uses. S1P-AIGHT CREEK COllECTION SYSTE'~ 'Ihis project is planned by the DI-JD to divert I;ater from Strai["pt Creek near the diversion faCility of the old Oro Grande No.2 Canal in Summit County. Diverted waters would flo'l by gravity to Dillon Reservoir. Project Alternatives - No major project configuration alternatives have been identified to date for this project. EAST GOPE COllECTION SYSTEN This project, also located in Summit County, is p12.nned by the DWD to divert water from tributaries of the Blue River along the east side of the Gore Range and to convey it through a gr2,vi ty flO\'I system to Dillon Reservoir. Pro,ject Alternatives - Project configuration alternatives identified to date center around the use of pumpinG facilities to collect the waters from the portion of the project vihich lies vdthin the Eagles Nest Wilderness Area. 4