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<br />will be managed according to BMPs that will be established in the Piceance Site <br />Stormwater Management Plan. It will not be routed to the evaporation pond. <br />Runoff from the Parachute Site processing facility area will be routed to a Stormwater <br />retention pond (described in Exhibit D, Section D.2.4.2). Runoff from other site areas <br />will be diverted to Parachute Creek through an existing drainage system. All runoff <br />will be managed according to the Stormwater Permit and Stormwater Management <br />Plan. The evaporation pond and MVR purge pond at the Parachute Site will be isolated <br />from natural drainages and will be designed to accommodate the 100-year precipitation <br />event. Therefore, these ponds are unlikely to be vulnerable to overtopping. <br />G.4 Project Water Use <br />G.4.1 Water Volume Requirements <br />The Yankee Gulch Project will recycle water, but make-up water will be required to <br />replace some of the water that cannot be recycled. Consumptive water losses will occur <br />at both Sites and will include such things as <br />• water that remains in the solution cavity when it is retired <br />• boiler and cooling tower make-up water that becomes blowdown <br />• various purges from processing equipment <br />• effluent from the water treatment system <br />• evaporative losses from processing equipment <br />• plant water for toilets, sinks, cleaning <br />The project will have an average consumptive water use of about 1.6 cfs (1,158 acre-feet <br />per year). <br />G.4.2 Water Sources <br />Use of Unocal's existing water right would allow process water to be taken from the <br />Colorado River via an existing intake located in the river near the town of Parachute <br />and from alluvial groundwater wells in the Parachute Creek valley. The existing water <br />supply system includes an intake structure, a grit basin, a 6-mile-long underground <br />pipeline, and an existing, lined water storage pond. From the pond, the water will enter <br />the project water treatment plant at the Parachute Site and will then be distributed as <br />required. After being treated to remove impurities, some of the water would be used at <br />the Parachute Site, and the remainder would be added to the recycled water and <br />pumped to the Piceance Site via the return water pipeline. <br />Potable water will be trucked to the Piceance Site and stored in a potable water storage <br />tank. <br />G-11 <br />