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CNAPTERFOUR Enuironmenta~ Consevuences A pipeline breach neaz a stream or drainage crossing could result in contamination of surface waters. However, there is little potential for a breach to occur as described in S~:ction 2.2.2. The pipeline pressure would also be monitored to detect any potential leaks. It is unlikely that any significant impacts to surface water quality would occur. Parachute Site No surface water drainages have been identified on the Parachute Site. A stormwater retention pond would be located neaz the southeast corner of the site to collect runoff. The four ponds located on the site would be constructed with a double liner and leak detection system, and with adequate freeboard similaz to the Piceance Site pond to prevent overtopping. No adverse effects to surface water quality are anticipated. The Unocal facility has two water supply systems in place. One from four wells located on the plant property and the second is the river withdrawal facility on the Colorado River south of the town of Parachute, Colorado. Both systems would be reactivated and maintained. No major modifications to the systems aze planned beyond reinstalling the pumping and electrical equipment, and site cleanup. The existing water rights would allow water for thy: project to be taken from the Unocal wells (alluvial) on Parachute Creek during much of the tune. If a call is placed on Pazachute Creek, water would be taken directly from the Colorado via the existing intake and pipe system. The consumptive use of Colorado River water for the process water supply could contribute to a depletion in the river system and may effect the endangered fish species in the Colorado River. Refer to Section 4.10.2.1 for discussion on potential impacts to Colorado River fish. The Proposed Action would have no adverse effects on the quality of the Colorado River. 4.3.2.2 Accelerated Development Alternative Potential effects to surface water quality would be similar to those described for the Proposed Action. Temporary increases in sedimentation from ground disturbing activities may be more pronounced due to the greater area of exposed soil at any given time. The consumptive use of water for production and processing would increase to approximately 3,475 acre-feet per yeaz, resulting in a greater depletion to the Colorado River to be mitigated with the U.S. Fish and Wildlife Service (USFWS). 4.3.2.3 No Action Altemative The No Action Alternative would have no effect on surface water resources. 4.3.3 Mitigation and Monitoring No additional mitigation or monitoring is recommended. 4-12 Surface Water and Surface Water Drainages