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. ~ ''',', - - ~b... 'j and to address concerns related to maintaining the ability to divert water to the West Pueblo Ditch. Pueblo Board of Water Works 17 CFS Raw Water Releases From Pueblo Reservoir The Construction Alternative is not anticipated to have any impact on the Pueblo Board of Water Works' 17 cfs raw water releases from Pueblo Reservoir for two reasons. First, when a release from Pueblo Reservoir is made for Pueblo West, only a corresponding quantity of water will be diverted from the river, Second, releases for Pueblo West and the Pueblo Board of Water Works' 17 cfs raw water releases would typically occur during different seasons. The facilities to be constructed under the Construction Altemative are largely for the purpose of meeting summertime demands, while the l7 cfs raw water releases are anticipated to occur primarily in winter months. Pueblo West's plans for stabilizing the diversion structure have not been finalized, although they are not anticipated to have any long-term impacts on downstream flows because the proposed stabilized structure will essentially replicate the existing structure. Short-term impacts during stabilization of the structure could potentially have an impact on the Pueblo Board of Water Works' releases. To minimize any potential impacts, the following mitigation is recommended: · Pueblo West will coordinate all construction and maintenance activities associated with the proposed action with the Pueblo Board of Water Works. Every effort will be made by Pueblo West to conduct construction activities at a time and/or in a manner that has no impact on the Pueblo Board of Water Works ability to convey water down the Arkansas River below Pueblo Dam and divert water to either the Comanche Pump Station or the Whitlock Water Treatment Plant. No activities shall be permitted to occur until written notice has been provided by the Pueblo Board of Water Works indicating that they are aware of the request to proceed with work and concur with the timing of the work and measures to minimize the impacts. . Pueblo West shall allow the Pueblo Board of Water Works to review any design plans that involve the stream channel, streamside or diversion structure at least 60 days prior to planned construction, Every effort will be made to modify the plans if needed so that the structure does not impact the Pueblo Board of Water Works conveyance of water down the Arkansas River below Pueblo Dam and diversion of water to either the Comanche Pump Station or the Whitlock Water Treatment Plant. Water Oualitv The Construction Altemative is expected to have some potential to have temporary impacts on water quality. Construction activities would be anticipated to increase the potential for erosion runoff and in-channel soil disturbance that could degrade water quality temporarily. The following mitigation measures will be required to minimize these impacts. · Pueblo West will use appropriate Best Management Practices (BMPs) during all ground- disturbing construction and maintenance activities to minimize erosion runoff. 13