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I I I I I I I I I I I I I I I I I I I o 00 113 ....... . entity, The consuming State entity will develop a contract right to a quantity ofICUA for future use, The pattern of water deliveries through the CAP may require minor adjustments to accommodate the storage of water that will be used in Arizona when a California or Nevada entity requests lCU A, When water is moved through an existing conveyance system and into a permitted storage facility, as part of its review ofa SIRA, Reclamation will determine what NEPA compliance has been accomplished for those facilities, analyze potential impacts, and determine the appropriate NEP A compliance documentation, Later, the storing State entity will reduce its Colorado River water diversions to allow the consuming State entity in another Lower division State to divert and use lCUA from the Colorado River. Reclamation understands that when an authorized entity in Nevada diverts and uses a quantity ofICUA., the water will be delivered through existing delivery facilities, Before water is diverted through an existing conveyance system under a SIRA, Reclamation will determine what NEP A compliance has been accomplished for those facilities, analyze potential impacts, and determine the appropriate NEP A compliance documentation, The A WBA has access to sufficient off stream storage capacity to offer some storage capacity in existing sites to authorized entities in California and Nevada under a SIRA (Arizona 1996, ARS 1996, AWBA 1997). However, offstream storage in Arizona for an authorized entity from another Lower Division State must occur where there is adequate capacity to store the water without needing to develop new storage or delivery facilities, Nevada authorized entities would like to store as much as 1.2 maf at 100,000 af/year over a period of 12 years, which represents about I % of the total average deliveries to the Lower Division States and Mexico over the next 12 years, It is unlikely that Nevada authorized entities will enter into a SIRA to store water for entities from other States due to limited off stream storage capacity in Nevada. The groundwater recharge capacity of existing injection wells in the Las Vegas Valley is approximately 20,000 afper year, The total off stream storage capacity of the Southern Nevada Groundwater Bank is estimated to be approximately 350,000 afNevada entities are expected to use their limited off stream storage capacity to store Colorado River water on their own behalf and not for entities from other States, California entities, who collectively have been exceeding their 4.4 maf apportionment, are unlikely to store water in Arizona until they first ensure that they have adequate water available to meet their immediate demand. It is not known whether State-authorized entities in California will store water in California for another state under a SIRA It is anticipated that any off stream storage in California will be for use in California and not for entities from other States, No Action Alternative Under the No Action Alternative, Arizona will continue to store a portion of its own apportionment off stream through the AWBA and such water will not be available to the other Lower Division States. Nevada's diminishing unused apportionment will continue to be available 13