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'."1 ""J " ':~}" ;J :"1 ;'J ~"l '.A 'O}l ,':" J I ;J .'.:: ;;'.-1 .~ -1 .t_, Li ..-.. .~,) _',1 ""1 ,-J .,: : ;~ 'J j c-'l ...., .~~ ~~.~ ~~ . :..~ 1998 report to the RIO Grande Compact Commission Bureau of Reclamation The project continued flow-through operations at San Luis Lake during 1998 with 3,173 af delivered to the lake through San Luis Lake Feeder Canal. Natural flows into the lake were estimated to be 1,545 af as measured at the San Luis Lake Parshall flume and estimated at the spillway and culverts. During the year, 2,038 af was pumped from the lake. In May 1998, Reclamation initiated a review and analysis of historical data related to drawdown. The purpose of the drawdown study is to analyze project deliveries and resulting water table levels, agricultural usages and potential impacts on water table "evels, weather patterns, and historical trends in recharge. The study is looking at pre- and post-project time periods. The draft study report is scheduled for completion in May 1999. At the May 14, 1998 Closed Basin Operating Committee meeting, discussion continued regarding the allocation of project water for mitigation during years of project yield shortfall for Priority I and II water requirements. The committee recommended that mitigation deliveries would be calculated based on mitigation due to construction impacts and pumping impacts. Mitigation water deliveries to the Blanca Wildlife Habitat Area included the annual mitigation delivery of 800 af and a Colorado Division of Wildlife transmountain substitution delivery of 713 af. A Reclamation team for responsible National Fish and Wildlife Foundation Grant Projects (NFWF) proposals, recommended funding for construction of the Blanca Wetlands Siphon under the canal at Stanley road crossing. An agreement for the project was signed by Commissioner Eluid Martinez on February 19, 1998. Completion of this structure will deliver water to improve aquatic habitat for native wildlife and fish and establish 8 acres of wetlands within Reclamation right-of-way. In cooperation with the U.S. Geological Survey's (USGS) Pueblo Colorado Office, Reclamation is continuing to review quality control of its observation well network. The Alamosa Field Division's Operations Team accomplished phase two of a three- phase project which will complete the migration from VAXNMS to NT/Oracle for the upgrade of hardware and software of the Programmable Master Supervisory Control (PMSC) system. The PMSC system is used to operate the network of production wells, observation wells, and structures of the Closed Basin. In October 1998, a contract was awarded to evaluate well biofouling treatment methods. Under this contract, five salvage wells were treated and a great deal of useful information was obtained. As results of the treatments, increases in specific capacities of the wells ranged from 17% to 60%. The knowledge gained from the contract will be used to prepare another contract for additional well remediation. Operational changes -3-