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v"" .-' ,',.) J.,....'J ~) Five to six test wells will be drilled and pumped during 1979 to gather ,C,'" ~ additional hydrological and biological data. These wells will be capable of being developed as project production wells. Data from these test wells and previous studies will be used in a GS ground water simulation model to more accurately determine aquifer characteristics and the design of future production wells. As production wells are completed and pumped, upgraded aquifer characteristics will be obtained for designing well fields. The effects on wetlands and terrestrial vegetation caused by lowering of the water table will be investigated. As discussed later in section A-4 on stage development, the development of the well fields will be a step-by-step, four-stage process, extending over about 10 years. Under this procedure, information gathered during installation and production of wells in one stage will be used in the projection of aquifer response for the next stage and subsequent well ,field design. Proposed well spacings, designs, and capacities based on information from the preceding stage would be modified to accommodate the subsurface variations encountered during testing in the next stage. (2) Monitoring system--A monitoring system will be estab- lished to assure that the water table outside the project area will not ,be drawn down more than 2 feet, as provided in the authorizing legislation (Public Law 92-514). Ground water levels will be monitored by a system of observation wells located inside the project area, around the perimeter of the project area, and at various distances outside of the overall project area. Frequent measurements of the depth to ground water will , be made at these wells before, during, and after construction to insure that pumping will not adversely affect water levels outside the project area. There are approximately 118 existing observation wells in which ground waters are periodically ~easured in and adjacent to the project area. These observation wells are: No. of wells Measuring agency 19 U.S. Geological Survey 8 Rio Grande Water Conservation Dist. 91 U.S. Bureau of Reclamation Measurement frequency Aquifer measured every 3 months unconfined ~. ;- every month , . unconfined every 2 weeks 67 in unconfined 24 in confined To augment the data from these existing wells, a control system incorporating additional observation wells will be installed prior to the commencement .> . A-8 . . . ., . . . . Ii . . . . . . , .. II *' fI -