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including the Edwards Aquifer. The GBRA continues to be the focus for meeting the water needs of the area. In February 1987, the GBRA published a report entitled Alternative Source Yater Supply Study which evaluated several alternatives for providing treated water to many of the smaller municipalities and districts in the region. This study concluded that a plant located at San Marcos and using water from the San Marcos River was the most cost effective alternative for providing potable water to the City of San Marcos and many other ci ties in the region. Additionally, a plant at San Marcos with an intake at Gruene, Texas and a raw water supply pipeline to transport Canyon Lake water to San Marcos was the second most cost effect i ve approach to providing potable water to the area. Information from the GBRA report was used in the preparation of this study. 2. New Braunfels Utilities provided to the City of San Marcos, cost estimates for building a plant in New Braunfels with a pipeline to San Marcos. These costs have been reviewed for this study and additional project costs developed for comparison with the original estimates. 3. A Yater Master Plan was prepared for the City of San Marcos in 1983. Information in this report has been used for the preliminary sizing of pipelines, pumping and storage facilities, and treatment units. C. COST COMPARISONS 1. Separate costs were developed for the proposed alternatives of building a water treatment plant at New Braunfels and conveying potable water to the San Marcos system. Previous estimates assumed transfer to an intermediate storage tank located on high ground near the Kohlenberg Lane area from the existing New Braunfels distribution system. Following review, it was concluded that a separate dedicated pipeline should be provided from the plant to the intermediate storage reservoir to assure a more reliable source, independent of the New 4