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'. 7ty. - EXHIBIT C - - rrLB.2 San Marcos "Yater Supply System '" There are currently five wells that supply water to the City of San Marcos water distribution system. The water distribution system is divided into two pressure planes due to the elevation difference across the City, and there are plans to develop a third pressure plane in the' near future (Exhibit A and Figure 1). The five existing wells that supply water to the City of San Marcos water distribution system are located at three locations in the City. One well is located at the standpipe at McCarty Lane, two are located near the Comanche Street Pumping Station, and two ar.e located at the Spring Lake Pumping StatiOIL Therefore, water currently enters and is ciiSpersed into the system at three locations. Water will continue to enter the system at the current locations following development of a surface water supply, but a substantial amgunt of water will be delivered from the surface water treatment plant, and the distribution' system m~t be capable of receiving and distributing the water from the surface water treatment pl3J;lt. The existing water distribution system is divided into high and low pressure planes at about elevation 750. Ground storage tanks at the Midway and Comanc~e- Pumping Stations along with the Crawford elevated tank: and the McCarty Lane standpipe serve as elevated storage for the low pressure plane. Elevated storage for the high pressure p\ane is provided by the Franklin standpipe and the Alamo elevated tank. Well water pumped into the ground storage tanks at the Midway and Comanche pumping stations and the M<:CartY Lane standpipe are directly available to. the low pressure plane. The high pressure plane-is supplied by the high service pumps at the Midway and Comanche pumping stations. A surface water supply system is being plarmed by the City. The surface water treatment plant will be located on the southeast side of the City in the low pressure plane (Figure 2). Following implementation of the surface water supply system, the function of the main lines in the low pressure system will change somewhat. Currently the lines must convey water away from the Midway and Comanche groun{Ï storage tanks and the McCarty l.aÌ1e standpipe to points of demand and to the Crawford elevated tank; upon implementation of . the surface water supply system., the transmission lines will sometimes be conveying water to the Comanche and Midway tanks so that surface water can be pumped into the high pressure plane. The water dis~ribution system at the system extremity nearest to the propose~ location of the water treatment plant is fairly strong. Certain major lines in this area of the system are shown on Figure 2. Twelve inch lines run in two directions from the Crawford elevated tank 'Source; Preliminary Engineering Report, Surface \Vater Supply Study, HDR Engineering, Inc., for the City of San Marcos, Texas, October, 1994. C-l