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<br /> ¡(,f) <br /> Raw Water Line Evaluation - <br /> 1.2.23 Prepare an evaluation of potential routings for the raw water line from the San Marcos <br /> River to the water treatment plant site on SH 621. Evaluate various pipe sizes based on initial <br /> construction cost, power usage, easement requirements, and need to parallel the line in the <br /> future. Make recommendations for easements using information from the Hays County Appraisal <br /> District, including permanent and temporary easement widths. If the CITY should decide to <br /> withdraw water from either Canyon lake or the Guadalupe River, the scope of this task will be <br /> renegotiated. <br /> - <br /> 1.2.24 Prepare and sub[11it a Draft Technical Memorandum for CITY and Project Manager <br /> review, and a Final Technical Memorandum describing the results of these evaluations. <br /> Water Treatment Plant Evaluation <br /> 1.2.25 Provide an evaluation of various treatment processes, including (1) high rate <br /> sedimentation processes such as solids contact clarification, tube or plate settlers, and absorption <br /> clarifiers, (2) conventional flocculation/sedimentation, (3) conventional dual media filtration with <br /> air scour and rate of flow controllers, (4) constant rate deep bed filters with varying depth and <br /> influent flow splitting, (5) declining rate constant head filters, and (6) GAC filters. Evaluate the <br /> impact of more stringent federal or state water quality regulations on the plant layout. In <br /> evaluating various treatment processes, the level of operator training and size of operations staff <br /> will be considered. <br /> ~ <br /> 1.2.26 Provide an evaluation of several primary disinfectants. The evaluation will assess (1) <br /> suitability of different disinfection chemicals for the San Marcos surface water, (2) ability to <br /> comply with the concentration/contact time (CT) requirements of the Surface Water Treatment <br /> Rule and the Enhanced Surface Water Treatment Rule, and (3) compatibility with the current <br /> groundwater disinfectant. Chlorine, chloramines, chlorine dioxide, and ozone will be evaluated <br /> as primary disinfectants. <br /> 1.2.27 Visit up to three water treatment plants in Texas over a two day period to inspect various <br /> treatment processes, chemical feed methods, plant layouts, instrumentation and control <br /> equipment, staffing requirements, etc. The cost of transportation and lodging for up to four (4) <br /> personnel from the CITY is included. . <br /> 1.2.28 Based on the recommended treatment process, develop various basin and building <br /> configurations and layouts including varying number and size of sedimentation basins and filters. <br /> Evaluate various chemical feed alternatives including bulk liquid storage, day tanks, and different <br /> types of chemicals. Evaluate the layout of the high service pump station and clearwell including <br /> constructing a concrete clearwell with the high service pumps mounted on top of the basin, <br /> constructing a separate pump station building, or locating the pumps inside the plant building. <br /> 1.2.29 Develop an overall master site plan outlining the overall development of the plant. Space <br /> will be reserved for future treatment options such as membrane filtration, ozone generators, or <br /> granular activated carbon filters. <br /> 1.2.30 Evaluate various architectural concepts, however, no specific architectural renderings or <br /> layouts will be developed. <br /> Page 5 <br /> eontractlmsclsanma reo/6000 1 OO/ag reement <br />