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<br /> Task 410. List Transport/Treatment Alternatives. <br /> In a brainstorming session involving the City, all possible <br /> permutations of transport of wastewater in sewer or force mains and <br /> treatment plant sites will be listed. These alternatives may include <br /> inter-basin flow transfer; consolidation, abandonment, or new sites; <br /> land irrigation treatment of wastewater and/or sludge; flow <br /> equalization; etc. <br /> These alternatives will be evaluated to select several <br /> practical alternatives with the best chance of implementation. These <br /> "few best" alternatives will be described, and a copy of the alterna- <br /> tives to be evaluated in more detail will be sent to the City. <br /> Task 420. Analyze Existing Sewerage System. <br /> The existing trunk sewer system, including pump stations and <br /> force mains, will be analyzed, utilizing a computer program, to <br /> determine carrying capacity. The maximum carrying capacity of each <br /> reach of trunk sewer and each pump station will be tabulated. The <br /> capacity of existing treatment facilities, derated if necessary to <br /> meet effluent limitations, will be given. <br /> Task 430. Analyze Alternatives and Propose Improvements. <br /> - <br /> A hydraulic analysis using computer modeling, of each of the <br /> "few best" alternatives, will be undertaken using the design flows <br /> generated in Task 390. Ini tially, the facilities necessary to satisfy <br /> conditions at the end of the selected design period will be analyzed <br /> for each alternative. The relief trunks, sewer extensions, and pump <br /> station and plant additions will be shown. Existing facilities will <br /> be incorporated into the program to the greatest extent practical. If, <br /> after review of the design year facilities, it appears that phasing of <br /> trunk line construction is justified, it may be desirable to repeat <br /> the analyses using interim design year flows. Facilities n~cessary in <br /> each phase of expansion will be described. <br /> Task 440. Cost Alternatives. <br /> A preliminary opinion of probable cost of each alternative <br /> will be made, taking into account phased construction, if necessary. <br /> 22 <br />