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<br />'-.'t ". <br /> <br />J.!...- <br /> <br />Table S,3.-Summary Comparison - Viable Alternatives <br /> <br />Canal lining Unlined portion (19.52 miles) of Some reduction or conversion of Greatest beneficial income effects <br /> the Main Canal and laterals persistent emergent wetlands and of the three viable action alter- <br /> (7.21 miles) to be lined with habitat. Potentia] for wildlife natives. Improved water quality, <br /> concrete, clay, or other material. drownings to be offset by escape reduced salinity: 27,700 tons <br /> devices, Slight visual effects. annually @ $36.61/ton. <br /> Possible short-term, minor <br /> population change during <br /> construction. <br />Low pressure Upper section to be replaced with Some reduction or conversion of Salinity reduction of 18,400 tons <br />, pipeline pipeline; a 2,430-kW pumping persistent emergent wetland and @ $84.78/ton. Siphons untested <br /> plant would deliver water through associated habitat. Sligbt visual for bigber pressures. <br /> existing siphons to new effects. <br /> pressurized pipe laterals in new <br /> rights-of.way. <br />High pressure As in low pressure, above, but Effects would be similar to those Salinity reduction of 18,400 tons <br />pipeline 100 feet of pressure would be under the low. pressure @ $104.73/ton. Siphons untested <br /> delivered to laterals, rather than alternative, for higher pressure. <br /> 10 feet, and the pumping plant <br /> capacity would be 3,370 kW. <br />No action No action would be taken to The annual contribution of No additional cost for salt <br /> rehabilitate the Hammond Project approximately 32,000 tons of salt removal, but there would be a <br /> to reduce salt loading to the to the Colorado River system tradeoff in additional costs for <br /> Colorado River system. would continue. A more rigorous salinity damage downstream on <br /> O&M program would have some the Colorado River system. <br /> effect on phreatophytelriparian <br /> areas and habitat. Urban <br /> expansion would occur at some <br /> point, <br /> <br />Significant features <br /> <br />Economic/social <br />or environmental effects <br />(impacts to be offset by mitigation) <br /> <br />Achievementsl <br />other issues <br /> <br />"'" <br />. r..\ : <br />:'\) : <br />Cl! <br />01' <br />,.-. I <br />