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<br />.~^ <br />- --m,c::ov!;-- <br /> <br />5,600 acre-feet per year with an associated salt load of 31,650 tons per year <br />is part of the total salt load. Other sources include: Hammond Project on- <br />farm sources of approximately 18,500 tons/year; Largo Canyon, <br />17,000 rons/year; Gallegos Canyon, 4,000 tons/year; and unaccounted-for <br />contriburors. <br /> <br />'1 <br /> <br />OBJECTIVES AND INSTITUTIONAL CONSTRAINTS <br /> <br />The primary objectives for this project include the determination of: <br /> <br />sources of salt entering the San Juan River via the Hammond <br />Proj ect, <br /> <br />the most cost effective salinity control alternative to recommend for <br />construction, and <br /> <br />the appropriate environmental mitigation measures to implement <br />with the recommended salinity control alternative (preferred plan). <br /> <br />Some of the potential legal and institutional constraints affecting the study <br />include: State of New Mexico water right administration; the possible use <br />of Navajo tribal lands and facilities for salinity control purposes; the effects <br />of alternatives on wetlands, cultural resources, and endangered species, as <br />detailed in the EA; the potential use of water for Project mitigation; and <br />resolution, mitigation, or litigation concerning refinery contaminants in the <br />project area. <br /> <br />ALTERNATIVES <br /> <br />During the San Juan study, the following alternatives were considered: <br /> <br />lining the Hammond Project canals with such impermeable materials <br />as earth, concrete, or polyvinyl chloride (PVC) membrane; <br /> <br />three pipeline options-placing the existing Hammond Project <br />irrigation system into a gravity-pressurized pipeline, placing the <br />existing system into a pipeline pressurized by electrical-powered <br />pumping, and placing the system into a pipeline pressurized by <br />gravity and fed by diverting Project water out of the Navajo Indian <br />Irrigation Project (NIIP) canal. Low- and high-pressure variations <br />were identified within each of the pressurized pipe alternatives; <br /> <br />no action (the projected future condition without a project); and <br /> <br />land retirement. <br /> <br />From this array of alternatives, some were later eliminated and some were <br />to be reduced in scope, as is shown in the following paragraphs. <br /> <br />S-4 <br />