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<br />~" ~~i,t' ~~':- <br /> <br />,. - <br />tr-:: , <br />. '" ,,"fe' ~_';:: <br />; ",c <br /> <br />Lt. Colonel Dorothy F. Klasse <br /> <br />19 <br /> <br />Prior to Animas-La Plata Project <br />Animas-La Plata Project <br />Red Mesa Reservoir <br />Mancos <br /> <br />32.8/ <br />56.0 !;"7.t : <br />1.0 <br />16.2 '" <br /> <br />. <br /> <br />, <br /> <br />124.1 <br /> <br />Total Colorado Depletions <br /> <br />203.0 <br /> <br />Total San Juan River Depletions <br /> <br />649.5 <br /> <br />Return flows from Dolores River Imports <br />Net depletions measures at Bluff Utah <br /> <br />22.0 <br /> <br />6lLS J? <br />"~1.> <br />* San Juan-Chama diversions have historically averaged 104.000 acre-feet for <br />the 1929-1974 period of record: 110.000 acre-feet for the 1925-1985 period <br />of record <br /> <br />Water Dualitv <br /> <br />Water Quality in the San Juan River was described in the Service's January 12. . <br />1995. biological opinion for the Navajo Indian Irrigation Project. <br />Information on existing water Quality in the San Juan River has been derived <br />from data gathered by the Department of the Interior as part of its National <br />Irrigation Water Quality Program investigation of the San Juan River area in <br />northeastern New Mexico (Blanchard et al. 1993) and results from Reclamation's <br />water Quality data for the Animas-La Plata project. <br /> <br />Concentrations of selenium in water samples collected from the mainstem of the <br />San Juan River exhibit a general increase in concentration levels with <br />distance downstream from Archuleta. New Mexico. to Bluff. Utah. (<1 ~9/l to <br />4 pg/l). Tributaries to the San Juan carry higher concentrations of selenium <br />than found in the mainstem river immediately upstream from their confluence <br />with the San Juan: although these levels are diluted by the flow of the San <br />Juan. the net effect is a gradual accumulation of the element in the river's <br />flow as it travels downstream. Increased selenium concentrations may also <br />result from the introduction of ground water to the mainstem of the river <br />along its course. Sediments and biota associated with the San Juan River also <br />. show elevated selenium levels. <br /> <br />The other contaminants of concern are polycyclic aromatic hydrocarbons (PAHs). <br />also known as polynuclear aromatic hydrocarbons (PNAs). PAH compounds may ~.. <br /> <br />~v <br />