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<br />sediments:and sedimentary rocks of the river aquifer between the northerly international
<br />boundary and the Chocolate Mountains and between the Gila and Laguna Mountains, (2)
<br />prepare milPsand associated geographic information system coverages that show the
<br />river-aquifer boundary, geology, and study-area boundary to match the maps created for the
<br />area upstream from Laguna Dam, and (3) prepare a USGS Water-Resources Investigations
<br />Report that documents the data collected, interpretation of those data. and the method proposed
<br />for the Yuma area and prepare a USGS Fact Sheet on the Yuma method. The study began in
<br />July 1997; The project was expanded in 1998 to include the drilling of 11 test holes to provide
<br />data in southwest Imperial County. California. and near Dome, Arizona.
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<br />FIELD S~REENING OF WATER, BOTTOM SEDIMENT, AND BIOTA ASSOCIATED
<br />WITH IRiRIGATION DRAINAGE IN THE YUMA PROJECT AREA, ARIZONA
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<br />In response to concerns expressed by the U.S. Congress, the U.S. Department ofInterior began
<br />a program; in late 1985 to identify the nature and extent of irrigation-induced water~quality
<br />problems that.might exist in western states. Water, bOllom sediment, and biota were sampled
<br />during 1986-87 in the lower Colorado River valley north of Yuma. With the exception of
<br />selenium, no inorganic constituents exceeded any existing standards, criteria, or guidelines for
<br />the protection of fish and wildlife resources. During the last several years there has been
<br />increasing coricern about the quality of irrigation drainage waters in the Yuma Valley, Arizona.
<br />and its potential to cause harmful effects on human health, fish, and wildlife. In 1995, the U.S.
<br />Geological Survey collected and analyzed surface water and bOllom sediment and the U.S. Fish
<br />and Wildlife Service collected and analyzed biota from 9 sites in a Department of Interior
<br />sponsorediirrigation project, the Yuma project area. Measurements of water and air
<br />temperature, specific conductance, pH, and alkalinity in water were made on site. Water
<br />samples were analyzed for concentrations of major ions, nitrite plus nitrate. and selected trace.
<br />metals. BOllom sediment and biota were analyzed for selected trace metals and pesticides.
<br />Analyses for the water, bottom-sediment, and biota samples are available. The following report
<br />was published in December 1997: Tadayon, Saeid, King, K. A., Andrews, B.J., and Roberts,
<br />W.P., 1997.Field screening of water quality, bOllom sediment, and biota associated with
<br />irrigation ~rainage in the Yuma Valley, Arizona, 1995: U.S. Geological Survey
<br />Water-Resources Investigation Report 97-4236, 42 p.
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<br />GRAND ~ANYON MONITORING OF STREAMFLOW, WATER QUALITY, AND
<br />SEDIMENT
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<br />Monitoring and research on the Colorado River during FYl998 conducted by the USGS for the
<br />Grand CaJ)yon Monitoring and Research Center included steranflow and sediment monitoring
<br />from Lees Ferry to Diamond Creek, sand deposition monitoring along the mainstem of the
<br />Colorado River in Marble Canyon, water-quality monitoring along the mainstem from Glen
<br />canyon dain to Diamond Creek, and productivity measurements in the tailwater reach below
<br />Glen Canyon Dam. Three of the Colorado River streamflow stations operated as part of this
<br />program iilclude water-quality instruments that measure specific conductance, water
<br />temperature, and turbidity.
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