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Show Study Unit Design 25 Ground- Water Chemistry Ground- water samples were collected from wells in basin- fill aquifers used for drinking- water supply or from wells in the overlying shallow aquifer that has the potential to recharge the deeper aquifers. Water- supply wells were sampled to assess the water quality of the deeper aquifers in recharge areas across the Great Salt Lake Basins. Monitoring wells installed in the shallow ground- water system in Salt Lake Valley ( including the flow- path study areas) were sampled to determine the effects of land use on water quality. Public- supply wells in Salt Lake Valley also were sampled to characterize the quality of water in the aquifer used for drinking water in an urban area. i. < 50 KILOMETERS EXPLANATION <- Type of sampling site • Ecological, single reach, single year O Ecological, multiple reach, multiple year • Bed sediment and tissue occurrence • Bed sediment and tissue distribution ® Note: Symbol for site may be divided to represent a multiple- type site Stream Chemistry 50 KILOMETERS Stream Ecology Ecological assessments were completed at sites frequently sampled for stream chemistry to define existing biological conditions. Some of the assessments examined multiple reaches of a stream to determine spatial variations in the habitat and community structure. Broad, one- time snapshot assessments ( referred to as synoptic studies) were designed to further examine spatial variability in biological communities. Bed sediment and fish tissue were sampled at selected sites. Surface- water samples were collected monthly from 10 sites on 6 streams to measure quality and to assess the effects of land use and hydrogeologic setting on water quality ( Baskin and others, 2002). Sites 3, 8, and 10 were sampled more often to determine seasonal variability and to test for pesticides and volatile organic compounds. About 100 additional sites throughout the Study Unit were sampled once or twice to further assess the occurrence and distribution of nutrients, pesticides, or trace elements in streams. EXPLANATION I Urban area 70 Monthly sampling site and number 50 KILOMETERS Site number Site name Site type Basin area ( square miles) Site number Site name Site type Basin area ( square miles) 1 Bear River below Smiths Fork, near Cokeville, Wyoming Rangeland 2,444 6 Weber River near Plain City, Utah Mixed/ Urban 2,072 2 Bear River at Pescadero, Idaho Rangeland 3,699 7 Little Cottonwood Creek at Crestwood Park, at Salt Lake City, Utah Urban 36 3 Cub River near Richmond, Utah Agriculture 222 8 Little Cottonwood Creek at Jordan River, near Salt Lake City, Utah Urban 45 4 Bear River near Corinne, Utah Mixed/ Rangeland 7,065 9 Red Butte Creek at Fort Douglas, near Salt Lake City, Utah Forest 7.21 5 Weber River near Coalville, Utah Forest 427 10 Jordan River at Salt Lake City, Utah Mixed/ Urban 3,508 |
