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<br />R. G. OTTO & ASSOCIATES <br />~:+: <br />3. COTTER/USGS SURVEY OF CHANGES IN WATER QUALITY <br />ASSOCIATED WITH THE WASTE ROCK PILES. <br />Backorouadc The second, principal source of information oa the <br />impacts of the waste rock piles on the water quality of Ralston <br />Creek is a survey conducted jointly by Cotter and the U.S. <br />Geological Survey. This survey had as a goal, the quantification <br />of annual cycles of water quality/chemistry for the stream. The <br />lield element of this program was initiated is Map 1982; and <br />concluded in September 1984. Data collected includes sir series <br />o! intensive samplings for an erteasive suite of parameters at <br />~?v <br />three locations is Ralston Creek. These samplings were cued to <br />seasonal hydrologic (runoff) cycles and were complimented by <br />continuous monitoring of stream flow, pH, conductivity and <br />dissolved oxygen concentration as well as a sampling program to <br />track dissolved and suspended solids concentrations. <br />The initial design of the stream survey program did not take into <br />account possible impacts of the waste rock piles on stream or <br />ground water quality. The original survey design calleci for <br />sampling at four locations: (1) a point well upstream of the Miae <br />(upstream of both the Miae discharge point and waste rc>ck piles), <br />(2) the discharge from the Mine water treatment plant, (3) at a <br />~~ point approximately 1/2 mile downstream of the dischare~e and (4) <br />'~~ <br />at the juncture of the stream with Ralston Reservoir. <br />13 <br />