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<br />R. G. OTTO & ASSOCIATES <br />~'. <br />o- <br />This initial study design was reassessed by Cotter staff in 1983 <br />in response to concerns expressed by the Water Quality Control <br />Division:staff regarding possible impacts of the waste rock piles. <br />It was agreed that the proposed study design would not adequately <br />define surface or groundwater impacts from the waste rock piles <br />and, in September 1983, two additional sampling locations were <br />included: (1) at a point in the stream between the waste rock <br />piles and the water treatment plant discharge and (2) pit a well <br />drilled downslope of the waste rock piles especially for this <br />purpose. Water Quality Control Division staff partici)>ated in the <br />selection of these locations. <br />'~ Sampling at all six locations (the original four plus i;he well and <br />~' <br />additional stream location) was initiated in September 1983 and <br />concluded in September 1984. This report includes onl;~ that <br />information from the Cotter-USGS survey that is pertinent to the <br />evaluation of waste rock pile impacts. <br />Parameters Measured: The element of the Cotter-USGS st;ream survey <br />relating to the waste rock pile assessment includes coi:sideration <br />of sixteen (16) parameters (Table 2). These parametersc weze <br />selected is consultation with the Water Quality Contro]. Division <br />staff and include a series of three general water quality <br />descriptors (conductivity, pH and sulfate concentration) as well <br />as 13 trace metals thought to be characteristic of the highly <br />mineralized deposits is the Ralston Creek watershed. <br />14 <br />