Laserfiche WebLink
<br />R. G. OTTO & ASSOCIATES <br />,~i <br />This report relates to the potential for impacts on the chemical <br />water quality of Ralston Creek as a consequence of the erosion or <br />solubilization of materials from the two, historic was~;,e rock <br />disposal areas upstream of the Mine (Figure 3). Cotter has <br />undertaken a study of this potential pursuant to the <br />specifications of Colorado Waste Water Discharge Permit No. <br />CO-0001294 (April 8, 1982). The Cotter discharge permit for the <br />Mine (Part III, Paqe 15) requires the design and execu~;,ion of a <br />study to define.potential surface and ground water con~bributions <br />of radiological and non-radiological materials from th~a waste rock <br />piles to the stream. <br />qa_''8 <br />`~?'~~ Details of the waste rock pile study were developed through a <br />series of correspondence and meetings between Cotter a~zd the <br />Colorado Department of Health, Water Quality Control Division <br />staffs. A scheduled sequence of sampling for chemical composition <br />of surface and ground waters upstream and downstream o:f the waste <br />rock piles was defined. This sampling encompassed an ,annual <br />climatic/stream-flow cycle and included a comprehensive listing of <br />parameters specified for consideration by the Division. Sampling <br />specifically for assessment of potential waste rock pile impacts <br />on stream water quality was initiated in September 1983 and <br />completed in September 1984. The results of this study are <br />supplemented by data drawn from other, concurrent and I~istoric <br />considerations of stream water quality and waste rock pile <br />characteristics. These complimentary studies were conducted <br />7 <br />