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I• <br />The patents al effects on the rater quality will be estimated an the basis of controlling <br />chemical reacts one, by analysing the spoils-water chemi stry at Nuela, and by aDPT scats on <br />of a methodology duvet oped by Hounslow, et al. (1978, pp. 177-780). <br />The aDpli cats one of the geochemf cal apeclati on code PHREEOE to the study of water <br />chemi atry at Nuele and Nuela East has been previously di scuased. Tha study resulted to <br />several pertSnant concl usS ans. <br />7. The major ion chemistry is rnntrolled by the solubSli ti ea of gypsum and calcite. <br />2. Concentrati ens of tedmi um and iced appear to be controlled by the solubilities of <br />otavita e~W cerrua4ta, respects vely. Local excaedences of ths Ort nkS ng Mater <br />Standard for cadmS um have been nosed. The standard nay naturally be exceeded for <br />lead as rail, but the laboratory analyses are 7n douht. <br />3. No mineral ogle controls were apparent for boron or nitrate, or For conatS tuents whose <br />concentrations rare tesa than their detects on limits. <br />• 4. Evan though the chemi atry oT the rater ;s largely eantroll ed Dy equi li 6ri um wf th a <br />few mf narela, there fs va ri ability to water chemistry, probably because of <br />differences in a xater'a history and degree of mixing With other rater. <br />5. A¢Sdie problems should De naturally ameliorated by mixing of aoidic water xSth the <br />no re preval ant Ca-Hg-504 water, and by reacts on wSth cal eSte. <br />The concentrations of ei ements or Iona that era controlled by mineral saiubtlitles era not <br />expected to change yreatiy because of mining. The geochemical analysis which was <br />parfornad provides iw dafi nt ti ve information on specs ea which are likely to be affected by <br />sorpttgn or ion exchange, such as boron. <br />Nounal Ow at al. (1978) developed a technique for predicting whether mining would 1l kely <br />cause changes in water quality, based on hydrol ogle settings, exl sti ng water quality, and <br />core properties. Following this methodology (coal bal aw or to aquifer, TDS greater than <br />1,000 mg/1, and the widespread occurrence of Ca-Ng-504), mining is not likely to cause a <br />\ change in the rhemistry of the water. <br />17-58 Revised 04/17/88 <br />• <br />REVISED MARCH 2006 Attachment 2.05.6(3}2-68 <br />