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.;._ <br />,~ ~ <br />c~vrro wATEa QtrAt,ITr <br />Well water quality has been monitora9 on the Bourg property, on <br />a quarterly basis, since Novanber, 1980. Initial disturbance of <br />this property began in July 1980 with actual m;n;nq activities starting <br />in September of that year. Due to the lack of baseline data, it has <br />been necessary to compare trends in water quality on the upstream side <br />of the property (well 33C) with the quality of water leaving the property <br />(well 30A). Table Sb shows the range in values for all measured para- <br />meters for both wells, as well as various stan~~**~G which have been set <br />for these parameters. <br />Water in well 30A has been consistently harder than that in well 33C. <br />It is felt that this is a result of natural conditions rather than <br />m; n;nq activities for two reasons. First, the water in well. 30A <br />has been harder than that in 33C since mine operations began. <br />Secondly, well 30A has not, for the most part, shown a greater increase <br />in the monitored parameters over time than well 33C even as mining <br />activities advance toward Mann Draw. <br />Higher levels of boron, potassium, and SAR have been recorded <br />arning onto the Bourg property than in well 30A. Well 33C once <br />exceeded E.P.A. and Colorado Department of Health standards for <br />boron. This problem was corrected to some degree, before the water <br />left the property. <br />Iron and manganese levels have remains well below MLR and NPD'cS <br />standards, however, an increase in manganese has been noted for well <br />30A and will be watched. The pH of the water owning onto the <br />property exceeded the MLR standard of 9.0 once, but had decreased <br />to below that level before it left the property. <br />Three additional parameters will require additional observation. <br />Cadmium is increasing toward the E.P.A. standard for aquatic life <br />and the Department of Health limit for agricultural water. Magnesium <br />levels apcr to be increaseing in well 30A and calcium levels are <br />increasing in both wells. Them are no standards set for either of <br />these elements. These parameters will be carefully observed for further <br />changes. <br />I-32 <br />