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In addition, two springs (Lux Sptings) with flows of 0.4 and 0.7 ft3/second are <br />• present in [he northeast quarter of Section 29. <br />Other potential groundwater discharge points are the Yampa River and the inter- <br />mittent streams which extend northward from the north slope of the Williams Fork <br />Mountains. <br />Although this section has identified groundwater discharge points which are of <br />concern in an evaluation of waste disposal hydrologic impacts, these discharge <br />points are not likely to be impacted, since the movement of contaminated ground- <br />water from the disposal area is not expected to occur as is evident from the dis- <br />cussion under "Potential for a Leachate to Occur." If a leachate did occur, the <br />data indicate its progress would be very slow and the probable dilution that <br />would occur if it entered an aquifer would make its impact negligible. <br />In the following table, 4.3-26, the concentrations of key parameters in the <br />column leachate (after passage through overburden and waste) are compared to <br />applicable water quality standards and concentrations within the potentially <br />• affected groundwater. Column data are for a 1:4 mass ratio of waste to overbur- <br />den. Pit bottom disposal is simulated by placing all overburden above [he waste. <br />Spoils bench disposal is simulated by "sandwiching" waste in the center of the <br />overburden. Spoils trough disposal is simulated by placing all overburden below <br />the waste. Column concentration data are the maximum output concentration <br />observed and the average concentration (total mass of each constituent leached <br />from waste/total volume of leachate produced). The eight parameters were <br />selected using comparisons of maximum column concentration data with water qua- <br />lity standards. Only these eight parameters significantly exceeded standards. <br />The chemical characteristics of the leachate generated in the laboratory studies <br />do not represent the expected average concentration of waters which percolate to <br />the water [able and recharge groundwater since a significant portion of percolat- <br />ing waters will not have contacted waste material and waste to overburden ratios <br />in actual disposal may vary from the 1:4. <br /> <br />4-95 <br />~~~s <br />