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In addition, two springs (Lux Springs) with flows of 0.4 and 0.7 ft3/second are <br />present in the southeast 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 ;1/_44e Williams Fork <br />Mountains. <br />Although this section has identified groundwater disc rge points which are of <br />concern in an evaluation of waste disposal hydrolo 'c impacts, these discharge <br />points are not likely to be impacted, since the mo ement of contaminated ground- <br />water from the disposal area is not expected to ccur as is evident from the dis- <br />cussion under "Potential for a Leachate [o Oct r." If a leachate did occur, the <br />data indicate its progress would be very ow 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 thr ugh overburden and waste) are compared to <br />applicable water quality standar s and concentrations within the potentially <br />affected groundwater. Column d a are for a 1:4 mass ratio of waste to overbur- <br />den. Pit bottom disposal is s mulcted by placing all overburden above the waste. <br />Spoils bench disposal is si ulated by "sandwiching" waste in the center of the <br />overburden. Spoils trough disposal is simulated by placing all overburden below <br />the waste. Column co centration data are the maximum output concentration <br />observed and the aver a concentration (total mass of each constituent leached <br />from waste%total vo ume of leachate produced). The eight parameters were <br />selected using com risons of maximum column concentration data with water qua- <br />lity standards. my these eight parameters significantly exceeded standards. <br />The chemical c aracteristics of the leachate generated in the laboratory studies <br />do not repre ent the expected average concentration of waters which percolate to <br />the water t ble and recharge groundwater since a significant portion of percolat- <br />ing water will not have contacted waste material and waste to overburden ratios <br />in actual disposal may vary from the 1:4. <br />4-95 <br />