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This comparison shows Chat average column leachate concentration for most of the <br />• key parameters and disposal options are above average groundwater concentrations. <br />This fact reflects Che high local groundwater quality. However, most leachate <br />concentrations are below water quality criteria. Barium exceeds existing ground- <br />water quality for all disposal options, but does no[ exceed water quality cri- <br />teria. Aluminum is below water quality criteria. Boron leachate concentrations <br />are well above existing groundwater concentrations for all disposal options ,. and <br />boron also exceeds water quality criteria. Chromium exceeds existing groundwater <br />for all options, but does not exceed criteria. Molybdenum pit bottom and spoil <br />bench leachates exceed existing groundwater quality, while spoil trough leachate <br />is about equal to existing groundwater Levels. Molybdenum leachate exceeds water <br />quality criteria. Sulfate spoil trough leachate exceeds existing quality and <br />water quality criteria. Vanadium leachate concentrations are well above existing <br />groundwater quality but in spoil trough leachate, it is about equal to water qua- <br />lity criteria. Manganese spoil bench and spoil trough leachates exceed existing <br />groundwater quality and water quality criteria. <br />~• In summary, the column leaching studies indicated that if a Leach ate occurs, only <br />boron and molybdenum concentrations would exceed existing groundwater quality and <br />water quality criteria for all disposal options. Sulfate and manganese with <br />spoil trough disposal and manganese with spoil bench disposal would likely exceed <br />existing groundwater quality and water quality criteria. <br />Of the six potential "problem" parameters described in Section 6.5, only mangan- <br />ese column leachate concentrations exceeded background groundwater quality. <br />Minimizing Potential for Ground [Dater Contamination <br />Trapper :fine's disposal plan for utility castes will minimize the potential for <br />ground water contamination to result. Since it is unlikely that contamination <br />would occur from natural percolation and leaching, the primary concern of dis- <br />posal will be to prevent contact of the waste body with ground water. As dis- <br />cussed in Section 4.8.2, it is possible that the loaner ends of the pits (north <br />ends) will accumulate ground water with a resulting increased elevation of ground <br />-~, • water in those areas. Such sites are unsuitable for utility waste disposal with- <br />~"'~ out costly engineering controls. It is possible however, [o anticipate a maximum <br />a-97 SE.P 2 1992 <br />~-e-sz <br />