Laserfiche WebLink
110131:1121 1 IM <br /> 111J! <br /> Natural Degradation <br /> Oft <br /> The concentrations of dissolved hydrocarbons in ground water will decline over time due <br /> to natural degradation and dispersion. If sources of additional hydrocarbons (including <br /> 4% leaky tanks and soil with residual hydrocarbons) are removed, natural degradation may <br /> reduce dissolved hydrocarbon concentrations to acceptable levels. Periodic monitoring of <br /> the groundwater quality and gradient can be implemented to verify the rate of degradation. <br /> H <br /> It is possible that the rate of natural degradation of dissolved hydrocarbons will be <br /> accelerated by the effects of a soil vapor-extraction system. If the current hydrocal.)on <br /> concentrations in ground water are relatively low, this alternative may be applicable at the <br /> site. <br /> e4 '. <br /> Cost Estimates <br /> Preliminary cost estimates for soil and ground-water remediation systems are presented in <br /> Table E-:I. These estimates are based solely on our understanding of the site and other <br /> broadly similar situations. They should not be construed as actual budgets or estimates of <br /> the costs for implementing the programs at this site. Accurate estimates of costs will be <br /> f <br /> prepared when additional information becomes available regarding site characteristics and <br /> feasibility of the various programs. <br /> A)7P1Zed G&OSysteMS <br />