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a <br /> Harding Lawson Associates <br /> Disposal costs associated with the active extraction system can <br /> i .; not be projected at this time because of the uncertainties of the <br /> volume to be produced. <br /> 4. on-site activated carbon treatment with dischar a to <br /> the storm Sewer sv stem - This alternative involves the t <br /> reatment <br /> P ' <br /> on site of hydrocarbon-laden ground water with a liquid-phase <br /> 4� activated carbon process prior to discharge into the storm sewer <br /> f, <br /> system. As discussed earlier, an NPDES permit would be required. <br /> : <br /> This alternative will be considered only if the quan}i_ <br /> ' J ties of water generated during� J�J er g g ground-water remediation are much r <br /> larger than' currently projected; such <br /> �- quantities may result if an <br /> } <br /> 1 active ground-water withdrawal system is in o_,eration. A deci- <br /> sion regarding the implement%:tion of this alternative will be <br /> n <br /> made duringi <br /> start-up of ground-water remediation. If chosen, a <br /> ' ' <br /> � <br /> cost estimate will be� Prepared at that time=.. <br /> S. Soil f <br /> 1. Na acon - The no-action alternative involves leaving <br /> 1 ti � <br /> soils with detectable concentrations of gasoline hydrocarbons in <br /> place while implementing a method for controlling further migra- <br /> tion of contaminated ground.water. - costs associated with this <br /> f , <br /> ._.,.._ :alternative can not be estimated 'at this time. <br /> _.. _.....- - <br /> b.n` <br /> 2. est 'cte <br /> ex::avation - This alternative involves <br /> j <br /> FJ combining limited excavation plus off-site disposal with the nc- ` <br /> s <br /> g } action alternative. Under this alternative, soil outside the <br /> g footprint a€ the convenience store would be excavated; treated <br /> and disposed of at a licensed landfill. Soil beneath the store <br /> .,, <br /> 23 <br /> �tl� <br />