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. PROBLEM ASSFSSMENr FIEPWr <br /> INCLUIXN3 QUARn MVIl'M4NM111N6 AFFONT <br /> 13999 East Yosemite Avenue,Mattleca,CoIHorsJa <br /> 1 <br /> treatment equipment. Collection of additiontern.optimalgystem. The water and soil <br /> ubsurface components <br /> ( necessary for the design and installation of <br /> of a venting system were installed by a previous consultant and additional design features <br /> may be manifolded into the existing components. ThE:time-frame far the soil cleanup and the <br /> t <br /> restoration of the aquifer may take l yea <br /> anothe design specifiears. The cation <br /> conceptual d the costs alength ofnvolved ftime <br /> soil/groundwater venting system <br /> the system will be utilized. <br /> 5,S in Situ Bioremediation of Soil and Groundwater <br /> c The treatment involves <br /> a This remedial action alternative involves <br /> to oaltand new technology. <br /> enhance the degradation <br /> the addition of nutrients and/or oxygen <br /> of hydrocarbons by naturaVly-occurring soil microorganisms. Detailed information would need <br /> b <br /> of <br /> acquired regarding hydrogeologic parameters and groundwater quality. This remedial <br /> action alternative would involve detailed agnal welks analysis <br /> would also serve he installation <br /> lstinnjection wells. The <br /> groundwater monitoring wells. The additioil <br /> injection and monitoring of nutrients and engineered microbeinto tf a�° 0 3 groundwater <br /> r <br /> would be required. The time <br /> for such a project mayrequire <br /> s . <br /> 5.6 Selection of a Remedial Action Alternative <br /> ew of <br /> ected <br /> Based on the alternatives discussed ri�id remedial action alternativesthe d erred feabackgroundsible far the site la a 1) <br /> environmental r=gulations,th <br /> apor/groundwater extraction and treatment and 2) in-situ bioremediation of soil and <br /> groundwater. Further evaluation will be performed prior to the selection of a remediation <br /> v <br /> design, and equipment operation and maintenance procedures <br /> action alternative. Selection, <br /> will be presented in a Fina! Remediation Plan (FRP). <br /> 6.0 SCHEDULE <br /> problem assessment report and the selection of a remedial alternative, <br /> Upon approval of the p <br /> l Aegis will prepare a FRP. Aegis will proceed with work outlined in the workplan, pending the <br /> approval of the FRP by the regulatory agencies. <br /> f� <br /> � c <br /> s l <br /> t� <br /> --------- — —-- — — —--..-- -------- -- <br /> eo.098C.aRr <br /> 4 <br />