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rs•. YY� -r-fi �a25- :,tea _ _ �. xr, 4'b� ',w^.Fwa�K_ :$}p'.+.ra -"ev.u�iJ+rwwr>." '_�4 .., . r s}��'t��t.',-.`�.z'd�„ 7.r-v ,&.�•..afS`,s �r-;�;�.3.E,.�,=�,��'�.§�r'� .i <br /> ii <br /> r 4 <br /> r� aquitard separating zones 3 and 5. Wells which were formerly <br /> screened across the aquitard separating zones 3 and 5 allowed a <br /> it small amount of contamination to reach zona 5. -Zhena cross- <br /> connected wells have been removed. <br /> k Raz� �l 7rtanHecMMendg&tiqn <br /> Soil contamination is confined to the area where hydrocarbons <br /> h P' have trickled clown to the 4aater table. Groundwater is affected <br /> in a plume oriented northwestward and southeastward from the tank <br /> Pit area. The most appropriate remedial action for this site, <br /> given thy_ permeability of the zone 3 aquifer and the presence of <br /> <; <br /> 14 hydrocarbon metabolizing microorganisms, is the implementation of <br /> an in sxr bioreclaaation program in zone 3 in -onjunction with <br /> the current groundwater and free product' recovery system. This <br /> program will require the addition of trace amounts of inorganic <br /> nutrients to the groundwater to increase the metabolic rate of <br /> naturally present substr2ace microbes. , Soil and water analyses <br /> have confirmed that hydrocarbon metabolizing microorganisms are <br /> present. Because contamination of zone 5 is apparently minor, it � <br /> isorecommended to remediate zone 5 by recovering groundwater and 1 <br /> passing it through the existing air stripper. # <br /> fry <br /> s <br />