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�� -- m •�. .. � � � ,� x—fes, -::� - aK.A x ,`S Z •a"w`Sa a Y2' w &[ t€Frt s 'aka' f (^) 1989 BIO NATIONAL CORPORATION 3 GRGUNDWATSR _4ND SOXI, TR1�4TMENT PROGRAMS From the beginning, we anticipated an in situ treatment program Because of the proximity to buiHings, operations and a heavy equipment loading Lamp. To use other site destructive and business disturbing technologies to reduce the perceived risk level would be self defeating wlier. the mens is there to perlorm with a minimu;n of environmental or human exposure. Common treatment methodologies, under situations where groundwater is impacted, call for extraction, surface treatment and downstream disposal of the treated water, fail to address the soil contRmination and exposure to re-contamination as the water table fluctuates seasonally. A combined treatment program that deals with the problem in situ, as well as extracts the worst groundwater contamination, would be the . preferred program. It is described in general terms ac follows; 3.1 IN SF.TU BIOREMEDIATION AUGMENTED BY VAPOR EXTRACTION TECH- NIQUES The bioremediation program requires the inoculation of the plume with a water based slurry of individually grown, naturally occurring, non-pathogenic, microbes and appropriate nutrients, pH balancers. and surface .active agents to assure soil wetting at law rates of saturat?an. .,The usual fear of regulators is that the moistening of the plume of contamination will drive the plume into the groundwai.er. In this case, the groundwater is already worse than the soil contamination in the immediat, area of treatment. In any case, the microbes are harmless and will digeet Either soil or groundwater contamination at the oil/water interface. To offset this fear, Bio National has incorporated the accepted methodology of vapor extrac_:on into.its is situ program for the ?allowing reasons; 3.1.1 It places a negative pressure on the plume, drawing both vapors and moisture to extraction wells and on to the surface for further ;.; treatment, reinjection and/or dispor,al. 3.1.2 The vapor extraction process provides a heslthy aeration component to the soil for more rapid bioremediation. 3.1.3 The extraction of excess inoculum based moisture from the treatment zone minimizes the extent of groundwater contact where it is not desireebie or perceived as hazardous. 3.1.4 The system is designed with perimeter venting biowells that allow induced aeration; rot,robe inoculation, and auxiliary treatment; such as ozone flushing, prior to or after bio-treatment. (Just such a combination•, recnntly demonstrated the.ability to break do•.:u a wide range of RCRA Iisted organophosphates at a treatment site.) 3 110LT805 .