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Revised LFR Levinelnckel <br /> remediation, The oxidation mechanism resulting from ozone (03) m water is the <br /> hydroxyl free radical (OH) formed by the reaction <br /> rt , 03 + H2O --> Oa + 2OW <br /> a <br /> v The OH- generated by these reactions is a very powerful oxidant, second only to <br /> fluorine m omdwng power Oxidation of an organic compound such as PCE by OH- is <br /> rapid and exothermic, typically taking place in a few minutes in the subsurface, ozone <br /> - >s unstable and naturally decomposes rapidly to produce water and oxygen <br /> Mineralization of PCE by ozone can produce both cWonde ions (Cl-) as well as <br /> - hydrogen toms (H+). The potential impacts on groundwater duality from the chermcal <br /> reaouons regwre evaluation and testing <br /> Spargurg has Limitations, due to the effective permeability of the saturated soil While <br /> ozone sparging is a promising technology, its application m soil such as those within <br /> the Lodi, California area has not been evaluated. <br /> 3.2.3 Sparging Radius of Influence <br /> - The radius of influence is the distance over which measurable changes in groundwater <br /> quality are attributable to the sparge point The radius of influence is used to calculate <br /> the number of sparge powts required to remediate a given area of affected groundwater_ <br /> The radius of influence of the pilot scale sparge system will be assessed by monitoring <br /> the geochemical indicators, such as dissolved oxygen (DO), oxidation reduction <br /> potential (ORP) and pressure response in the groundwater <br /> ' In sand with a uniform hydraulic conductivity, bubbles move outwards and upwards at <br /> a maximum angle of approxmistely 45 degrees from the sparge point, when released at <br /> pressures Iess than the formation fracture pressure (Kerfoot 1994) This results in a <br /> linear relationship between the depth of spargwg and the radius of influence. Therefore, <br /> doubling the depth of the sparge diffuser should double the radius of influence in <br /> addition, doubling the sparging pressure should expand the radios of influence <br /> 142 times, as long as the sparging pressure remains less than the formation fracture <br /> _ pressure (Kerfoot 1994) This relationship can be observed through empirical <br /> observations via groundwater sampling and can also be modeled <br /> A mathematical model to estimate the aur sparge zone of mfluence at steady-state has <br /> been developed (Dowler 1997) The maxunum spherical air radius, "lr", is determined <br /> from a pressure balance between the air sparge point and the base of tie sphere The <br /> pressures at these points are essentially equal, since the column of air between the two <br /> pouts is static (no air flow) and exhibits very little head pressure This pressure balance <br /> is expressed as follows• <br /> RS (ft) - (2 35 * Pj -d <br /> %p TVWS-La&mvAsiz3 doe rn page's <br /> 00/60'd S£TOO90602T 01 906V ZS9 OTS 3ADI2ld �?NIAYI ddb ad L£-9T 20, 60 MC <br /> y <br />