Laserfiche WebLink
kn KLEINFELDER <br /> Solving the integral assuming a soil porosity of 0.4 and inputting known quantities: <br /> V = (64ft) (0.4) (3966 ft2) (28 liters/ft') = 8.9e6 liters <br /> f <br /> By this calculation, dividing the oxygen delivered by the volume influenced, in four hours of <br /> f sparging roughly 1 mg of oxygen per liter of groundwater was introduced to the groundwater. <br /> These calculations will be particularly useful for estimating subsurface ozone demands for <br /> oxidation of 1-2 DCA in the full-scale convective action design. <br /> i <br /> 2.3 MW-1 SAMPLING AND RESULTS <br /> In order to test the effect of air sparging on the groundwater concentrations of contaminants of <br /> concern, sampling of MW-1, which Iies within the radius of influence of the pilot test well, was <br /> completed. The results of this sampling are presented in Table 2. The complete laboratory <br /> report is presented in Appendix A. <br /> Table 2: Change In Concentrations of COCs in MW-1 Due to Air Sparging <br /> ;ilm <br /> 4' <br /> Pur eable Hydrocarbons 13,000 19 000 <br /> Benzene 1,800 2,700 .+ 50% <br /> Toluene 1,000 2,100 +210 % <br /> Eth lbenzene 770 750 -2% <br /> ? Total Xylenes 3,000 3,200 + 7% <br /> Tert-But 1 Alcohol ND @ 50 62 X24% <br /> 1 2-Dichloroethane 52 64 23% <br /> i <br /> 12-Dibromoethane ND P, 50 12 NIA <br /> As the results indicate, the concentrations increased in MW-1 from the last quarterly monitoring <br /> round. It is likely that this is due to either seasonal variations in the monitoring well or the <br /> sparging has begun to drive deep dissolved and adsorbed contamination upward and into the <br /> screen interval of the well. <br /> Kleinfelder has speculated that the majority of the dissolved contamination may be significantly <br /> below the current groundwater surface, near the depth of groundwater at the presumed time of <br /> { 122801SAC2R566 Page 6 of 9 November 25,2002 <br /> Copyright 2002 Kleinfelder,Inc. <br />