Laserfiche WebLink
I <br /> After technical problems have been identified and resolved, a preliminary design of a j <br /> potential treatment system can be accomplished The preliminary costs of a potential <br /> treatment system can be compared to other groundwater treatment alternatives <br /> Finally, nontechnical considerations, such as the length of time of remediation, can be <br /> considered concurrent with technical feasibility and potential project costs <br /> 2.3.3 Air Sparging <br /> Air sparging may be considered a form of in-situ air stripping combined with in-situ <br /> bioremediation A similar evaluation of subsurface characteristics and conditions as <br /> those to be assessed for in-situ vapor extraction and bioremediation must be <br /> undertaken Pilot testing similar to that recommended for vapor extraction may be <br /> performed to obtain system design parameters Air sparging consists of injecting air <br /> into the saturated zone via wells As the air bubbles move through the aquifer, <br /> dissolved contaminants volatilize into the unsaturated zone where they may be <br /> allowed to dissipate or removed by soil vapor extraction The aeration of the aquifer <br /> also encourages in-situ biodegradation of contaminants Inorganic nutrients or <br /> additional micro-organisms may be injected to enhance biodegradation Additional <br /> subsurface conditions such as lateral and vertical permeabilities, pH, and other factors <br /> will have also been determined to be suitable for in-situ bioremediation This <br />' technique may be limited by subsurface heterogeneities and aquifer material of low <br /> permeability Also, air sparging may induce off-site migration of vapors or <br /> groundwater Therefore, monitoring wells and/or vapor extraction maybe required to <br /> control and monitor contaminant movement <br /> As with other groundwater remediation alternatives, once technical feasibility has been <br /> demonstrated, a preliminary design of a potential system may be undertaken At that <br /> point, initial project costs and nontechnical considerations can be reviewed and the <br /> desirability of air sparging versus other remediation alternatives may be evaluated <br /> I <br /> 6 <br /> I <br /> I <br /> 6 <br /> I <br />