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4 <br /> J. H. KLEINFELDER & ASSOCIATES <br /> i <br /> ENVIRONMENTAL SCREENING <br /> t.N This technique imposes no known adverse environmental or public health <br /> i - <br /> impacts. Due to the mixed results observed at other sites, however, <br /> environmental and public health protection cannot be assured. <br /> f_ <br /> s. ST SCREENING <br /> Capital and O&M costs are perceived to be relatively high. This is due <br /> ! (in part) to resource availability, expensive start-up cost, and the fact <br /> t .F <br /> that this is an emerging technology. <br /> I <br /> !'# 3.6.2 AIR STRIPPING <br /> :.e The treatment of hydrocarbon contaminated ground water by air-stripping <br /> has been proven to be an effective remedial method. This process relies <br /> E: on the aeration of contaminated water through "transfer units' that <br /> partition water and vapor phases (see Figures 3.6.2 and 3.6.3). The <br /> effectiveness of this technique depends primarily on the volatility of the <br /> contaminant. System performance increases in direct proportion to <br /> increasingly volatile contaminants. <br /> ' Properly designed packed air stripping towers have been shown to be highly <br /> effective. These units can achieve 90-99% removal of volatile organic <br /> compounds (VOC's) from water. The performance of the air stripping <br /> technique is influenced by: <br /> o ground water quality <br /> o water and air flow rates <br /> a amount and type of packing <br /> 0 overall tower height <br /> o number of towers <br /> 33-87-887 14 <br />