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1 <br /> r <br /> • The following list outlines the primary limitations of DPE for remediation of sites contaminated with <br /> r VOCs <br /> • Less cost-effective for permeable soil types <br /> • Operating costs may be high depending upon blower horsepower requirements and groundwater <br /> treatment requirements <br /> • Short-circuiting of airflow from the surface may limit effectiveness <br /> I <br /> 4.7 RECOMMENDATIONS <br /> 1 <br /> DPE capitalizes on synergistic effects produced by simultaneous lowering of the groundwater table and <br />' increasing extraction well vacuum Use of DPE for remediation of contaminated sites is most <br /> advantageous for sites contaminated with volatile compounds and with moderate to low hydraulic <br />' conductivity soils The presence of existing monitoring wells in strategic locations may provide an <br /> opportunity for minimizing system capital costs through conversion of the wells for extraction DPE can <br /> be a cost effective method of rapidly remediating both soil and groundwater contaminated with VOCs <br /> rThis technology provides for the remediation of the vadosc zone, capillary fringe,smear zone, and existing <br /> water table by extracting both water and air through the same borehole <br /> r � <br /> Before a DPE system is implemented,efforts should be undertaken to assess groundwater and soil <br /> characteristics and project objectives to determine which type of DPE is appropriate for the site Any <br /> patents that may apply to the technology should be thoroughly researched, and,if necessary,the <br /> ' appropriate licensing and fees should be assessed and included in the project cost estimate <br /> 1 <br /> 1 <br /> 1 <br /> . 4-20 <br /> 1 <br /> r <br />