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'�---. :,u w ;=.g 1 `- ,e�,- ' v ., <br /> ;F3 .� ' ri #', ';:w „F.�zFw .»`.(��"a <br /> a <br /> � <br /> �'�x3r�T.*�” Iw+�e`Jd;w rvr•� F.. <br /> i <br /> T� ISI <br /> f <br /> Lammersville School District 2021899-7004 <br /> July 16, 1990 19 <br /> No-Action Advantages <br /> 1. No site disruption. <br /> 2. Law cost for implementation. <br /> No-Action Disadvantages <br /> 1. 9equires an extended time frame to complete, <br /> 2. Higher costs for added monitoring. <br /> 3. Possible off-site migration. <br /> Because of the potential for off-site migration,the no-action option will not be pursued at this time. <br /> 9,2 GROUNDWATER EXTRACTION AND TREATMENT <br /> The remedial action of groundwater extraction and treatment involves the installation of a recovery <br /> well to pump groundwater to the surface for treatment prior to discharge(to the sanitary or storm sewer <br /> system) or re-infiltration. The pumping action creates a cone of depression that hydraulically controls <br /> migration of hydrocarbons in the water and induces flour toward the well. Discharge of the treated water <br /> in an upgradient well or gallery can enhance this movement. Treatment options for the extracted water <br /> would depend on the rate and degree of treatment required, but would typically consist of air stripping, <br /> carbon adsorption,or biological treatment. The advantages and disadvantages of groundwater extraction <br /> and treatment are outlined below: <br /> Groundwater Extraction and Treatment Advanta es <br /> 1. Logistically simple to install with minimum interference to land use. <br /> 2. Petroleum hydrocarbons would be removed from groundwater. <br /> 3. Proven technology for establishing hydraulic control. <br /> 4. If biological treatment is used, hydrocarbons would be destroyed. <br /> S. Moderate installation costs. <br /> Groundwater Extraction and Treatment Disadvantages <br /> 7, Requires permitting for water discharge. <br /> 2. Requires continued monitoring after installation. <br /> v 3. Does not treat petroleum hydrocarbons.in the overlying soil <br /> 4. Moderate to high operation and maintenance costs. <br /> GROUNDWATER <br /> __.._ TECW,'UI.OG},INC. <br />