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of some component required for microbial activity such as oxygen for aerobic <br /> k <br /> bioremediation. <br /> Approximate Cost and Time Frame,. The approximate cost to implement bioremediation <br /> ranges from $10,000 to $100,000 depending on type of monitoring and reporting. The <br /> duration of bioremediation activities may range from 7 to 10 years. <br /> 3.2.4 Containment <br /> Advantages. The installation of a containment system is an effective way to contain the <br /> spread of the contaminates in the groundwater. It is accomplished in a relatively short <br /> period of time, and requires no maintenance. <br /> Disadvantages. Containment at depth is hard to accomplish without using very expensive <br /> installation equipment. For compounds that migrate vertically through the groundwater, <br /> the containment is contingent upon the presence of an impermeable layer at the depth of <br /> the water bearing zone being scaled. <br /> Approximate Cost and Time Frame. The approximate cost to implement containment <br /> includes installation, and monitoring may range from $300,000 to $500,000 depending on <br /> depth of the installation. <br /> 3.3 Selection of Remedial Alternatives <br /> Based on the known extent of the impact to groundwater, it is recommended that a soil <br /> vapor extraction and air sparge system be installed to remove impacted vadose zone soil <br /> and groundwater on the site and prevent the migration of petroleum hydrocarbons from <br /> the site. <br /> 3-4 <br /> ESJ:IE:\USA100651REPORTS\0065P201.DOC-98usg:1 Rev.0,1/26/99 <br /> 20A41-007.001 <br /> I, <br />