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REMEDIATIOM ALTERNATIVES <br /> In-Situ Vapor Extraction Soil Remediation System <br /> EVAX has developed a comprehensive vapor extraction process that can be <br /> used on site to remediate soil that has been contaminated by a variety of <br /> fuels and solvents. The process is dependable, affordable, and creates <br /> minimal impact on daily business operations. The extractithe soil n can be <br /> achieved under existing structures and pavements, further, <br /> cleaned on site, rather than being excavated and transported to a <br /> hazardous landfill . <br /> i <br /> The process entails installation of temporary vapor extraction probes at <br /> ified depths for use as extraction points. <br /> specified locations and to spec <br /> 3 The probes are installed using pneumatic equipment. In addition, <br /> existing groundwater monitoring wells are retrofitted for use as <br /> extraction points. A network of underground piping is installed to <br /> connect the extraction points to the system equipment. Sail gases are <br /> extracted from the extraction points and routed through the underground <br /> piping to the system equipment villere the hydrocarbons in the extracted <br /> air stream are abated. The extracted air stream is then disbursed to the <br /> atmosphere. The system operates 24 hours per day, seven days per geek <br /> until the remediation objectives have been achieved. The system is <br /> monitored and adjusted on a regularly scheduled basis to maximize system <br /> operation efficiency and ensure that system operation is within permitted <br /> emission conditions. <br /> Based on an extrapolated average vapor conof centration of 10,000 ppm with a <br /> flow rate of 100 cf-n, approximately 160 pounds stage <br /> of vapor extraction <br /> petroleum hydrocarbons <br /> would be removed daily during the initial stage <br /> system operation at the site. It is estimated that average soil <br /> hydrocarbon vapor concentration would decrease to less than 6,000 pp <br /> within several weeks. Removal would be approximately 96 pounds of <br /> petroleum hydrocarbons per day at this time. <br /> Passive biological degradation of the gasoline hydrocarbons will occur <br /> simultaneously with vapor extraction. Bioremediation of the gasoline <br /> hydrocarbons will occur as a result of an enhancement of the activity of <br /> the indigenous microbe population due to the aerobic environment created <br /> by vapor extraction. No active bioremediation techniques will be ; <br /> employed during the vapor extraction process. - <br /> Throughout the process, reports are generated to define the extent of <br /> contamination, monitor the progress of the clean-up provide data needed to maintain air quality standards, and comply with regulatory agency <br /> _ - . requirements: EVAX systems..conform to state and federal regulations and <br /> �. <br /> J - 7 - <br />