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JAN-18-'91 6JED 12:09 I �)AX TECHNOLOGIES TEL NO:43e 7" #496 P15 i REMEDIATION ALTERNATIVES In-Situ Vapor Extraction Soil Remediation System EVAX has developed a comprehensive vapor extraction process that can be used on site to remediate soil that has been contaminated by a variety of fuels and solvents . The process is dependable, affordable, and creates minimal impact on daily business operations, The extraction can be achieved under existing structures and pavements; further, the soil is cleaned on site, rather than being excavated and transported to a hazardous landfill . The process entails installation Of temporary vapor extraction probes at specified locations and to specified depths for use as extraction points. The probes are installed using pneumatic equipment. In addition, existing groundwater monitoring wells are retrofitted for use as extraction points, A network of underground piping is installed to connect the extraction points to the system equipment. Soil gases are extracted from the extraction points and routed through the underground piping to the system equipment where the hydrocarbons in the extracted air stream are abated. The extracted air stream is then disbursed to the atmosphere. The system operates 24 hours until the remediation objectives have been achieved.er da , seVeTheaysystemWeis monitored and adjusted on a regularly scheduled basis to maximize system operation efficiency and ensure that system operation is within permitted emission conditions. Based on an extrapolated average vapor concentration of 10,000 ppm with a flow rate of 100 cfm, approximately 160 pounds of petroleum hydrocarbons would be removed daily during the initial stages of vapor extraction system operation at the site. It is estimated that average soil hydrocarbon vapor concentration would decrease to less than 6,000 ppm within several weeks. Removal would be approximately 96 pounds of petroleum hydrocarbons per day at this time. Passive biological degradation of the gasoline hydrocarbons will occur simultaneously with vapor extraction, Bioremediation of the gasoline hydrocarbons will occur as a result of an enhancement of the activity of the indigenous microbe population due to the aerobic environment created by vapor extraction. No active bioremediation techniques will be employed during the vapor extraction process . Throughout the process, reports are generated to define the extent of contamination, monitor the progress of the clean-up, provide data needed to maintain air quality standards, and comply with regulatory agency requirements , EVAX systems conform to state and federal regulations and all analytical procedures follow Environmental Protection Agency (EPA) protocol . - 11 -