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flow rate of 100 to 150 cfm. It is expected that the carbon beds will adsorb about 4 to 5 <br /> • gallons of gasoline before breakthrough. Regeneration of the twin beds will undoubtedly <br /> be required on a weekly basis initially. Although the effectiveness of the venting process <br /> decreases somewhat during the winter months, it is expected that initial start up will begin <br /> immediately after construction of the vent system is complete, possibly by December 1, <br /> 1990. The process will continue until the concentration of gasoline in the soil has been <br /> reduced to below 100 ppm of total petroleum hydrocarbons. <br /> • <br /> • <br />