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• The remediation system will include a 5 hp compressor/blower to provide vacuum on the <br /> • well points set in the ground, twin carbon beds containing a total of about 800 pounds of <br /> carbon, a steam boiler, condenser and gasoline/water separator. The soil venting process <br /> will continue until breakthrough occurs within the carbon beds. At this point the <br /> concentration of gasoline in the effluent air stream from the carbon beds will have <br /> exceeded one percent of the influent concentration and the bed will be shut down to <br /> remove accumulated gasoline. Regeneration will be accomplished by generating steam at <br /> 10-15 PSI from an on-site steam boiler and passing the steam through the carbon beds <br /> where at evaporates off the gasoline. The gasoline and steam vapor mixture would then <br /> pass through a water cooled condenser and then to a separator where pure gasoline would <br /> be removed. The clear water would be recycled to the boiler after passing through <br /> another activated carbon bed to remove any residual gasoline. The equipment to be used <br /> would be trailer mounted and operated manually. <br /> Design of the Venting System <br /> i� <br /> The design and layout of well points for placing a vacuum on the ground is shown in <br /> Figure 1-1. Since site conditions consist of 10 feet of fine sand underlain by 5 feet of silty <br /> clay, it is proposed that 2 sets of well points be installed. The first set will penetrate only <br /> the upper 10 feet of sand while the second will be sealed through the sand and will be <br /> perforated only within the lower clay zone (Figure 1-2). Each separate series of well <br /> points will be manifolded together with the extracted vapors sent to separate compressors <br /> and carbon beds. Flush threaded 4 inch perforated and blank PVC pipe will be used for <br /> the well points which will be manifolded together via 4 inch pipe into a 4 or 6 inch trunk <br /> line leading to each compressor. <br /> Operation of the Venting System <br /> Operation of the soil venting system will begin once all regulatory permits and approval <br /> • have been obtained. Operations will start with 9 well points into each soil layer at an air <br />