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r installed on the piping from each well The metering rack will be secured with a Umstrut fastener rAfter the vapor piping is manifolded together it will be routed into a 55-gallon condensate knockout drum prior to its connection to the vapor treatment unit r 24 Treatment Compound rA 12 foot by 16 foot concrete slab will be installed to provide a floor for the treatment compound The slab will be at least 4 inches thick and slope slightly to the south The compound will be renclosed by a 6-foot high chain-link fence with two 6 foot wide locking gates The fence and gates will have privacy slats which match the existing fencing and paint scheme of the service ' station at the site Details of the treatment compound construction are shown in Figure 4 ' A weather resistant site procedures box will be mounted inside the remediation compound The box will contain the site specific health and safety plan, facility log book, and copies of all permits ' and approval letters related to the construction and operation of remediation facility 25 Extraction and Treatment Equipment ' An internal combustion (IC) engine will be used to extract and abate hydrocarbon-bearing vapors from the subsurface The expected destruction efficiency for the IC engine will be between r approximately 95% and 99% for TPHg and BTEX A vapor extraction flow diagram is shown on Figure 5 rThe IC engine will be used to extract and abate hydrocarbon-bearing vapor recovered from three rvapor extraction wells and the vapor extraction trench piping Soil vapor will pass through a 55- gallon condensate knockout drum prior to being sent through the IC engine The condensate drum will be located in the treatment compound and checked at least once weekly Disposal of the soil vapor condensate will be evaluated when the volume and concentration of the liquid is ' known 1434VES 1Cu SECOR Job No N0005.002.01 4 March 13 1995