SITE INFORMATION AND CORRESPONDENCE

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REQUIRED SUPPLEMENTAL INFORMATION MA Y 19 1995 1. EQUIPMENT LOCATION DRAWING ENVIRONMENTAL Nl_=A PERMIT/SERVICES LTH Figure 1 shows the general location of the site. Figure 2 shows the site layout with its existing structures and property lines identified. Figure 2 also shows the location of the proposed emission unit. Figure 3 shows the location of the property with respect to streets and adjacent properties. Properties within 150 feet of the proposed emissions unit have been identified in the figure as well as the height of the surrounding buildings. 2. EQUIPMENT DESCRIPTION The proposed emissions unit is an ALTON V0150 VAPOR EXTRACTION SYSTEM. The vapor extraction system will be used to remediate the gasoline impacted soil at the site. Please see the completed SOIL AND GROUND WATER REMEDIATION QUESTIONNAIRE included with this application for more information on the nature of the contamination at the site. The unit has one, 5-HP, explosion-proof, electric motor that drives the vacuum blower. The unit uses an electrically heated precious metal catalytic bed to oxidize the hydrocarbon vapors that are extracted from the subsurface. Please see the manufacturer's literature included with this application as Attachment A for more information on the unit. After about 3 months of operation, Fugro expects that the amount of hydrocarbon vapors being extracted from the soil will decrease causing catalytic oxidation to be less economical than granular activated carbon adsorption, At this point, Fugro proposes replacing the oxidizer with a 2.0 HP GAST regenerative blower (model RS 1250-50), and two, 500-pound, AQUATEC, activated carbon adsorbers, in series, for emissions control. If the extracted vapor stream contains less than 2 pounds per day of hydrocarbon vapors, Fugro understands that a permit to operate is not required. At this point, the carbon adsorbers will be disconnected from the unit and the blower allowed to vent directly to the atmosphere. 3. DESCRIPTION OF OPERATION The vapor extraction system extracts soil vapor from vapor extraction, or, ground water monitoring wells. The soil vapors are mostly air mixed with some petroleum vapors. Before emission, the vapors are forced through a heater and catalyst. The hydrocarbon vapors in the flow stream are oxidized by heating and catalytic action in the emissions unit before being vented to the atmosphere.