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' 28 May 1991 GeoAudit CV 43C4 . 1 . 1 - Work Plan for Vacuum Extraction Page 6 of 10 The system consists of a vacuum blower and an internal combustion ' engine. The vacuum blower is connected to a vapor recovery well, which is established in the center of the contaminated zone (Figure 2 - Site Plan) . Under the suction force of the blower, air displacement towards the vapor recovery well(s) takes place. The hydrocarbon laden air passes through a protection filter and is drawn into the carburetion system of the engine. In the carburetion system the air-to-fuel ratio (AFR) of the mixture is adjusted properly through the use of an oxygen sensor and fuel control module (FCM) . If necessary, natural gas is added to the intake stream to maintain an optimal AFR level for complete combustion. ' The combustion gases are exhausted to the atmosphere through a three way catalytic converter. The catalytic converter reduces the hydrocarbon, carbon monoxide and oxides of nitrogen emissions by ' better than 75%, 75% and 600, respectively. A schematic representation of the vapor recovery well to be implemented as a part of the system is depicted in Figure 3 of our work plan submitted to the SJEHD. Specification of ET Vaclean 1000 and parts of the system are depicted in Appendix 1 . ' 4 . ACOUSTIC ASPECT According to an acoustic survey on the Vaclean 1000, a maximum ' noise level of 79 dB is generated at the likely operational rpm of 2 , 000 within a 25 feet radius (Figure 4 - Acoustic Survey) . In order to minimize the noise problem, the vacuum extraction unit is installed inside an existing storage structure southwest of the building of Genova Bakery (Figure 2) . This dedicated station covers an area of 20 by 20 feet. With a ceiling height 10 feet, ample ' circulation is expected to take place to prevent any system overheating. By installing the unit inside the structure, a reduction of the ' engine noise of approximately 20 dB is anticipated. The plan calls for additional noise reduction of greater than 30 dB by affixing acoustic insulation materials at the inside of the station. The ' nearest residence is located approximately 35 feet. The reduction of the stack noise, which normally poses a less significant problem, is achieved by increasing its height. A stack pipe of approximately 20 feet is planned to be installed. We believe that sufficient provisions are provided to render these ' mitigative efforts as unobtrusive as possible.