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Final Remedial Plan - Geweke <br />' 2 January 1992 <br /> Page 8 of . 15 <br /> The ET Vaclean 1000 equipped is a ui ed with a low oil pressure and/or high <br /> coolant temperature safety system, which in case of malfunction <br /> turns the ignition and the fuel off. In addition, the engine <br />' becomes inoperative when the air-to-fuel ratio can not be <br /> maintained within certain limits. <br /> _. <br /> The_ _system is installed iri an- enclosed and lockable 'struc . ure_ o <br /> protect the system from tampering by unauthorized persoinel.iA non- <br /> smoking area of 20 feet radius is established. <br /> 3 . 5 . HYDROCARBON DESTRUCTION AND HEALTH RISK FACTOR <br />' Based upon the existing site assessment data, approximately 3 , 000 <br /> gallons of gasoline had been released to the soil, indicating a <br /> total mass of approximately 18, 500 pounds. Please note again that <br />' the figures presented here are liberally calculated. A destruction <br /> rate of greater than 90% is anticipated. The plan calls for an <br /> average daily air emission of 5 lbs of TPH. it is therefore <br /> anticipated that the vacuum extraction is operational for a period <br /> between 12 to 24 months. <br /> The data presented here are based upon the operation of the Vaclean <br />' 1000 using propane as supplementary fuel. The use of natural gas <br /> for this purpose has several additional advantages. Natural gas, is <br /> less expensive than propane and is readily available at the site. <br />' Supplemental fuel promotes not only a more complete combustion of <br /> the hydrocarbon contaminants, natural gas is also proven to burn <br /> very cleanly, leaving practically -no by-products. <br /> 3 . 6 . MONITORING PROGRAM <br />' To monitor the degradation of hydrocarbons, vapor from the <br /> extraction wells is metered for the presence of volatile organics . <br /> A weekly-monthly monitoring is scheduled for this purpose. <br />' A decrease of the organic vapor content is anticipated to occur <br /> within the first weeks. Upon reaching a constant level of typically <br />' between 500 to 1, 000 ppm as hexane, a confirmatory sampling is <br /> scheduled (Section 3 .7 .7 . ) . A treatment period between 12 to 24 <br /> months is estimated. <br /> 1 <br /> 1 <br />