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4.2.7 Permitting <br /> All necessary construction and air emissions permits will be obtained prior to <br /> construction of the proposed system <br />' 4.3 System Evaluation Plan <br /> The system will be operated for a period of at least six months before its <br /> effectiveness is evaluated and system shut down is considered The system <br /> will be operated until San Joaquin County clean-up objectives(Appendix A) <br /> are obtained or until it is apparent that the contaminant removal has reached <br /> an asymptotic level and further system operation would yield no significant <br /> benefit Specifically, shut down of the soil vapor extraction system may also <br />' be proposed if air emissions data indicate that the TPH removal rate has <br /> fallen below 0 01 lb/hr for two consecutive monthly air sampling events <br /> In most cases degradation of petroleum hydrocarbons is limited by the <br /> solubility of oxygen in water (typically 6 to 12 µg/1) For example, toluene <br /> (C6H5-CH3) degradation can be represented by the reaction, <br /> C6H5-CH3+902-->7CO2+4H2O <br /> r� It follows that complete degradation of toluene requires about 3 lbs of oxygen <br /> for every pound of hydrocarbon Operation of the system for a period of one <br />' year at an average TPH removal rate of 0 01 lb/hr would remove <br /> approximately 88 lbs of contaminant in vapor form and could encourage <br /> biodegradation of up to 33,000 lbs of petroleum hydrocarbons <br />' Based on observed contaminant concentrations, it is estimated that the total <br /> mass of TPH contaminants at the site is about 75 lbs Calculations used in <br /> this estimate are supplied in Appendix E <br /> Remedial Action Work Plan <br /> Prepared for THE EARTSGRAINS COMPANY Prepared by Philip services Corp <br /> 1{1ENV1624001451RAP61300 doc 15 8131100 <br />