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M Infurna Project No 1232 <br /> July 6, 2000 <br /> Page 2 <br /> 1 <br /> direct reading of the VOC concentrations in extracted soil vapor and combustion gases, as <br /> required by the SJ VAPCD permit, are presented in Table 2 <br /> 2 0 REMEDIATION RESULTS <br /> ' Since start-up, the unit has operated for a total of 2,835 hours, removing approximately 7,561 <br /> pounds of petroleum hydrocarbons from impacted soil and ground water During this reporting <br /> period the unit operated for 1,036 hours and removed approximately 210 pounds of petroleum <br /> ' hydrocarbons The calculated amount of TPH, benzene, toluene, ethylbenzene, and xylenes <br /> and the corresponding destruction and removal efficiency of the thermal oxidizer are presented <br /> in Tables 3, 4, 5, 6 and 7, respectively <br /> ' Analytical results of ground water samples obtained from ground water monitoring wells on <br /> June 6, 2000, indicate significant reduction in the concentrations of dissolved hydrocarbons <br /> ' (see Table 8) A complete ground water monitoring report will be submitted separately <br /> 3.0 CONCLUSIONS <br /> ' The remediation unit has been operating in full compliance with the Permit to Operate issued <br /> by the SJVAPCD During this reporting period, the unit operated for 1,036 hours and removed <br /> approximately 210 pounds of total petroleum hydrocarbons from impacted soil and ground <br /> water The concentration of carbon dioxide in extracted soil vapor (0 7%) in excess of the <br /> concentration in the ambient air (0 02%), demonstrates that hydrocarbons in soil and ground <br /> ' water are subjected to biodegradation by natural microorganisms <br /> The concentration of hydrocarbons in extracted soil vapor indicates significant reduction, since <br />' initial startup of the system, which makes it neither necessary nor economical to operate the <br /> system on a continuous basis Therefore, the system will be operated in an on/off(pulse mode) <br /> for the next quarterly period <br />' The concentration of dissolved hydrocarbons in ground water also has declined considerably in <br /> all monitoring wells <br /> ENVIRONMENTAL AUDIT,INC© <br />