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1, M Hartzell EAI Project No 1232 October 10, 2000 Page 2 ther required b the VOC concentrations ons in extracted soil vapor and combustion gases, as requ e y SJVAPCD permit, are presented in Table 3 2.0 REMEDIATION RESULTS Since start-up, the unit has operated for a total of 3,914 hours, removing approximately 8,146 pounds of petroleum hydrocarbons from impacted soil and ground water During this reporting '} period the unit operated for 1,079 hours and removed approximately 474 pounds of petroleum hydrocarbons The calculated amount of TPH, benzene, toluene, ethylbenzene, and xylenes and the corresponding destruction and removal efficiency of the thermal oxidizer are presented ' in Tables 4, 5, 6, 7 and 8, respectively Figure 2 presents the cumulative amount of total petroleum hydrocarbons and benzene removed by vapor extraction, and Figure 3 present the historical concentration of total petroleum hydrocarbons and benzene in extracted soil vapor ' Analytical results of ground water samples obtained from ground water monitoring wells on September 19, 2000, indicate that the major portion of light hydrocarbons including benzene, ' toluene, and ethylbenzene has been removed from ground water (see Table 9 and Figure 1) The rate of reduction of heavier hydrocarbons is expected to be lower due to lower volatility and lower rate of biodegradation A complete ground water monitoring report will be submitted separately 3.0 CONCLUSIONS The remediation unit has been operating in full compliance with the Permit to Operate issued by the SJVAPCD During this reporting period, the unit operated for 1,079 hours and removed approximately 474 pounds of total petroleum hydrocarbons from impacted soil and ground water The concentration of carbon dioxide in extracted soil vapor (0 6%) in excess of the concentration in the ambient air (0 02%), demonstrates that hydrocarbons in soil and ground ' water are subjected to biodegradation by natural microorganisms The concentration of hydrocarbons in extracted soil vapor indicates significant reduction, since ' initial startup of the system, which makes it neither necessary nor economical to operate the system on a continuous basis Therefore, the system will continue to operate in an on/off(pulse mode) for the next quarterly period Due to a low concentration of VOCs in the extracted soil air, EA1 will request approval to install a catalytic cell to operate the oxidizer in the catalytic mode, and install a timer on the air corepressor to operate in the pulse mode to reduce the operating costs I ENVIRONMENTAL AUDIT, INC