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M Infurna Project No 1232 January 11, 2000 Page 3 ' 5.0 SYSTEM OPERATION AND MONITORING ' The remediation system operated continuously between November 4 and 20, 1999, when it was shut-down due to high volume of ground water carried over by the extracted soil vapor The 500-gallon tank was installed and the system restarted on November 30, 1999 The system was ' operated continuously between November 30, and December 10, 1999, when the system was intentionally shut-down to allow ground water to establish equilibrium, prior to completing ground water sampling on December 13, 1999 A separate report documenting the results of ' ground water monitoring will be submitted The system was then restarted on December 21, 1999 During the reporting period the system was operating for 415 hours The system was monitored on a daily basis for the first week of operation and on a weekly basis thereafter The field report forms indicating parameters recorded are presented in Attachment A Field readings from remediation wells were taken on October 7, 1999 and November 16, 1999 (see Table 1) ' Soil vapor samples from the vacuum blower discharge and the stack were obtained on October 7, 1999 and December 21, 1999 The samples were analyzed for TPH, BTEX, and MTBE A sample taken from the blow discharge on December 21 was also analyzed for carbon dioxide to evaluate the effect of biodegradation of contaminants in the subsurface The results of the testing are presented in Table 2 and Attachment B contains copies of the chain of custody records and laboratory reports Approximately 100 gallons of ground water per week is currently pumped from the knockout pot of the oxidizer to the 500-gallon collection tank On December 17, 1999, the collected ' ground water (a non-hazardous waste) was removed from the site by American Valley Waste Oil, Inc ' 6 0 REMEDIATION RESULTS Since start-up the unit has been in operation for 415 hours as of December 21, 1999, when the ' latest analytical testing was performed, removing approximately 4,100 pounds of petroleum hydrocarbons from impacted soil and ground water The calculated amount of TPH, benzene, toluene, ethylbenzene, and xylenes and corresponding the destruction and removal efficiency of ' the thermal oxidizer are presented in Tables 3, 4, 5, 6 and 7, respectively The analytical data from the second round of testing indicates the presence of low concentrations of MTBE in the extracted soil vapor, which was not detected in the first round EPA Method TO-3, which was the analyses used on the vapor samples, is a GC method which does not quantified MTBE Therefore, a GC/MS analytical method will be used for the next round of samples to better quantify the concentration, if any, of MTBE 1 rENVIRONMENTAL AUDIT,INC®