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M Infurna Project No 1232 January 11, 2000 Page 2 1 2.0 START-UP ' Start-up operations began on October 6, 1999 All cut-off valves connecting the wells to vapor extraction and air sparging manifolds were opened, and the thermal oxidizer and the air compressor were put in operation After two hours of operation,the system was shut-down automatically by a high-level switch in the knock-out drum due to a significant amount of ground water being pulled into the system under the negative pressure After closing air sparging cut-ott valves at in-well sparging wells VEW-3, VEW-4 and VEW-5, the remediation ' system was restarted and contiguously operated for several hours without interruption Vapor reading were taken from individual wells using a field PID instrument Two readings were taken from each well one in a vapor extraction only mode, and the second in an air-sparging 1 mode to evaluate the effect of air sparging The results are presented in Table 1 During start-up operations, it became apparent that the noise being generated by the vacuum ' blower was excessive, i e , in excess of the standards contained in the City of Stockton Noise Ordinance, and therefore, the system was shut-down overnight On October 7, 1999, the remediation system was restarted and air samples were taken from the inlet of the oxidizer(vacuum blower discharge) and from the stack to evaluate compliance with conditions contained in the Permit to Construct issued by the SJVAPCD The samples were collected in the presence of a SJVAPCD inspector and analyzed for total petroleum hydrocarbons (TPH), benzene, toluene, ethylbenzene, toluene (BTEX) and methyl tertiary butyl ether(MTBE) The results of testing are shown in Table 2 Note, a formal report presenting ' the results of the source testing was prepared by EAI entitled "Thermal Oxidizer Analytical Testing Results" dated October 13, 1999, which was submitted to the SJVAPCD and County Health Based on the testing results, the SJVAPCD issued a Permit to Operate for the ' remediation system Due to excessive noise, the system was shut-down after completing the source testing ' 3.0 NOISE ABATEMENT After working with the City of Stockton and obtaining pre-approval from the UST Cleanup Fund, noise abatement was accomplished by reducing the speed of the blowers electric motor and installation of an acoustical enclosure The remediation system was then restarted on ' November 4, 1999 4.0 COUNTY HEALTH REQUESTED MODIFICATIONS ' After inspecting the site, County Health requested that a 500-gallon plastic tank for collection of ground water carried by the extracted soil vapor be installed to replace the 55-gallon drum 1 being used for this purpose, and that the surface area of the interior portion of all well boxes be - - — • grouted These modifications were completed in November 1999 ' ENVIRONMENTAL AUDIT,INC®