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' 12 September 2002 <br /> AGE-NC Project No 95-0137 <br /> ' Page 2 of 8 <br /> ' vapor meter(OVM)equipped with a photo-ionization detector PID(Thermo Environmental 580A, <br /> 10 0eV, calibrated to isobutylene 100 ppb) Field measurements, recorded at regular Intervals <br /> between 05 December 2000 and 11 June 2002, are summarized in Table 3 <br /> ' Soil-vapor samples were collected to document trends in concentrations of hydrocarbon vapor in the <br /> soil-vapor extracted by the SVE network and to determine the treatment system hydrocarbon <br /> ' destruction rate Soil-vapor samples from the influent and effluent stream and one inlet sample were <br /> collected in Tedlar vapor bags on 10 January,21 February, 11 March, 16 April, 13 May and 11 June <br /> 2002 using a vacuum pump attached to the Influent and effluent stream The samples were labeled, <br /> ' placed in a pre-chilled cooler and transported under chain-of-custody to transported to McCampbell <br /> Analytical Inc (MAI) a California Department of Health Services (DHS)-certified laboratory in <br /> Pacheco, California, The samples were analyzed for <br /> ' • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified, <br /> ' • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary butyl ether <br /> (MTBE) in accordance with EPA Method 8020, <br /> ' The results of the laboratory analysis are summarized in Table 1 <br /> ' 2 12 In-Situ Air Sparging Monitoring and Maintenance <br /> The EnvioSparge IAS system was monitored and serviced over the last two quarters Regular <br /> ' measurements of the dissolved oxygen in the ground water wells since the initiation of the <br /> remediation system have shown a low to moderate dissolved oxygen increase in ground water wells <br /> Consequently the sparging flow rate was adjusted to approximately 4-5 scfm and to a pressure of <br /> ' 5 psi <br /> ' 2 2 QUARTERLY WELL MONITORING PROCEDURES <br /> ' Quarterly ground water monitoring activities were conducted on 19 February and 19 June 2002, <br /> ground water monitoring was performed on monitoring wells MW-1 through MW-5 <br /> 1 <br /> ' Advanced CcoEnvironmental,Inc <br />