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02 September 2010 AGE-NC Project No. 95-0184 Page 4 of 7 2.4. IN-WELL AIR-SPARGING APPLICATION Ground water in the former UST area may be more effectively addressed by in-well aeration and SVE, while ground water outside the direct plume area may be more effectively addressed byattempting to stimulate bioremdiation through sparging to increase dissolved oxygen concentrations. The initial dissolved oxygen concentrations measured for the IAS pilot test baseline demonstrates the dissolved hydrocarbon plume is in an anaerobic state, likely caused by the sulfate (sulfur in petroleum) or nitrate reduction occurring within the plume. 2.5. INTERIM REMEDIATION START-UP PERIOD During the first week of operation, IAS/SVE operational parameters including soil-vapor sample concentrations, air-flow, vacuum and temperature will be monitored on a daily basis. Influent and effluent air-flow vapor samples will be collected on a daily basis and submitted to a State of California Department of Public Health (CDPH)-certified laboratory for analysis of the following constituents: • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 8015 Modified; and • Benzene,toluene, ethylbenzene, and total xylenes(BTEX)and methyl tertiary-butyl ether (MTBE) in accordance with EPA Method 82608. Operational parameters collected will be used to determine the optimal destruction rate of recovered hydrocarbon vapors and analytical results will be used to monitor hydrocarbon destruction efficiency. 2.6. MONITORING AND MAINTENANCE Following the SVE start-up period, SVE operational parameters will be monitored and preventive maintenance will be performed according to manufacturers' recommendations on a weekly basis. During the first three months of operation influent soil vapor samples will be collected on a weekly basis, subsequent soil vapor samples will be collected on a monthly basis to monitor cleanup progress. Effluent samples will be collected monthly. Collected samples will be submitted to a CDPH-certified laboratory for analysis of the above constituents. Laboratory reports for vapor sample analysis, testing methods, laboratory quality assurance/quality control (QA/QC) reports, and sample chain of custody documentation will be presented in quarterly reports. Advanced GeoEnvironmental,Inc.