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25 March 2009 AGE-NC Project No. 95-0121 Page 8 of 9 Following the start-up period, the DPE system vapor will be monitored weekly using an organic vapor analyzer (OVA) equipped with aphoto-ionization detector (PID) to ensure optimal destruction of recovered hydrocarbon vapors and to monitor cleanup progress. The PID readings will be taken and recorded from the influent and effluent ends of the catalytic oxidizer. Operational parameters (airflow - Dwyer DS-200 flow sensor, air vacuum and volume ofprocessed vapor) will be measured on a weekly basis to monitor and record soil-vapor volumes extracted and operational efficiency. Induced vacuum measurements will be collected utilizing aMagnehelic vacuum gauge attached near the inlet of the blower; DPE air flow will be monitored using a Dwyer DS-200 flow sensor. Following the start-up period, the DPE air flow along the influent and effluent-lines will be monitored weekly for the presence of organic vapor with the PID. Vapor samples will be collected on a monthly basis from the influent and effluent end of the vapor extraction system utilizing the vacuum pump on a Model 580 organic vapor meter (Thermo Environmental Instruments Inc.). The samples will be collected in Tedlarg bags and transported to a CaliforniaDepartment ofPublic Heath (CDPH)-certified laboratoryin a sealed drycontainerunder chain-of-custody. Following the initial start-up period, influent and effluent air-flow vapor will be collected from sampling ports located after the liquid-ring blower and as vapor exits the stack. Influent and effluent water samples will be collected before the first carbon vessel (GAC- 1) and after the third (GAC-3) on a monthly basis and submitted to a CDPH-certified laboratory for analysis of the following constituents: • TPH-g in accordance with EPA Method 8015 Modified or TPH in accordance with EPA Method 1664; • Benzene, Toluene, Ethylbenzene, and Xylenes (BTEX) in accordance with EPA Method 8260/624; • Fuel oxygenates methyl tert butyl ether (MTBE), tert butyl alcohol (TBA), di-isopropyl ether (DIPE), ter amyl methyl ether (TAME), ethyl ter butyl ether (ETBE) in accordance with EPA Method 8260/624; and • 1 ,2-dichloroethane ( 1 ,2 DCA), and ethylene dibromide (EDB) in accordance with EPA Method 8260/624. Laboratory reports for water and/or vapor analysis, testing methods, laboratory quality assurance/quality control (QA/QC) reports, and sample chain of custody documentation will be presented in quarterly reports Advanced GeaEnviranmental, Inc.