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05 November 2010 AGE-NC Project No. 96-0254 Page 6 of 6 An ozone generator is utilized to produce gaseous ozone which is injected into the subsurface via microsparge points. The "microbubbles" (approximately 50 micrometers) are forced out into the surrounding saturated soil and react with the target analytes, producing carbon dioxide and water. The frequency and duration of ozone injection periods can be regulated at the ozone generator control box. Initially, operation of the ozone injection system will be based on the manufacturer's recommendations. Injection rates,frequencyand duration may be adjusted to compensate for site conditions during the pilot test. The ozone injection pilot test will be performed for approximately 26 weeks. On completion of three months of 101, an evaluation of the effect and recommendations for modification or reduction of the 101 will be proposed based on the data collected. Ground water samples are proposed to be collected and analyzed on a monthly basis, from monitoring wells MW-1 B and MW-4. Samples will be analyzed at a CDPH-certified laboratory to evaluate the effectiveness of the ozone injection system. The ground water samples will be analyzed for the following constituents: • TPH-g in accordance with EPA Method 8015 Modified; • BTEX, the fuel additives methyl tertiary-butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether(ETBE), tertiary-amyl methyl ether(TAME), tertiary butanol (TBA), ethylene dibromide (EDB), and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B. • Metals by appropriate EPA methods 200.7 and 6010B. Laboratory reports for ground water analysis, testing methods, laboratory quality assurance/quality control (QA/QC) reports, and sample chain of custody documentation will be presented in a report with findings and recommendations. Additionally, depth to ground water, dissolved oxygen, oxygen reduction potential (ORP), ph, and total dissolved solids (TDS) by electrical conductivity(EC)will be measured in-situ on a monthly basis from all wells. Advanced GeoEnvironmental,Inc.