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Ift. I.W, 04 January 2005 AGE-NC Project No. 96-0235 Page 5 of 5 3.3. IN-SITU OZONE SPARGING PILOT STUDY The typical ozone system is an in-situ air stripping process utilizing fine bubbles of ozone-rich air, injected into saturated soil to extract and decompose dissolved petroleum hydrocarbon constituents. 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, frequency and duration may be adjusted to compensate for site conditions during the pilot test.The ozone sparge feasibility test will be performed for approximately 24 week;ground water samples will be collected monthly from the existing monitoring wells MW-9 and MW-10. Samples will be analyzed at a DHS-certified laboratory to evaluate the effectiveness of the ozone sparge system. The grab water samples will be analyzed for the following constituents: • TPH-g in accordance with EPA Method 8015 Modified; • BTEX compounds in accordance with EPA Method 8020 and • 1,2-DCA by EPA Method 8260 Modified. • Metals by appropriate EPA methods 700 and 6010. 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, dissolved oxygen and oxygen reduction potential (ORP) will be measured in-situ on a monthly basis. Advanced GeoEnvironmental,Inc.