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07 ,Tune 2002 <br /> AGE-NC Project No- 95-0185 <br /> Page 6 of 6 <br /> 4.6. IN-SITU OZONE SPARGING PILOT TEST <br /> The Criegee Oxidation (C-Sparge) system is an in-situ air stripping process utilizing fine bubbles of <br /> ozone-rich air,injectedinto saturatedsoilto extract anddecompose dissolvedpetroleumhydrocarbon <br /> constituents. <br /> An ozone generator is utilized to produce gaseous ozone which is injected into the subsurface via <br /> microsparge points. The "microbubbles" (approximately 50 micrometers) are forced out into the <br /> surrounding saturated soil and react with the target analytes, producing carbon dioxide and water. <br /> The frequency and duration of ozone injection periods can be regulated at the ozone generator <br /> control box. Initially, operation of the ozone injection system will be.based on the manufacturer's <br /> recommendations. Injection rates, frequency and duration may be adjusted to compensate for site <br /> conditions during the pilot test. The ozone sparge feasibility test will be performed for approximately <br /> 24 week; ground water samples will be collected monthly from the existing monitoring well network <br /> and the proposed monitoring well and analyzed at a DHS-certified laboratory to evaluate the <br /> effectiveness of the ozone sparge system. The grab water samples will be analyzed for the following <br /> • constituents'. <br /> TPH-g in accordance with EPA Method 8015 Modified; <br /> • BTEX compounds and MTBE in accordance with EPA Method 8020 and <br /> • MTBE, TAME, DIPS, ETBE and TBA by EPA Method 8260 Modified. <br /> Laboratory reports for ground water analysis, testing methods, laboratory quality assurance/quality <br /> control (QA/QC) reports, and sample chain of custody documentation will be presented in a report <br /> with findings and recommendations. <br /> Advanced GeoEnvironmental,Inc. <br />