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15 December 2003 <br /> AGE-NC Project No. 95-0109 <br /> Page 6 of 6 <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 <br /> approximately 24 week; ground water samples will be collected monthly from the existing <br /> monitoring wells MW-1, MW-14, MW-4 and EW-1. Samples will be analyzed at a DHS-certified <br /> laboratory to evaluate the effectiveness of the ozone sparge system.The grab water samples will be <br /> analyzed for the following constituents: <br /> • TPH-g in accordance with EPA Method 8015 Modified; <br /> • BTEX compounds in accordance with EPA Method 8020 and <br /> • 1,2-DCA by EPA Method 8260 Modified. <br /> • Iron by EPA method 6010B. <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 /> Additionally, dissolved oxygen and oxygen reduction potential (ORP)will be measured in-situ on <br /> a monthly basis. <br /> Advanced GeoEnvironmental,Inc. <br />