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28 February 2005 <br /> AGE-NC Project No 99-0624 <br /> Page 11 of 12 <br /> • Conductivity by EPA method 120 1, <br /> • Alkalinity by EPA Method 310 1, <br /> • Total Dissolved Solids by EPA Method 160 1, and <br /> • Oxidation-Reduction Potential by SM 2580B <br /> The laboratory bench-testing procedure involves utilizing an ozone generator to produce gaseous <br /> ozone into a laboratory-cleaned and sealable beaker containing an equal weight of soil and water(a <br /> minimum 1000 grams soil, a minimum volume of soil and water of 1 3 liters) Ozone will be <br /> continually delivered into the mixture via a teflon or chemical-resistant tubing, at a rate of <br /> 100 milliliters per minute (mi/min) for 5 days Each day an aliquot of 20 ml of water will be <br /> collected and analyzed for chrome VI, ozone and pH <br /> At the termination of bench testing, the remaining water will be fully analyzed for the constituents <br /> listed above to determine any changes in chemical or physical parameters The test water will be held <br /> for one weep in the event that additional testing is required for any metals or minerals of concern that <br /> may have been detected <br /> 5 4 , IN-SITU OZONE SPARGING PILOT TEST <br /> The typical ozone system is an in-situ air stripping process utilizing fine bubbles of ozone-rich air, <br /> injected into saturated soil to extract and decompose dissolved petroleum hydrocarbon 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 <br /> The ozone sparge feasibility test will be performed for approximately 6 months Each month, <br /> dissolved oxygen and oxygen reduction potential(ORP)will be measured in-situ,and ground water <br /> samples will be collected from monitoring wells MW-2, MW-3, MW-6 and MW-7 for analysis at <br /> a DHS-certified laboratory,in order to evaluate the radius of influence and effectiveness of the ozone <br /> sparging system The grab ground water samples will be analyzed for the constituents listed in <br /> Section 4 2 and <br /> Advanced GeoEnvironmentai,Inc <br />