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05 March 2004 <br /> AGE-NC.-Project'-No. 96-0254 - <br /> Page 5 of 5 <br /> feet per'minute (scfm) at a,pressure of 20 pounds per sware-'inch; adequate-to displace the static <br /> water within each sparge well. <br /> The vacuum blower unit will be secured by a chain-li ked',.gated enclosure approxiinately.4 feet. <br /> wide, S feet long and 7 feet high._ <br /> Electricity is readily available to-the site. A dedicated.electrical meter panel will be installed by <br /> Licenced Electrical Contractor with alelecthcal'meter.service connection installed representatives.' <br /> of Pacific Gas.and Electric (PG &-E).that will connect dire6tly.to.the ozone generating unit.. <br /> A pian of the proposed piping system-and ozone genera or location is depicted in Figure 4. = <br /> 4.3. IN-SITU OZONE SPARGING TILOT TEST <br /> The typical ozone system is an in-situ air stripping'proc ss utilizing f rie bubbles of ozone.6ch 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'.' (approximate y 50 micrometers) are.forced out into the <br /> surrounding saturated soil and react with the target anal rtes, producing carbon dioxide and water. <br /> The..frequency..and duration of ozone injection period can be regulated at the ozone generator <br /> control box. Initially, operation of the ozone injections stem will'be based on the manufacturer's <br /> recommendations. Injection .rates; frequent' -4nd duration may be adjusted to-compensate for site <br /> conditions during-the pilot test: The ozone sparge .st =up monitoring will be. performed for <br /> approximately. six months; ground water samples.will be cotlected� and analyzed .and.dissolved <br /> oxygen levels monitored.:monthly:from the existing onitoring`well network.to evaluate the . <br /> effectiveness of the ozone sparge system. Ground watel samples will'be collected and;analyzed in- <br /> accordance with current ground water sampling and an lysis procedures. .. <br /> 4.4. EQUIPMENT DECONTAMINATION <br /> All sam'pling;tools used for sample collection will be thoroughly washed with a solution of Alconox,; <br /> and rinsed with"clean water prior to use.at each samp ing -location: Hollow-stem augers will,be <br /> _steam-cleaned prior to advancing.each pilot boring. <br /> Advanced GeoEnvironmental,int. <br />