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28 February 2005 <br /> AGE-NC Project No 99-0624 <br /> Page 9 of 12 <br /> holding tank will be trucked offsite to a state-certified site for disposal of the Impacted ground water <br /> Batch removal procedures are provided in Section 5 5 <br /> 49 REPORT PREPARATION <br /> Upon completion of well installation and the 24-week IOS pilot study, a report will be prepared <br /> presenting the findings of the Investigation The report will include a description of the work <br /> performed, the results of any soil and grab ground water analysis, and the results of the IOS pilot <br /> study Conclusions, applicable recommendations, maps and cross-sections will be included in the <br /> report The report will be in a format acceptable to the EHD and the CVRWQCB, and will be <br /> reviewed and signed by a California Registered Geologist <br /> 5.0. FIELD PROCEDURES <br /> All field procedures will be overseen by an AGE representative under the supervision of California <br /> Registered Geologist Procedures for ozone well installation and ozone spargmg are described below <br /> • <br /> 5 1 IN-SITU OZONE SPARGING WELL INSTALLATION <br /> The proposed ozone sparge diffuser well will be installed utilizing a truck-mounted drill rig equipped <br /> with 8 25-inch diameter hollow stern augers The hollow stem augers will be cleaned prior to <br /> advancement of each borehole The ozone sparge well will be advanced to a depth of approximately <br /> 75 feet bsg <br /> The ozone sparge well will be completed with a manufacturer-assembled 2-inch by 30-inch <br /> macroporous sparge diffuser point and casing The sparge diffuser point assembly will be placed into <br /> the borehole through the interior of the hollow-stem augers and installed at a depth of approximately <br /> 60 feet bsg in the water bearing zone After installation,filter pack material consisting of pre-washed <br /> #2/16 sand will be added from the bottom of the borehole to approximately two feet above the sparge <br /> point <br /> A nominal two-foot thick bentonite seal will be placed above the filter pack of the well to minimize <br /> the potential of grout penetration into the filter pack or screened section of the well The bentonite <br /> seal will be formed by pouring bentonite chips into the annulus and allowing them to settle on the <br /> filter pack Bentonite chips will be hydrated using five gallons of water, unless water is present in <br /> the interior of the hollow-stem augers The bentonite chips will be allowed to hydrate for a minimum <br /> . of one-half hour prior to grouting <br /> A&anced GeoEnvironmental,Inc <br />