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*../ Ir L. 20 November 2003 AGE-NC Project No. 96-0263 Page 10 of 11 L. 9.2. IOS DISTRIBUTION NETWORK L. A network of!/2-inch diameter,PVC tubing will be installed in appropriately sized conduit in a series of trenches approximately 8-inches wide and 12-inches deep.Ozone distribution lines will be routed LN underground from each IOS well head to the a solenoid control valve on the ozone generator.A plan of the proposed piping system and ozone generator location is depicted in Figure 12. t6w The proposed location of the ozone generator is near the Tracy Marine repair facility located west of the former UST location (Figure 12). The proposed location for the ozone generator will allow the repair facility to conduct their day to day business without interference from the operation of the remediation system. The vacuum blower unit will be secured by a chain-linked, gated enclosure approximately 4 feet wide, 8 feet long and 7 feet high. &W Electricity is readily available to the site. A dedicated electrical meter will be installed by representatives of PG & E that will connect directly to the ozone generating unit. 9.3. IOS GENERATOR SYSTEM 'i The frequency and duration of ozone injection periods can be regulated at the ozone generator control box. Initially, operation of the ozone injection system will be based on the manufacturer's recommendations. Injection rates, frequency and duration may be adjusted to compensate for site `i conditions during the pilot test. The ozone sparge start-up monitoring will be performed for approximately six months; ground water samples will be collected and analyzed and dissolved oxygen levels monitored monthly from the existing monitoring well network to evaluate the effectiveness of the ozone sparge system. Ground water samples will be collected and analyzed in accordance with current ground water sampling and analysis procedures. 9.4. EQUIPMENT DECONTAMINATION V All sampling tools used for sample collection will be thoroughly washed with a solution of Alconox and rinsed with clean water prior to use at each sampling location. Hollow-stem augers will be �. steam-cleaned prior to advancing each pilot boring. �. 10.0. LIMITATIONS Our professional services were performed using that degree of care and skill ordinarily exercised by "-' environmental consultants practicing in this or similar localities. The findings were based upon review of reports prepared by a previous consultant and analytical results provided by an independent W Advanced CeoEnvironmcnta1,Inc. t.