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03 December 2004 . AGE-NC Project No 99-0637 IPage 2 of 2 Water-tight, traffic-rated well boxes were installed over the wells As-built well diagrams are presented in Figures 4 and 5 Ozone well locations are illustrated on Figure 2 I23 OZONE DISTRIBUTION SYSTEM INSTALLATION On 07 July 2004, the ozone distribution system was installed at the site A network of 3/8-mch diameter, PVC tubing was installed in 1/2-inch diameter PVC conduit in a series of trenches approximately 6-inches wide and 12-inches deep Ozone distribution lines were routed underground from each ozone well head to the solenoid control valve on the ozone generator A plan of the distribution system and ozone generator location is depicted on Figure 2 24 OZONE INJECTION SYSTEM START-UP On 19 August 2004, Ozone injection began at the site San Joaquin County Environmental Health Department staff personnel was on site to witness the system start-up However,on 26 August 2004, the ozone generator was observed to be off during a periodic monitoring and maintenance visit A malfunction with the ozone alarm system had caused the system to shut down just hours after start-up The problem was corrected with repairs and the system was re-started on 31 August 2004 Currently, the HC-2 50 ozone generation system is injecting 6% ozone-rich air into an individual ozone injection point for an approximate duration of 2 hours After completing the circuit of injection into the nine ozone wells, the ozone injection ceases for a mechanical hiatus for 2 hours, prior to re-initiation The injection pressure is approximately 8 0 psi Dissolved Oxygen (DO) percentage and Oxygen Reduction Potential (ORP)was measured from each monitoring well prior to system start-up and will be measured monthly during the six-month pilot study Field measurements are summarized in Table 1 3.0. 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, if any, were based upon analytical results provided by an independent laboratory Evaluation of the hydrogeologic conditions at the site for the purpose of this investigation was made from a limited number of available data points(ie ground water samples)and subsurface conditions may vary away from these data points No other warranty, expressed or implied, is made as to the professional interpretations, Iopinions and recommendations contained in this report Advanced GeoEnvwonmentai,Inc