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1 <br /> Quarterly Monitoring Report - Third Quarter 2003 <br /> City of Stockton - FIRE STATION #2 <br />' 110 West Sonora Street, Stockton, California <br />' 1.0. INTRODUCTION AND SCOPE OF WORK <br />' At the request of the City of Stockton,Advanced GeoEnviromnental,Inc (AGE) has prepared this <br /> report for corrective action activities conducted at 110 West Sonora Street,Stockton,California(the <br /> site) The location of the site and its surroundings are illustrated in Figure 1 Structures and well <br />' locations associated with the site are depicted in Figure 2 <br /> An ozone air-sparging system was mobilized on 01 July 2003 and operated since that date This <br />' report documents monitoring of the ozone system and a ground water monitoring event on <br /> 08 July 2003 and presents the results of laboratory analysis of ground water samples <br /> 2 0. PROCEDURES <br /> Field procedures for ground water sampling are described below All field work was performed in <br /> accordance with Central Valley Regional Water Quality Control Board(CVRWQCB)guidelines for <br /> the investigation of underground storage tank (UST) sites <br /> 21 OZONE SPARGE SYSTEM INSTALLATION <br /> An ozone-sparging(OS)system was installed at the site in late June and p <br /> began operation on 01 July <br /> g <br /> 2003 An oxygen condenser and ozone generator is fitted into a compressed air-stream through a <br /> throttled venture This flow stream is then connected to a manifold, under a timer cycled into the <br /> sparge wells using a 3/8-inch diameter PVC tubing to the two-inch diameter network via under <br /> ground piping The Ozone-IAS system delivers 10 standard cubic feet per minute(scfm)at a pressure <br /> of 20 pounds per square inch, adequate to displace the static water within each sparge well <br /> The ozone system was monitored and serviced over the first month of operation The dissolved <br /> oxygen in the ground water wells was not measured regularly during the week However, dissolved <br /> oxygen has shown a low to moderate increase in ground water wells since the initiation of the <br /> remediation system (Appendix A) <br /> 2 2 QUARTERLY WELL MONITORING <br /> On 08 July 2003, depth to ground water and dissolved oxygen were measured in monitoring wells <br />' MW-1 through MW-5 and vapor wells VW-1, VW-2d, VW-3 and VW-5d, and wells MW-1 to <br /> MW-5, VW-1, VW-2d, VW-3 and VW-5d were purged and sampled <br /> Advanced GcoEnvironmental,fnc <br />