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. Quarterly Monitoring Report - First Quarter 2004 <br /> City of Stockton - FIRE STATION#2 <br /> 110 West Sonora Street, Stockton, California <br /> 10. INTRODUCTION AND SCOPE OF WORK <br /> At the request of the City of Stockton,Advanced GeoEnvironmental, 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 operational at the site since 01 July 2003 This report documents <br /> monitoring of the ozone system and a ground water monitoring event on 26 March 2004 and presents <br /> 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 began operation on <br /> 01 July 2003 An oxygen condenser and ozone generator is fitted into a compressed air-stream <br /> through a throttled venture This flow stream is then connected to a manifold, under a timer cycled <br /> into the sparge wells using a 3/8-inch diameter PVC tubing to the two-inch diameter network via <br /> under ground piping The Ozone-IAS system delivers 10 to 15 standard cubic feet per minute(scfm) <br /> at a minimum pressure of 20 pounds per square inch, adequate to displace the static water within <br /> each sparge well The ozone system operation was monitored and serviced over the quarter of <br /> operation <br /> 2 2 QUARTERLY WELL MONITORING <br /> On 24 March 2004,depth to ground water was measured in monitoring wells MW-1 through MW-6 <br /> and vapor wells VW-1,VW-2d,VW-3 and VW-5d, then monitoring wells MW-6 and VW-2d were <br /> purged and sampled <br /> • <br /> Advanced GeoEnvironmental,Inc <br />