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Quarterly Report - First Quarter 2005 <br /> FIRE STATION 42 <br /> I110 West Sonora Street, Stockton, California <br /> 1.0. INTRODUCTION <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 on Figure 1 Structures and well <br /> locations associated with the site are depicted on Figure 2 The site history and a description of <br /> previous work performed at the site are detailed in Appendix A <br /> II I INITIAL SITE REMEDIATION <br /> A soil vapor extraction/in-situ air sparging (SVE/IAS) system was installed during August and <br /> September 2001 Soil vapor monitoring and sampling events,groundwater sampling events and the <br /> results of laboratory analysis of the samples collected have been documented in subsequent quarterly <br /> monitoring reports The operation of the IAS system has produced only minor volatilization of the <br /> dissolved hydrocarbons in the deep ground water well samples at the site(VW-2d),but has reduced <br /> the dissolved hydrocarbon concentration in the shallow well samples (MW-1 and VW-1)as well as <br /> I the concentrations of hydrocarbons in the soil vapor extraction (SVE) influent to below detection <br /> levels Subsequently, AGE proposed to augment the IAS system with a low-flow ozone generator <br /> in the work plan dated 28 January 2003 <br /> 12 AUGMENTED SITE REMEDIATION <br /> I An ozone airs sparging Y Y system was installed 01 Jul 2003 on-site, utilizing the existing in-situ air <br /> p <br /> sparging (IAS) system wells IAS-1 through IAS-3 The system has operated continuously since <br /> installation, however,in February 2005, the system was vandalized,resulting in the replacement of <br /> the air compressor for the system In total,the ozone system has operated approximately 8,000 hours <br /> This report documents the installation of one additional air-sparge diffuser, and ground water <br /> monitoring and sampling of monitoring wells on 31 March 2005,in order to determine concentration <br /> trends for the petroleum hydrocarbons <br /> 2.0. PROCEDURES <br /> All field work was performed in accordance with Central Valley Regional Water Quality Control <br /> Board(CVRWQCB)guidelines for the investigation of underground storage tank(UST)sites Ozone <br />' sparging was conducted in accordance with procedures outlined in the AGE prepared Ozone <br /> • Sparging and Additional Monitoring Well .Installation Work Plan, dated 07 October 2002, well <br /> installation was in accordance with Ozone Sparging Work Plan Addendum, dated 28 January2003 <br /> IAdvanced GeoEnvironmental,Inc <br />