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' Quarterly Report - Second Quarter 2005 <br /> FIRE STATION#2 <br />' 110 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, including a description <br /> of previous work performed at the site and a basic site conceptual model,are detailed in Appendix A <br /> r1 1 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 /> 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 a work plan dated 28 January 2003 <br /> I <br /> 12 AUGMENTED SITE REMEDIATION <br /> An ozone airsparging system was installed 01 July 2003 on-site, utilizing the existing in-situ air <br /> sparging(IAS)system wells IAS-1 through IAS-3 and currently micro sparge well OZ-1 In total,the <br /> ozone system has operated approximately 8,500 hours and has been operational except for core part <br /> replacements (air compressor) <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 <br /> I <br /> • <br /> Advanced GeoEnvironmentai,Inc <br />