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IQuarterly Monitoring Report - Fourth Quarter 2002 <br /> FIRE STATION #2 <br /> I110 West Sonora Street, Stockton, California <br /> 1.0 INTRODUCTION AND SCOPE OF WORK <br /> I 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 /> Ilocations associated with the site are depicted in Figure 2 <br /> The fourth quarter ground water monitoring event was conducted on 31 December 2002, however, <br /> I because monitoring well MW-5 was unaccessible, this well was not monitored and sampled until <br /> 03 January 2003 To determine time-consistent ground water elevations and gradient, the depth to <br /> water in monitoring wells MW-1 through MW-5 was measured on 13 January 2003 <br /> IThe soil vapor extraction and air-sparging system that was in operation since October 2001 were <br /> removed from the site on 30 August 2002 for site redevelopment <br /> • 2.0. PROCEDURES <br />' FieldP rocedures for ground water sampling are described below All field work was performed in <br /> accordancewith Central Valley Regional Water Quality Control Board(CVRWQCB)guidelines for <br /> the investigation of underground storage tank (UST) sites <br /> I21 WELL MONITORING AND EVACUATIONS <br /> I A Solinst water level meter was used to measure the depth to ground water in monitoring wells MW- <br /> 1 and MW-3 and vapor wells VW-1, VW-2d, VW-3 and VW-5d on 31 December 2002, and <br /> monitoring well MW-5 on 03 January 2003 After water levels were gauged, a dedicated disposable <br /> bailer was used to purge these wells of a minimum of three casing-water volumes (approximately <br /> 3 to 16 gallons) of ground water Temperature, pH, and conductivity were measured at regular <br /> intervals during purging using an Oakton model water analyzer Purged water from impacted wells <br /> was stored on-site in 55-gallon drums The field data sheets are included in Appendix A <br /> On 13 January 2003, depth to ground water was re-measured in monitoring wells MW-1 through <br /> I MW-5 with the Solinst water level meter The groundwater elevations and gradient were determined <br /> from this data (Table 1) <br /> Advanced GcoEnvironmenW,Inc <br />