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Quarterly Report - Fourth Quarter 2003 SUTTER OFFICE CENTER 242 North Sutter Street, Stockton, California ' 1.0. INTRODUCTION I At the request of Ms Juh Lozano of the SUTTER OFFICE CENTER,Advanced GeoEnvironmental, Inc (AGE)has prepared this quarterly report for 242 North Sutter Street in Stockton,California(the site) The scope of work included conducting a quarterly ground water monitoring event and preparation of this report The site setting is illustrated on Figure 1 Site structures, soil boring and monitoring well locations are depicted on Figure 2 This report was prepared in accordance with Central Valley Regional Water Quality Control Board (CVRWQCB)guidelines for the investigation of underground storage tank(UST)sites Site history and findings from previous investigations and monitoring events are provided in Appendix A 2.0 PROCEDURES On 16 October 2003,ground water monitoring and sampling were performed at on-site wells MW-1 through MW-3 The investigation was conducted in accordance with the CVRWQCB and the San Joaquin County Environmental Health Department(EHD)guidelines for the subsurface investigation of UST sites and sampling of ground water monitoring wells 2 1 WELL MONITORING AND PURGING The depth to ground water was measured in each well from the top of the well casing to the nearest 0 01 foot utilizing a Solznst water level meter The ground water elevation was calculated by Isubtracting the measured depth to ground water from the surveyed casing elevation (Table 1) After water levels were measured, disposable, dedicated bailers were used to purge the wells Approximately 5 to 6 gallons of ground water(equivalent to three casing-water volumes) of water were purged from each well Temperature,pH and conductivity were measured for stabilization at regular purge-volume intervals using an Oakton water analyzer Field data and logs are provided in Appendix B Purged ground water was containenzed in 55-gallon drums and was stored on-site, pending proper disposal 2 2 GROUND WATER SAMPLING IWater samples were collected from the monitoring wells using the dedicated,disposable bailers after allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume The sample from each well was transferred into three 40-m1 EPA-approved volatile organic analysis(VOA)vials containing 0 5 ml 18%hydrochloric acid as a sample preservative and a one-liter amber bottle without