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' Quarterly Report - Fourth Quarter 2004 • QUICK N SAVE N1 1901 South El Dorado Street, Stockton, California , ' 1.0. INTRODUCTION At the request of Mr Zeb Khan, Advanced GeoEnvironmental, Inc (AGE) has prepared this ' quarterly report for the property located at 1901 South El Dorado Street, Stockton, California(site) The site and the surrounding area are illustrated on Figure 1 Structure,boring and well locations are illustrated on Figure 2 Site background information is summarized in Appendix A Groundwater analytical data from the current and previous investigations can be found in Tables 1 and 2 ' 2.0. PROCEDURES ' On 17 November 2004, ground water monitoring wells MW-1 through MW-4 were monitored and sampled Field work was performed in accordance with guidelines issued by the Central Valley Regional Water Quality Control Board(CVRWQCB) for the investigation of underground storage tank(UST) sites ' . 2 1 WELL MONITORING AND EVACUATION The depth to ground water in each monitoring well was measured from the top of the well casing to ' the nearest 0 01-foot utilizing a Solinst water level meter Ground water elevation in each well was calculated by subtracting the measured depth to ground water from the surveyed casing elevation (Table 1) After water levels were measured, between 6 0 and 12 0 gallons of water (a minimum of 3 casing- water volumes per well)were purged from monitoring wells MW-1 through MW-4 using a Watera- ' Hydro-Lift I1 pump equipped with a mechanical arm utilized to surge each well with a dedicated polyethylene hose Ground water temperature, pH and conductivity were measured at regular intervals during purging using an Oakton water analyzer Field sheets and data are included in ' Appendix B Purged water was stored on-site in properly labeled, 55-gallon DOT-approved drums ' 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES ' After allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume,water .samples were collected from each purged well utilizing 518-inch outer diameter, length-discrete polyethylene hose equipped with a ball-valve water tip and Watera-Hydro-Lift 11 pump Each water I sample was transferred into laboratory-supplied 40-m1 volatile organic analysis (VOA) vials containing 0 5 ml of hydrochloric acid as preservative After collection, the samples were properly labeled, placed in a chilled container and transported under chain of custody to Cal Tech Advanced GeoEnvironmentai,Inc