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rQuarterly Report - Third Quarter 2004 . QUICK N SAVE #1 ' 1901 South El Dorado Street, Stockton, California 1.0. INTRODUCTION At the request of 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 Ground water analytical data from the current and previous investigations can be found in Tables 1 and 2 2.0. PROCEDURES On 30 August 2004,four 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 II 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 r2 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 5/8-inch outer diameter, length-discrete polyethylene hose equipped with a ball-valve water tip and Watera-Hydro-Lift 11 pump Each water ' sample was transferred into laboratory-supplied 40-mi 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 GcoEnvironmental,Inc