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• Quarterly Report - Second Quarter 2003 K& S GAS & GROCERY 701 East Charter Way, Stockton, California ' 10. INTRODUCTION ' At the request of Mr Khaldoon Othman of K & S Grocery, Advanced Geo Environmental, Inc (AGE)has prepared this quarterly report for the property located at 701 East Charter Way,Stockton, California The scope of work included a quarterly ground water monitoring event and preparation ' of this report The site setting is illustrated in Figure 1 Structures and monitoring well locations are illustrated in Figure 2 Site background information is summarized in Appendix A Data from previous ground water monitoring events are summarized in the tables of this report 2.0 PROCEDURES Field work was performed in accordance with guidelines established b the Central Valley Regional p g Y ' Water Quality Control Board for investigation of underground storage tank (UST) sites I2 1 WELL MONITORING AND EVACUATION On 11 April 2003, a Solinst water level meter was used to measure the depth to ground water in ' monitoring wells MW 1 through MW3 relative to the tops of the well casings (well heads) The ground water elevations and gradient were determined from these data and are shown in Table 1 ' After recording water level measurements, a Watera Hydrolift Pump was used to evacuate the wells of standing water A minimum of casing-water volumes were removed from each well, 16 gallons from MW 1 and 9 gallons each from MW2 and MW3 Ground water temperature, pH and ' conductivity were measured at regular purge-volume intervals during the evacuation of MW 1,MW2 and MW3 rising an Oakton water analyzer Field sheets and data are included in Appendix B Evacuated water was stored on-site in properly labeled, 55-gallon Department of Transportation ' (DOT)-approved drums ' 2 2 COLLECTION OF GROUND WATER SAMPLES The depth to ground water was measured in each well following evacuation to assure a minimum ' of 80%recharge prior to sampling Water samples were then collected using new disposable plastic bailers Each water sample was transferred into laboratory-supplied 40-m1 volatile organic analysis ' (VOA) vials containing 0 5 ml 18% hydrochloric acid as a sample preservative The sample vials were then labeled with the monitoring well designation, date, time of sampling and the sampler's • initials The samples were transported in a chilled container under chain-of-custody to Cal Tech I Advanced GeoEnvironmentai,Inc I