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i IQuarterly Report - Fourth Quarter 2002 K& S GAS & GROCERY 701 East Charter Way, Stockton, California I1.0. INTRODUCTION At the request of Mr Khaldoon Othman of K & S Grocery, Advanced GeoEnvironmental, 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 I of this report The site setting is illustrated in Figure 1 Structures and monitoring well locations are illustrated in Figure 2 Background information is summarized in the AGE-prepared Monitoring Well Installation Report, dated 02 June 1999 Data from previous ground water monitoring events are ' summarized in the tables of this report I2.0. PROCEDURES Field work was performed in accordance with guidelines established by the Central Valley Regional IWater Quality Control Board for investigation of underground storage tank (UST) sites '• 2 1 WELL MONITORING AND EVACUATION On 10 October 2002, a Solmst 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, disposable polyethylene bailers were used to evacuate the wells of standing water A minimum of 3 casing-water volumes were removed from each well- ' 10 gallons from MW I and 7 gallons each from MW2 and MW3 Ground water temperature,pH and conductivity were measured at regular purge-volume intervals during the evacuation of MW2 and MW3 using an Oakton water analyzer These measurements were not taken in MW 1 due to the free ' product in the well Field sheets and data are included in Appendix A 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 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 Environmental Laboratories IAdvanced Gco nvironmental,Inc 1