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IQuarterly Report - Fourth Quarter 2004 <br /> PACIFIC MINI-MART <br />' 4511 Pacific Avenue, Stockton, California <br />' 1.0. INTRODUCTION <br /> At the request of Mr Art Wyatt, Advanced GeoEnvironmental, Inc (AGE) has prepared this <br /> quarterly report for 4511 Pacific Avenue, Stockton, California (site) This report documents the <br /> procedures for collection and analysis of groundwater samples from the well network and the results <br />' of the monitoring event The location of the site is illustrated on Figure 1 Structures, monitoring <br /> well and soil boring locations are illustrated on Figure 2 The site history and a description of <br /> previous work performed at the site are detailed an Appendix A Data from previous ground water <br />' monitoring events are included in the tables of this report <br />' 2.0. PROCEDURES <br /> The field procedures were performed in accordance with procedures outlined in the Remedial Action <br /> I Work Plan, prepared by AGE, dated 22 December 2003, and approved by the San Joaquin County <br /> Environmental Health Department (EHD) by letter, dated 23 December 2003 <br /> lie 2 1 WELL MONITORING AND EVACUATION <br />' On 29 October 2004, a Solinst water level meter was used to measure the depth to ground water in <br /> monitoring wells MW-1 through MW-18 and vapor well VW-1 The ground water elevation in each <br /> well was calculated by subtracting the measured depth to ground water from the surveyed casing <br />' elevation (Table 2) <br /> A minimum of three casing-water volumes were purged from wells MW-1 through MW-5,MW-8, <br />' MW-11A/B, MW-15, MW-17 and MW-18 using a Watera inertia pump with dedicated tubing or <br /> a disposable bailer Temperature, pH and conductivity of purged ground water was measured at <br /> various intervals, depending on the volume of water in each well, using an Oakton water analyzer <br /> The field data and field sheets are included in Appendix B Purged water was discharged into the <br /> active ground water treatment system for treatment and disposal <br /> 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> A water sample was collected from each monitoring well using anew disposable bailer or the Watera <br /> Hydrolift pump with dedicated tubing after allowing the wells to achieve a minimum 80%recovery <br /> of the pre-purge water volume Immediately upon retrieval, the samples were transferred into three <br /> 40-milliliter (ml) EPA-approved volatile organic analysis (VOA) vials containing 0 5-ml 18% <br /> . hydrochloric acid (sample preservative) and one Miter amber bottle without preservative The <br /> IAdvanced GeoEnvironmental Inc <br /> r <br />