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1 - <br />' Quarterly Report - Fourth Quarter 2005 <br /> . PACIFIC MINI-MART <br />' 4511 Pacific Avenue, Stockton, California <br />' 1.0. INTRODUCTION <br /> At the request of Mr Art Wyatt, Advanced GeoEnvlronmental, 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 ground water samples from the well network and the results <br /> of the monitoring event in November 2005 The location of the site is illustrated on Figure 1 <br /> Structures,monitoring well and soil boring locations are illustrated on Figure 2 The site history and <br /> a description ofprevious work performed at the site are detailed in Appendix A Data from previous <br />' ground water monitoring events are included in the tables of this report <br />' 2.0. PROCEDURES <br /> Field work was performed in accordance with guidelines issued by the Central Valley Regional <br /> Water Quality Control Board(CVRWQCB)for the investigation of underground storage tank(UST) <br /> sites This report was prepared under the supervision of a registered geologist <br /> 2 1 WELL MONITORING AND EVACUATION <br />' On 09 November 2005, a Solinst water level meter was used to measure the depth to ground water <br /> in monitoring wells MW-1 through MW-18 The groundwater elevation in each well was calculated <br /> by subtracting the measured depth to ground water from the surveyed casing elevation (Table 2) <br />' On 09 November 2005, a minimum of three casing-water volumes were purged from vapor well <br /> VW-1 and monitoring wells MW-4 through MW 10, MW-I IAB, MW-15,MW-16, MW-17 using <br />' a disposable bailer and well MW-18 was purged using a Watera Hydrolift pump with dedicated <br /> tubing Temperature,pH and conductivity of purged ground water was measured at various intervals, <br /> depending on the volume of water in each well, using an Oakton water analyzer The field data and <br />' field sheets are included in Appendix B Purged water was discharged into the active ground water <br /> treatment system for treatment and disposal <br /> 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> A water sample was collected from each monitoring well using a new 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 1-liter amber bottles without preservative The samples <br /> Advanced GeoEnvironmental,Inc <br /> I <br />