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' Quarterly Report - First Quarter 2005 PACIFIC MINI-MART ' 4511 Pacific Avenue, Stockton, California ' 1.0. INTRODUCTION At the request of Mr Art Wyatt, Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for 4511 Pacific Avenue, Stockton, California (site) This report documents the procedures for collection and analysis of ground water samples from the well network and the results of the monitoring event in January 2005 The location of the site is illustrated on Figure 1 IStructures,monitoring well and soil boring locations are illustrated on Figure 2 The site history and a description of previous work performed at the site are detailed in Appendix A Data from previous ground water monitoring events are included in the tables of this report 2.0. PROCEDURES The field procedures were performed in accordance with procedures outlined in the Remedial Action Work Plan, prepared by AGE, dated 22 December 2003, and approved by the San Joaquin County Environmental Health Department (EHD) letter, dated 23 December 2003 • 2 1 WELL MONITORING AND EVACUATION On 17 January 2005, a Solinst water level meter was used to measure the depth to ground water in monitoring wells MW-I through MW-18 The ground water elevation in each well was calculated by subtracting the measured depth to ground water from the surveyed casing elevation (Table 2) IA minimum of three casing-water volumes were purged from wells MW-4, MW-5, MW-6,MW-8, MW-1 IA/B,MW-15,MW-16,MW-17 using a disposable bailerand well MW-18 was purged using a Watera inertia pump with dedicated tubing Temperature,pH and conductivity of purged ground water was measured at various intervals, depending on the volume of water in each well, using an Oakton water analyzer The field data and field sheets are included in Appendix B Purged water was Idischarged into the active ground water treatment system for treatment and disposal 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES A water sample was collected from each monitoring well using anew disposable bailer or the Watera Hydrolift pump with dedicated tubing after allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume Immediately upon retrieval,the samples were transferred into three 40-milliliter (ml) EPA-approved volatile organic analysis (VOA) vials containing 0 5-ml 18% hydrochloric acid(sample preservative) The samples collected were logged on a chain of custody form,placed in a chilled container and transported to Cal Tech Environmental Laboratories(CTEL) Advanced GeoEnvironmental Inc