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I ' Quarterly Report - First Quarter 2002 PACIFIC MINI-MART ' 4511 Pacific Avenue, Stockton, California ' 1.0. INTRODUCTION AND SCOPE OF WORK At the request of Mr Art Wyatt, Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for the site located at 4511 Pacific Avenue, Stockton, California (the site) The location of the site is illustrated in Figure 1, structures,monitoring well and soil boring locations are illustrated in Figure 2 The site history and a description of previous work performed at the site were detailed in the AGE- prepared Quarterly Report-March 1996, dated 30 April 1996 Findings from the latest soil and grab ground water sampling event were detailed in the AGE-prepared Quarterly Report - June 1998, dated 22 December 1998 The field procedures for the work reported herein were performed in accordance with procedures outlined in the AGE-prepared Monitoring Well Installation and Interim Ground Water Remediation, dated 26 October 2000, and approved by the San Joaquin County Environmental Health Department (EHD) by letter dated 01 November 2000 Data from previous ground water monitoring events are included in the tables of this report • The scope of work included operation and maintenance of a shallow ground water extraction system ' and monitoring of the ground water monitoring well network on the site and off the site This report documents the operation of a low-flow ground water remediation system, the procedures for collection and analysis of ground water samples from the well network and the results of a ground water and treatment system monitoring events r2 0. GROUND WATER MONITORING PROCEDURES I On 14 and 15 February 2002, a quarterly ground water monitoring and sampling event was conducted on the monitoring well network Field procedures were performed in accordance with procedures outlined in Monitoring Well Installation and Interim Ground Water Remediation 2 1 WELL MONITORING AND EVACUATION On 14 February 2002, a Soiinst water levet meter was used to measure the depth to ground water in monitoring wells MW-1 through MW-16 and vapor well VW1 On 14 and 15 February 2002, a minimum of 3 casing-water volumes were purged from each well to be sampled using a PVC submersible two-stage pump or disposal bailer or the wells were purged dry as occurred in well MW-9 Temperature, pH and conductivity of purged ground water were • measured at various intervals, depending on the volume of water in each well, using an or Oakton water analyzers The field data and field sheets are included in Appendix A Purged water was ' Advanced GeoEnvironmental Inc I