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Ground Water Monitoring Report - January 2000 Geweke Land Development & Marketing 16 South Cherokee Lane, Lodi, California 1.0. INTRODUCTION AND SCOPE OF WORK At the request of Geweke Land Development & Marketing (GLDM), and in accordance with Cleanup and Abatement Order No. 93-701,Advanced GeoEnvironmental, Inc. (AGE) has prepared this report of monitoring field activities performed at 16 South Cherokee Lane, Lodi, California during the fourth quarter of 1999 and the first month of 2000. The site and its surroundings are illustrated on Figure 1 - Vicinity Map. Structures and well locations related to the site are shown on Figure 2 - Site Plan. The scope of work covered by this report was to collect ground water samples for analysis to characterize the current status of the hydrocarbon impact to ground water, to summarize the progress of the in-situ bioremediation project, and to document monitoring activities at the site during the fourth quarter of 1999 and first month of 2000. Results of previous investigations are detailed in the Problem Assessment Report(PAR), the Quarterly Report-March 1996 and the Quarterly Report - March and June 1999. Analytical results from previous monitoring events are included in Tables 2, 3, 5 and 6 of this report. i� 2.0. PROCEDURES Quarterly ground water monitoring was performed on 18 January 2000. Field work was performed in accordance with PHS-EHD and Central Valley Regional Water Quality Control Board (CVRWQCB) guidelines for the investigation of underground storage tank (UST) sites. 2.1. MONITORING WELL PURGE PROCEDURES On 18 January 2000, a Solinst water level meter was used to measure the depth to ground water in fifteen wells relative to the tops of the well casings (Table 1). Wells MW-6,MW-7, MW-8, MW-9, MW-11, MW-12 and MW-14 were then purged using a Grundfos submersible purge pump. Approximately nine to twelve gallons of water (minimum of three well-volumes) were removed from each well during purging. Temperature, pH and conductivity of the purge water were measured at three-gallon intervals using a Hydac water analyzer and the readings were recorded on field logs. The percent dissolved oxygen was measured in the final purged water of each well. Field data and work sheets are included in Appendix A. The purged water was placed in DOT-approved drums and stored on-site. Advanced Geo Environmental,Inc.