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Quarterly Report - December 1995 • 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 and remediation field activities performed at 16 South Cherokee Lane, Lodi, California during the fourth quarter of 1998. 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 hydrocarbon impact on 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 1998. Results of previous investigations are detailed in the Problem Assessment Report (PAR) and the Quarterly Report - March 1996 Analytical results from previous monitoring events are included in Tables 4 and 5 of this report. S 2.0. PROCEDURES Quarterly ground water monitoring was performed on 21 December 1998 in accordance with the Recommended Groundwater Sampling Guidelines established by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD). 2.1. MONITORING WELL PURGE PROCEDURES On 21 December 1998, a Solinst water level meter was used to measure the depth to ground water in the monitoring wells relative to the tops of the well casings (Table 1). Monitoring wells MW-6, MW-7, MW-8, MW-9, MW-11, MW-12 and MW-14 were then purged using a PVC bailer. A minimum of three well volumes of water was removed from each well. Temperature, pH and conductivity of the purge water were measured at two-gallon intervals using an ICM water analyzer and 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 GeoEnvironmental,Inc.