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�ryl Ground Water Monitoring Report - First Quarter 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 first quarter of 2000. The site and its surroundings are illustrated on Figure 1. Structures and well locations related to the site are shown on Figure 2. 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 first quarter 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. • 2.0. PROCEDURES Quarterly ground water monitoring was performed on 22 and 23 March 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 22 March 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). On 22 and 23 March 2000, wells MW-I through MW-5 were purged using precleaned PVC bailers. Wells MW-6 through MW-14 and EW-1 were purged using a Grundfos submersible purge pump. Approximately 100 gallons of water was removed from EW-1. Approximately four to twelve gallons of water (minimum of three well- volumes) were removed from each of the remaining wells, except MW-3, during purging. Well MW-3 was purged dry after approximately three gallons of water was removed. Temperature, pH and conductivity of the purge water were measured at regular purge-volume intervals using a Hydac water analyzer and the readings were recorded on field logs. Field data and work sheets are included in Appendix A. The purged water was placed in DOT-approved drums and stored on-site. • Advanced GeoEnsironmental,Inc.