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�r I� • Quarterly Report - June 1997 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 second quarter of 1997. The site and its surroundings are illustrated on Figure 1 - Vicinity Map. Structures and well locations are shown on Figure 2 - Site Plan. Ground water and soil monitoring is scheduled on a periodic basis to assess remediation progress and microbiological activities. The scope of work covered by this report was to evaluate the field data and summarize the progress of the in-situ bioremediation project and to document monitoring activities at the site during the second quarter of 1997. Results of previous investigations and monitoring events at the site are detailed in the Problem Assessment Report(PAR) and the Quarterly Report- March 1996. • 2.4. PROCEDURES 2.1. MONITORING WELL PURGE PROCEDURES On 11 June 1997, a Solinst water level meter was used to measure the depth to ground water in each monitoring well (Table 1). Monitoring wells MW-7, MW-8 and MW-14 were purged using a 2-inch diameter submersible pump. Monitoring wells MW-6, MW-9, MW-11 and MW-12 were purged using clean PVC bailers. In accordance with the revised monitoring and reporting program No. 93- 701, monitoring wells MW-1 through MW-5, MW-10, MW-13 and EW-1 were not sampled. A minimum of three well volumes of water was removed from each purged well. Temperature, pH and conductivity of the purge water were measured at regular intervals using an TCM water analyzer. Dissolved oxygen was also measured during purging of each well. Monitoring well stabilization data and field sheets are included in Appendix A. The purge water was placed in DOT-approved drums and stored on-site. 2.2. COLLECTION OF GROUND WATER SAMPLES Water samples were collected from each purged well using disposable plastic bailers. Immediately upon retrieval, the samples were transferred into 40-m1 EPA-approved VOA vials containing 0.5 ml • of 18% hydrochloric acid as a preservative. The samples were stored and transported in a chilled container to McCampbell Analytical, Inc. (MAI), in Pacheco, California, under chain-of-custody. Advanced CeoEnvironmental,Inc.