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• Quarterly Report - Third Quarter 2002 GEWEKE LAND DEVELOPMENT & MARKETING ' 16 South Cherokee Lane, Lodi, California i1.0. 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 field activities performed at 16 South Cherokee Lane,Lodi,California during the third ' quarter of 2002 The site and its surroundings are illustrated on Figure 1 Monitoring well and boring locations related to the site are shown on Figures 1 and 2 ' The scope of work covered by this report includes one quarterly ground water monitoring event 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 ' for ground water samples from previous monitoring events are included in Table 3 of this report ' 2.0. PROCEDURES In accordance with the Revised Monitoring and Reporting Program, dated 27 June 2001, fifteen ' • wells were monitored and five wells were sampled on 16 September 2002 The Field work was performed in accordance with San Joaquin County Environmental Health Department (EHD) guidelines for sampling ground water monitoring wells and Central Valley Regional Water Quality ' Control Board(CVRWQCB)guidelines for investigations of underground storage tank(UST)sites ' 2 1 WELL MONITORING AND EVACUATION 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) After depth measurements, wells MW-7, MW-8, MW-9, MW-12 and MW-14 were purged using new disposable plastic bailers Between 6 and 8 gallons of water (a minimum of 3 casing-water volumes per well) were removed from each of the wells Temperature, pH and conductivity of the purge water were measured at regular purge-volume intervals using an Oakton water analyzer and the readings were recorded on field logs Field data and work sheets are included in Appendix A The purged water was containerized in 55-gallon Department of Transportation (DOT)-approved drums and stored on-site I 22 COLLECTION OF GROUND WATER SAMPLES IThe depth to water was remeasured after purging to ensure a minimum of 80 per cent recharge of the initial water level in each well prior to sampling Afterwards,a water sample was collected from IAdvanced GeoEnvironmental,Inc