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GeologicalTechnkslnc. Page 5 ' Well Installation and Quarterly Groundwater Monitoring Report . Project No. 1030.2 ' June 18,2002 The detection limits for these compounds are listed in the data table, Table 3 of Appendix ' A. A Chain of Custody was completed for all samples collected and tracked to ensure sample integrity. Laboratory data sheets are included in Appendix D. ' The laboratory data were submitted electronically to GeoTracker as required under AB2886 on May 16, 2002. The confirmation numbers for the electronic submittal are 1719836235 ' and 4668563485. 2.3 Groundwater Investigation. ' 2.3.1 Groundwater Sampling Procedure On May 8, 2002, Del-Tech Geotechnical Support personnel arrived on-site, opened the wells and measured the depth to water with an electrically actuated sounding tape. The water level reading was recorded to an accuracy of 0.01 foot. If free floating product had been suspected, a clear disposable bailer would have been used to gauge the interface. No floating product was observed during this sampling event. On June 11, 2002, Del-Tech Geotechnical Support personnel arrived on-site and measured the depth to water with an electrically actuated sounding tape. The water level reading was recorded to an accuracy of 0.01 foot. The depth to water measurements taken on May 8, ' 2002, indicated that the groundwater bearing had changed dramatically. The faulty result was due to a computer error on the field logs from Del-Tech Geotechnical Support. Accurate measurements (Table 1) and field logs (Appendix C) are attached. ' Stagnant water in the well casing was purged using a dedicated Waterra pump. The rate of well purging was monitored. The well was purged of at least three casing volumes and also ' until the groundwater parameters (temperature, conductivity and pH) had stabilized (Appendix C) indicating that water representative of actual aquifer conditions was entering the well. Groundwater parameter stabilization was characterized by three successive ' readings within 10%. Before a sample was collected, the well's water level was allowed to recharge to at least ' 80% of its initial level. All water removed from the monitoring well and not used as a sample was placed in a 55 gallon DOT approved container that is properly labeled and temporarily stored on-site. A dedicated Waterra pump was used to collect each sample. Pump cleanliness was assured ' by collecting a bailer blank (pouring distilled water through the pump and collecting it in a VOA vial) prior to collecting the analytical sample.