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Citelogical recknlcsInc. Page 5 ' Additional Site Characterization and 3rd Quarter Groundwater Monitoring Project No.989.2 October 31,2002 ' The detection limits for these compounds are listed in the data table, Table 2 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 September 6, 2002. The confirmation number for the electronic submittal is ' 5128278017. 2.3 Groundwater Investigation 2.3.1 Groundwater Sampling Procedure Del-Tech Geotechnical Support personnel mobilized to the site on three separate occasions during this quarter. On August 19, 2002, Del-Tech personal arrived on site and developed the four new monitoring wells. On August 22, 2002, Del-Tech personal arrived on site, opened the four new monitoring wells and measured the depth to water with an electrically actuated sounding tape. On September 26, 2002, Del-Tech personal arrived on site, opened ' the original six monitoring wells (MW-1 through MW-6) 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. No floating product was observed during this sampling event. ' 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 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%. Oxidation-Reduction Potential (ORP) was recorded during the sampling event. The ' ORP and groundwater parameters are included as Table 3. 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. Extreme care was exercised while collecting samples to prevent agitation of the water contained in the Waterra pump. With minimal sample aeration, water samples were transferred from the pump into 40-m1 VOA vials preserved with hydrochloric acid. All samples were checked for headspace bubbles, labeled, inserted into foam holders and placed into a cooled ice chest for transport to the laboratory. The sampling technician wore disposable gloves while collecting all samples. A chain of custody document, listing all samples collected and their intended analyses, ' accompanied the samples from field to the laboratory, thereby providing a means to track the movement of and ensure the integrity of the samples.