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1 Geological rec ida la Page 5 ' Groundwater Monitoring Report Project No 723 2 June 21,2000 Stagnant water in the well casing was purged using a Waterra pump as recorded in the field logs (Appendix C) The rate of well purging was monitored The wells were purged of ' approximately 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% Before a sample was collected, the well's water level was allowed to recharge to at least 80% of the initial level The purge water was placed in a properly labeled 55-gallon DOT (Department of Transportation 17-H) approved container and temporarily stored on-site The dedicated Waterra pump was used to collect each monitoring well sample Care was ' exercised while transferring the sample into 40-m1 VOA vials preserved with hydrochloric acid All samples were checked for headspace bubbles, labeled, inserted into foam holders ' and placed into an ice chest cooled to 4°C 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 the field to the laboratory, thereby providing a means to track the movement of the samples and ensure their integrity 1.3 Laboratory Analyses The groundwater samples collected on April 17, 2006, were delivered to California Laboratory Services of Rancho Cordova, California (certification #1233) for analyses of ' ❑ Benzene, Toluene, Ethyl Benzene, and Xylene (BTEX) by EPA method 8260B ❑ Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method 8015M ❑ MTBE, DIPE, ETBE, TAME, TBA, 1,2 DCA, EDB by EPA method 8260B The detection lirruts for the above analyses are listed in Table 5 of Appendix A, while the lab analytical results are presented in Appendix B As required under AB2886, groundwater elevation and laboratory data were submitted q electronically to GeoTracker on June 16, 2006 - confirmation numbers 3325439274 & ' 6115549802, respectively ' 2.0 FINDINGS AND DISCUSSION ' Groundwater samples were obtained from the existing wells and from the top three screened intervals in each of the CMVm wells 1 The results of the groundwater sample analyses indicate the following