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Report: Groundwater-quality Monitoring—July 14-I5,2006, 7500 West Eleventh Street, Tracy, CA. Page 11 2.3 Recovery of Groundwater Samples from Monitoring Wells After purging, samples were recovered using disposable bailers. Water brought to the surface in the bailers was decanted via discharge spigot valves placed in the bottom of each bailer so as to completely fill clean glassware supplied by the laboratory containing, where applicable, pre-dispensed preservatives. The sample vials were then tightly closed, labeled for identification, entered into chain-of-custody control and packed on chemical ice for transport, within 24 hours, to Severn Trent Laboratories' (STL) laboratory in Pleasanton, California for analysis. 2.4 Analyses of Groundwater Samples Each groundwater sample recovered was analyzed at the laboratory for the following suite of analytes. Analyte Method of Anal Total Petroleum Hydrocarbons EPA Method 8015M (quantified as Diesel) with silica gel cleanup Total Petroleum Hydrocarbons EPA Method 8260B (quantified as Gasoline) r Benzene EPA Method 8260B Toluene EPA Method 8260B Ethyl benzene EPA Method 8260B Total Xylene Isomers EPA Method 8260B tertiary-Butyl alcohol EPA Method 8260B Methyl-tertiary butyl ether EPA Method 8260B Di-isopropyl ether EPA Method 8260B Ethyl tertiary-butyl ether EPA Method 8260B Tertiary-amyl methyl ether EPA Method 8260B STL is certified to perform the specified analyses by the California Department of Health Services (DHS). The results of the analyses of samples of groundwater are presented in Table 2, which also includes the results of analyses of groundwater samples recovered from all previous sampling rounds. Copies of the laboratory Certificates of Analysis generated from the July 2006 monitoring round are included in Appendix B of this report. sic