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KLEINFELDER <br /> f <br /> 4.2 QUARTERLY GROUNDWATER SAMPLING <br /> F Groundwater samples were collected from the previously noted 9 monitoring wells and 3 <br /> piezometers. The wells and piezometers were purged and sampled as described in Appendix A, <br /> Section A-4.2. The water purged from the wells was contained and left on site within the fenced <br /> Disco Area. <br /> After collection, the groundwater samples were labeled, logged on a chain-of-custody, and <br /> ! immediately stored in an iced cooler. The samples were transported under chain-of-custody <br /> control by courier to Sequoia Analytical Laboratories (Sequoia) of Sacramento, California for <br /> chemical analysis. Sequoia is certified by the California Department of Health Services to <br /> perform the requested analyses. The groundwater samples were analyzed for the following: <br /> • Total Petroleum Hydrocarbons-gasoline (TPH-g) by DHS LUFT <br /> • Benzene, Toluene, Ethylbenzene, Xylene (BTEX) by EPA Method 8015M/8021B <br /> • 1,2 DCA by EPA Method 8260B <br /> • EDB by EPA Method 8260B <br /> .• TBA by EPA Method 8260B - <br /> • Oxygenates, MTBE, DIPE, ETBE, TAME by EPA Method 8260B (MW-DIS-15 only) <br /> The samples were analyzed on a regular laboratory turnaround schedule, requiring approximately <br /> 7 to 10 working days for receipt of analytical data. <br /> r <br /> t <br /> 12280.MON/ST04R397 Page 8 of 13 <br /> ®2004,Kleinfelder,Inc May 11,2004 <br /> IC <br /> I <br />