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1 <br /> KLEINFELDER <br /> I <br /> 4.2 QUARTERLY GROUNDWATER SAMPLING <br /> I <br /> Groundwater samples were collected from the previously noted seven monitoring wells. The <br /> wells were purged and sampled as described in Appendix A, Section A-4.2. The water purged <br /> from the wells was contained and labeled and left on site within the fenced 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 LLTFT; <br /> • Benzene, Toluene, Ethylbenzene, Xylene (BTEX)by EPA Method 8015M18021B; <br /> • 1,2 DCA by EPA Method 8260B; <br /> • EDB by EPA Method 8260B; <br /> • TBA by EPA Method 8260B; and <br /> + Oxygenates, MTBE, DIPS, 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 /> 1 , <br /> I ! <br /> 12280-M0N/ST05R173/JZ:1v Page 7 of 1 <br /> 0 2005,Kleinfelder, Inc. February 11,2005 <br />