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KL E I N F E L D E R <br /> 4.2 GROUNDWATER SAMPLING <br /> Groundwater samples were collected from the 12 monitoring wells previously noted. The wells <br /> were purged and sampled as described in Appendix A, Section A-4.2. The water purged from the <br /> wells was contained 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 LUFT <br /> a 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 <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 /> I <br /> 12280.MON/ST0311524 Page 7 of 12 <br /> ®2003,Kleinfelder,Inc May 6,2003 <br /> i <br />