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NIC] KLEINFELDER <br /> 4.2 GROUNDWATER SAMPLING <br /> Groundwater samples were collected from the previously noted 7 monitoring wells. 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 /> i <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 8015NV8021B <br /> • . 1,2 DCA by EPA Method 8260B <br /> + EDB by EPA Method 8260B <br /> • TBA by EPA Method 8260B <br /> Oxygenates, MTBE (MW-14s and MW-15), DIPE, ETBE, TAME by EPA Method 8260B <br /> (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 /> a <br /> 12280.MON/ST03R897 Page 7 of 12 <br /> 0 2003,Kleinfelder,Inc July 1,2003 <br />