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k'q KLEINFELDER <br /> I <br /> I <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, SectionA-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 Del Tech personnel to Kleinfelder's office, and subsequently by courier to Sequoia <br /> Analytical Laboratories (Sequoia) of Sacramento, California for chemical analysis. Sequoia is <br /> certified by the California Department of Health Services to perform the requested analyses. The <br /> 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 8020 <br /> • 1,2 DCA by EPA Method 8260 <br /> EDB by EPA Method 8260 <br /> • TBA by EPA Method 8260 <br /> Oxygenates, MTBE, DTPE, ETBE, TAME by EPA Method 8260 <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 /> i <br /> l <br /> 12280-MON/ST02R519 Page 7 of 14 <br /> ©2002,Kleinfelder,Inc September 19,2002 <br />