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� 4 <br /> I LABORATORY ANALYSES <br /> The groundwater samples were transported to Sequoia Analytical, a state-certified <br /> laboratory, located in Redwood City, California. Groundwater samples were analyzed <br /> for the presence of TPH-G following Environmental Protection Agency (EPA) Method <br /> 8015 Modified, MTBE and BTEX following EPA Method 8020 The California Regional <br /> Water Quality Control Board has requested testing for MTBE using EPA Method 8020 <br /> (State of California, May 2, 1995) According to the analytical laboratory, testing for <br /> MTBE using EPA Method 8020 can result in false positives When analyzing for <br /> MTBE, EPA Method 8240 is a more accurate analyses, however, by comparison EPA <br /> Method 8240 is a more expensive analyses Therefore, when MTBE is detected a <br /> confirmation analyses will be run on the sample with the highest detectable MTBE <br /> concentration When there is a difference between the MTBE concentration using <br /> EPA Method 8020 and EPA Method 8240, the EPA Method 8240 concentration will <br /> be used In addition, at the request of the SJCPHS, the samples were analyzed for <br /> the presence of carbon dioxide The certified laboratory reports and chain of custody <br /> records are included in Appendix D <br /> • <br /> MVIW%94 2731 M 132 RPT 123 Apr 061 � H <br />