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ReportNumber: 33432 <br /> AfNfL] IC.�L.L'LCG : Date : 06/11/2003 <br /> Subject: 1 Water Sample and 9 Soil Samples <br /> Project Name : 7-Eleven Store#32262 <br /> Project Number: 77EL.32262.43 <br /> Case Narrative <br /> Matrix Spike/Matrix Spike Duplicate Results associated with samples T4-14.5'., T9-14.0',T5-14,0', T7-10', <br /> - - -1 ' T1-10'for the analyte Tert-Butanol were outside of control limits. This ma <br /> T6-10', T3 1 D, T2 10, T8 0, yt y <br /> indicate a bias for the sample that was spiked. Since the LCS recoveries were within control limits',no <br /> t, data are flagged. Matrix SpikelMatrix Spike Duplicate Results associated with samples T4-14.5', <br /> T9-14.0',T5-14.0', T7-10', T3-10', T2'10%T6-10',T8-10', T1-10'for the analyte Methyl-t-butyl ether were <br /> affected by the analyte concentrations already present in the un-spiked sample. Tert-Butanol results for <br /> samples T1-10', T4-14.5', T5-14.0',T6-10',T7-10' and T8-10'may be biased slightly high and are flagged <br /> with a U.A fraction of MtBE (typically less than I%)converts to Tert-Butanol during the analysis.We <br /> . consider this conversion effect to be mathematically significant in samples that contain MtBElTert-Butanol <br /> in ratios of over 20:1. <br /> Hydrocarbons reported as TPH as Gasoline do not exhibit a typical Gasoline chromatographic pattern for <br /> samples T1-10'and T2-10'. <br /> i <br /> 4 <br /> I <br /> I <br /> I . <br /> Approved By: J"1 Kiff <br /> 80 <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4 . <br /> 1 <br />