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<br /> J(tA Report Number: 33430
<br /> ANALYTICALLLC Date : 6/4/2003
<br /> Subject : 6 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 SP6-(A,B,C,D), SP5-(A,B,C,D),
<br /> SP4-(A,B,C,D), SP1-(A,B,C,D), SP2-(A,B,C,D), SP3-(A,B,C,D)for the analyte Tert-Butanol were outside
<br /> of control limits. This may indicate a bias for the sample that was spiked. Since the LCS recoveries were
<br /> within control limits, no data are flagged. Matrix Spike/Matrix Spike Duplicate Results associated with
<br /> samples SP6-(A,B,C,D), SP5-(A,B,C,D), SP4-(A,B,C,D), SP1-(A,B,C,D), SP2-(A,B,C,D), SP3-(A,B,C,D)
<br /> for the analyte Methyl-t-butyl ether were affected by the analyte concentrations already present in the
<br /> un-spiked sample.Tert-Butanol results for sample SP3-(A,B,C,D) may be biased slightly high and are
<br /> flagged with a U.A fraction of MtBE (typically less than 1%)converts to Tert-Butanol during the analysis.
<br /> We consider this conversion effect to be mathematically significant in samples that contain
<br /> MtBE/Tert-Butanol in ratios of over 20:1.
<br /> tom..
<br /> Approved By: J `I Kiff
<br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-480
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