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N1 \l <br /> 404 N. get Lane <br /> ` Sequoia Walnut Geek,CA 94598 <br /> (925)988-9600 <br /> 4FAX(925)988-9673 <br /> Iwo Analytical www,sequolalabs.com <br /> Gettler Ryan,Inc.-Dublin Project: Chevron <br /> 6747 Sierra Court Suite 7 Project Number: Chevron#9-4275 Reported: <br /> Dublin CA,94568 Project Manager: Deanna L.Harding 15-Mar-01 10:45 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1 CO5013-EPA 5030B(PIT) <br /> LCS(1C05013-BS2) Prepared&Analyzed:06-Mar-01 <br /> Methyl telt-butyl ether 54.5 2.0 ug/l 50.0 109 70-130 <br /> Surrogate:Dibromofluoromethane 51.4 50.0 105 50-150 <br /> Surrogate: 1,2-Dichloroethane-d4 48.3 50.0 96.6 50-150 <br /> LCS Dup (1C05013-BSD1) Prepared&Analyzed: 02-Mar-01 <br /> Methyl tart-butyl ether 46.7 2.0 ug/1 50.0 93.4 70-130 3.37 200 <br /> Surrogate::Dibromofluororneihane 50.0 SQ 0 100 `50450_. <br /> Surrogate:1,2-Dichloroethane-d4 50.0 50.0 100 50-150 <br />-Matf Spike(1C05013:MS1) Source, W102669-02 Prepared&Analyzed:06-Mar-01 <br /> Methyl tett-butyl ether 47.3 2.0 ug/1 50.0 19 56.6 60-150 Q-02 <br /> Surrogate:Dibromofluoromethane 49.3 50 0 98.6 50-150 <br /> Surrogate.1.2-Diehloroerhane-d4 44.6 50.0 89.1 50-150 <br /> Matrix Spike Dup (IC05013-MSDI) Source:W102669-02 Prepared&Analyzed:06-Mar-01 <br /> Methyl tort-butyl ether 54.6 2.0 ug/1 50.0 19 71.2 60-150 14.3 25 <br /> Surrogate:Dibromofluoromethane 53.0 50.0 106 50-150 <br />-Surrogate:-I.2-Dichloroethane-& - 46.0 - - T - `50.0 92.0- 56:156 - - - - - -- -- ,--- <br /> Sequoia Analytical-Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain o <br /> custody document. This analytical report must be reproduced in its entiretb <br /> Page 13 of 14 <br />