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QSequoia <br />� Analytical <br />404 N target Lane <br />Walnut Creek CA 94598 <br />(925) 988-96W <br />FAX (925) 988-9673 <br />www sequoialabs corn <br />'Mttler Ryan Inc -Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron # 9-5775 Reported <br />Dublin CA 94568 Project Manager Scott Polston 01 -Jun -00 1105 <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creep <br />Reporting Spike Source %REC RPD <br />Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OE30023 - EPA 50308 [P/TJ <br />Matrix Spike Dup (OE30023-MSDI) Source W005627-01 Prepared 28 -May -00 Analyzed 29 -May -00 <br />%lethyl tert hutyl ether 272 20 Ug/1 500 220 104 60-150 845 25 <br />Surrogate Dibromofluorornethane 540 500 108 50150- <br />Surrogate <br />01501urrogate 12 Drchloroethane da 600 500 110 50-150 <br />uoia Analytical - Walnut <br />The results in this report apply to the samples analyzed in accordance with the chain of <br />custody document This analytical report must be reproduced rn its entirety <br />Page 6 of 7 <br />