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Sequoia <br />� Analytical <br />Gettler Ryan Inc -Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron # 9-5775 <br />Dublin CA 94568 Project Manager Scott Polston <br />MTBE by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />404 N Wlget Lane <br />Walnut Creek CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequoialabs corn <br />Reported <br />16 -May -00 15 24 <br />Reportmg Spike Source %REC RPD <br />Analyte Result Limit units Level Result %REC Limits RPD Limit Notes <br />Batch OE12023 - EPA 5030B [P/Tl <br />Blank (OE12023-BLK3) Prepared & Analyzed 15 -May -00 <br />Methyl tert-butyl ether <br />ND <br />20 ug/l <br />Surrogate Dibrornofluoromethane <br />LCS (OE12023-BS3) <br />490 <br />500 980 50-150 <br />Prepared & Analyzed 15 -May -00 <br />Methyl tert-butyl ether <br />489 <br />20 ug/1 <br />500 978 70-130 <br />Surrogate Dibromofluoromelhane <br />Matrix Spike (OE12023-MSI) <br />500 <br />Source W005114-62 <br />500 100 50-150 <br />Prepared & Analyzed 09 -May -00 <br />Methyl tert-butyl ether <br />51 7 <br />20 ug/l <br />500 ND 103 60-150 <br />Surrogate Dibromofluoromethane <br />Matrix Spike Dup (OE12023-MSD1) <br />480 <br />Source W005114-02 <br />-500 960 50-150 <br />Prepared & Analyzed 09 -May -00 <br />%lethyl tert-butyl ether <br />580 <br />20 ug/) <br />500 ND 116 60-150 I 1 5 25 <br />Surrogate Dibromofluoromelhane 490 500 980 50-150 0 <br />Sequoia Analytical - Walnut Creek <br />The resulls in this report apply to the samples analyzed in accordance with the chain of <br />custody document This analytical report must be reproduced in its entirety <br />Page 5 of 6 <br />00 <br />