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Sequoia <br />� Analytical <br />Gettler Rvan Inc - Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron # 9-5775 <br />Dublin CA, 94568 Project Manager Scott Polston <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />404 N Wiget Lane <br />Walnut Creek CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequoialabs com <br />Reported <br />18 -Apr -00 11 39 <br />Reporting Spike Source %REC RPD <br />Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OD14016 - EPA 5030B [PIT] <br />500 <br />500 <br />100 <br />70-130 <br />LCS (OD14016-BSI) <br />460 <br />500 <br />Prepared & Analyzed 14 -Apr -00 <br />70-130 <br />Surrogate Toluene -d8 <br />500 <br />Soo <br />mg/rn' Air 500 100 70-130 <br />70-130 <br />Surrogate 4-Bromofluorobereene <br />460 <br />500 <br />500 920 70-130 <br />70.130 <br />LCS Dup (OD14016-BSD1) <br />Prepared & Analyzed 14 -Apr -00 <br />Benzene <br />45 6 <br />0 50 <br />rng/m' Air 500 91 2 60-140 <br />118 <br />25 <br />Chlorobenzene <br />451 <br />0 50 <br />500 90 2 60-140 <br />8 09 <br />25 <br />1 I-DiLhIoroethene <br />477 <br />0 50 <br />500 95 4 60-140 <br />391 <br />25 <br />Toluene <br />467 <br />050 <br />500 93 4 60-140 <br />282 <br />25 <br />Trichloroethene <br />46 1 <br />0 50 <br />500 922 60-140 <br />691 <br />25 <br />Surrogate Dibrontofluoromethate <br />500 <br />500 <br />100 <br />70-130 <br />Surrogate 1 2-Dichloroethane-d4 <br />460 <br />500 <br />920 <br />70-130 <br />Surrogate Toluene -d8 <br />480 <br />Soo <br />960 <br />70-130 <br />Surrogate 4-Bromofiuorobenzene - <br />480 <br />500 <br />960 <br />70.130 <br />Sequoia Analytical - Walnut Creek 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 in its entiretyo <br />Page 21 of 22 <br />