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Sequoia <br />� Analytical <br />settler Rvan int, -Dublin <br />6747 Sierra Court Suite 1 <br />Dublin CA 94568 <br />Project Chevron <br />Project Number Chevron SS#19-5775 <br />Project Manager Scott Polston <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />404 N Wlget Lane <br />Walnut Geek CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequolalabs corn <br />Reported <br />25 -Apr -00 17 37 <br />Reporting Spike Source %REC RPD <br />Analyte Result Limit Units Level Result %REC Limits RPD Lumt Notes <br />Batch OD21021 - EPA 5030B [P/TJ <br />Matrix SpEke Dup (OD21021-MSD1) Source W004314-01 Prepared & Analyzed 20 -Apr -00 <br />Methvl tw-butyl ether 61 l 2 0 ug/i 500 ND 122 60-150 12 0-2 5 <br />Surrogate Dibromofluoromerhone 460 500 920 50-150 <br />Surrogate 12 Dichloroethane-d4 440 500 880 50-150 <br />Batch OD24015 - EPA 5030B fPPTI <br />Blank (OD24015-BLKI) Prepared & Analyzed 21 -Apr -00 <br />ter[ Butyl alcohol ND 20 mg/ml Air <br />Methyl tent-butvl ether ND 050 <br />Di isopropyl ether ND J 50 <br />Ethyl tent -butyl ether ND 050 <br />tett-Amyl methyl ether ND 050 <br />Surrogate Dibrotnofluoromethane 480 500 960 50-150 <br />6;9-11 <br />1 2-Dichloroethane-d4 370 Soo 740 50-150 <br />LCS (OD24015-BSI) Prepared & Analyzed 21 -Apr -00 <br />Methyl tett-butyl ether 550 0 50 mg/ml Air 500 110 70-130 <br />Surrogate Dibromofluoromethane 490 Soo 980 50-150 <br />Surrogate 1 2-Dichloroethane-d4 450 500 900 50.150 <br />LCS Dup (OD24015-BSD1) Prepared & Analyzed 21 -Apr -00 <br />Mdhvi tut -butyl ether 447 0 50 mghn' Air 500 894 70-130 207 25 <br />Surrogate Dtbromgjlvoromethane 530 Soo 106 50.150 <br />Surrogate 1 2-Dichloroethane-d4 510 500 102 50.150 <br />Sequoia Analytical - Walnut Creek The results in this repon apply to the samples analyzed in accordance with the churn of <br />0 custody document This analytical report must be reproduced in its entirety <br />Page 9 of 10 <br />