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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 />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />404 N WISet Lane <br />Walnut Creek CA 94598 <br />(9Z5) 988-9600 <br />FAX (925) 988-9673 <br />www sequoialabs com <br />Reported <br />09 -May -00 1121 <br />Reporting Spike Source %REC RPD <br />Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OE05016 - EPA 5030B [PIT] <br />Matrix Spike Dup (OE05016-MSD1) Source W005093-01 Prepared 05 -May -00 Analyzed 08 -May -00 <br />Methyl tert butyl ether 570 20 ugil 500 ND 114 60-150 879 25 <br />Surrogate Drbromofluoromethane 500 Soo 100 50.150 <br />Surrogate 12 Dichloroethane-d4 500 500 100 50-150 <br />Batch OE08023 - EPA 5030B [P/Tl <br />Blank (OE08023-BLKI) <br />480 <br />Prepared & Analyzed 08 -May -00 <br />tert-&rtyl alcohol <br />ND <br />20 mg/nil Air <br />Methyl tett-butyl ether <br />ND <br />050 " <br />Di -isopropyl ether <br />ND <br />050 <br />Ethyl teri-butyl ether <br />ND <br />050 " <br />tert-Amyl methyl ether <br />ND <br />050 " <br />Surrogate Dlbrome luoromethane <br />480 <br />500 960 50-150 <br />Surrogate 1 2-Dichloroethane-d4 <br />Soo <br />Soo 100 50-150 . <br />LCS (OE08023-BS1) <br />Prepared & Analyzed 08 -May -00 <br />Methyl tert-butyl ether <br />584 <br />0 50 mg/nO Atr 500 117 70-130 <br />Surrogate Dibromofluoromethane <br />490 <br />500 980 50-150 <br />Surrogate 12-Dichloroelhane-d4 <br />500 <br />500 100 50-150 <br />LCS Dup (OE08023-BSD1) <br />Prepared & Analyzed 08 -May -00 <br />Methyl tent -butyl ether <br />600 <br />0 50 mg/m' Air 500 120 70-130 270 25 <br />Surrogate Dibromofluoramethane <br />490 <br />Soo 980 50-150 <br />Surrogate 1 2-Dichloroethane-d4 <br />470 <br />Soo 940 50-150 <br />Sequoia Analytical - Walnut Creek The results in this repots apply to the samples analyzed rn accordance with the thorn of <br />custody document This analytical report must be reproduced in its entirety <br />Page 10 of 11 <br />:*] <br />