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Sequoia <br />� Analytical <br />404 N Wiget Lane <br />Walnut Creek CA 94598 <br />(925) 988-9600 <br />FAX (9Z5) 988-9673 <br />www sequoialabs Com <br />Gertler Rvan Inc - Dublin Project Chevron <br />6747 Sierra Court Suite I Project Number Chevron # 9-5775 Reported <br />Dublin CA 94568 Project Manager Scott Polston 18 -Apr -00 11 39 <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />tnalyte Result Limit pmts Level Result %REC Limits RPD Limit Notes <br />Batch OD14016 - EPA 5030B [P/TJ <br />500 <br />500 <br />100 <br />70-130 <br />Surrogate 1 2-Dichloroethane-d4 <br />LCS (OD 14016 -BS 1) <br />500 <br />910 <br />Prepared & Analyzed 14 -Apr -00 <br />Surrogate Toluene -d8 <br />480 <br />Surrogate Toluene -d8 <br />500 <br />70.130 <br />mgim'Air 500 100 70-130 <br />480 <br />500 <br />Surrogate 4-Bromofluorobetrene <br />460 <br />500 910 70-130 <br />LCS Dap {01) 14016 -BSD 1) <br />Prepared & Analyzed 14 -Apr -00 <br />Benzene <br />456 <br />050 <br />ma�tns Au 500 91 2 60-140 <br />118 <br />25 <br />Chlorobenzene <br />45 I <br />050 <br />500 902 60-140 <br />909 <br />25 <br />1 1-DiLhloroethene <br />477 <br />0,50 <br />500 954 60-140 <br />391 <br />25 <br />Toluene <br />467 <br />0 50 <br />500 934 60-140 <br />282 <br />25 <br />Trichloroethene <br />46 1 <br />050 <br />500 922 60-140 <br />691 <br />25 <br />Surrogate Dibromofluoromethane <br />500 <br />500 <br />100 <br />70-130 <br />Surrogate 1 2-Dichloroethane-d4 <br />460 <br />500 <br />910 <br />70-130 <br />Surrogate Toluene -d8 <br />480 <br />Soo <br />960 <br />70.130 <br />Surrogate 4-Bromofluorobenzene <br />480 <br />500 <br />960 <br />70.130 <br />• <br />Sequoia Analytical - Walnut Creek The rerulls in this report apply to the samples analyzed in accordance with the charm of <br />custody document This analytical report must be reproduced in its enures <br />Page 21 of 22 <br />