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Sequoia <br />blcp Analytical <br />404 N Wiget Lane <br />Walnut Creek CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequolalabs com <br />Gettler Ryan, inc -Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron # 9-5775 Reported <br />Dublin CA, 94568 Project Manager Scott Polston 25 -Jul -00 11) 44 <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />knalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch 0GO8002 - EPA 5030E {PIT] <br />LCS (OG08002-BSI) <br />Prepared & Analyzed 06 -Jul -00 <br />11-Dichloroethene <br />595 <br />20 <br />ug/l <br />500 <br />119 <br />65-135 <br />Methyl tert-butyl ether <br />539 <br />20 <br />500 <br />108 <br />65-135 <br />Benzene <br />595 <br />10 <br />500 <br />119 <br />70-130 <br />Tnchloroethene <br />55 3 <br />20 <br />500 <br />111 <br />70-130 <br />Toluene <br />537 <br />20 <br />500 <br />107 <br />70-130 <br />Chlorobenzene <br />534 <br />20 <br />500 <br />107 <br />70-130 <br />Surrogate Dibromofluoromethane <br />530 <br />500 <br />106 <br />50-150 <br />Surrogate 1 2-Drchloroethane d4 <br />510 <br />500 <br />102 <br />50-150 <br />Surrogate Toluene-& <br />Soo <br />500 <br />100 <br />50-150 <br />Surrogate 4-Bromofluorobenzene <br />520 <br />500 <br />104 <br />50-150 <br />CS (OG08002-BS2) <br />Prepared & Analyzed 08 -Jul -00 <br />1-Dichloroethene <br />573 <br />20 <br />UO <br />500 <br />115 <br />65-135 <br />Methyl tert-butyl ether <br />567 <br />20 <br />500 <br />113 <br />65-135 <br />Benzene <br />59 1 <br />10 <br />500 <br />118 <br />70-130 <br />Tnchloroethene <br />567 <br />20 <br />500 <br />113 <br />70-130 <br />Toluene <br />559 <br />20 <br />500 <br />1 l2 <br />70-130 <br />Chlorobenzene <br />557 <br />20 <br />500 <br />ill <br />70-130 <br />Surrogate Dibromofluoromethane <br />520 <br />500 <br />104 <br />50-150 <br />Surrogate 12 Dichloroethane-d4 <br />520 <br />500 <br />104 <br />50-150 <br />Surrogate Toluene-& <br />500 <br />500 <br />100 <br />50-150 <br />Surrogate 4-Bromolluorober¢ene <br />520 <br />500 <br />104 <br />50-150 <br />Matrix Spike (OG08002-MSI) <br />Source W006678-18 <br />Prepared & Analvzed 06 -Jul -00 <br />1 1-Dichloroethene <br />509 <br />20 <br />ugll <br />500 ND <br />102 <br />60-140 <br />Methyl tat -but) I ether <br />527 <br />20 <br />500 <br />105 <br />60-140 <br />Benzene <br />527 <br />l 0 <br />500 ND <br />105 <br />60-140 <br />Trichloroethene <br />513 <br />2 0 <br />500 3 1 <br />964 <br />60-140 <br />Toluene <br />46 9 <br />2 0 <br />500 ND <br />919 <br />60-140 <br />Chlorobenzene <br />487 <br />2 0 <br />500 ND <br />974 <br />60-140 <br />Surrogate Dibromofluoromethane <br />53 0 <br />500 <br />106 <br />50.150 <br />Surrogate 12 Diehloroethane-d4 <br />53 0 <br />500 <br />106 <br />50-150 <br />Surrogate Toluene-dS <br />500 <br />500 <br />100 <br />50-150 <br />Surrogate 4-Bromofluorobei¢ene <br />510 <br />500 <br />102 <br />50-150 <br />equoia Analytical - Walnut Creek The results in this report apply to the samples analysed in accordance with the chain of <br />custody document This analytical report must be reproduced in its entirety <br />Page 22 of 25 <br />