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Sequoia <br />� Analytical <br />404 N Wiget Lane <br />Walnut Creels CA 945% <br />(925)988-9600 <br />FAX (925) 988-9673 <br />www sequoialabs corn <br />Gettler Rydn Inc -Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron # 9-5775 Reported <br />Dublin CA 94568 Project Manager Scott Polston 01 -Jun -00 11 05 <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />knalvte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Bitch OE30023 - EPA 5030B [PITT <br />520 <br />SO 0 104 50-150 <br />Surrogate 1 2-Dichlornelhane-d4 <br />Blank (OE30023-BLKI) <br />500 111 50-150 <br />LCS (OE30023-BS2) <br />Prepared & Analyzed 28 -May -00 <br />cert -Butyl alcohol <br />ND <br />100 ug/l <br />Soo 110 70-130 <br />Methyl tert-butyl ether <br />ND <br />20 <br />Surrogate 12-Diehloroethaine-d4 <br />Di isopropyl ether <br />ND <br />2 0 <br />Source W005627-01 <br />Ethyl tert-butyl ether <br />ND <br />20 <br />500 220 152 60-150 Q01 <br />tert ,amyl methyl ether <br />ND <br />20 <br />Surrogate 12-Dichloroetham-d4 <br />Surrogate Dibroinofluoromethane <br />540 <br />500 108 50-150 <br />Surrogate 1 1-Dichloroethane-d4 <br />580 <br />500 116 50-150 <br />Blank (OE30023-BLK2) <br />Prepared & Analyzed 30 -May -00 <br />tert-Butyl alcohol <br />ND <br />100 ug/l <br />Methyi tert-butyl ether <br />ND <br />20 <br />Di -isopropyl ether <br />Ethyl tert-butyl ether <br />ND <br />ND <br />20 <br />20 <br />. <br />tert-Amyl methyl ether <br />ND <br />20 <br />Surrogate Dibromofluoromethane <br />550 <br />Soo 110 50-150 <br />Surrogate 1 2-Dichloroethaine-d4 <br />600 <br />500 120 50-150 <br />LCS (OE30023-BSI) <br />Prepared & Analyzed 28 -May -00 <br />Methyl tert-butyl ether <br />525 <br />20 ug/I <br />500 105 70-130 <br />Surrogate Dibromofluoromethane <br />520 <br />SO 0 104 50-150 <br />Surrogate 1 2-Dichlornelhane-d4 <br />560 <br />500 111 50-150 <br />LCS (OE30023-BS2) <br />Prepared & Analyzed 30 -May -00 <br />Methyl tert-butyl ether <br />550 20 ugJl <br />Soo 110 70-130 <br />Surrogate Dibromofluoromethane <br />580 <br />500 116 50-150 <br />Surrogate 12-Diehloroethaine-d4 <br />600 <br />Soo 110 50-150 <br />Matrix Spike (OE30023-MSI) <br />Source W005627-01 <br />Prepared 28 -May -00 Analyzed 29 -May -00 <br />Methvi tert-butvl ether <br />296 2 0 ugll <br />500 220 152 60-150 Q01 <br />Surrogate Dibromofluoromethane <br />570 <br />500 114 50-150 <br />Surrogate 12-Dichloroetham-d4 <br />610 <br />Soo 112 50-150 <br />Sequoia Analytical - Walnut Creek <br />The results in this report apply to the samples analyzed in accordance with the chain o� <br />custody document This analytical report must be reproduced in its entirety <br />Page 5 of 7 <br />