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4 4 Sequoia <br />�„� Analytical <br />404 N Wiget i ane <br />Walnut Geek CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequoialabs 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 Deanna L Hmxhrig 29 -Jul -00 17 31 <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />IReporting Spike Source %REC RPD <br />byte Result Lumt Uruts Level Result %REC Limits RPD Limit Notes <br />Batch OG26017 - EPA 5030B [P/TJ <br />ND <br />20 " <br />Blank (OG26017-BLK1) <br />ND <br />Prepared & Analyzed 25 -Jul -00 <br />Ethanol <br />ND <br />500 ug/l <br />tett-Butyl alcohol <br />ND <br />100 " <br />Methyl tat -butyl ether <br />ND <br />20 " <br />Di -isopropyl ether <br />ND <br />20 " <br />Ethyl tett-butyl ether <br />ND <br />20 " <br />tai -Amyl methyl ether <br />ND <br />20 " <br />1,2-Dichloroethane <br />ND <br />20 " <br />Ethylene dibronude <br />ND <br />20 " <br />Surrogate Dibromofluoromethane Soo 500 100 SO -150 <br />Surrogate 1 2-Dichloroethane-d4 510 500 102 50-150 <br />Blank (OG26017-BLK2) Prepared & Analyzed 27 -Jul -00 <br />Ethanol ND 500 ugll <br />tett-Butyl alcohol ND 100 " <br />Mdhyl tent -butyl ether <br />ND <br />20 " <br />Di -isopropyl ether <br />ND <br />20 " <br />Ethyl tet- butyl. ether <br />ND <br />20 " <br />tort -Amyl methyl ether <br />ND <br />20 " <br />42-Dtdilaruethane <br />ND <br />20 " <br />Ethylene dibnoaude <br />ND <br />20 " <br />Surrogde Dtbr+omoftoromedkwe 520 500 104 50-150 <br />Swnogats. 1,2-Dichloroethow-d4 530 500 106 so -ISO <br />LCS (OG26017 BSI) Prepared & Analyzed 25-Ju1-00 <br />Mdhyl tat -butyl ether 533 20 ug/l. 500 107 70-130 <br />S -Mate DlaromoJlteaeometharu 500 " Soo 100 50-150 <br />Swragata 1, 2-Dtchlomedxme-d4 500 Soo 100 so—ISO <br />Sequoia Analytical - Walnut Creels The results in thts report apply to the samples analyzed in accar&mce with the chain of <br />custody document. Tins analytical report must be reproduced to its enhres <br />Page 23 of 26 <br />