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Sequoia <br />Analytical <br />404 N WISet Lane <br />Walnut Creek, CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequaialabs cam <br />Ge ter 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 ) 0 44 <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creep <br />Reporting Spike Source °/aREC RPD <br />Analyte Result Limit Units Level Result %REC Limits RPD Ltmtt Notes <br />Batch 0607014 - EPA 5030B [PIT} <br />Blank (OG07014-BLKI) <br />Prepared & Analyzed 07 -Jul -00 <br />tert-Butyl alcohol <br />ND <br />20 <br />mg/ml Air <br />Methyl tert-butyl ether <br />ND <br />050 <br />" <br />Di isopropyl ether <br />ND <br />050 <br />" <br />Ethv( tert-butyl ether <br />ND <br />050 <br />" <br />telt-Amyl methyl ether <br />ND <br />050 <br />Surrogate Dibromofluoromelhane <br />520 <br />SO 0 104 50-150 <br />Surrogate 12-Dichloroethane-d4 <br />470 <br />" <br />Soo 940 50-150 <br />LCS (OG07014-BSI) <br />Prepared & Analvzed 07 -Jul -00 <br />Methyl tert-butyl ether <br />466 <br />0 50 <br />mg/ml Air <br />Soo 932 70-130 <br />Surrogate Dibromofluoromethane <br />510 <br />500 104 50-150 <br />12 Dichloroethane-d4 <br />480 <br />500 960 50-150 <br />Wrrogate <br />S Dup (OG07014-ESDI) <br />Prepared & Analyzed 07 -Jul -00 <br />Methyl tert-butvl ether <br />498 <br />0 50 <br />mglm3 Air <br />500 996 70-130 664 25 <br />Surrogate Dihromofluoromethane <br />530 <br />500 106 50.150 <br />Surrogate I 1-Dtchloroethane-d4 <br />510 <br />500 101 50-150 <br />Batch 0G07018 - EPA 5030B [PIT] <br />Blank (OG07018-BLKI) <br />Prepared & Analyzed 06 -Jul -00 <br />Ethanol <br />ND <br />500 <br />ugll <br />ten Butyl alcohol <br />ND <br />100 <br />" <br />Methyl tert butyl ether <br />ND <br />20 <br />" <br />Dr -isopropyl ether <br />ND <br />20 <br />" <br />Ethyl tert-butvl ether <br />ND <br />20 <br />" <br />tert-Amyl methyl ether <br />ND <br />20 <br />1,2-Dichloroethane <br />ND <br />20 <br />" <br />Ethylene drbromide <br />ND <br />20 <br />" <br />Surrogate Dtbromofluoromethime <br />480 <br />500 960 50-150 <br />Surrogate 1 2 Dichloroethone-d4 <br />430 <br />500 860 50-150 <br />I &,quoa Analytical - Walnut Creek <br />The results in thrs report apply to the samples analyzed in accordance with the chain of <br />custody document This analytical report must be reproduced rn its entirety <br />Page 16 of 25 <br />