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Sequoia <br />•� Analytical <br />1551 Industnal Road <br />San Carlos CA 94070-4111 <br />(650)232-9600 <br />FAX (650) 232-9612 <br />www sequoialabs com <br />Gettler-Ryan/Geostrategies(1) Project Chevron(1) Sampled 7110100 <br />6747 Sierra Court, Suite ] Project Number Chevron 9-5775 Received 7/11100 <br />Dublin, CA 94568 Project Manager Scott Polston Reported 7119100 <br />Volatile Organic Oxygenated Compounds by EPA Method 8260A/Quahty Control <br />Sequoia Analytical - San Carlos <br />Batch 0070050 <br />Blank <br />Ethanol <br />Tert-butyl alcohol <br />Methyl tert-butyl ether <br />Di -isopropyl ether <br />Ethyl tert-butyl ether <br />Tert-amyl methyl ether <br />Surrogate 12-Dichloroethane-d4 <br />Spike Sample QC Reporting Limit Recov RPD RPD <br />Level Result Result Units Recov Limits % Limit % <br />Date Prepared 7112100 <br />0070050-BLKI <br />7112100 ND <br />It ND <br />It ND <br />ND <br />„ ND <br />' ND <br />" 500 <br />487 <br />Extraction Method EPA 5030E PIT <br />up/l 1000 <br />„ 100 <br />200 <br />200 <br />" <br />200 <br />200 <br />760-114 974 <br />Blank <br />0070050-BLK2 <br />Ethanol <br />7113/00 <br />ND <br />ug/l <br />1000 <br />Tert-butyl alcohol <br />I.ND <br />100 <br />Methyl tert-butyl ether <br />N <br />ND <br />200 <br />*isopropyl ether <br />ND <br />" <br />200 <br />th-yl tert-butyl ether <br />ND <br />200 <br />Tert-amyl methyl ether <br />ND <br />" <br />200 <br />Surrogate 12-Dichloroethane-d4 <br />500 <br />494 <br />760-114 <br />988 <br />LCS <br />0070050 -BSI <br />Methyl tert-butyl ether <br />7/12/00 <br />Soo <br />438 <br />ug/l <br />700-130 <br />876 <br />Surrogate 12-Dichloroethane-d4 <br />IF <br />500 <br />458 <br />'r <br />760-114 <br />916 <br />LCS <br />0070050-BS2 <br />Methyl tert-butyl ether <br />7113/00 <br />500 <br />454 <br />ug/l <br />700-130 <br />908 <br />Surrogate 1 2-Dichloroethane-d4 <br />50 0 <br />49 9 <br />760-114 <br />998 <br />Matrix Sink e <br />0070050 -MSI <br />L007044-04 <br />Methyl tert-butyl ether <br />7/13/00 <br />500 <br />ND <br />53 2 <br />ug/1 <br />600-140 <br />106 <br />Surrogate 11-Dichloroethane-14 <br />500 <br />52 6 <br />if760-114 <br />105 <br />Matrix Spike Dup <br />0070050-MSD1 <br />L007044-04 <br />Methyl tert-butyl ether <br />7113100 <br />500 <br />ND <br />49 l <br />ug/1 <br />600-140 <br />98 2 25 0 764 <br />Surrogate 12-Dichloroethane d4 <br />50 0 <br />501 <br />760-114 <br />100 <br />• <br />Sequoia Analytical -San Carlos *Refer to end of report for text of notes and definitions <br />Page 6 of 7 <br />