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Sequoia <br />Analytical <br />• <br />SECOR International - Rancho Cordova <br />3017 Kilgore Road, Suite 100 <br />Rancho Cordova, CA 95670 <br />Project Chevron 9-5775, Lodi, CA <br />Project Number 077 41991 043 <br />3miert Manaoer Roeer Hoffmore <br />819 Striker Avenue Suite 8 <br />Sacramento CA 95834 <br />(916) 921-9600 <br />FAX (916) 921-0100 <br />www sequoialabs com <br />Sampled 7/12/00 <br />Received 7112100 <br />Reoorted 7/13-14,17100 <br />Volatile Organic Compounds by EPA Method 8260A/Quality Control <br />Sequoia Analytical - Walnut Creels <br />Date <br />Level <br />Batch OG13020 Date Pretwed 7/13100 <br />Blank OG13020-BLKI <br />Ethanol 7113/00 <br />tent -Butyl alcohol <br />Methyl tert-butyl ether <br />Di -isopropyl ether " <br />Ethyl tent -butyl ether <br />tert-Amyl methyl ether " <br />1,2-D[chloroethane " <br />Ethylene dibromide " <br />Surrogate Dibromofluoromethane 500 <br />Surrogate 1,2-Dichloroethane-d4 500 <br />Sample QC Reporting Limit Recov RPD RI'D <br />Result Result Units Recov Limits % Limit % Notes* <br />Extraction Method EPA 5030E[P/TJ <br />ND ug/l <br />500 <br />ND <br />100 <br />ND <br />20 <br />ND <br />20 <br />ND <br />20 <br />ND <br />20 <br />ND <br />20 <br />ND <br />20 <br />470 <br />50-150 940 <br />420 <br />50-150 840 <br />Blank <br />OG13020-BLK2 <br />anol <br />7/14/00 <br />ND <br />ug/l <br />500 <br />go -Butyl alcohol <br />ND <br />110 <br />Methyl tert-butyl ether <br />ND <br />2 2 0 <br />Di -isopropyl ether <br />ND <br />" <br />2 0 <br />Ethyl tert-butyl ether <br />ND <br />2 0 <br />tert-Amyl methyl ether <br />ND <br />20 <br />1,2-Dichloroethane <br />ND <br />" <br />20 <br />Ethylene dibromide <br />ND <br />" <br />20 <br />----- <br />Surrogate Dibromofluoromethane <br />500 <br />500 <br />to50-150 <br />100 <br />Surrogate 12-Dichloroethane-d4 <br />500 <br />340 <br />50-150 <br />680 <br />LCS <br />OG13020-BSI <br />Methyl tert-butyl ether <br />7/13/00 <br />500 <br />496 <br />ug/l <br />70-130 <br />992 <br />Surrogate Dibromofluoromethane <br />500 <br />460 <br />to50-150 <br />920 <br />Surrogate 1,2-Dichloroethane-d4 <br />500 <br />380 <br />or50-150 <br />760 <br />LCS <br />OG13020-BS2 <br />Methyl tent -butyl ether <br />7/14/00 <br />500 <br />439 <br />ug/l <br />70-130 _ <br />87 8 — <br />Surrogate Dibromofluoromethane <br />500 <br />490 <br />50-150 <br />980 <br />Surrogate 12-Dichloroethane-d4 <br />500 <br />320 <br />50-150 <br />640 <br />Matrix Spike <br />OG13020-MS1 <br />S007095-01 <br />Methyl tert-butyl ether <br />7113/00 <br />Soo <br />ND <br />452 <br />ug/l <br />60-150 <br />904 <br />_ <br />Surrogate Dibromofluoromethane <br />500 <br />510 <br />1150-150 <br />102 <br />Surrogate 12-Dichloroethane-d4 <br />500 <br />450 <br />or50-150 <br />900 <br />Matrix Spike Dun <br />OG13020-MSDI <br />S007095-01 <br />thyl tert-butyl ether <br />7/13/00 <br />500 <br />ND <br />51 7 <br />ug/l <br />60-150 <br />103 25 134 <br />equoia Analytical - Sacramento <br />*Refer to end ofreport for text of notes and definitions <br />Page 10 of 13 <br />