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Sequoia 1455 McDowell Blvd. North,Ste. D <br /> Petaluma,CA 94954 <br /> 1„W Analytical FAX(707) 792-1865 <br /> (707) 792-0342 <br /> Cambria Environmental Project: Shell Oil Co. Sampled: 9/29/99 <br /> 270 Perkins St. Project Number: 440 Charter,Stockton Received: 9/29/99 <br /> Sonoma,CA 95476 Project Manager: Tom Magney Reported: 10/11/99 <br /> Volatile Organic Compounds by EPA Method 8260B/Quality Control <br /> Sequoia Analytical-Petaluma <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analvzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> Batch: 9090767 Date Prepared: 9/30/99 Extraction Method: EPA 5035 <br /> Blank 9090767-B L K I <br /> Tert-amyl methyl ether 9/30/99 ND ug/kg 5.00 <br /> Tert-butyl alcohol ND 100 <br /> Di-isopropyl ether ND 5.00 <br /> 1,2-Dibromoethane(EDB) ND 5.00 <br /> 1,2-Dichloroethane ND 5.00 <br /> Ethanol ND 200 <br /> Ethyl tert-butyl ether ND 5.00 <br /> Methyl tert-but I ether- ND 5.00 <br /> Surrogate: Dibromofluorontethane 50.0 47.8 80.0-120 95.6 <br /> Surrogate: 1,2-Dichloroethane-d4 50.0 48.3 80.0-120 96.6 <br /> Surrogate: Toluene-d8 50.0 46.5 81.0-117 93.0 <br /> Surrogate: 4-Brotnofluorobenzene 50.0 43.1 74.0-121 86.2 <br /> LCS 9090767-BSI <br /> Methyl tert-butyl ether 9/30/99 50.0 - 49.4 ug/kg _^_75.8-124 98.8_ <br /> Surrogate: Dibrontofluoromethane 50.0 48.7 80.0-120 97.4 <br /> Surrogate: 1,2-Dichloroethane-d4 50.0 50.1 80.0-120 100 <br /> Surrogate: Toluene-d8 50.0 47.5 81.0-117 95.0 <br /> Surrogate: 4-Bromofluoroben_ene 50.0 415 74 0-121 83 0 <br /> Matrix Spike 9090767-MSl P909669-04 <br /> Methyl tert-butyl ether 9/30/99 50.0 ND 47.0_ ug/kg _ _ 75.8-124 _9_4.0_ <br /> Surrogate: Dibromofluoromethane 50.0 48.5 80.0-120 97.0 <br /> Surrogate: 1,2-Dichloroethane-d4 50.0 49.7 80.0-120 99.4 <br /> Surrogate: Toluene-d8 50.0 46.8 81.0-117 93.6 <br /> Surrogate: 4-Bromofluorobenzene 50.0 43.9 74.0-121 87.8 <br /> Matrix Spike Dup 9090767-MSDI P909669-04 <br /> Methyl tert-butyl ether 9/30/99 50.0 ND 49.0_ug/kg__ _ 75.8_124 98.0 35.0 4.17 <br /> Surrogate: Dibromofluoromethane 50.0 48.4 80.0-120 96.8 <br /> Surrogate: 1,2-Dichloroethane-d4 50.0 48.7 80.0-120 97.4 <br /> Surrogate: Toluene-d8 50.0 46.7 81.0-117 93.4 <br /> Surrogate: 4-Brotnofktorobenzene 50.0 42.4 74.0-121 84.8 <br /> Sequoia Analytical-Petaluma *Refer to end of report for text of notes and definitions. <br /> Page 10 of I I <br />