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Sequoia 819 Striker Avenue,Suite 8 <br /> 4 Sacramento, CA 95834 <br /> (916) 921-9600 <br /> qw,!D- Analytical FAX(916) 921-0 100 <br /> Cambria Environmental Project: Equilon 440 W Charter Way,Stockton Sampled: 6/25/99 <br /> 270 Perkins Street Project Number: 88870583 Received: 6/25/99 <br /> Sonoma,CA 95476 Project Manager: Wayne Chiu Reported: 6/29,7/8-9/99 <br /> Volatile Oxygenate Compounds by EPA Method 8260A/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analvzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> Batch: 9070009 Date Prepared: 7/1/99 Extraction Method: EPA 50308 [MeOH] <br /> Blank 9070009-BLKI <br /> Tert-butyl alcohol 7/2,99 ND mg/kg 10.0 <br /> Methvl tert-butyl ether ND 0.100 <br /> Di-isopropyl ether ND 0.100 <br /> Ethyl tert-butyl ether ND 0.100 <br /> Tert-amyl methyl ether ND 0.100 <br /> Surrogate: 1,2-DC.4-d4 2.50 2.66 60.0-140 106 <br /> LCIS 9070009-BSI <br /> Methyl tert-butyl ether 7/2/99 2.50 2.40 mg/kg 70.0-130 96.0 <br /> Surrogate: 1,--'-DC.4-d4 " 2.50 2.87 60.0-140 115 <br /> Matrix Spike 9070009-MSI S906417-01 <br /> Methyl tert-butyl ether 7/1/99 2.50 ND 2.32 mg/kg 60.0-140 92.8 <br /> Surrogate: 1,2-DCA-d4 112.50 2.66 60.0-140 106 <br /> Matrix Spike Dun 9070009-NISD1 S906417-01 <br /> Methyl tert-butyl ether 7/1/99 2.50 ND 2.40 rnaI-g 60.0-140 96.0 25.0 3.39 <br /> Surrogate: 1,2-DCA-d4 112.50 2.72 1160.0-140 109 <br /> Batch: 9070010 Date Prepared: 7/1/99 Extraction Method: EPA 50306 IMeOHI <br /> Blank 9070010-BLKI <br /> Tert-butyl alcohol 7/1/99 ND mg/kg 10.0 <br /> Methyl tert-butyl ether ND 0.100 <br /> Di-isopropyl ether ND 0.100 <br /> Ethyl tert-butyl ether ND 0.100 <br /> Tert-amyl methyl ether ND 0.100 <br /> Surrogate: 1.?-DCA-d4 2.50 2.62 60.0-140 105 <br /> Qcs 9070010-BS1 <br /> Methyl tert-butyl ether 7/1/99 2.50 2.13 mg/kg 70.0-130 85.2 <br /> Surrogate: l,2-DCA-d4 " 2.50 2.58 60.0-140 103 <br /> Matrix Spike 9070010-MSI 5906417-15 <br /> Methyl tert-butyl ether 7/1/99 2.50 ND 2.15 mg/kg 60.0-140 86.0 <br /> Surrogate: 1,2-DCA-d4 112.50 2.41 60.0-140 96.4 <br /> Matrix Spike Du_n 9070010-MSD1 S906417-15 <br /> Methyl tert-butyl ether 7/1/99 2.50 ND 1.93 mg/kg 60.0-140 77.2 25.0 10.8 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 16 of 18 <br />