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• Sequoia 819 Striker Avenue,Suite 8 <br /> Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical <br /> FAX (916)921-0100 <br /> EMCON-CP Project: ARCO 2186,Stockton,CA Sampled: 6/17/99 <br /> 3939 Cambridge Ave Project Number: 21775-237-002 <br /> Received: 6/18/99 <br /> Cameron Park,CA 95682 <br /> Project Manager: Mark Capps Reported: 7/1/99 <br /> Volatile Oxygenate Compounds by EPA,r,Method 8260A/Quality Control <br /> Sequoia Analytical-'Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov.Limits % Limit % Notes* <br /> Batch: 9060309 Date Prepared- 6/21/99 Extraction Method: FPA 50308 [Me�1H1 <br /> Blank 9060309-B .K1 <br /> Tert-butyl alcohol 6/21/99 <br /> Methyl tent-butyl ether ND mg/kg 10.0 <br /> 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 /> Ethanol ND 150 <br /> . <br /> Surrogate: 1,2-DCA-d4 2.50 2.33 600-140 93.2 <br /> LCS 2060309-BSI <br /> Methyl tert-butyl ether 6/21/99 2.50 2.49 mg/kg 70.0-130 99.6 <br /> Surrogate: 1,2-DCA-d4 11 2.50 2.36 60.0-140 94.4 <br /> Matrix Spike 9060309-MSI S906319-01 <br /> Methyl tert-butyl ether 6/23/99 2.50 11.0 11.9 mg/kg <br /> Surrogate: 1,2-DCA-d4 60.0-140 36.0 4 <br /> 2.50 1.95 60.0-140 78.0 <br /> Matrix Spike Duo 9060309-M=Dl S906319-01 <br /> Methyl tert-butyl ether 6/23/99 2.50 11.0 12.2 mg/kg 60.0-140 48.0 25.0 28.6 4 <br /> Surrogate: 1,2-DCA-d4 2.50 2.06 60.0-140 82.4 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 13 of 14 <br />