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¢ 819 Striker Avenue,Suite 8 8 <br /> Sequoia Sacramento,CA 95834 4 <br /> (916)921-9600 0 <br /> Analytical <br /> FAX(916) sp <br /> wwwsequoialaalabs.com.com n <br /> Stratus Environmental Project: ARCO 5469,Stockton,CA <br /> 3330 Cameron Park Drive,Ste.550 Project Number: 5469,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 10/14/02 16:55 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2100002-EPA 5030B (P/T] <br /> Blank(2100002-BLK1) Prepared&Analyzed: 10/01/02 <br /> Tert-butyl alcohol ND 5.0 ug/1 <br /> Methyl tert-butyl ether ND 0.50 " <br /> Di-isopropyl ether ND 0.50 " <br /> Ethyl tert-butyl ether ND 0.50 " <br /> Tert-amyl methyl ether ND 0.50 " <br /> Ethanol ND 50 " <br /> 1,2-Dichloroetharte ND 0.50 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> Surrogate:1,2-DC.444 17.7 25.0 111 60-140 <br /> LCS(2100002-BS1)_ Prepared&Analyzed: 10/01/02 - <br /> Ithyl tert-butyl ether 26.8 0.50 ugl] 25.0 107 60-140 - <br /> ,drrogate:l,2-DCA-d4 18.2 " 25.0 113 60-140 <br /> Matrix Spike(2100002-MSI) Source: S209427-01 Prepared&Analyzed: 10/01/02 <br /> Methyl tert-butyl ether 33.7 0.50 ug/1 25.0 7.2 106 60-140 <br /> Surrogate: 1,2-DCA-d4 17.6 1125.0 110 60-140 <br /> Matrix Spike Dup(2100002-MSD1) -_ Source: 5209427-01 Prepared&Analyzed: 10/01/02 - <br /> Methyl tert-butyl ether 32.6 0.50 ugll 25.0 7.2 102 60-140 3 25 <br /> Surrogate:1,2-DCA-d4 -��-_------27.3 " 25.0 109 64-140 --- --- --- _- <br /> Batch 2100049-EPA 5030B [P/T] <br /> Blank(2100049-BLKI) Prepared&Analyzed: 10/03/02 - <br /> Tert-butyl alcohol ND 5.0 ug/] <br /> Methyl tert-butyl ether ND 0.50 " <br /> Di-isopropyl ether ND 0.50 " <br /> Ethyl tert-butyl ether ND 0.50 " <br /> Tert-amyl methyl ether ND 0.50 <br /> Ethanol ND 50 <br /> 1,2-Dichloroethane ND 0.50 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 <br /> Surrogate: - <br /> 1,2-DCA-d4 21.9 25.0 88 6D 140 <br /> quoia Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. This analytical report must be reproduced in its entirely. <br /> Page 11 of 13 <br />