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Sequoia 885 Jarvis Dr <br /> Morgan Hill,CA 95037 <br /> Analytical (408)776-9600 <br /> FAX(408)782-6308 <br /> www.s!quoialabs.com <br /> tratus Environmental Inc. Project: ARCO#5469,Stockton,CA MLK0749 <br /> 3U Cameron Park Dr.,Suite 550 Project Number: ARCO 95469, Stockton, CA Reported: <br /> Cameron Park CA, 95682 Project Manager: Jay Johnson 12/19/02 08:44 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %R.EC Limits RPD Limit Notes <br /> Batch 2K30001 -EPA 5035 <br /> Blank(2K30001-BLKI.) Prepared&Analyzed: 11/30/02 <br /> Ethanol ND 40 ug/kg <br /> tort-Butyl alcohol ND 20 <br /> 0-09 <br /> Methyl tert-butyl ether ND 0.50 " <br /> Di-isopropyl ether ND 0.50 " <br /> Ethyl tent-butyl ether ND 0.50 0-09 <br /> tert-Amy]methyl ether ND 0.50 0-09 <br /> I,2-Dichloroethane ND 0.50 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> Surrogate: 1,2-Dichloroethane-d4 4.88 5.00 97,6 60-140 <br /> Laboratory Control Sample(2K30001-BSI) Prepared&Analyzed: 11/30/02 <br /> M-r,thyl tert-butyl ether 12.7 0.50 ug/kg 10.0 127 60-140 <br /> Sun ogate: 1.2-Dichloroethane-d4 4.78 5.00 95.6 60-140 <br /> Matrix Spike(2K30001-MSI) Source: MLK0732-09 Prepared&Analyzed: 11/30/02 <br /> Methyl tert-butyl ether 1100 2.4 uglkg 49.0 2100 NR 60-140 E,QM-4X <br /> Surrogate;1,2-Dichloroethane-d4 4.18 5.00 83.6 60-140 <br /> Alatrix Spike Du (2K30001-1%ISD1) _ Source:MLK0732-09 Prepared&Analyzed: I1/30/02 <br /> Methyl tert-butyl ether 741 2.5 -ug/kg 49.5- 2100 NR 60-140 39.0 25 E,QM-4X,Q <br /> R-4X <br /> Surrogate:l,2-Dichloroethane-d4 4.11 5.00 82.2 60-140 <br /> Sgia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chairs of <br /> custody document. Unless otherwise stated,results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety. <br /> Page 8 of 9 <br />