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Sequoia 819 Striker Avenue,Suite <br /> Sacramento,CA 958344 <br /> (916)921-9600 <br /> Analytical wFAX(916) ll-0100 <br /> wwsequoialabs.com <br /> Delta Environmental Consultants(Cameron Park) Project: Arco 6100,Tracy,CA <br /> 3330 Cameron Park Dr. Ste 550 Project Number: N/A Reported: <br /> Cameron Park CA; 95682 Project Manager: Jay Johnson 09/17/01 14:42 <br /> Volatile Oxygenate Compounds by EPA Method 8260A - 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 1090138-EPA 5030B [MeOHI <br /> Blank(1090138-BLKI) Prepared: 09/14/01 Analyzed:09/15/01 <br /> Tert-butyl alcohol ND 10 mg/kg <br /> Methyl tent-butyl ether ND 0.10 " <br /> Di-isopropyl ether ND 0.10 " <br /> Ethyl teri-butyl ether ND 0.10 " <br /> Tert-amyl methyl ether ND 0.10 <br /> Ethanol ND 150 <br /> 1,2-Dichloroethane ND 0.10 " <br /> Ethylene dibromide ND 0.10 " <br /> Surrogate: 1,2-DCA-d4 2.58 2.56 103 60-140 <br /> LCS(1090138-SSI) Prepared:09/14/01 Analyzed:09/15/01 <br /> hyl tent-butyl ether 2.57 0,10 mg/kg 2.50 103 60-140 <br /> urrogule: l,2-DCA-d4 2.76 12.50 110 60-140 <br /> Matrix Spike(1090138-MSI) Source: 5109122-01 Prepared:09/14/01 Analyzed:09/15/01 <br /> Methyl tent-butyl ether 2-34 0.10 mg/kg 2.50 ND 93.6 60-140 <br /> Surrogate: 1,2-DCA-d4 2.32 2.50 92.8 60-140 <br /> Matrix Spike Dup(1090138-MSDI) Source: 5109122-01 Prepared:09/14/01 Analyzed: 09/15/01 <br /> Methyl tent-butyl ether 2.46 0.10 mg/kg 2.50 ND 98.4 60-140 5.00 25 <br /> Surrogate: 1,2-DCA-d4 2.45 2.50 98.0 60-140 <br /> N,..,.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 entirety. <br /> Paae 6 of 7 <br />