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Sequoia 819 Striker Avenue,Suite 8 <br /> I!DSacramento,CA 95834 <br /> Analytical (916)921-9600 <br /> FAX(916)921-0100 <br /> www.sequoialabs.com <br /> Delta Environmental Consultants(Cameron Park) Project: Arco 6100,Tracy,CA <br /> 3330 Cameron Park Dr.Ste 550 Project Number: N/A <br /> Cameron Park CA 95682 Reported: <br /> > Project Manager. )ay Johnson 09/21/01 15:50 <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 1090152-EPA 5030E McOH <br /> Blank(1090152-BLKl) Pre aced:09/17/O1 Anal zed:09/18/01 <br /> Tert-butyl alcohol ND 10 mg/kg <br /> Methyl tert-butyl ether ND 0.10 <br /> Di-isopropyl ether ND 0A0 „ <br /> Ethyl tert-butyl ether ND 0.10 " <br /> Tert-amyl methyl ether ND 0.10 " <br /> Ethanol ND 150 " <br /> 1,2-Dichloroethane ND 010 „ <br /> Ethylene dibromide ND 0.10 " <br /> Surrogate: 1,1-DC.4-d4 2.44 2,50 97.6 60-140 <br /> LCS 1090152-BS1 Prepared:09/17/01 Analyzed:09/18/01 <br /> Methyl cert-butyl ether 2.39 0.10 mg/kg 2.50 95.6 60.140 <br /> Surrogate:1,2-DC.4-d4 2.40 11 2.50 96.0 60-140 <br /> ,wlatrix Spike. 1090152-MSI Source:5109141-09 Pre aced:09/17/01 Analyzed:09/18/01 <br /> Methyl tert-butyl ether 2.26 0.10 mg/kg 2.50 ND 90.4 60-140 <br /> Surrogate; 1,2-DCA-d4 2.17 11 2.50 86.8 60-140 <br /> Matrix Spike Du 1090151-MSD1) Source:SI09141-09 Prepared:09/17/01 Analyzed:09/18/01 <br /> Methyl tert-butyl ether 2.20 0.10 mg/kg 2.50 ND 88.0 60-140 2.69 25 <br /> Surrogate: 1,2-DCA-d4 1.13 2.50 85.2 60-140 <br /> Batch 1090180-EPA 5030B(PIT <br /> Blank 1090180-BLKI Prepared&An zed:09/19/01 <br /> Tert-butyl alcohol ND 10 mg/kg <br /> Methyl tert-butyl ether ND 0.10 " <br /> Di-isopropyl ether ND 0.10 " <br /> Ethyl tert-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 1.17 2,50 85.8 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. This analytical report must be reproduced in its entirety. <br /> Page Page 15 of 24 <br />