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819 Striker Avenue,Suite 8 <br /> D— Sequoia Sacramento,CA 95834 <br /> j (916)921-9600 <br /> irfo Analytical FAX(916)921-0100 <br /> www sequoialabs corn <br /> elta <br /> :Env:,r,, (Cameron Park) Prosect Arco 6100,Tracy,CA <br /> 330 550 ProjectNumber Arco 6100,Tracy,CA Reported <br /> CameProsect Maaagcr Jay Johnson 01/28/02 15 54 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Regult Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2010325-EPA 5030B [MeOH] <br /> Blank(2010325-BLK1) Prepared 01/25/02 Analyzed 01/26/02 <br /> Tert-butyl alcohol ND 1 0 mg/kg <br /> Methyl cert-butyl ether ND 0 10 " <br /> Di-isopropyl ether ND 010 " <br /> Ethyl tert-butyl ether ND 0 10 " <br /> Tert-amyl methyl ether ND 0 10 <br /> Ethanol ND 10 " <br /> Surrogate 12-DCA-d4 262 250 105 60-140 <br /> LCS(2010325-BSI) Prepared 01/25/02 Analyzed 01/26/02 <br /> Methyl tert-butyl ether 2 31 0 10 mg/kg 250 924 60-140 <br /> Surrogate 12-DCA-d4 <br /> 245 250 980 60-140 <br /> LCS Dia 2010325-BSD1 Prepared 01/25/02 Analyzed 01/26/02 <br /> thyl tert-butyl ether 2 32 0 10 mg/kg 2 50 92 8 60-140 0 432 25 <br /> rogate 12-DCA-d4 241 250 964 60-140 <br /> IDuota 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 6 of 7 <br />