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819 SU*cr Avenue,Suite 8 <br /> Sequoia 34 <br /> (9t16 9 L998600 <br /> Analytical FAX(916)921-0100 <br /> www sequoialabs com <br /> SECOR International-Rancho Cordova Project Tosco 1205,Lathrop,CA <br /> 3017 Kilgore Road,Suite 100 Protect Number N/A [reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 04/10/02 18 08 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporimg SpLke Source %REC RPD <br /> Analyte Result Lmut units Levet Result %REC Lmts RPD Lnmt Note- <br /> Batch 2030357-EPA 5030B [PIT] <br /> Blank(2030357-BLK1) _ Prepared 03/27/02 Analyzed 03/28/02 <br /> Tert-butyl alcohol _ ND 50 mghn'Air _ <br /> Methyl tert-butyl ether ND 050 " <br /> Dr-isopropyl ether ND 050 <br /> Ethyl tart-butyl ether ND 050 " <br /> Tert-amyl methyl either ND 050 " <br /> Ethanol ND 3000 " <br /> 1,2-Dichloroetlime ND 050 " <br /> Ethylene dibr trade ND 050 " <br /> Surrogate 12-DCA-d4 116 100 116 60-140 <br /> LCS(2030357-BS1) Prepared 03/27/02 Analyzed 03/28/02 <br /> Methyl cert-butyl ether 122 0 50 rng/m3 Air 100 122 70-130 <br /> Surrogate 12-DCA-d4 Il 8 100 118 60-140 . <br /> LCS Dup(2030357-BSD1) Prepared 03/27/02 Analyzed 03/28/02 <br /> Methyl tart-butyl ether 124 0 50 mg/&Air 100 124 70-130 1 63 25 <br /> Surrogate 12-DCA-d4 123 100 123 60-140 <br /> Sequoia Analytical-Sacramento The results to this report apply to the samples analyzed In accordance with the chain <br /> 11o <br /> lift document This analytical report must be reproduced in its entire"W <br /> Page Page 13 of 14 <br />