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819 Sinker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> ID (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> 4�� www sequotalabs coin <br /> SECOR International-Rancho Cordova Project ARCO 2093,Tracy,CA <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 P-1-1 Manager- Rusty Benkosky 09/28/01 16 24 <br /> Volatde Organic Compounds by EPA Method 8260E-Quality Control <br /> Sequoia Analytical -Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit No, <br /> Batch 1090238-EPA 5030EJP/Tl <br /> Blank(1090238-BLKI _ -- Prepared&Analyzed 09/24/01 <br /> Tert-butyl alcohol ND 200 ug/1 <br /> Methyl tert-butyl ether ND 20 " <br /> Di-isopropyl ether ND 2 0 " <br /> Ethyl tert-butyl ether ND 20 " <br /> Tert-amyl methyl ether ND 20 " <br /> Ethanol ND 3000 " <br /> Surrogate 1 2-DCA-d4 460 500 920 60-140 <br /> LCS(1090238-BSI) Pre ared&Analyzed 09/24/01 <br /> Methyl tert-butyl ether 540 20 ug/l 500 108 60-140 <br /> Surrogate 1 2-DCA-d4 490 500 980 60-140 <br /> atnx Spike(1090238-MSI) Source S109209-01 Prepared&Analyzed 09/24/01 <br /> thyl tert-butyl ether 524 20 ug/l 500 ND 105 60-140 <br /> Surrogate 12-DCA-d4 494 500 988 60-140 <br /> Matnx Spike Du 1090238-MSDl Source 5109209-01 Papared&Analyzed 09/24/01 <br /> Methyl tert-butyl ether 493 20 119/1 500 ND 986 60-140 6 10 25 <br /> Surrogate 12-DCA-d4 497 500 994 60-140 <br /> Batch 1090271-EPA 5030B JP/Tl <br /> Blank 1090271-BLKI) Prepared&Analyzed 09/26/01 <br /> Tert-butyl alcohol ND 200 ug11 <br /> Methyl tent-butyl ether ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> Tort-amyl methyl ether ND 20 " <br /> Ethanol ND 3000 " <br /> Surrogate 1 2-DCA-d4 467 500 9.34 60-140 <br /> quota Analytical-Sacramento The results in this report apply to the samples analyzed to accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 8 of 13 <br />