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Sequoia 819 Sinker Avenue Suite 8 <br /> Sacramento ento CA 95834 <br /> 4 - (916)921-9600 <br /> fAX(916)921-0100 <br /> Analytical www seguoialabs corn <br /> SECOR International-Rancho Cordova Project ARCO 2093,Tracy,CA <br /> 3017 Kilgore Road,Suite 100 Project Number NIA Rcported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 04/11/01 18 40 <br /> Volatile Oxygenate Compounds by EPA Method 8260A - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reponing Spike Source %REC RPD <br /> Analyte Resull Limit Units Level Result %REC Lsmits RPD Limit Notes <br /> Batch 1040053- EPA 5030B IP/TI <br /> Blank(1040053-BLK1) _ _�T Prepared&Analyzed 04/04/01 <br /> Tert-butyl alcohol ND 200 ug/1 <br /> Methyl tert-butyl ether ND 200 <br /> Di-isopropyl ether ND 200 " <br /> Ethyl tert-butyl ether ND 200 " <br /> Tert-amyl methyl ether ND 200 <br /> Ethanol ND 3000 " <br /> Surrogate 12-DCA-d4 515 -500 103 60-140 — -— <br /> LCS(1040053-BSI) _ Prepared&Analyzed 04/04/01 <br /> Methyl tent-butyl ether 53 8 200 ug/I 500 108 60-140 <br /> Senate 1 2-DCA-d4 55.3 500 111 60-140 <br /> 11 lFtx Spike(1040053-MS1) Source 5103494-04 Prepared&Analyzed 04/04/01 <br /> Methyl tort-butyl ether 542 200 ugll 500 ND 107 60-140 <br /> Surrogate 1,2-DCA-d4 544 " 500 109 60-140 <br /> Matrix Spike Dup(1040053-MSD1) Source S10349_4-04 Prepared&Analyzed 04/04/01 <br /> Methyl Leri-butyl ether _ 543 200 UO 500 ND 107 60-140 0 184 25 <br /> Surragale 12-DCA-d4 531 500 106 60-140 <br /> Batch 1040065- EPA 5030EJP/TJ <br /> Blank(1040065-BLKI) Prepared&Analyzed 04/05/01 <br /> Tert-butyl alcohol ND 200 ug/l <br /> Methyl tert-butyl ether ND 200 " <br /> Di-tsopropyl ether ND 200 " <br /> Ethyl tert-butyl ether ND 200 " <br /> Tert-arnyl methyl ether ND 200 " <br /> Ethanol ND 3000 " <br /> Surrogate 1 2-DCA-d4 559 500 112 60-140 <br /> ota 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 /> Page 10 of 12 <br />