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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento CA 95834 <br /> (916)921 9600 <br /> Analytical www <br /> 921-0100 <br /> sequequoialabs com <br /> SECOR International -Rancho Cordova Project ARCO 434,Lodi, CA <br /> 3017 Kilgore Road,Suite 100 Project Number NIA Reported <br /> Rancho Cordova CA, 95670 Project Manager Rusty Benkosky 05/27/01 12 49 <br /> MTBE by EPA Method 8260A- 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 1050252 -EPA 5030B (P/TJ <br /> Blank(1050252-BLK1) - _ Prepared &Analyzed 05/21/01 _ <br /> Methyl tert-butyl ether ND 200 ug/1 <br /> Surrogate 12-DCA-d4 458 500 916 60-140 <br /> LCS(1050252-BS1) Prepared&Analyzed 05/21/01 <br /> Methyl tert-butyl ether 536 200 ug/i 500 107 70-130 <br /> Surrogate 12-DCA d4 479 500 958 60 140 <br /> Matrix Spike(1050252-MSI) Source S105213-01 Prepared&Analyzed 05/21/01 <br /> Methyl tert-butyl ether 505 200 ugA 500 ND 101 60-140 <br /> Surrogate 1 2-DCA-d4 477 500 954 60-140 <br /> NJ"x Spike Dup(1050252-MSD1) Source S105213-01 Prepared&Analyzed 05/21/01 <br /> "Wert-butyl ether 523 200 ug/l Soo ND 105 60-140 350 25 <br /> Surrogate 1 2-DCA-d4 490 500 980 60-140 <br /> Batch 1050269-EPA 5030B [P/TJ <br /> Blank(1050269-BLKI) Prepared&Analyzed 05/22/01 <br /> Methyl cert-butyl ether ND 200 ug/l <br /> Surrogate 1 2-DCA-d4 486 500 972 60-140 <br /> LCS(1050269-BS1) Prepared,&Analyzed 05/22/01 <br /> Methyl tent-butyl ether 470 200 ug/l 500 940 70-130 <br /> Surrogate 12-DCA-d4 493 11 500 986 40-140 <br /> Matrix Spike(1050269-MSI) Source S105238-01 Prepared&Analyzed 05/22/01 <br /> Methyl tert-butyl ether 439 200 ug(l 500 ND 878 60-140 <br /> Surrogate 12-DCA-d4 488 500 976 60-140 <br /> to 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 8 of 1 1 <br />