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819 Sinker Avenue Suite 8 <br /> 5834 <br /> Sequoia Sacramento,)9 9 <br /> (916)421-95009600 <br /> Analytical FAX 921-0100 <br /> www sequoiequoialabs cam <br /> SECOR International-Rancho Cordova Project ARCO 434, Lodi,CA <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project M—g- Rusty Benkcisky 10/01/01 14 56 <br /> MTBE by EPA Method 8260B-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 1090238-EPA 5030E PIT <br /> Blank 1090238-BLKI Prepared&Analyzed 09/24/01 <br /> Methyl tert-butyl ether ND 20 ugll <br /> Surrogate 1 2-DCA-d4 460 500 920 60-140 <br /> LCS 1090238-BSI Prepared&Analyzed 09/24/01 <br /> Methyl tert-butyl ether 540 20 11911 Soo 108 70-130 <br /> Surrogate 12-DCA-d4 490 " 500 980 60-140 <br /> Matrix Spike(1090238-MSI) Source 5109209-01 Prepared&Analyzed 09/24/01 <br /> Methyl tert-butyl ether 524 20 ug/1 500 ND 105 60-140 <br /> Surrogate 12-DCA-d4 494 500 988 60-140 <br /> Matrix Spike Dup(1090238-MSD1) Source 5109209-01 Prepared&Analyzed 09/24/01 <br /> Methyl tert-butyl ether 493 2 0 119/1 50 0 ND 98 6 60-140 6 10 25 <br /> 140111arrogate 1 2-DCA-d4 49 7 500 994 60-140 <br /> Batch 1090271-EPA 5030B[PIT] <br /> Blank(1090271-BLKI) Prepared&Analyzed 09/26/01 <br /> Methyl tert-butyl ether ND 20 119/1 <br /> Surrogate 12-DCA-d4 467 500 934 60-140 <br /> LCS(1090271-BSI) Prepared&Analyzed 09/26/01 <br /> Methyl tert-butyl ether 530 2 0 ug/I 500 106 70-130 <br /> Surrogate 12-DCA-d4 494 Soo 988 60-140 <br /> Matrix Spike(1090271-MSI) Source 5109258-04 Prepared&Analyzed 09/26/01 <br /> Methyl tert-butyl ether 503 20 11911 500 ND 101 60-140 <br /> Surrogate 12-DCA-d4 490 500 980 60-140 <br /> quota Analytical-Sacramento The results in this report apply to the samples analyzed rn accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 6 of 12 <br />