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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento CA 95834 <br /> (916)921-9600 <br /> FAX(916)921-0 100 <br /> Analytical www sequoialabs com <br /> WO <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 03/30/01 11 35 <br /> MTBE by EPA Method 8260A - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reportint, Spike Source %RLC RPD <br /> Anat5tc, Result Limit Units Level Result %RFC Limits RPD Limit Notes <br /> Batch 1030398- EPA 5030B [P/TJ <br /> Blank 1030398-BLK1 Prepared&Analyzed 03/29/01 <br /> Methyl tert-butyl ether T ND 200 ugll - <br /> -arrogate I2-DCA-d4 -- -409 - - 500 818 60-140 <br /> LCS(10_30_39_8-BSI) _ -- - Prepared&Analyzed 03/29/01 <br /> Methyl ten-butyl ether 480 200 ug/l 500 96 0 70-130 <br /> Surrogate 1 2-DCA-d4- ---� -- 430 - — 500 860 60-140 <br /> Matrix Spike(1030398-MSI) Source 5103323-07 Prepared&Analyzed 03/29/01 --- - �- - <br /> Methyl Cert-butyl ether-� 482 200 ug/l 500 ND 964 60-140 -� -- <br /> Surrogate 1 2-DCA-d4 428 500 856 60-140 <br /> ldlLx Dup(1030398-MSD1) -_ Source S103323-07 Prepared&Analyzed 03/29/01 <br /> 1 tert-butyl ether 498 200 ugAi 500 ND 996 <br /> 60-140 3 27 25 <br /> Surrogate 11-DCA-d4 440 500 880 60-140 <br /> oia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Thts analytical report must be reproduced in its entirety <br /> Page 10 of 12 <br />