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y ,n <br /> 819 Stnker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921.4100 <br /> www sequoialabs com <br /> SECOR International-Rancho Cordova Project ARCO 2093,Tracy,CA <br /> 3017 Kilgore Road,Sulte 100 Project Number 2093,Tracy,CA Reported <br /> Rancho Cordova CA,95670 Pmjw Manager Rusty Benkosky 04/01/02 18 44 <br /> MTBE by EPA Method 8260B-Quahty Control <br /> Sequoia Analytical-Sacramento <br /> Reporting Spice Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Lrmyt Not- <br /> Batch 2030242-EPA 5030B[PIT] <br /> Blank(2030242-BLKI) Prepared&Analyzed 03/20/02 <br /> Tort-butyl alcohol ND 50 119/1 <br /> Methyl tert-butyl ether ND 050 " <br /> Surrogate 12-DCA-d4 221 250 884 60-140 <br /> LCS(2030242-BSI) Prepared&Analyzed 03/20/02 <br /> Methyl tert-butyl ether 235 050 u9/1 250 940 70-130 <br /> Surrogate 1,2-DCA-d4 214 11250 856 60-140 <br /> Matrix Spike(2030242-MSI) Source S203288-01 Prepared&Analyzed 03/20/02 <br /> Methyl tert-butyl ether 18 3 050 ug/l 250 19 656 60-140 <br /> Surrogate 1,2-DCA-d4 173 250 692 60-140 <br /> Matrix Spike Dup(2030242-MSD1) Source 5203288-01 Prepared&Analyzed 03/20/02 QR-02 <br /> Methyl tert-butyl ether 273 0 50 u9n 25 0 1 9 102 60-140 39 5 25 <br /> Surrogate 12-DCA-d4 212 250 848 60-140 <br /> Batch 2030283-EPA 5030B [P/Tj <br /> Blank(2030283-BLK1) _ Prepared 03/22/02 Analyzed 03123/02 <br /> Tert-butyl alcohol ND 50 ug/l - <br /> Methyl tert-butyl ether ND 050 " <br /> Surrogate 1 2-DCA-d4 192 250 768 60-140 <br /> LCS(2030283-BS1) Prepared 03/22/02 Analyzed 03/23/02 <br /> Methyl tert-butyl ether 21 2 0 50 ug/I 250 848 70-130 <br /> Surrogate 1,2-DCA-d4 197 It 250 788 60-140 <br /> Sequoia Analytical-Sacramento 77te results to this report apply to the samples analyzed to accordance with the chain . <br /> of custody document Thu analytical report must be reproduced in Its entirety <br /> Page Page 9 of 11 <br />