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stnker Avenue,Suite 8 <br /> Sequoia 819Sacramento,CA 95834 <br /> (916)9219600 <br /> Analytical FAX(916)921-0100 <br /> www sNuoralabs corn <br /> SECOR International-Rancho Cordova Project ARCO 434,Lodi,CA <br /> 3017 Kilgore Road,Suite L00 Project Number 434,Lodi,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Denkosky 03/29/02 17 21 <br /> MTBE by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Sacramento <br /> Reporting Spice Source %REC RPD <br /> Y� Result Limit Units Level Result %REC Lunits RPD Linut Notes <br /> Batch 2030283-EPA 5030B[P/T] <br /> Blank 2030283-BLKI PLLTAred 03/22/02 Anal 03/23/02 <br /> Tert-butyl alcohol ND 50 ttg/1 <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 Anal 03/23/02 <br /> Methyl tett-butyl ether 21 2 050 ug/1 250 848 70-130 <br /> Surrogate 11-DCA-d4 19 7 250 788 60-140 <br /> Matrix S Ike(2030283-MSl) Source 5203281-09 Prepared 03/22/02 Analyzed 03/23/02 <br /> Methyl tert-butyl ether 21 3 0 50 ug/l 250 ND 847 60-140 <br /> Surrogate 1,1-DCA-d4 196 250 784 60-140 <br /> Matrix S rke Du 2030283-MSD1 Source S203281-09 Prepared 03/22/02 Anal 03/23/02 <br /> ethyl tert-butyl ether 209 050 ug/1 250 ND 831 60-140 1 90 25 <br /> Surrogate 1,1-DCA-d4 -195 250 780 60-140 <br /> frquwa Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Thus analytical report must he reproduced in its entirety <br /> Page Page 8 of 10 <br />