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a <br /> 819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> MW Analytical FAX(916)92I-0100 <br /> www sequoialabs com <br /> SECOR International-Rancho Cordova Project ARCO 2093,Tracy,CA <br /> 3017 Kilgore Road,Suite 100 P-1-t Number 2093,Tracy,CA Reportad <br /> Rancho Cordova CA,95670 Pmlect Ma-g- Rusty Benkosky 04/01/02 18 44 <br /> MTBE by EPA Method 8260B <br /> Sequoia Analytical-Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> &M-2(S20328"1))yater Saw2led. 2 13.55 -Received,M18W 15.QQ <br /> Telt-butyl alcohol ND 50 ug/1 1 2030242 03/20/02 03/20/02 EPA 9260B <br /> Surrogate 1 2-DCA-d4 840% 60-140 <br /> 02 - Water ed 355 Received 03/18102 15.00 <br /> Methyl tert-butyl ether 98 25 ug/1 5 2030283 03/22/02 03/23/02 EPA 8260B <br /> Surrogate 12-DC4-d4 768% 60-140AIR <br /> - (SM281-02) a am e e R-05 <br /> Tert-butyl alcohol ND 50 uO 10 2030242 03/20/02 03/20/02 EPA 8260B <br /> Methyl tert-butyl ether ND 50 <br /> Surrogate 1,2-DCA-d4 840% 60-140 <br /> ATR4 5203281-03 Water Sampled 03/14/02 12 35 Received 03/18/02 15 00 A-01 <br /> Tert-butyl alcohol ND 50 ug/I 10 2030242 03/20/02 03/20/02 EPA 8260B <br /> Surrogate 1,2-DCA-d4 828% 60-140 <br /> 203281-03RE1 Water Sampled 03/141021235 Received 03/18/02 15 00 <br /> Methyl tert-butyl ether 710 l0 ug/1 20 2030283 03/22/02 03/23/02 EPA 8260B <br /> Surrogate 12-DCA-d4 768% 60-140 <br /> A,TR-6 2 4 ater am M4102 13JQ _Reenved 03118/02 15,00 <br /> Tert-butyl alcohol ND 50 ugll 1 2030242 03/20/02 03/20/02 EPA 8260B <br /> Methyl tert-butyl ether 18 050 <br /> Surrogate 12 DCA-d4 872% 60-140 „ <br /> Sequoia Analytical-Sacramento The results In this report apply to the samples analyzed In accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 5 of i 1 <br />