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819 Stnker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)92I-9600 <br /> Analytical FAX(916)921.0100 <br /> Ah�& www sequoialabs com <br /> SECOR International-Rancho Cordova Project ARCO 434,Lodi,CA <br /> 3017 Kilgore Road,Suite 100 Project Number 434,Lodi,CA Reported <br /> Rancho Cordova CA,95670 Project M-ager Rusty Benkosky 03/29/02 17 21 <br /> MTBE by EPA Method 8260B <br /> Sequoia Analytical-Sacramento <br /> Reporting <br /> Analyte Result Umd Units Dilution Batch Prepared Analyzed Method Notes <br /> W-lA(S20320jQI)Hater Sampled,03/11/011.0.45 Received.03/15/0212.45 <br /> Methyl tert-butyl ether ND 050 ug/l 1 2030283 03/22/02 03/23/02 EPA 8260B <br /> Surrogate 12-DCA-d4 788% 60-140 " <br /> W-2(S203268-02)Water Sampled,03/11/02 11.40 Received,03/15/02 12.45 <br /> Methyl tert-butyl ether 094 050 ug/1 1 2030283 03/22/02 03/23/02 EPA 8260B <br /> Surrogate 12-DCA-d4 800% 60-140 " <br /> W--2A(5203268-03)Water Sampled 03/11/0216.00 Received.03/15/02]2.45 <br /> Methyl tert-butyl ether ND 050 ug/l 1 2030283 03/22/02 03/23/02 EPA 8260E <br /> Surrogate 12-DCA-d4 776% 60-140 <br /> W-2B(S203268-04)Water Sampled 03/11/02 15 00 Received 03/15/02 12 45 <br /> Methyl tert-butyl ether 071 050 ug/1 1 2030283 03/22/02 03/23/02 EPA 8260B <br /> Surrogate 12-DCA-d4 776% 60-140 <br /> -3 5203268-0 Water -Sampled 03/11/02 13 05 Received 03/15/0212 45 <br /> __ethyl tent-butyl ether ND 050 ug/l 1 2030283 03/22/02 03/23/02 EPA 8260B <br /> Surrogate 1,2 DCA-d4 792% 60-140 <br /> W-9(S203268-06)Water Sampled 03/11/021359 Received 03/15/02 12 45 <br /> Methyl tert-butyl ether ND 050 ug/1 1 2030283 03/22/02 03/23/02 EPA 8260B <br /> Surrogate 12-DCA-d4 79 6% 60-140 " <br /> uota Analytical-Sacramento The results in this report apply to the samples analyzed ui accordance with the chain <br /> of custody document This analytical report must be reproduced to its entirety <br /> Page Page 4 of 10 <br />