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819 Striker Avenue,Suite 8 <br /> Se I101a Sacminento,CA 95834 <br /> q (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www sequoialabs coin <br /> SECOR International-Rancho Cordova Project ARCO 2093,Tracy,CA <br /> 3017 Kilgore Road,Suite 100 Project Number 2093,Tracy,CA Reported <br /> Rancho Cordova CA,95670 Project fig- Rusty Benkosky 01/08/02 17 22 <br /> err r�E by <br /> EPA Method 8260E-Quality Control- <br /> Sequoia <br /> ontrniSequoia Analytical-Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Linut Notes <br /> Batch 2AO2018-EPA 5030B(PIT) <br /> Blank(2A02018-BLKI) Prepared&Analyzed 01/02/02 <br /> tert-Butyl alcohol ND 20 ug/l <br /> Methyl tert-butyl ether(MTBE) ND 20 " <br /> Surrogate Dtbromofluoramethane 515 " 500 103 50-150 <br /> Blank(2A02018-BLK2) Prepared&Analyzed 01/03/02 _. <br /> tert-Butyl alcohol ND 20 ug/l <br /> Methyl tert-butyl ether(MTBE) ND 20 " <br /> Surrogate Dtbromofluoramethane 560 500 112 50-150 <br /> LCS(2A02018-BSI) Prepared&Analyzed 01/02/02 <br /> Methyl tert-butyl ether(MTBE) 447 20 ug/l 500 89 65-135 <br /> Surrogate Dlbromofluoromethane 475 500 95 50-150 <br /> LCS(2A02018-BS2) Prepared&Analyzed 01/03/02 _ • <br /> Methyl text-butyl ether(MTBE) 521 20 ug/l Soo 104 65-135 <br /> Surrogate Dibromofluoromethane 559 11500 112 50-150 <br /> Matrix Spike(2A02018-MS1) Source S112339-03 Prepared 01/02/02 Analyzed 01/03/02 <br /> Methyl tert-butyl ether(MTBE) 605 20 ug/1 500 72 107 60-150 <br /> Surrogate Dibromofluoromethane 534 500 107 50-150 <br /> --Matrix Spike Dup(2A02018-MSD1) --- - Source 5112339-03-==-Prepared 01102102-Analyzed 01/03/02— - - — -- <br /> Methyl tert-butyl ether(MTBE) 548 20 ug/l 500 72 95 60-150 10 25 <br /> Surrogate Dibromofluoromethane 535 500 107 50-150 <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 7 of 8 <br />