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Sequoia 819 Striker Avenue, S 4 <br /> Sacramento CA 95858 34 <br /> A1916)921-9600 <br /> Analytical <br /> FAx (916)921-0 1oa <br /> EMCON-Sac Project ARCO 2130,Stockton,CA Sampled 6/4/99 to 6/6/99 <br /> 1433 N Market Blvd Project Number 21775-229 004 Received 6/7/99 <br /> Sacramento,CA 95834 Project Manager Dave Foley Reported 6/27/99 <br /> Volatile Oxygenate Compounds by EPA Method 8260A/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Lf-S Dup{continued/ 906024$_13D <br /> Surrogate 12-DCA-d4 6/15/99 500 476 u9/1 600-140 952 <br /> Matrix Spike 9060248-MSI S906114-06 <br /> Methyl tert-butyl ether 6115/99 500 370 562 ug/I 600-140 105 <br /> Surrogate 1,2-DCA-d4 11500 488 600-140 976 <br /> Matrix Spike Dup 9060248-MSDI 5906114-06 <br /> Methyl tert-butyl ether 6/15/99 500 370 560 ug/l 600-140 105 250 0 <br /> Surrogate 1,2-DCA-d4 It <br /> 500 476 600-140 952 <br /> �oia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Page 10 of i 1 <br /> r9% <br />