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1 'r <br /> 680 Chesapeake Drive Pedwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> Sequoia <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707) 792-1865 FAX(707)792-0342 <br /> EMCON-Sac Project ARCO 2130 Stockton CA <br /> 1433 N Market Blvd Sampled 1212198 <br /> Project Number 21775-229 003 Recen ed [213/9' <br /> Sacramento, CA 95834 Project Manager Dave Foley <br /> Reposed 12/17/98 <br /> Volatile Organic Compounds by EPA Method 8260A/Quality Control <br /> Sequoia Analytical -Sacramento <br /> Date Spike Sample QC Reporting Linut Recov RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov Limits % Limit R= <br /> Motes* <br /> Balch. 8120207 <br /> OR [Pill <br /> �h 7-B L K I 3 <br /> Ethanol 1213198 <br /> Tert-butyl alcohol ND D ug/I <br /> N3000 <br /> Methyl tent-butyl ether 200 <br /> ND 2 00 <br /> Di-isopropyl ether �� ND <br /> Ethyl tert-butyl ether 2 00 <br /> Ter(-amyl methyl ether ND 200 <br /> Surrogate 1 2-DCA ND 100 <br /> 500 528 1160 0 140 106 <br /> LCS 8120207-RSI <br /> Methyl Cert-butyl ether 1213198 500 <br /> Surrogate 1 2-DCA-d411 <br /> 2 ug/I 70 0-130 98 4 <br /> 600-140 106 <br /> Matrix Spike 8120207-IV1S1 $$12046-01 <br /> hdftv[tert-butyl ether 1213198 500 ND 506 u /1 <br /> ate 1 2-DCA-d4 g 600-140 101 <br /> SO 0 55 2 600-140 110 <br /> Matrix SPLU Dup 8120207-MSOI 5812046-01 <br /> Methyl tert-butyl ether 12/3/98 50 0 ND 51 2 ug/I 600-140 102 25 0 0 985 <br /> Surrogate 12-DCA-d4 500 576 600-140 115 <br /> Se Analytical -Sacramento *Refer to end of t CPO,-,fa, teat Of'otes acrd rlefiruttons <br /> 4 <br /> Ronald W Bobel Client Services Representative <br /> Page 9 of 10 <br />