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680 Chesapeake Drive Redwood City CA 94063 (650)364 9600 FAX(650)364 9233 <br /> Sequoia 404 N Wiget Lane Watnut Creek CA 94598 (925)988 9600 FAX(925)988 9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 {916)921 9600 FAX(916)921 o 100 <br /> N&ffAnalytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792 1865 FAX(707)792 0342 <br /> 155 t tndustnal Road San Carlos CA 94070 4 1 t t (650)232 9600 FAX(650)232 9612 <br /> 9 <br /> EMCON-Sac Project ARCO 2130,Stockton,CA <br /> 1433 N Market Blvd Sampled 3/31/99 <br /> Project Number 21775-229 004 Received 4/1/99 <br /> Sacramento,CA 95834 Project Manager Dave Foley Reported 4/15/99 <br /> Volatile Oxygenate Compounds by EPA Method 8260A/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Sptke Sample QC Reporting Limit Recov RPD R=Not,,- <br /> Analyte Analyzed Level Result Result Units Recov Limits % Limil <br /> Batch. 9Q40103 <br /> Blank soao, I(I Extradmill Method, E[!A 5030R[P/TJ <br /> Tert-butyl alcohol 4/8/99 <br /> Methyl tert-butyl ether ND ug/l 200 <br /> ND 2 00 <br /> Dl-isopropyl ether " ND " <br /> Ethyl tert-butyl ether 2 00 <br /> ND <br /> Tert-amyl methyl ether �� ND 2 002 00 <br /> Ethanol <br /> Surrogate 1 2-DCA-d4 ND 3000 <br /> SO 0 <br /> 576 60 0-140 II S <br /> � 9040103-RS1 <br /> Methyl tert-butyl ether 4/8/99 500 <br /> 564 ugl[ 70 0-130 l 13 <br /> Surrogate 12-DCA-d4 <br /> 50 0 57 4 60 0-140 115 <br /> Matrix Spike 9-040103-MS1 5904428-01 <br /> I tert-butyl ether 4/8/99 500 <br /> gate 12-DCA-d4 3 92 580 ug/! 600-140 108 <br /> SO 0 57 0 600-140 114 <br /> 9040103-MMSDI 59 4028-01 <br /> Methyl tert-butyl ether 4/8/99 500 3 92 <br /> 574 ug/1 600-140 <br /> Surrogate 12-DCA-d4107 25 0 0 930 <br /> SO 0 586 6 0 0-140 117 <br /> Seq Analytical -Sacramento *Refer to end of report for text of notes and defoutrons <br /> Ronald W Bobel,Client Services Representative <br /> roc�, Page 8 of 9 <br />