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x Sequoia <br /> �.` � 819 Striker Avenue,Suite 8 <br /> r. Sacramento. CA 95834 <br /> I&V Analytical (916)921-9600 <br /> FAX (916) 921-0100 <br /> Emcon-Cameron Park . <br /> Project: ARCO 2186;Stockton Sampled: 6124199 to 6/25/99 <br /> 3939 Cambridge Road,Ste.202 Project Number: N/A <br /> Cameron Park,CA 95682Received: 6/25/99 <br /> Project Manager- Mark Capps Reported: 7/11/99 <br /> volatile Oxygenate CorriptFunds byTPA+Method 8260A/,Quality Control <br /> y <br /> Segiiaia•Analyfical ?Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result <br /> Result Units Recov.Limits % Limit % Notes* <br /> Batch, <br /> Date Prepared, 7/1/99 <br /> B <br /> R_ 1 <br /> Tert-butyl alcohol 7/l/99 <br /> 7/I/99 <br /> Methyl tart-butyl ether " ND mg/kg 10.0ND <br /> Di-isopropyl ether 0.100 <br /> Ethyl tert-butyl ether ND 0.100 <br /> Tert-amyl methyl ether ND 0.100 <br /> Ethanol ND 0.100 <br /> .Surrogate: 1,2-DCND 150A-d4 " 2.50 2.62 <br /> 60.0-140 105 <br /> Imo& 90700 - c1 <br /> Methyl tert-butyl ether 7/1199 2.50 2.13 mg/kg 70.0-]30 $5.2 <br /> Surrogate: 1,2-DCA-d4 2.50 1.58 <br /> 60.0-140 103 <br /> Matrix Sj2ike M 0 IQ_MSt S906417-15 <br /> Methyl tert-butyl ether /k 7/1/99 2.50 ND 2.15 mg <br /> Surrogate: 1,2-DCA-d4 g 60.0-140 86.0 <br /> 2.50 2.41 60.0-140- 96.4 <br /> 9470010-MSS 5906417-15 <br /> Methyl tert-butyl ether 7/1/99 2.50 ND 1.93 mg/kg 60.0-140 77.2 25.0 10.8 <br /> Surrogate: 1,2-DCA-d4 2.50 2.31 <br /> 60.0-140 92.4 <br /> Batch-, <br /> Dale Prepared-- 716199 Extra <br /> B <br /> 907002L-Dial <br /> alcohol <br /> Methyl ter#-butyl ether 717/99 ND mg/kg 10.0ND " <br /> Di-isopropyl ether 0.100 <br /> Ethyl tert-butyl ether ND 0.100 <br /> " <br /> Tert-amyl methyl ether ND 0.100ND 0.100 <br /> Ethanol <br /> " <br /> Surrogate: l,l-DCA-d4 " ND 1502 SO <br /> 2.81 <br /> 60.0-140 Ill <br /> �ethy't <br /> ert-butylete: 1,2-DCA d4 2.61 mg/kg 70.0-130 ]04 <br /> 2.SO 2.71 60.0-140 108 <br /> Matrix Spike 9070075-MS1 S906437-11 <br /> Methyl tent-butyl ether 7/8/99 2.50 ND 2.24 mg/kg 60.0-140 89.6 <br /> Surrogate; 1,2-DCA44 11 2.50 2.46 <br /> 60.0-140 98.4 <br /> 7007 -HIMI 5906437-11 <br /> Methyl tart-butyl ether 7/8/99 , 2.50 ND 2.27 mg/kg 60.0-140 90.8 25.0 I.33 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 14 of 16 <br />