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Sequoia <br /> 819 Striker Avenue,Suite 8 <br /> Sacramento, CA 95834 <br /> Analytical (916) 921-9600 <br /> FAX(916)921-0100 <br /> Emcon-Cameron Park <br /> Project: ARCO 2186,Stockton Sampled: 6/24/99 to 6/25/99 <br /> 3939 Cambridge Road,Ste.202 Project Number: N/A <br /> Received: 6/25/99 <br /> Cameron Park,CA 95682 <br /> Project Manager: Mark Capps Reported: 7/11/99 <br /> Volatile Oxygenate Compounds by EPAMethod 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 /> Batch: 9070010 Date Prepared- 711/99 Extraction Method PA 5030B[l\ O}l1 <br /> Blank 90700_ ]0-BI,Kl <br /> Tert-butyl alcohol 7/1/99 ND mg/kg <br /> Methyl tert-butyl ether g g 10.0 <br /> ND 0.100 <br /> Di-isopropyl ether ND " <br /> Ethyl tert-butyl ether ND 0.100 Tert-amyl methyl ether ND " 0.100 <br /> Ethanol „ 0.100 <br /> Surrogate: 1,2-DCA-d4 ND 1502 50 162 „ <br /> 60.0-140 105 <br /> LES 90700_ 10-B <br /> Methyl cert-butyl ether 7/1/99 2.50 <br /> Surrogate: 1,2-DCA-d4 2mg/kg 7 85.2 <br /> 2.50 1.5588 60..0-140-14 0 0 103 <br /> Matrix x- Spok 9070010-MS1 5906417-15 <br /> Methyl cert-butyl ether 7/1/99 2.50 ND 2.15 mg/kg <br /> Surrogate: 1,2-DCA-d4 60.0-140 86.0 <br /> 2'50 2.41 60.0-140 96.4 <br /> Matrix Spike D p 9070010-M D1 5906417-15 <br /> Methyl tent-butyl ether 7/1/99 2.50 ND /k 1.93 mg <br /> Surrogate: 1,2-DCA-d4 g 60.0-140 77.2 25.0 10.8 <br /> 2.50 2.3160.0-140 92.4 <br /> Batch: 907007 Date Prepared: 7/6/99 __Extraction Method: EPA 500B[MCOH] <br /> Blank 9070075-B .K1 <br /> Tert-butyl alcohol 7/7/99 <br /> Methyl tert-butyl ether ND mg/kg 10.0 <br /> ND 0.100 <br /> Di-isopropyl ether ND 0.100 <br /> Ethyl tert-butyl ether ND 0.100 <br /> Tert-amyl methyl ether ND 0.100 <br /> Ethanol <br /> SuND 150 <br /> rrogate. /,2-DCA-d4 2.50 2.81 60.0-140 112 <br /> ILCS 9070075-BS <br /> Methyl tert-butyl ether 7/7/99 2.50 2.61 mg/kg 70.0-130 104 <br /> Surrogate: 1,2-DCA-d4 11 2.50 2.71 60.0-140 108 <br /> Matrix- Spike 9070075-MS1 S906437-11 <br /> Methyl tert-butyl ether 7/8/99 2.50 ND 2.24 mg/kg <br /> Surrogate: 1,1-DCA-d4 g g 600 89.6 <br /> " 2.50 2.46 60.00-/4-14 0 98.4 <br /> Matrix Spike D ro 9070075-M D1 S906437-11 <br /> Methyl tert-butyl ether 7/8/99 2.50 ND 2.27 mg/kg g g 60.0-140 90.8 25.0 1.33 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 14 of 16 <br />