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Sequoia 819 Striker Avenue Suite 8 4D (916)921-9" Sacramento CA 95834 VAnalytical FAX(916)921-0100 SECOR International Project Arco 4932 Stockton CA Sampled 6/2/99 9912 Business Park Drive,Ste 100 Project Number N/A Received 613199 Sacramento,CA 95827 Pro ect Manager Rusty Benkosky Reported 6124199 Volatile Oxygenate Compounds by EPA Method 8260A/Quality Control Sequoia Analytical-Sacramento Date Spike Sample QC Reporting Limit Recov RPD RPD [Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* Batch. 9060210 Date Prepared, 6114/99 Extractig?a Method,. FPA 5030B (MeOHI Blank 9060210-BLKI Tert-butyl alcohol 6/14/99 ND mg/kg 100 Methyl tert-butyl ether ND 0 100 Di-isopropyl ether ND 0 100 Ethyl tert-butyl ether ND 0 100 Tert-amyl methyl ether ND 0 100 Ethanol ND ISO 1,2-Drchloroethane ND 0100 Surrogate l 2-DCA-d4 2 50 284 600 140 114 US 9060210-B51 Methyl tert-butyl ether 6/14199 250 304 mg/kg 700-130 122 Surrogate 12-DCA d4 250 299 600-140 120 9060210-MS] 5906215-01 Methyl tert-butyl ether 6/14/99 250 HD 287 mg/kg 600-140 115 Surrogate 12-DCA-d4 250 282 600-140 113 Matrix Spike Du p 9060210-MSDI. 5906215-01 Methyl tert-butyl ether 6/14199 250 ND 284 mg/kg 600-140 114 250 0 873 Surrogate 1 2-DCA-d4 11250 2 76 600-140 110 Batch, 9060246 Date Prepared, 6/16199 Extraction Method. EPA 5030B[MeOH] Blank 9060246-BLKI Tert-butyl alcohol 6/17/99 ND mg/kg 100 Methyl tert-butyl ether ND 0 100 Di-isopropyl ether ND 0 too Ethyl tert-butyl ether ND 0 100 Tert-amyl methyl ether ND 0 100 Ethanol ND 150 1,2-Drchloroethane ND 0100 Surrogate 12-DCA-d4 250 2 70 600-140 108 LCS 9069246-BSI Methyl tert-butyl ether 6/16/99 250 2 85 mg/kg 700-130 114 Surrogate l 2-DCA-d4 11250 2 44 600-140 976 Matrix Spike 9060246-MSI $9060.52-04 Methyl tert-butyl ether 6117/99 250 55 5 55 0 mg/kg 600-140 -20 4,D Surrogate 12-DCA-d4 250 225 600-140 900 D Sequoia Analytical -Sacramento *Refer 10 end of report for text of notes and definitions Page 9 of 11