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4D Sequoia 819 Striker Avenue,Suite 8 <br /> Sacramento, CA 95834 <br /> I„W 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 EPA Method 8260A/Quality Control w <br /> Sequoia Analytical—Sacramento U M <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov.Limits % Limit % Notes* <br /> Matrix Snik Dup(continued) 907007__ 5-MSDI 5906437-11 <br /> Surrogate: 1,2-DCA-d4 718/99 2.50 2.50 mg/kg 60.0-140 100 <br /> Batch: 9 D-ale Prepared: 7/9/99 Extraction Method: RPA 5030B [M O .1 <br /> RbRk 907012�KI <br /> Tert-butyl alcohol 7/9/99 <br /> Methyl tert-butyl ether ND mg/kg 10.0 <br /> ND 0.100 <br /> Di-isopropyl ether ND " <br /> Ethyl tert-butyl ether 0.100 <br /> Tert-amyl methyl ether ND 0.100 <br /> Ethanol �� <br /> ND 0.100 <br /> ND 150 <br /> Surrogate: 1,2-DCA-d4 2.50 2.90 60.0-140 116 <br /> I' <br /> 9070121-BSI <br /> Methyl tert-butyl ether 7/9/99 2.50 <br /> Surrogate: 1,2-DCA-d4 2.51 mg/kg 70.0-130 100 <br /> 2.50 1.92 60.0-140 117 <br /> Matrix Spike 9070121-MSI S906437-15 <br /> Methyl tert-butyl ether 7/9/99 2.50 ND 2.41 . mg/kg <br /> Surrogate: 1,2-DCA-d4 g g 60.0-140 96.4 <br /> 2.50 2.46 60.0-140 98.4 <br /> Matrix Spike D p 9070121-MSD] 5906437-15 <br /> Methyl tert-butyl ether 7/9/99 2.50 ND 2.39 mg/kg 60.0-140 95.6 25.0 <br /> Surrogate: 1,2-DCA-d4 2.50 2 46 " <br /> 0.833 <br /> 60.0-140 98.4 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 15 of 16 <br />