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Sequoia 819 Striker Avenue, Suite 8 <br /> Sacramento,CA 95834 <br /> (916)921-9600 <br /> 14W Analytical FAX(916)921-0100 <br /> SECOR International Project: ARCO 434,Lodi,CA Sampled: 6/18/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 6/18/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 7/6/99 <br /> Volatile Oxygenate Compounds by EPA Method 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* 9060419 Date Prepared: 6/29/99 Extraction Method: EPA 50308[MeOHI <br /> Blank 9060419-BLKI <br /> Tert-butyl alcohol 6/30/99 ND mg/kg 10.0 <br /> Methyl cert-butyl ether ND 0.100 <br /> Di-isopropyl ether ND 0.100 <br /> Ethyl cert-butyl ether ND 0.100 <br /> Tert-amyl methyl ether ND 0.100 <br /> 1,2-Dichloroethane ND 0.100 <br /> Surrogate: 1.2-DCA-d4 1.50 2.78 60.0-140 /11 <br /> L-CS 9060419-BSI <br /> Methyl tert-butyl ether 6/30/99 2.50 2.65 mg/kg 70.0-130 106 <br /> Surrogate: 1,2-DCA-d4 2.50 2.95 60.0-140 118 <br /> Matrix Spike 9060419-MSI 5906400-04 <br /> Methyl tert-butyl ether 6/30/99 2.50 ND 2.34 mg/kg 60.0-140 93.6 <br /> Surrogate: 1,2-DCA-d4 " 1.50 2.57 60.0-140 103 <br /> Matrix Spike Dup 9060419-MSDI S906400-04 <br /> Methyl tert-butyl ether 6/30/99 2.50 ND 2.43 mg/kg 60.0-140 97.2 25.0 3.77 <br /> Surrogate: 1,2-DCA-d4 2.50 1.64 60.0-140 106 <br /> Batch: 9070009 Date Pretnred: 7/1/99 Extraction Method: EPA 5030B[MeOH] <br /> Bhtnk 9070009-BLKI <br /> Tert-butyl alcohol 7/2/99 ND mg/kg 10.0 <br /> Methyl tert-butyl ether 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 /> 1,2-Dichloroethane ND 0.100 <br /> Surrogate: 1,1-DCA-d4 1.50 2.66 60.0-140 106 <br /> LES 9070009-BS1 <br /> Methyl tert-butyl ether 7/2/99 2.50 2.40 mg/kg 70.0-130 96.0 <br /> Surrogate: 1,1-DCA-d4 1.50 1.87 60.0-140 115 <br /> Matrix _,_Spike 9070009-MSI 5906417-01 <br /> Methyl tert-butyl ether 7/1/99 2.50 ND 2.32 mg/kg 60.0-140 92.8 <br /> Surrogate: 1,1-DCA-d4 2.50 2.66 " 60.0-140 106 <br /> Sequoia Analytical-Sacramento *Refer to end ofreport for tett ofnotes and definitions. <br /> Page 12 of 14 <br /> `t%y <br />