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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento C 95834 <br /> (916)422 l-9600 <br /> FAX(916)921-0 100 <br /> Analytical <br /> naltical www sequotalabs com <br /> Delta Environmental Consultants(Cameron Park) Project ARCO 2186, Stockton,CA <br /> 3330 Cameron Park Dr Ste 550 Project Number N/A Reported <br /> Cameron Park CA,95682 Protect Manager .Tay Johnson 08/27/01 17 25 <br /> Volatile Oxygenate Compounds by EPA Method 8260A - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1080260- EPA 5030B (MeOH <br /> Blank(1080260-BLK1) Prepared 08/23/01 Analyzed 08/24/01 <br /> Tert-butyl alcohol ND 10 mg/kg <br /> Methyl tert-butyl ether ND 010 " <br /> Di-isopropyl ether ND 010 " <br /> Ethyl tert-butyl ether ND 010 <br /> Tert-amyl methyl ether ND 010 " <br /> Ethanol ND 150 " <br /> 1,2-Dichloroethane ND 010 " <br /> Surrogate 1 2-DCA-d4 219 250 876 60-140 <br /> LCS(10_80260-BSI) Prepared 08/23/01 Analyzed 08/24/01 _ <br /> Methyl tert-butyl ether 244 010 mg/kg 250 976 60-140 <br /> .rogate 1 2-DCA-d4 222 250 886 60-140 <br /> Matrix Spike(1080260-MSI) Source 5108211-09 Prepared 08/23/01 Analyzed 08/24/01 <br /> Methyi tert-butyl ether 209 010 mg/kg 250 ND 836 60-140 <br /> Surrogate 1 2-DCA-d4 _ 199 250 796 60-140 <br /> Matrix Spike Dup(1080260-MSD1) Source 5108211-09 Prepared 08/23/01 Analyzed 08/24/01 <br /> Methyl tert butyl ether _ 2 18 0 10 mg/kg 250 ND 872 60-140 422 25 <br /> Surrogate 12-DCA-d4 200 250 800 60-140 <br /> I <br /> Aft <br /> Sequoia Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 10 of 11 <br />