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' Striker Avenue, Suite 8 <br /> Sequoia 819 Sacramento,CA 95834 <br /> l (916) 921-9600 <br /> Analytical FAX(916)921-0100 <br /> F <br /> EMCON-Sac Project: ARCO 2186,Stockton,CA Sampled: 6121/99 <br /> 1433 N.Market Blvd. Project Number: 21775-237-002 Received: 6/21/99 <br /> Sacramento,CA 95834 Project Manager: Mark Capps <br /> Reported- 6/22/99 <br /> Volatile Oxygenate-Compounds by RPA Method 8260A/Quality Control <br /> •Sequbia� nalytical-Sacramento' - <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov.Limits % Limit % Notes• <br /> Batch: 9060309 DIJU&pared: 6121/99 Extraction M�thod: EPA 5030B l`MeOHl <br /> Man-1i 9060309-BLK 1 <br /> Tert-butyl alcohol 6/21/99 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 /> Ten-amyl methyl ether NA 0.100 <br /> Ethanol ND 150 <br /> Surrogate: 1,2-DC444 2.50 2.33 60.0-140 93.2 <br /> LCS 9060309-BSI <br /> Methyl tert-butyl ether 6/21/99 2.50 2.49 mg/kg 70.0-130 99.6 <br /> Surrogate: 1,2-DCA44 2.50 2.36 60.0-140 94.4 <br /> Sequoia Analytical-Sacramento *Refer to end ofreport for text ofnotes and definitions. <br /> Page 4 of 5 <br />