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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento, -96W <br /> 95834 <br /> (916)9Z 921-9600 <br /> 4 FAX(916)921-oloo <br /> (D <br /> 14WAnalytical www.sequoialabs.com <br /> 0 <br /> SECOR International-Rancho Cordova Project: ARCO 4493, Stockton,CA Sampled: 6/2100 <br /> 3017 Kilgore Road,Suite 100 Project Number: N/A Received: 6/6/00 <br /> Rancho Cordova,CA 95670 Project Manager: RusLy Benkosky Reported: 6/16/00 <br /> Volatile_Oxygenate_Compounds_by�EEA,Method_826OALQuality_Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> lAnalyte_ Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> Batch: 0060088 Date Prepared:_618100 Extraction Method: EPA 50308 McOH <br /> Blank 0060088-BLKI <br /> Tert-butyl alcohol 619100 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 /> Ethanol ND 150 <br /> 1,2-Dichloroethane ND 0.100 <br /> Ethylene dibromide ND 0.100 <br /> Surrogate: 1,2-DCA-d4 2.50 2.19 60.0-140 87.6 <br /> LCS 0060088-BSI <br /> Methyl tert-butyl ether 6/9/00 2.50 2.16 mg/kg 70.0-130 86.4 <br /> Surrogate: 1,2-DCA-d4 112.50 2.29 0160.0-140 91.6 <br /> Matrix Spike 0060088-MSI 5006012-05 <br /> Methyl tert-butyl ether 6/9100 2.50 ND 2.04 mg/kg 60.0-140 81.6 <br /> Surrogate: 1,1-DCA-d4 2.50 2.19 ro60.0-140 87.6 <br /> Matrix Spike Dup 0060088-MSDI S006012-05 <br /> Methyl tent-butyl ether 619100 2.50 ND 2.01 mg/kg 64.0-140 80.4 25.0 1.48 <br /> Surrogate: 1,2-DCA-d4 2.50 2.16 60.0-140 86.4 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 10 of 11 <br />