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6061 Chesapeake Drive Redwood City,CA 94063 (650) 364-9600 FAX(650)364-9Z33 <br /> Sequoia 404 N.Wiget lane Walnut Creek,CA 94598 (9Z5)988-%00 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento.CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDow_ell Blvd.North.Ste.D Petaluma CA 94954 (707) 792-[8605 FAX(707)792-0342 <br /> EMCON-Sac• Project: ARCO 2186,Stockton,CA Sampled: 12/14/98 <br /> 1433 N. Market Blvd. Project Number: 21775-237-003 Received: 12/15/98 <br /> Sacramento, CA 95834 Project Manager: Dave Foley Reported: 12/31/98 <br /> Volatile Organic Compounds by EPA Method 8260A/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RFD <br /> Analyte Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> Batch. 8120321 Date Prepped: I2()H19$ Extraction Uethod; EPA 5030B IP/TI <br /> Blank 8120321-I31.K1 <br /> Ethanol 12/18/98 ND ug/1 3000 <br /> Tert-butyl alcohol ND 200 <br /> Methyl tert-butyl ether ND 2.00 <br /> Di-isopropyl ether ND 2.00 <br /> Ethyl tert-butyl ether ND 2.00 <br /> Ter(-amyl methyl ether ND " 2.00 <br /> Surrogate: 1,2-DCA-d4 50.0 51.8 " 60.0-140 104 <br /> LC-S $LZQ3 1-651 <br /> Methyl tert-butyl ether 12/18/98 50.0 55.3 ug/l 70.0-130 111 <br /> Surrogate: 1,2-DCA-d4 50.0 52.5 1160.0140 105 <br /> 8120321-MSI 5812213-01 <br /> I t. Cert-butylether 12/18/98 50.0 22.8 78.2 ug/l 60.0-140 111 <br /> surrogate: 1,2-DCA-d4 11 50.0 55.4 60.0-140 111 <br /> 4atr4x Spike DIM 8120321-MSDI 5812213-01 <br /> Methyl tert-butyl ether 12/18/98 50.0 22.8 77.6 ug/1 60.0-140 110 25.0 0.905 <br />'urrogate: 1,2-DCA-d4 50.0 53.1 60.0-140 106 <br /> �it <br /> quoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> nald W. Bobel,Client Services Representative Page 8 of 9 <br />