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1 <br /> / a ` Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650)364=9133 <br /> 404 N.Wiget Lane Walnut Creek.CA 94598 (925)988-960p FAX(92S)988-9673 <br /> Analy1 �7Y7 819 Striker Avenue.Suite 8 Sacramento.CA 95834 (916)921-9600 FAX(916)921-0100 <br /> L M 1455 McDowell Blvd.North,Ste.D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342- <br /> ! Pin <br /> AX(707)792-0342 <br /> =Cambridge <br /> Project: ARCO,5469, Stockton CA Sampled: =2/25,3/�3/99 <br /> Road,Ste.224Project Number: N1A Received:CA 95682 Project Manager: Mark Capps Reported: <br /> Volatile Oxygenate Compounds by EPA Method 8260A/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RAD RPD <br /> Analyte Analyzed Level Result Resu[r Units Recov; Limits % Limit % Notes* <br /> J13atch:-2020258 ate Prepared- M2/9Exlr�c tion Method: EPA 5Q3 <br /> 9 <br /> Blank 902025!3-81.10 1 <br /> Ethanol 2/22/99 ND mg/kg 150 <br /> Tert-butyl alcohol ND 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-amy[methyl ether ND 0.100 ` <br /> Surrogate: 1,1-DCA-d4 2.50 1172 60.0-140 109 <br /> L� 9020258-851 <br /> Methyl tert-butyl ether 2123199 2.50 2.78 mg/kg 70.0-130 111 <br /> Surrogate: 1,2-DCA-d4 2.50 2.75 60.0-140 110 <br /> Matrix Spoke 5902287-11 <br /> Methyl tert-butyl ether 2123/99 2.50 ND 2:63 mg/kg 60.0-140 105 <br /> Surrogate: 1,2-DCA-d4 1.50 - -2.57 <br /> 60.0-140 103 <br /> Matrix Spkg Up 202025 -M5DI ,5902287-11 <br /> Methyl tert-butyl ether 2/23/99 2.50 ND 2.58, mg/kg 60.0-140 103 25.0:-- 1.92 <br /> Surrogate: 1,2-DCA-d4 2.50. 2.47 60.0-140 98.8 <br /> i <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> ).A- <br /> Zonald W. Babel,Client Services Repre entative Page 8 of 9 <br /> i i' <br />