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1 <br /> Sequoia f i 819 Striker Avenue,Suite 8 <br /> Y� Sacramento,CA 95834 <br /> 14W Analytical (916)921-9600 <br /> FAX(916)921-0100 <br /> E <br /> ON-Cameron ParkProject: ARCO 2186,Stockton,CASampled: 6121/99 <br /> Cambridge Rd.Suite 200 Project Number: 21775-237-002 <br /> on Park,CA 956$2 Received: 6/21/99 <br /> Project Manager: Mark Caps Reported: 6129/99 <br /> ValaEile Oxygenate"Compounds b ESA Method, r' <br /> x .,,.,,�� Y.,� <br /> a..;. -1Sequo>laAnaly��tcal, a-e <br /> Srarnentoa <br /> Anal <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov. Limits % Limit <br /> % Notes* <br /> BAIRN- 9060309 te DaPremed -6/21/99 ExtraCtion Mahad: EPA 503 <br /> Dia309-t31.K1 <br /> Tert-butyl alcohol 6/21 <br /> 612!199 ND mg/kg 10.0 <br /> Methyl Leri-butyl ether � NA <br /> Di-isopropyl ether 0.100 <br /> Ethyl tcrt-butyl ether " ND 0.100ND <br /> Tert-amyl methyl ether 9.100 <br /> Ethanol ND 0.100 <br /> Surrogate:.1,2-DCA-d4 ND 150 <br /> • 2,SO 2.33 60.0-140 93.2 <br /> � 4060309-RRi <br /> Methyl tert-butyl ether 6/21/99 2.50 <br /> Surrogate: 1,2-DCA-d4 2.49 mg/kg 70.0-130 99.6 <br /> 1.50 2.36 60.0440 94.4 <br /> Matcix.Spike 2Q�309_MS1 q 319_01 <br /> Methyl tert-bury]ether 6/23/99 2.50 1 I.D ]1.9 m /k <br /> Surrogate.• 1,2-DC,4-d4 g g 6D.0-140 36.0 � <br /> 2.50 L9S , 60.0-Ia0 78.0 <br /> Methy!tert-butyl ether � S90fi319-01 <br /> 6/23/99 2.50 -11.0 12.2 mg/kg 60.0-140 4$.0 25.0 28.5 I <br /> Surrogate; 1,2-DCA-d4 2 SO <br /> 2.0� 60.0-140 82.4 , <br /> I <br /> I <br /> i <br /> I <br /> Sequoia Analytical-Sacramento <br /> *Refer to end of report for text of notes and definitions. <br /> I <br /> Page 7 of 8 <br />