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1 +n C• ,� <br /> ►'!` ����o�� 819 Striker Avenue. Suite 8 <br /> Sacramento,CA 95834 <br /> (9 16)92t-9600 <br /> Analytical FAX(916)921-0100 <br /> EMCON/Pinnacle-Cameron Park Project: ARCO 2186,Stockton Sampled: 8123199 to 8126/99 <br /> 3939 Cambridge Road,Ste, 220 Project Number: NIA Received: 8127199 <br /> Cameron Park,CA 95682 Project Manager: Mark Capps Reported: 9113199 <br /> V61atile oxygenate Coiripo'uiiids by EPA Method 8260AJQdality Control <br /> Sequoia Analytical-•Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov.Limits % Limit % Notes* <br /> Matrix Spike(continued) 2M4zu--3S1 5908348-01 <br /> Surrogate: 1,2-DCA-d4T 8131199 50.0 58.4 ug/1 60.0-140 117 <br /> Matrix Spike Dun 9080250-MSD1 S248348-01 <br /> Methyl tert-butyl ether 8131/99 50.0 ND 54.0 ug/l 60.0-140 108 25.0 5.41 <br /> Surrogate: 1,2-DCA-d4 " 50.0 59.4 '1 60.0-140 119 <br /> Batch: 9080273 J)ate Prepared- 8/31/99 Extractio <br /> Blank 9080273-BLK1 <br /> Tert-butyl alcohol 911/99 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 /> Tert-amyl methyl ether ND 0.100 <br /> Ethanol ND 150 <br /> ate: 1,2-DCA-d4 2.50 2.56 60.0-140 101 <br /> L 9080273=11 <br /> Methyl tert-butyl ether 9/1/99 2.50 2.16 mg/kg 70.0-130 86.4 <br /> Surrogate: 1,2-DCA-d4 If 2.50 2.54 60.0-140 102 <br /> Matrix Spike 9080273-MS1 S908358-11 <br /> Methyl tert-butyl ether 9/1/99 2.50 ND 2.05 mg/kg 60.0-140 82.0 <br /> Surrogate., 1,1-DCA-d4 2.50 2.33 60.0-140 93.2 <br /> Matrix S ikkc Dun - 5908358-11 <br /> Methyl tert-butyl ether 911199 2.50 ND 2.08' mg/kg 60.0-140 83.2 25.0 1.45 <br /> Surrogate: 1,2-DCA-d4 2.50 2.36 60.0-140 94.4 <br /> �ia�Analyt�xal- cramento *Refer to end of report for text of notes and definitions. <br /> Page 17 of 18 <br />