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� <br /> Sequoia Sacramento, <br /> Striker Avenue, Suite 8 <br /> Sacramento,CA 95834 <br /> (916)921-9600 <br /> FAX(916)921-0 00 <br /> Analytical <br /> 0 <br /> EMCON/Pinnacle-Sacramento Project: ARCO 2186,Stockton,CA Sampled: 9/10/99 <br /> 1433 N.Market Blvd. Project Number: 792232 Received: 9/13199 <br /> Sacramento, CA 95834 Project Manager: Dave Foley Reported: 9127199 <br /> Total l'iirgeable Hydraearbons(C6-C12),BTEX aiW MTBE by DHS LOFT/Quality Control <br /> Sequoia Analytieal-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov.Limits % Limit % Notes* <br /> Blank continued 9090223-BLK1 <br /> Surrogate: a.a,a-Triuorotoluene 9/21/99 10.0 9.53 ug/l 60,0-140 45.3 <br /> LCS 9090223-BSI <br /> Benzene 9121/99 10.0 9.46 ug/1 70.0-130 94.6 <br /> Toluene 10.0 9.17 70.0-130 91.7 <br /> Ethylbenzene 10.0 9.15 70.0430 91.5 <br /> Xylenes(total) 30.0 27.3 70.0-130 91.0 <br /> Methyl tert-butyl ether " " 10.0 9.78 70.0-130 97.8 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 9.19 60.0-140 92.9 <br /> Matrix Spike 9090223-MSI 5909173-01 <br /> Benzene 9/21199 10.0 ND 9.83 ug/1 <br /> 60.0-140 98.3 <br /> Toluene 10.0 ND 9.72 60.0-140 97.2 <br /> Ethyibenzene 10.0 ND 9.65 60.0-140 96.5 <br /> Oes(total) 30.0 ND 28.8 60.0-140 96.0 <br /> YJ <br /> tert-butyl ether "_ 10.0 ND 11.1 60.0-140 111 _ <br /> Surrogate: a,a,a-Triuorotoluene 10.0 10.9 60.0-140 109 <br /> Matrix Spike Dup 9090223-MSD1 S909173-01 <br /> 9.92 ug/1 60.0-140 99.2 25.0 0.911 <br /> Benzene 9121199 10.0 ND <br /> Toluene 10.0 ND 9.87 60.0-140 98.7 25.0 1.53 <br /> Ethylbenzene 10.0 ND 9.82 60.0-140 98.2 25.0 1.75 <br /> Xylenes(total) 30.0 ND 29.3 60.0-140 97.7 25.0 1.76 <br /> Methyl tert-butyl ether 10.0 ND 11.5 60.0-140 115 25.0 3.54 . <br /> Surrogate: a,a,a-Triuorotoluene 10.0 10.7 60.0-140 107 <br /> is Analytical-Sacramento *Refer to end of report for text of notes and denttions. <br /> Page 6 of 9 <br />