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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> FAX(916)921-0100 <br /> Analytical www.sequ°`a'abs'`°m <br /> SECOR International-Rancho Cordova Project: ARCO 4493,Stockton,CA Sampled: 518/00 <br /> 3017 Kilgore Road,Suite 100 Project Number: NIA Received: 5110100 <br /> Rancho Cordova,CA 95670 Project Manager. Rusty Benkosky Reported: 5118100 <br /> Total Purgeable Hydrocarbons(C6-C12),BTEX and MTBE by DHS LUFT/Quality 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 /> Atrix S ike continued 0050196-MSI S005194-06 <br /> Xylenes(total) 5/17/00 0.600 ND 0.558 'mg/kg 60.0-140 93.0 <br /> Methyl tert-butyl ether _ 0.200 ND 0.140 60.0-140 70.0 <br /> Surrogate: a,a,a-Trifluorotoluene 010.200 0.1921160.0-140 96.0 <br /> Matrix Spike Duy 0050196-MSD1 5005194-06 <br /> Benzene 5/17/00 0.200 ND 0.179 mg/kg 60.0-140 89.5 25.0 2.26 <br /> Toluene 0.200 ND 0.182 60.0-140 91.0 25.0 2.22 <br /> Ethylbenzene 0.200 ND 0.183 60.0-140 91.5 25.0 2.21 <br /> Xylenes(total) 0.600 ND 0.575 60.0-140 95.8 25.0 2.97 <br /> Methyl tert-butyl ether _ - 0.200 ND _0.185 _ °I _ 60.0-140 92.5 _25-0 27.7 5 <br /> Surrogate: a,a,a-Trifluorotoluene 0.200 0.196 60.0-140 98.0 <br /> *Refer to end of report for test of notes and definitions. <br /> Sequoia Analytical-Sacramento <br /> Page 16 of 22 <br />