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819 Striker Avenue.Suite 8 <br /> Sequoia Sacr amento.CA 5834 <br /> (916)92199600 <br /> i!DFAX(916)921-0100 <br /> wr Analytical www.sequoialabs.com <br /> SECOR International-Rancho Cordova Project: ARCO 4493, Stockton,CA Sampled: 6/2/00 <br /> 3017 Kilgore Road,Suite 100 Project Number: N/A Received. 6/6/00 <br /> Rancho Cordova,CA 95670 Project Manager: Rusty Benkos Reported: 6/16100 <br /> Total Purgeable Hydrocarbons(C6-Cl2), 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 /> Blank continued 0060127-BLKI <br /> Surrogate: a,a,a-Tri,Jluorotoluene 6/13/00 0.200 0.188 mg/kg 60.0-140 94.0 <br /> LCS 0060127-BSI <br /> Benzene 6/13/00 0.200 0.184 mg/kg 70.0-130 92.0 <br /> Toluene 0.200 0.190 70.0-130 95.0 <br /> Ethylbenzene 0.200 0.189 70.0-130 94.5 <br /> Xylenes(total) 0.600 0.536 70.0-130 89.3 <br /> Methyl tent-butyl ether _ _ _ 0.200 _ 0.165 _70.0-130 82.5 <br /> Surrogate: a,a,a-Trifluorotoluene 0.200 0.198 60.0-140 99.0 <br /> Matrix Spike 0060127-MSI S006120-54 <br /> Benzene 6113/00 0.200 ND 0.162 mg/kg 60.0-140 81.0 <br />*In, 0.200 ND 0.168 60.0-140 84.0 <br /> nzene 0.200 ND 0.170 60.0-140 $5.0 <br /> XI <br /> (total} 0.600 ND 0.484 60.0-140 80.7 <br /> Methyl tert-butyl ether _ _ 0.200 ND 0.146 "_ _ 60.0-140 _ 73.0 <br /> Surrogate: a,a,a-Trifluorotoluene 0.200 0.195 60.0-140 97.5 <br /> Matrix Spike Dup 0060127-MSD1 S006120-54 <br /> Benzene 6/13/00 0.200 ND 0.161 mg/kg 60.0-140 80.5 25.0 0.619 <br /> Toluene 0.200 ND 0.167 60.0-140 83.5 25.0 0.597 <br /> Ethylbenzene 0.200 ND 0.169 60.0-140 84.5 25.0 0.590 <br /> Xylencs(total) 0.600 ND 0.483 60.0-140 80.5 25.0 0.248 <br /> Methyl tent-butyl ether 0.200 ND 0.145 60.0-140 72.5 25.0 0.687 <br /> Surrogate: a.a,a-Trifluorotoluene 0.200 0.197 60.0-140 98.5 <br /> Sequoia Analytical-Sacramento "Refer to end of report for text of notes and definitions. <br /> Page 9 of 1 i <br />