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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N.Wiget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0 100 <br /> Analytical 1455 McDowell Blvd.North,Ste.D Petaluma,CA 94954 (707)792-1865 FAX(707) 792-0342 <br /> 1551 Industrial Road San Carlos,CA 94070-4111 (650)232-9600 FAX(650) 232-9612 <br /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 2110199 to 2112199 <br /> 9912 Business Park Drive,Stc. 100 Project Number: NIA Received: 2116199 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 312199 <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 /> Blank(continued) 9020225--HLK1 <br /> Surrogate: a,a,a-Trifluorotoluene 2118199 0.200 0.189 mg/kg 60.0-140 94.5 <br /> Ls-'s 9020225-SSI <br /> Benzene 2118199 0.200 0.192 mg/kg 70.0-130 96.0 <br /> Toluene 0.200 0.196 70.0-130 98.0 <br /> Ethylbenzene 0.200 0.195 70.0-130 97.5 <br /> Xylenes(total) 0.600 0.586 70.0-130 97.7 <br /> Methyl tent-butyl ether 0.200 0.188 70.0-130 94.0 <br /> Surrogate: a,a,a-Trifluorotoluene 0.200 0.193 60.0-140 96.5 <br /> Matrix Spike 9020225-MSI S992232-0 <br /> Benzene 2118199 0.200 ND 0.180 mg/kg 60.0-140 90.0 <br /> Toluene 0.200 ND 0.186 60.0-140 93.0 <br /> 0 ylbenzene 0.200 ND 0.185 60.0-140 92.5 <br /> lenes(total) 0.600 ND 0.557 60.0-140 92.8 <br /> Methyl tert-butyl ether 0.200 ND 0.184 60.0-140 92.0 <br /> Surrogate: a,a,a-Trifluorotoluene 0.200 0.185 60.0-140 92.5 <br /> Matri pike Dun 9020225-MSD1 S902232-13 <br /> Benzene 2118199 0.200 ND 0.181 mg/kg 60.0-140 90.5 25.0 0.554 <br /> Toluene 0.200 ND 0.186 60.0-140 93.0 25.0 0 <br /> Ethylbenzene 0.200 ND 0.186 60.0-140 93.0 25.0 0.539 <br /> Xylenes(total) 0.600 ND 0.560 60.0-140 93.3 25.0 0.537 <br /> Methyl tert-butyl ether 0.200 ND 0.184 60.0-140 92.0 25.0 0 <br /> Surrogate: a,a,a-Trifluorotoluene 0.200 0.187 60.0-140 93.5 <br /> Batch: 9020246 Date Prepared: 2/19129 EXtractaon Method, EPA 5030H(Me <br /> Blank 9020246-13I.Kl <br /> Purgeable Hydrocarbons 2119/99 ND mg/kg 1.00 <br /> Benzene ND 0.00500 <br /> Toluene HYD 0.00500 <br /> Ethylbenzene ND 0.00500 <br /> Xylenes(total) ND 0.00500 <br /> Methyl tert-butyl ether ND 0.0500 <br /> Surrogate: a,a,a-Trifluorotoluene 0.200 0.180 60.0-140 90.0 <br /> CS 2020246-BSI <br /> Benzene 2/19/99 0.200 0.191 mg/kg 70.0-130 95.5 <br /> Toluene 0.200 0.194 70.0-130 97.0 <br /> Ethylbenzene 0.200 0.196 70.0-130 98.0 <br /> lenes(total) 0.600 0.587 70.0-130 97.8 <br /> equoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Sandra R. Hanson,Client Services Representative Page 10 of 15 <br />