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• 680 Chesapeake Drive Redwood City,CA 94063 (650)36496M FAX(650)364-9233 <br /> a 404 N.Wiget lane Walnut Creek,CA 94598 (925)988-9600 FAX(9251 988-9673 <br /> S e ql1 o X <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)92 1-0 100 <br /> 551IndustrialdusaRoad <br /> North.Ste. D San Petaluma, <br /> Anaytical : Carlos.CA 94070-4111 (6 0)232-9600 FAX(650) 232-9612 <br /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 4/13199 <br /> 9912 Business Park Drive,Ste. 100 Project Number N/A Received- 4114/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 4/19199 <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 <br /> Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> Batch-, ate Prepared: 4/15/99 <br /> Blank 9040169-R1.K1 <br /> Purgeable Hydrocarbons 4/15/99 ND mg/kg 1.00 <br /> Benzene ND 0.00500 <br /> Toluene ND 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-Trifluoratoluene 0.200 0.205 60.0-140 102 <br /> 1.CS 204Q 69-BSI <br /> Benzene 4/15/99 0.200 0.201 mg/kg 70.0-130 101 <br /> Toluene 0.200 0.217 70.0-130 108 <br /> Ethylbenzene 0.200 0.217 70.0-130 108 <br /> lenes(total) 0.600 0.585 70.0-130 97.5 <br /> thyl tert-butyl ether 0.200 0.188 70.0-130 94.0 <br /> urrogale: a,a,a-Trifluoratoluene 0.200 0.207 60.0-140 103 <br /> Matrix Spike 9040169-MS1 5904159-20 <br /> Benzene 4/15/99 0.200 ND 0.187 mg/kg 60.0-140 93.5 <br /> Toluene 0.200 ND 0.198 60.0-140 99.0 <br /> Ethylbenzene 0.200 ND 0.198 60.0-140 99.0 <br /> Xylenes(total) 0.600 ND 0.538 60.0-140 89.7 <br /> Methyl tert-butyl ether 0.200 ND 0.179 60.0-140 89.5 <br /> Surrogate: a,a,a-Trifluorotoluene 0.200 0.197 60.0-140 98.5 <br /> Matrix Spike Dup 9040169-MSD1 5294.120 <br /> Benzene 4/15/99 0.200 ND 0.191 mg/kg 60.0-140 95.5 25.0 2.12 <br /> Toluene 0.200 ND 0.193 60.0-140 96.5 25.0 2.56 <br /> Ethylbenzene 0.200 ND 0.202 60.0-140 101 25.0 2.00 <br /> Xylenes(total) 0.600 ND 0.549 60.0-140 91.5 25.0 1.99 <br /> Methyl tert-butyl ether 0.200 ND 0.184 60.0-140 92.0 25.0 2.75 <br /> Surrogate: a,a,a-Trifluorotoluene 0.200 0.206 60.0-140 103 <br /> i <br /> equoia Analytical -Sacramento *Refer to end of report for text of notes and definitions. <br /> a2K�jlQfr�- <br /> Sandra R. Hanson,Client Services Representative Page 6 of 12 <br />