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Sequoia680 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)9Z 1-0100 <br /> Analytical 1455 McDowell Blvd.North,Ste. D Petaluma,CA 94954 (707) 79Z-1865 FAX(707)792-0342 <br /> 1551 Industrial Road San Carlos,CA 94070-41 1 1 (650)23Z-9600 FAX(650)232-9612 <br /> =Cambridge <br /> Project: ARCO,5469, Stockton CA Sampled: 2/1 1/99 <br /> Road,Ste. 220 Project Number: N/AA 95682 Received: 2/12/99 <br /> Project Manager: Mark Capps Reported: 3/1/99 <br /> Total Purgeable Hydrocarbons(C6-C12) and BTEX 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 /> I.CS(contin�ued) 90201_ 87-BSI <br /> Ethylbenzene 2/16/99 0.200 0.183 mg/kg 70.0-130 91.5 <br /> Xylenes(total) 0.600 0.559 1. 70.0-130 93.2 <br /> Surrogate: a,a,a-Trifluorotoluene 0.200 0.183 60.0-140 91.5 <br /> Matrix Spike 9020187-MSI S902_ 174-03 <br /> Benzene 2/16/99 0.200 ND 0.160 /k <br /> Toluene �� mg/kg g 60.0-140 80.0 <br /> 0.200 ND 0.166 60.0-140 83.0 <br /> Ethylbenzene 0.200 ND 0.170 " <br /> Xylenes(total) 0.600 ND 0.511 60.0-140 85.060.0-140 85.2 <br /> Surrogate: a,a,a-Triuorotoluene 0.200 0.180 60.0-140 90.0 <br /> Matrix Spike Dun 902018_ 7-MSD1 S902174-03 <br /> Benzene 2/16/99 0.200 ND /k 0.158 mg/kg g 60.0-140 79.0 25.0 1.26 <br /> . . <br /> 0.200 ND 0.164 600-140 820 25.0 1.21 <br /> Ethylbenzene 0.200 ND 0.167 60.0-140 83.5 25.0 1.78 <br /> Xylenes(total) 0.600 ND 0.501 60.0-140 83.5 25.0 2.02 <br /> Surrogate. a,a,a-Trifluorotoluene 0.200 0.182 60.0-140 91.0 <br />,'equoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br />.onald W. Bobel,Client Services Represents ive <br /> Page 12 of 15 <br />