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680 Chesapeake Drive Redwood Clty,CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N.Wi$et 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)9Z1-0100 <br /> Blv <br /> 954 (707)792- 865 FAX(707) 792-0342 <br /> Analytical 1555 IndDorial Rooadd. North,Ste. D San(Carlos,CA Petauma.CA94070-41 11 (650)232-19600 FAX(6 0)232-9612 <br /> SECOR International Project: ARCO 4493, Stockton,CA Sampled: 4/13/99 <br /> 9912 Business Park Drive, Ste. 100 Project Number: N/A Received- 4/14/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 4119199 <br /> Total Purgeable Hydrocarbons (C&C12),BTEX and MTBE by DHS LUFT <br /> Sequoia Analytical-Sacramento <br /> Batch Date Date Surrogate Reporting <br /> Analyte Number Pre ared Analyzed Limits Limit Result Units Notes* <br /> STP-2(comPgsite 5904201-01 S" <br /> Purgeable Hydrocarbons 9040169 4115/99 4115199 1.00 7.06 mg/kg I <br /> Benzene 0.00500 ND " <br /> Toluene 0.00500 0.0118 " <br /> Ethylbenzene 0.00500 0.152 " <br /> Xylenes(total) 0.00500 0.191 " <br /> Methyl tert-butyl ether 0.0500 ND " <br /> Surrogate: a.a,a-Triuorotoluene 60.0-140 98.5 % <br /> WO-1 (cow on site) S904201-02 SAW <br /> Purgeable Hydrocarbons 9040169 4/15/99 4/15/99 1.00 ND mg/kg <br /> Benzene 0.00500 ND " <br /> Toluene 0.00500 ND " <br /> Ethylbenzene 0.00500 ND " <br /> lenes(total) 0.00500 ND " <br /> W,hyl tert-butyl ether 0.0500 ND " <br /> urrogale: a,a,a-Triuorololuene 60.0-140 100 % <br /> STP-3(composite) S904201-03 S" <br /> Purgeable Hydrocarbons 9040169 4/15199 4/15/99 20.0 216 mg/kg 2,D <br /> Benzene 0.100 ND D <br /> Toluene 0.100 ND D <br /> Ethylbenzene 0.100 0.856 D <br /> Xylenes(total) 0.100 0.877 D <br /> Methyl tert-butyl ether 1.00 ND D <br /> Surrogate: a,a,a-Trifluorotoluene 60.0-140 99.5 % <br /> STP-4(composite) S904201-04 Sail <br /> Purgeable Hydrocarbons 9040169 4/15/99 4/15/99 5.00 38.5 mg/kg 2,D <br /> Benzene 0.0250 0.0692 D <br /> Toluene 0.0250 0.0712 D <br /> Ethylbenzene 0.0250 0.293 D <br /> Xylenes(total) 0.0250 1.43 D <br /> Methyl tert-butyl ether 0.250 ND D <br /> Surrogate: a,a,a-Trifluorotoluene 60.0-140 101 <br /> i <br /> quota Aalyti,,l -Sacramento *Refer to end of report for text of notes and definitions, <br /> andra R. Hanson, Client Services Representative page 2 of 12 <br />