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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650)3649600 FAX(650)364-9733 <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-%73 <br /> 819 Striker Avenue.Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0 100 <br /> 455 McDowell Blvd. North,Ste.D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Analytical 11551 Industrial Road San Carlos,CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> • <br /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 4/13199 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 4/14/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 4/28199 <br /> Total Purgeable Hydrocarbons(C6-C12),BTEX and MTBE by DHS LUFTIQuaIity 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 ON Notes* <br /> Batch: 90.4QI78 Date Prepared: ,4116199 Extraction Method: EPA 5030B(MeOH) <br /> Blank 9040178-BLK1 <br /> Purgeable Hydrocarbons 4/16/99 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-Trifluorotoluene " 0.200 0.198 60.0-140 99.0 <br /> LC S 9040178-13S] <br /> Benzene 4116/99 0.200 0.206 mg/kg 70.0-130 103 <br /> Toluene 0.200 0.222 70.0-130 111 <br /> Ethylbenzene 0.200 0.223 70.0-130 112 <br /> AALlenes(total) 0.600 0.597 70.0-130 99.5 <br /> hyl tert-butyl ether 0.200 0.187 70.0-130 93.5 <br /> urrogale: a,a,a-Trifluorotoluene 0.200 0.202 60.0-140 101 <br /> Matrix Spike 9Q40178-MS1 S904203-04 <br /> Benzene 4/16199 0.200 ND 0.186 mglkg 60.0-140 93.0 <br /> Toluene 0.200 ND 0.201 60.0-140 101 <br /> Ethylbenzene 0.200 ND 0.199 60.0-140 99.5 <br /> Xylenes(total) 0.600 ND 0.545 60.0-140 90.8 <br /> Methyl tert-butyl ether 0.200 ND 0.180 60.0-140 90.0 <br /> Surrogate: a,a,a-Trifluorololuene 0.200 0.199 60.0-140 99.5 <br /> Matrix Spike nun 9040I78-MSDI 5904203-04 <br /> Benzene 4116199 0.200 ND 0.200 mg/kg 60.0-140 100 25.0 7.25 <br /> Toluene 0.200 ND 0.213 60.0-140 106 25.0 4.83 <br /> Ethylbenzene 0.200 ND 0.212 60.0-140 106 25.0 6.33 <br /> Xylenes(total) 0.600 ND 0.573 60.0-140 95.5 25.0 5.05 <br /> Methyl tert-butyl ether 0.200 ND 0.201 60.0-140 101 25.0 11.5 <br /> Surrogate: a,a,a-Triuorololuene 0.200 0.205 60.0-140 102 <br /> in <br /> --- - - - <br /> 19m <br /> uoia Analytical-Sacramento *Refer to end of report for text of notes and definilions. <br /> Sandra R. Hanson,Client Services Representative Page l 1 of 19 <br />