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680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 F NX(650)364-9233 <br /> Sequoia 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)921-0100 <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: 2124/99 to 2125/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 2/26199 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 3/5199 <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 Reeov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> Batch: 9030048 Date Prepared: 312/99 Extraction Method: EPA 50305(M1-01-11) <br /> Blauk 9030048-BLK1 <br /> Purgeable Hydrocarbons 3/2199 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 0.192 60.0-140 96.0 <br /> LCS 9030048-BSI <br /> Benzene 312199 0.200 0.194 mg/kg 70.0-130 97.0 <br /> Toluene 0.200 0.201 70.0-130 101 <br /> Ethylbenzene 0.200 0.202 70.0-130 101 <br /> enes(total) 0.600 0.604 70.0-130 101 <br /> hyl tert-butyl ether 0.200 0.190 70.0-130 95.0 <br /> Surrogate: a,a,a-Trfluorotoluene 0.200 0.193 60.0-140 96.5 <br /> Matrix Spike 9030048-MSI 5903011-13 <br /> Benzene 3/2199 0.200 ND 0.183 mg/kg 60.0-140 91.5 <br /> Toluene 0.200 ND 0.192 60.0-140 96.0 <br /> Ethylbenzene 0.200 ND 0.194 60.0-140 97.0 <br /> Xylenes(total) 0.600 ND 0.585 60.0-140 97.5 <br /> Methyl tert-butyl ether 0.200 ND 0.174 60.0-140 87.0 <br /> Surrogate: a,a,a-Trifluorotoluene 0.200 0.218 60.0-140 109 <br /> Matrix Spike Duo 9030048-MSD1 S903011-13 <br /> Benzene 312199 0.200 ND 0.183 mg/kg 60.0-140 91.5 25.0 0 <br /> Toluene 0.200 ND 0.181 60.0-140 90.5 25.0 5.90 <br /> Ethylbenzene 0.200 ND 0.192 60.0-140 96.0 25.0 1.04 <br /> Xylenes(total) 0.600 ND 0.579 60.0-140 96.5 25.0 1.03 <br /> Methyl Cert-butyl ether 0.200 ND 0.176 60.0-140 88.0 25.0 1.14 <br /> Surrogate: a,a,a-Trifluorotoluene 0.200 0.212 60.0-140 106 <br /> Batch: 9030049 Date Prepared: 312199 Extraction Method; EPA 5030B( eOR) <br /> Blank 9030049-BLKI <br /> Purgeable Hydrocarbons 3/2/99 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 /> thyl tert-butyl ether ND 0.0500 <br /> equoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Sandra R. Hanson,Client Services Representative Page IS of 21 <br />