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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N.Wig,[Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd,North,Ste.D Petaluma.CA 94954 (707)792-1665 FAX(707)79Z-0342 <br /> SECOR International Project: ARCO 4493, Stockton,CA Sampled: 2/16/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number- N/A Received: 2117/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 313/99 <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 /> IAnalyte Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> Batch• 90ZO261 12-aILI!repared: 2/22/99 ExtractiQn Method; EPA 503013(Ra) <br /> Blank 9020261-BLKI <br /> Purgeable Hydrocarbons 2/22/99 ND ug/l 50.0 <br /> Benzene ND 0.500 <br /> Toluene ND 0.500 <br /> Ethylbenzene ND 0.500 <br /> Xylenes(total) ND 0.500 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 9.62 60.0-140 96.2 <br /> LCS 9QZ0261-BS1 <br /> Benzene 2/22/99 10.0 9.58 ug/l 70.0-130 95.8 <br /> Toluene 10.0 9.72 70.0-130 97.2 <br /> Ethylbenzene 10.0 9.51 70.0-130 95.1 <br /> Xylenes(total) 30.0 28.7 70.0-130 95.7 <br /> fgatea,a,a-Trifluorofoluene 10.0 9.79 60.0-140 97.9 <br /> 9020261-MSI 5902251-10 <br /> Benzene 2122/99 10.0 ND 9.64 ug/l 60.0-140 96.4 <br /> Toluene 10.0 ND 9.62 60.0-140 96.2 <br /> Ethylbenzene 10.0 ND 9.51 60.0-140 95.1 <br /> Xylenes(total) 30.0 ND 28.9 60.0-140 96.3 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 9.58 60.0-140 95.8 <br /> Matrix Spike Dun 9020261;.MSn1 5902251-10 <br /> Benzene 2/22/99 10.0 ND 9.63 ug/l 60.0-140 96.3 25.0 0.104 <br /> Toluene 10.0 ND 9.60 60.0-140 96.0 25.0 0.208 <br /> Ethylbenzene 10.0 ND 9.52 60.0-140 95.2 25.0 0.I05 <br /> Xylenes(total) 30.0 ND 28.8 60.0-140 96.0 25.0 0.312 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 9.90 60.0-140 99.0 <br /> -SUquoia Analytical -Sacramento *Refer to end of report for text ofnotes and definitions. <br /> Sandra R. Hanson,Client Services Representative Page 12 of 20 <br /> G� <br />