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680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(65n)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)Z32-9612 <br /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 3/10/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: 7G600-022-02 Received: 3111/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 3/22199 <br /> Total Purgeable Hydrocarbons(C6-C12),BTEX and MTBE by DHS LUFTIQuality Control <br /> Sequoia Analytical-Sacramento <br /> I <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov. Limits % Limit % Notes' <br /> Batch: 9030256 PakJ!repal:ed: 3/18/99 Extractmon Method. ERA 503013(MeOH.) <br /> Blank 9030256-BL K 1 <br /> Purgeable Hydrocarbons 3118/99 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 Cert-butyl ether ND 0.0500 <br /> Surrogate: a,a,a-Trifluorotoluene 0.200 0.215 60.0-140 108 <br /> LCS 9030256-BSI <br /> Benzene 3/18199 0.200 0.213 mg/kg 70.0-130 106 <br /> Toluene 0.200 0.225 70.0-130 112 <br /> Ethylbenzene 0.200 0.225 70.0-130 112 <br /> A"ienes(total) 0.600 0.612 70.0-130 102 <br /> yl tert-butyl ether 0.200 0.195 70.0-130 97.5 <br /> urrogate: a,a,a-Triuorotoluene 0.200 0.218 60.0-140 109 <br /> Matrix Spike 9030256-MS1 5903177-01 <br /> Benzene 3/18/99 0.200 ND 0.199 mglkg 60.0-140 99.5 <br /> Toluene 0.200 ND 0.206 60.0-140 103 <br /> Ethylbenzene 0.200 ND 0.219 60.0-140 109 <br /> Xylenes(total) 0.600 ND 0.599 60.0-140 99.8 <br /> Methyl tert-butyl ether 0.200 ND 0.188 60.0-140 94.0 <br /> Surrogate: a,a,a-Trifluorotoluene 0.200 0.208 60.0-140 104 <br /> Matrix Spike Dun 9030256-MSD1 5903177-01 <br /> Benzene 3/18/99 0.200 ND 0.202 mg/kg 60.0-140 101 25.0 1.50 <br /> Toluene 0.200 ND 0.220 60.0-140 110 25.0 6.57 <br /> Ethylbenzene 0.200 ND 0.223 60.0-140 112 25.0 2.71 <br /> Xylenes(total) 0.600 ND 0.609 60.0-140 102 25.0 2.18 <br /> Methyl tert-butyl ether 0.200 ND 0.192 60.0-140 96.0 25.0 2.11 <br /> Surrogate: a,a,a-Trifluorotoluene 0.200 0.205 60.0-140 102 <br /> 39Muota Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Sandra . Hanson,Client Services Representative Page 4 of 5 <br />