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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(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 /> 551 Industrial Road San Carlos CA 94070 41 1 l (650)232 9600 FAX(650)232 9612 <br /> SECOR International Project ARCO 2133,Stockton,CA Sampled 3124/99 <br /> 9912 Business Park Drive, Ste 100 Project Number 7G600-019-04 Received 3/24/99 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 3/25/99 <br /> Total Purgeable Hydrocarbons (C6-C12),BTEX and MTBE by DHS LUF1'IQuaItty 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 % Notes* <br /> Batch. 9030318 Date Prepared. 3/24199 Extraction Method. EPA 5030E(MeOH) <br /> Blank 9030318-BLKI <br /> Purgeable Hydrocarbons 3124/99 ND mg/kg 1 00 <br /> Benzene ND 000500 <br /> Toluene ND 000500 <br /> Ethylbenzene ND 000500 <br /> Xylenes(total) ND 000500 <br /> Methyl ter -butyl ether ND 00500 <br /> Surrogate a a a-Tr fluorotoluene 0200 0 195 600-140 975 <br /> LU 9030318-13S] <br /> Benzene <br /> Benzene 3/24/99 0200 0 212 mg/kg 700-130 106 <br /> Toluene 0200 0 224 700-130 112 <br /> Ethylbenzene 0200 0 224 700-130 112 <br /> enes(total) 0 600 0 611 700-130 102 <br /> lyE tert-butyl ether 0200 0 195 700-130 975 <br /> rrogate a a a-Trifluorotoluene 0200 0200 600-140 100 <br /> Matrix Spike 9030318-MSI 5903224-04 <br /> Benzene 3/24/99 0200 ND 0 182 mg/kg 600-140 91 0 <br /> Toluene 0200 ND 0 196 600-140 980 <br /> Ethylbenzene 0200 ND 0 196 600-140 98 0 <br /> Xylenes(total) 0 600 ND 0 541 600-140 902 <br /> Methyl tert-butyl ether 0200 ND 0 162 600-140 810 <br /> Surrogate a a a-Trifluorotoluene 0200 0208 600-140 104 <br /> Matrix Spike Duo 9030318-MSD1 S903224-04 <br /> Benzene 3/24/99 0200 ND 0 182 mg/kg 600-140 910 25 0 0 <br /> Toluene 0200 ND 0 197 600-140 98 5 25 0 0 509 <br /> Ethylbenzene 0200 ND 0 197 600-140 985 25 0 0 509 <br /> Xylenes(total) 0 600 ND 0 545 600-140 908 25 0 0 663 <br /> Methyl tert-butyl ether 0 200 ND 0 170 600-140 850 25 0 482 <br /> Surrogate a a a-Triuorotoluene 0200 0 212 600-140 106 <br /> In <br /> Wruola Analytical - Sacramento *Refer to end of report for test of notes and definitions <br /> Sandra R anson, Ched Services epresenta 1ve Page 3 of 4 <br />