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e qu o a 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364-9233 <br /> 404 N Wiget lane Walnut Creek CA 945% (925)988%00 FAX(925)988%73 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (9(6)921 9600 FAX(916)921-010o <br /> war Analytlea 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707) 792 1865 FAX(707)792-0342 <br /> 155t Industnal Road San Carlos CA 94070 41 1 1 (650) 232 9600 FAX(650)232 9612 <br /> SECOR International Project ARCO 2093,Tracy CA Sampled 5/20199 <br /> 9912 Business Park Drive Ste 100 Project Number N/A Received 5120199 <br /> Sacramento CA 95827 Protect Manager Rusty Benkosky Reported 614199 <br /> Total Purgeahle Hydrocarbons (C6-Cl2), BTEX and MTBE by DRS LUFF/Quality 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 /> Latch. 9050328 <br /> Plank � 9050328-BI,Kt <br /> Purgeable Hydrocarbons 5/21/99 ND mg/ml Air 10 0 <br /> Benzene <br /> ND 00500 <br /> Toluene ND 0 0500 <br /> Ethylbenzene ND 00500 <br /> Xylenes(to(al) ND 00500 <br /> Methyl Leri-butyl ether ND 0 500 <br /> Surrogate a a a Trifluorotoliiene 2 00 1 56 600 140 78 0 <br /> /ISS 905032 -BS l <br /> Benzene 5/21/99 200 1 81 mg/m'Air 700 130 90 <br /> Toluene 2 00 1 85 700-130 92 5 <br /> Ethylbenzene 200 1 91 700 130 95 5 <br /> nes(total) 600 5 61 700 130 93 5 <br /> ten-butyl ether 2 00 1 88 700-130 94 0 <br /> SqFale a a a Trrfluorololuene 2 00 1 58 60 0 140 79 0 <br /> LCS Dun 90SQ328-BSD1 <br /> Benzene 5/21199 200 1 81 mg/ml Air 700 130 905 25 0 0 <br /> Toluene 200 1 85 700-130 925 250 0 <br /> Ethylbenzene 200 1 90 700 130 95 0 25 0 0 525 <br /> Xylenes(total) 600 5 56 700-130 92 7 25 0 0 859 <br /> Methyl tert-butyl ether 200 1 62 700-130 81 0 25 0 14 9 <br /> Surrogate a a o-Trifduorotoluene 200 160 600-140 800 <br />§eW s tolyl^-l -Sacramento 'Refer io end of report for yeti of notes and defutmolo <br /> Sandra R Hanson Client Services Representative Page 4 of 6 <br />