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Sequoia 680 Chesapeake[hive Redwood City CA 94063 (650)364-9600 FAX(650)364-9'33 <br /> 404 N Wiget lane Walnut Creek CA 94598 <br /> (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Sulte 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 /> • <br /> SECOR International Project ARCO 2093,Tracy,CA Sampled 3117/99 <br /> 9912 Business Park Drive,Ste 100 Project Number 7G600-604-01 Received 3118199 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 4/l/99 <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 Recov RPD RPD <br /> lAnalyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> LCS(continiLeA) 9030329-BSI <br /> Methyl Cert-butyl ether 3125/99 100 109 ug/l 700-130 109 <br /> Surrogate a,a a-Trnfluorotoluene 100 958 600-140 958 <br /> Matrix Spike 9030329-MSI 5903266-10 <br /> Benzene 3/25199 100 ND 857 ug/l 600-140 857 <br /> Toluene 100 ND 867 600-140 867 <br /> Ethylbenzene 100 ND 8 79 600-140 879 <br /> Xylenes(total) 300 ND 265 600-140 88 3 <br /> Methyl ter[-butyl ether 100 ND 143 600-140 143 2 <br /> Surrogate a a a-Trrfluorotoluene 100 9 12 600-140 912 <br /> Matrix Spike Dqn 9030329-MSD1 S903Z 6-14 <br /> Benzene 3/25/99 loo ND 8 83 ug/l 600-140 883 250 299 <br /> luene 100 ND 870 600-140 87 0 250 0 345 <br /> hylbenzcnc I0 0 ND 8 80 600-140 880 250 0 114 <br /> Xylenes(total) 300 ND 263 600-140 877 25 0 0 682 <br /> Methyl tert-butyl ether t 0 0 ND 152 600-140 152 25 0 6 10 2 <br /> Surrogate a a a-Trtfluorotoluene 100 961 60 0 140 961 <br /> Batch, 2Q30340 Date Crepared. 3/26t22 Extractioll Method. EPA 503913(P/T) <br /> Blank 9030340-BI.M I <br /> Purgeable Hydrocarbons 3/25/99 ND ug/1 Soo <br /> Benzene ND 0 500 <br /> Toluene ND 0 500 <br /> Ethylbenzene ND 0 500 <br /> Xylenes(total) ND 0 500 <br /> Methyl tert-butyl ether " ND " 500 <br /> Surrogate a a a-Trtfluorotoluene 100 100 600-140 100 <br /> IS-IS 2030340-RS11 <br /> Benzene 3/25/99 100 8 50 ug/l 700-130 85 0 <br /> Toluene 100 8 74 700-130 874 <br /> Ethylbenzene too 861 700-130 86 1 <br /> Xylenes(total) 300 25 8 700-130 860 <br /> Methyl tert-butyl ether too 107 700-130 107 <br /> Surrogate a a a-Trifluorotoluene 100 949 600-140 94 9 <br /> Matrix Spike 2030.340-Mgl S903265-02 <br /> Benzene 3/25/99 100 ND 949 ug/l 600-140 949 <br /> Toluene 100 ND 9 38 600-140 93 8 <br /> #e,q­u`o7 <br /> ylbenzene 1 0 0 ND 9 18 600-140 91 8 <br /> Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Sandra R Hanson,Client Services Representative Page 7 of 9 <br />