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Sequoia 680 Chesapeake Drive Redwood CirS CA 94063 (650) 364 9600 FAX(650) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988 9600 FAX(92 5)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)792-3865 FAX(707)792 0342 <br /> SECOR International Project ARCO 2133,Stockton CA Sampled 9/10/98 <br /> 9912 Business Park Drive,Ste 100 Project Number Contract#22232 03 Received 9114198 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 9128/98 <br /> Total Purgeable Hydrocarbons(C6-02), BTEX and I%1TBF b) DHS LUFT/Quality Conti of <br /> Sequoia Analytical-Sacraniento <br /> Date Spike Sample QC Reporting Limit Reco. RPD RPD <br /> Analyte Analyzed Level Result Result units Recov Limits % Limit % Notes* <br /> B la n 1i(conttnttcm 8090205-B L K 1 <br /> Surrogate aaa-Trifluorololuene 9/21/98 too 9 79 11g/1 600-1-40 97 9 <br /> LC5 8090205-BSI <br /> Benzene 9/21/98 too 108 ug/I 700-130 108 <br /> Toluene 100 l0 1 700-130 101 <br /> Ethylbenzene too 9 93 700-130 993 <br /> Xylenes(total) 300 29 6 700-130 98 7 <br /> Methyl tcrt-butyl ether too 11 5 700-130 115 <br /> Sup i ogate aaa-Ti ifluol otohrene too 9 70 600 140 970 <br /> Matrix Spil.e 8090205-MSI S809227-03 <br /> Benzene 9/21/98 100 ND 106 ug/l 600-140 106 <br /> Toluene too ND 997 600-140 99 7 <br /> Ilbcnzene 100 ND 9 95 600-140 995 <br /> nes(total) 300 ND 29 7 600-140 990 <br /> Methyl tert-butyl ether 100 ND 110 600-140 110 <br /> Surrogate aaa-Ti drat otoluene 100 938 600-140 93 8 <br /> Matrix Spike Dun - S809227-03 <br /> Benzene 9/21198 too ND 106 ug/l 600-140 106 250 0 <br /> Toluene 100 ND 987 600-140 987 25 0 101 <br /> Ethylbenzene 100 ND 967 600-140 967 25 0 285 <br /> Xylenes(total) 300 ND 28 9 600-140 963 250 276 <br /> Methyl tcrt-butyl ether 100 ND 106 600-140 106 250 370 <br /> Surrogate a a a-Trlfluorololu ie too 931 60 0-140 93 1 <br /> Batch, 809023.4 Date Prepared Extraction 117etbod E (PCT) <br /> Ulank 8090234-BLKI <br /> Purgeable Hydrocarbons 9/22/98 ND ug/l 500 <br /> Benzene ND 0 500 <br /> Toluene PID 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-Tnfuorololuene 100 897 600-140 89 7 <br /> LI-CS 8090234-BS1 <br /> Benzene 9122198 100 103 ug/l 700-130 103 <br /> Toluene 100 9 53 700-130 95 3 <br /> Ethylbenzene too 9 28 700-130 928 <br /> ones(total) 300 278 700-130 92 7 <br /> Sequoia Analytical -Sacramento *Refe, to end of report for text of dales and def nitrons <br /> lnda C Sehneldet, Laboratory Director page 7 of 9 <br /> .x, <br />