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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 Creels 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 /> Analytical1455 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 /> 0 <br /> Sequoia Analytical-San Carlos Project N/A Sampled 4/14/99 <br /> 1551 Industrial Blvd Project Number (WO#1-904195) Received 4/20/99 <br /> San Carlos, CA 94070 Project Manager Mike Gregory _ Reported 4/30/99 <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 /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Blank{c!2ntlaugo 9040248-BLKl <br /> Surrogate a a a-Trifluorotoluene 4/21/99 100 995 u9/1 600-140 995 <br /> LES 9040248-BS1 <br /> Benzene 4/21199 100 9 93 ug/l 700-130 993 <br /> Toluene 10 0 100 700-130 100 <br /> Ethylbenzene 100 990 700-130 99 0 <br /> Xylenes(total) 300 300 700-130 100 <br /> Methyl tert-butyl ether 100 11 2 700-130 112 <br /> Surrogate a a a-Trtfluorotoluene 100 100 600-140 100 <br /> matrig Spike 9040248-MS1 S904259-Q6 <br /> Benzene 4121/99 10 0 ND 101 ug/l 600-140 101 <br /> Toluene 100 ND 103 600-140 103 <br /> Iftbenzene " 10 0 ND 100 ji 600-140 100 <br /> Wes(total) 300 ND 30 l 600-140 100 <br /> Methyl tert-butyl ether too ND 143 600-140 143 l <br /> Surrogate a a a-Trifluorotoluene 10 0 102 600-140 102 <br /> Matrix Spike Dup X4024$ MSM 5904259-06 <br /> Benzene 4/21/99 100 ND 105 ugIl 600-140 105 25 0 3 88 <br /> Toluene 10 0 ND 1 0 7 600-140 107 25 0 3 81 <br /> Ethylbenzene 100 ND 103 600-140 103 250 296 <br /> Xylenes(total) 300 ND 31 4 600-140 105 25 0 488 <br /> Methyl tent-butyl ether 100 ND 14 4 600-140 144 25 0 0 697 1 <br /> Surrogate a a a-Trtfluorotoluene 100 105 600-140 105 <br /> Sequoia Analytical- Sacramento *Refer to end of repo t far tert of notes and definitions <br />��1 12 47-W�3 <br /> Sandra R Hanson, Client Services Representative Page 7 of 10 <br />