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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921-0 100 <br /> IWAff Analytical 1551 McDowell Blvd San <br /> North Ste D alCarlos CA 94070-4111 (650)232-9600 FAX(650) Z32-9612 <br /> 0 <br /> Sequola Analytical-San Carlos Project N/A Sampled 4/14/99 <br /> 1551 Industrial Blvd Project Number (WO#L904198) Received 4/20199 <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 /> 09 <br /> RSI <br /> Toluene 4/26/ 939 <br /> 9 10 0 8 63 ug/I 700-130 863 <br /> Ethylbenzene 10 0 864 700-130 864 <br /> Xylenes(total) 300 260 700-130 86 7 <br /> Methyl tert-butyl ether 100 100 700-130 100 <br /> Surrogate a a a-Trifluorotoluene 1019 8 91 600-140 891 <br /> Matrix SplU QQ4_43Q3_MS1 W4263-01 <br /> Benzene 4/26/99 100 ND 8 89 ug/l 600-140 88 9 <br /> Toluene 100 ND 8 73 600-140 873 <br /> Ethylbenzene 10 0 ND 872 600-140 872 <br /> Xylenes(total) 300 ND 262 600-140 873 <br /> Methyl tert-butyl ether 10 0 ND 867 600-140 $67 <br /> Surrogate a s a-Tnfluorotoluene 10 0 881 600-140 881 <br /> AlMatritSpike Dun 5904261-01 <br /> enzene 4/26/99 100 ND 8 71 ug/1 600-140 871 25 0 205 <br /> Toluene 10 0 ND 847 600-140 84 7 25 0 3 02 <br /> Ethylbenzene 10 0 ND 860 600-140 860 25 0 1 39 <br /> Xylenes(total) 300 ND 259 600-140 $63 25 0 1 15 <br /> Methyl tert-butyl ether 100 ND 8 85 600-140 885 250 205 <br /> Surrogate a s a-Tnfluorotoluene 100 8 62 600-140 862 <br /> quoia Analytical -Sacramento *Refer to end of report for text of notes and definitions <br /> I N <br /> —Sandra R Hanson Client Services Representative Page 5 of 7 <br />