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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364-9233 <br /> 404 N Wlget lane Walnut Creek CA 94598 (925)988 9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)9z 10100 <br /> 455 McDowell Blvd North Ste D Petaluma CA 94954 (707) 792 1865 FAX(707)792-0342 <br /> Analytical 1551 Industrial Road San Carlos CA 94070 41 l 1 (650)232-9600 FAX(650)232 9612 <br /> Sequoia Analytical-San Carlos Project N/A Sampled 4/14/99 <br /> 1551 Industrial Blvd Project Number (WO#1-904198) Received 4120199 <br /> San Carlos,CA 94070 Project Manager Mike Gregory Reported 4130/99 <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 /> Batch, 9040288 Date Prepared. 4/23/99 Extraction Method, EPA 5030B(P/T) <br /> Blank 2040288-BLKI <br /> Purgeable hydrocarbons 4/23/99 ND ug/l 500 <br /> Benzene ND 0 500 <br /> Toluene ND 0 500 <br /> Ethylbenzene ND 0 500 <br /> Xylenes(total) ND 0 500 <br /> Surrogate a,a a-Tri luorotoluene !0 0 9 27if 600-140 92 7 <br /> LES 9040288-BSI <br /> Benzene 4/23/99 100 104 ug/1 700-130 104 <br /> Toluene 100 105 700-130 105 <br /> Ethylbenzene 100 103 700-130 103 <br /> Xylenes(total) 300 31 1 700-130 104 <br /> Surrogate a a a-Trifluorotoluene 100 998 600-140 998 <br /> Matrix Spike 9040288-MSI 5904264-01 <br /> Benzene 4/23/99 100 ND 11 1 ug/l 600-140 111 <br /> Toluene 10 0 ND 104 600-140 104 <br /> Ethylbenzene 100 ND 10 5 600-140 105 <br /> Xylenes(total) 300 ND 31 9 600-140 106 <br /> Surrogate a,a a-Trifluorotoluene 10 0 10 2 600-140 102 <br /> Matrix Spike nun 9040288-MSD1 S904264-01 <br /> Benzene 4/23/99 100 ND 9 86 ugll 600-140 98 6 25 0 11 8 <br /> Toluene 100 ND 102 600-140 102 25 0 194 <br /> Ethylbenzene 10 0 ND 102 600-140 102 25 0 290 <br /> Xylenes(total) 300 ND 31 3 600-140 104 25 0 1 90 <br /> Surrogate a a a-Trifluorotoluene 100 101 600-140 101 <br /> Batch. 9040303 Date Prepargd 4/26/99 Extraction Method. EPA 503QB(P/T) <br /> IBank 9040303-BLKI <br /> Purgeable Hydrocarbons 4/26/99 ND ug/l 500 <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-Trrfluorotoluene !0 0 832 600-140 83 2 <br /> LCCS 9040303-BSI <br /> Benzene 4/26/99 10 0 8 74 ug/l 700-130 874 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitro <br /> Sandra R anson, lent Services Representative page 4 of 7 <br />