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680 Chesapeake Drive Redwood CI CA 94063 <br /> Sequoia p ri {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 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)79Z-1865 FAX(707)792-0342 <br /> 1551 Industrial Road San Carlos,CA 94070-4111 (650)232-9600 FAX (650)232 9612 <br />` Sequoia-Redwood City Project Kayvan Kimyat Sampled 4/22/99 <br /> 680 Chesapeake Drive Project Number 9904938(ATC_1) Received 4/23/99 <br /> Redwood City,CA 94063 Project Manager Kayvan Kimyai Reported 5/3/99 <br /> Total Piirgeable Hydracarivns(Cfr-C12)ailad BTEX bk DHS LUFT/Quality CotitroI <br /> Sequo>+a Analytical San Carlos <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch 9040137 Date Prepared 4/28/99 Extraction Method EPA 5030B lP/T1 <br /> Blank 9040137-BLKI <br /> Purgeable Hydrocarbons as Gasoline 4/28/99 ND ug/l 50 0 <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-Tnfluorotoluene 100 8 89 600-140 889 <br /> LCS 9040137-BSI <br /> i <br /> Benzene 4/28/99 100 100 ug/l 700-130 100 <br /> Toluene 100 101 " 700-130 101 <br /> Ethylbenzene 100 10 8 700-130 108 <br /> Xylenes(total) 300 298 700-130 993 <br /> Wte a,a,a-Tnfluorotoluene 100 910 600-140 910 <br /> Matnx Spike 9040137-MS1 L904303-07 <br /> Benzene 4/28/99 100 6 80 148 ug/l 600-140 800 <br /> Toluene 100 16 6 23 3 600-140 67 0 <br /> Ethylbenzene 100 3 68 12 9 600-140 922 <br /> Xylenes(total) it 300 17 5 421 600-140 82 0 <br /> Surrogate a,a,a-Tnfluorotoluene 0 100 838 600-140 738 <br /> Matrix S ike Dup 9040137-MSDI L904303-07 <br /> Benzene 4128199 100 6 80 16 9 ug/l 600-140 101 25 0 23 2 <br /> Toluene 100 16 6 261 600-140 95 0 25 0 346 <br /> Ethylbenzene 100 3 68 148 600-140 ill 25 0 185 <br /> Xylenes(total) 300 175 480 600-140 102 25 0 21.7 <br />'Surrogate aa a-Tnfluorotoluene 100 907 600-140 90 7 <br /> Batch 9040145 Date Prepared 4129/99 Extraction Method EPA 5030E lP/Tl <br /> Blank 9040145-BLKI <br />'Purgeable Hydrocarbons as Gasoline 4/29/99 ND ug/l 50 0 <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-Trifluorotoluene 100 10 9 600-140 109 <br /> LCS 9040145-BS1 <br /> Purgeable Hydrocarbons as Gasoline 4/29/99 250 223 ug/l 70 0430 892 <br /> agate a,a,a-Trifluorotoluene 100 181 600-140 181 2 <br /> Sequoia Analytical-San Carlos *Refer to end of report for text of nates and definitions <br /> Page 7 of 10 <br />