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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650) 3G4 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(9 16)921 0too <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 {707) 792 1865 FAX(707) 792-0342 <br /> 1551 Industnaf Road San Carlos CA 94070 41 1 1 (650) 232 9600 FAX(650) 232 9612 <br /> EMCON Sac Project ARCO 548,Stockton,CA Sampled 3/31/99 <br /> 1433 N Market Blvd Project Number 21775-206 004 Received 4/1199 <br /> Sacramento, CA 95834 Project Manager Dave Foley Reported 4/15/99 <br /> Total Purgeable Hydrocarbons(C6-Cl2),BTEX and MTBE by DHS LUFT/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Analyte ----------------------------- <br /> Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Blank(continued/ 9040132-BLK1 <br /> Surrogate a a a-Trtfluorotoluene 4/8/99 100 110 u9/1 600-140 110 <br /> LES 9040132-BS1 <br /> Benzene 4/8/99 100 941 ug/1 700-130 94 1 <br /> Toluene 100 950 700-130 950 <br /> Ethylbenzene 100 9-23 70 0-130 923 <br /> Xylenes(total) 300 282 700-130 940 <br /> Methyl tert-butyl ether 100 1 1 0 700-130 110 <br /> Surrogate a a a-Trifluorotoluene 100 909 600-140 90 9 <br /> Matrix Spike 9040132-MSI S904016-03 <br /> Benzene 4/8/99 100 ND I 1 0 ug/1 600-140 110 <br /> Toluene 100 ND 11 0 600-140 110 <br /> Etzene 100 ND 10 9 600-140 109 <br /> Xy,*"(total) 300 ND 33 0 600-140 0 110 <br /> Methyl tert-butyl ether 100 ND 12 9 600-140 129 <br /> Surrogate a a a-Trrfluorotoluene <br /> IOU 103 600-140 103 <br /> Matrix Spike Q1W 2040132-MSDI S904416-03 <br /> 33enzene 418/99 100 ND 13 5 ug/! 600-140 135 25 0 204 <br /> raluene 100 ND 11 1 600-140 111 250 0 905 <br />-thylbenzene 100 ND 196 600-140 196 25 0 570 2 <br /> Kylenes(total) 300 ND 522 600-140 174 25 0 451 2 <br /> vlethyl tert-butyl ether 100 ND 46 0 b0 0-140 NR 25 0 1I2 2 <br /> surrogate a a a-Tn,fluorotoluene /0 0 104 600-140 104 <br /> L110-- 2040156 r Prepared, 4/9/99 Extractign Method. EPA 503OR(PIT) <br /> I1ank 9040156_SLK1 <br />'urgeable Hydrocarbons 4/9/99 ND ug/l Soo <br /> lenzene ND 0 500 <br /> oluene „ <br /> ND 0 500 <br /> thylbenzene ND 0 500 <br /> xylenes(total) ND 0 500 <br /> 4ethyl tent-butyl ether ND 500 <br /> urrogate a a a-Truorotoluene 10 0 968 600-140 968 <br />� 904015fi-RS1 <br /> enzene 4/9/99 10 0 970 ug/I 700-130 970 <br /> oluene 100 969 700-130 96 9 <br /> thylbenzene 100 967 700-130 96 7 <br /> ylototal) 300 290 700-130 96 7 <br /> quota Analytical -Sacramento 111 *Refer to end of report for text of notes and defibwtorrs <br /> onald W Bobel, Client Services Representative pa 5 of- <br />