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�� tt <br /> 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 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921-o f 00 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707) 792 1865 FAX(707) 792-0342 <br /> 1551 Industrial Road San Carlos CA 94070 4 f I f (650)232 9600 FAX(650) 232 96 f 2 <br /> 9 <br /> EMCON-Sac Project ARCO 2130,Stockton,CA <br /> 1433 N Market Blvd Sampled 3/31/99 <br /> Project Number 21775-229 004 Received 4/1199 <br /> Sacramento,CA 95834 Project Manager Dave Foley Reported 4/15/99 <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 /> 2 40157,ULKI <br /> Surrogate a a a-Trrfluorotoluene 4/!3/99 10 0 100 ug/l 600-140 100 <br /> LICS 2040157-1$S1 41 <br /> Benzene 4/13/99 100 857 ug/I 700-130 $5 7 <br /> Toluene 100 8 76 70 0-130 876 <br /> Ethylbenzene 10 0 850 70 0-130 85 6 <br /> Xylenes(total) 300 263 700-130 877 <br /> Methyl tert-butyl ether 100 105 70 0-130 105 <br /> Surrogate a a a-Trifluorotoluene 10 0 769 60 0 140 76 9 <br /> M;ltm Snike 2490157-MSI S90402Q-07 <br /> Benzene 4/I3/99 100 1 11 <br /> Toluene 109 ug/l 60 0-140 979 <br /> 100 1 05 109 60 0-140 98 4 <br /> Ethylbcnzene 10 0 0 932 107 W <br /> 600-140 977 <br /> M (total) " 300 2 32 1 " <br /> tert-butyl ether 10 0 NDD [1 9 600-140 979 <br /> 119 <br /> Surrogate a a a-Trifluorotoluene 10 0 9 85 60 0_!40 98 S <br /> 2049157-MSnt 5904029-07 <br /> Benzene 4/13199 100 <br /> Toluene 1 11 9 83 ug/l 600-140 872 25 0 116 <br /> 10 0 1 06 990 60 0-140 88 4 25 0 10 7 <br /> Ethylbenzene 10 0 0 932 966 600-140 873 250 II 2 <br /> Xylenes(total) 300 273 294 60 0-140 88 9 25 0 9 64 <br /> Methyl tert-butyl ether 10 0 ND 126 600-140 126 25 0 5 7I <br /> Surrogate aaa-Trifluorotoluene 100 8 95 60 0 140 81 S <br /> peg Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> r � / <br /> onald ll' Bobel,Client Services Representative <br /> 101� Page 7 of 9 <br />