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1 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> ® Sequoia 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)792 1865 FAX(707) 792-0342 <br /> 1551 Industrial Road San Carlos CA 94070 41 1 1 (650)232 9600 FAX(650)232 9612 <br /> EMCON-Sac Project ARCO 2130,Stockton,CA Sampled 3/31199 <br /> 1433 N Market Blvd Project Number 2 1775-229 004 Received 411/99 <br /> Sacramento CA 95834 Pr0JCct 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 /> Batch, 9040131fttpared. 4112192 Datg Extraction,._ ethod EPA 5030B,(pQ) <br /> Man k 2040133-131,KI <br /> Purgeable Hydrocarbons 4/12/99 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 Soo <br /> Surrogate a a a Trluorotoluene 100 976 600-140 976 <br /> ICS 9040133-, 1 <br /> Benzene 4/12/99 100 8 87 ug/I 700-130 88 7 <br /> Toluene 100 906 700-130 906 <br /> Ethylbenzene 10 0 889 700-130 88 9 <br /> X lenes(total) 300 27 1 700-130 903 <br /> f ten-butyl ether 100 10 3 700-130 103 <br /> M99-01—e -a a-Trifluorotoluene 100 836 600-140 83 6 <br /> 11'Iatrix r_.Sotke 21240133_MS1 S904028-03 <br /> Benzene 4/12/99 100 ND 9 93 ug/1 600-140 993 <br /> Toluene 10 0 ND 10 0 600-140 100 <br /> Ethylbenzene 100 ND 990 600-140 990 <br /> Xylenes(total) 300 ND 299 600-140 997 <br /> Methyl tert-butyl ether 10 0 ND 11 1 600-140 ill <br /> Surrogate a a a-Trifluorotoluene 100 9 72 600-140 971 <br /> Matrix Spiky ,n 9040133-1VIAOI S904028-03 <br /> Benzene 4/12/99 100 ND f01 ug/l 600-140 101 250 170 <br /> Toluene 100 ND 101 600-140 101 25 0 0 995 <br /> Ethylbenzene 10 0 ND 10 1 600-140 101 250 200 <br /> Xylenes(total) 300 ND 304 600-140 101 25 0 130 <br /> Methyl tert-butyl ether 100 ND 11 l 600-140 111 25 0 0 <br /> Surrogate a a a Trtfluorololuene 10 0 9 75 600-140 975 <br /> Batch 9040157 D-aILP=ared. 4/13/99 Extraction Melhod EPA 5()30B(V/T) <br /> Blank 9040157-111Lf1 <br /> Purgeable Hydrocarbons 4/13/99 ND ug/1 500 <br /> Benzene ND <br /> Toluene ND 0500 <br /> 500 <br /> Ethylbenzene ND " <br /> \,lenes(total) ND 0 500 Meth I Cert-butyl ether ND 0 500 <br /> Soo <br /> ScJWa Analytical-Sacramento �, *Refer to end of report for text ofnotes and definitions <br /> Ronald W 13obel,Client Services Reptc,sentatn e <br /> ' � Page 6 of 9 <br />