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Sequoia 819 Striker Avenue Suite 8 <br /> Sacramento, CA 95834 <br /> (916) 921-9600 <br /> Analytical <br /> FAX(916)921-0 100 <br /> EMCON/IT-Sacramento Project ARCO 548,Stockton,CA Sampled 12/I3/99 <br /> 1433N Market Blvd,#1 Project Number 792202 Received 12/14/99 <br /> Sacramento,CA 95834 Project Manager Dave Foley Reported 12/21/99 <br /> Total Purgeable Hydrocarbons (C6-C12),BTEX atfd MTBE by DHS Lt7FT/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 9120216 Date Prepared 12/17/99 Extraction Method EPA 5030B(MeOH) <br /> Blank 9120216-BLKI <br /> Purgeable Hydrocarbons 12/17/99 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 tent-butyl ether ND 250 <br /> Surrogate a ax-Trifluorotoluene 100 9 15 600-140 915 <br /> LCS 9120216-BSI <br /> Benzene 12/17/99 100 9 10 ug/l 700-130 910 <br /> Toluene too 930 700-130 930 <br /> Ethylbenzene 100 936 700-130 93 6 <br /> Xylenes(total) 300 283 700-130 943 <br /> y]tert-butyl ether " 100 9 63 700-130 963 <br /> Lmwgaro a,a a-Trrfluorotoluene 100 8 93 600-140 893 <br /> _Matrix Spike 9120216-MSI S912165-03 <br /> Benzene 12/17/99 100 ND 909 uefl 600-140 909 <br /> Toluene 100 ND 929 " 600-140 929 <br /> Ethylbenzene 100 ND 929 IF 600-140 929 <br /> Xylenes(total) 300 ND 28 1 600-140 937 <br /> Methyl tert-butyl ether 100 ND 924 " 600-140 924 _ <br /> .Surrogate a aa-Tr fluorotoluene 100 896 600-140 896 <br /> Matrix Spike My 9120216-MSD1 S912165-03 <br /> Benzene 12/17/99 too ND 9 25 ug/l 60 0440 92 5 250 174 <br /> Toluene " too ND 944 600-140 944 25 0 160 <br /> Ethylbenzene 100 ND 946 600-140 946 25 0 181 <br /> Xylenes(total) IF <br /> 300 ND 286 600-140 953 25 0 169 <br /> Methyl tert-butyl ether it 100 ND 9 62 600-140 962 250 4 03 <br /> Surrogate a,a,a-Trifluorotoluene IF <br /> 100 905 11600-140 905 <br /> AML <br /> a Analytical-Sacramento *Refer to end ofreport for text of notes and definitions <br /> Page 4 of 5 <br />