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Suite 8 <br /> Sequoia 819 Striker <br /> Sacramento <br /> 955mento CA 958344 <br /> (916)921-96pp <br /> Analytical www <br /> equ 921-0100 <br /> sequolalabs coin <br /> Gettler-Ryan-Dublin Project Chevron 9-6258,Stockton,CA Sampled 4124/00 <br /> 6747 Sierra Court,Ste J Project Number 386844 Received 4126/00 <br /> Dublin,CA 94568 Project Manager Deanna L Harding Reported 5110/00 <br /> Total Purgeable Hydrocarbons(C6-C12),BTEX and MTBE by DHS LUFTIQuality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Anal Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch 0050053 Date Prepared 5/3100 Extraction Method EPA 5030B(MeOHI <br /> Blank 0050053-BLKI <br /> Purgeable Hydrocarbons 5/3/00 ND ug/l 500 <br /> Benzene " ND It <br /> 0.500 <br /> Toluene " ND It <br /> 0.500 <br /> Ethylbenzene " ND It <br /> 0.500 <br /> Xylenes(total) ND It <br /> 0 500 <br /> Methyl tert-butyl ether ND It <br /> 2 50 <br /> Surrogate ",a-Trifluorotoluene 100 871 tr600-140 871 <br /> LCS 0050053-BSI <br /> Benzene 5/3/00 too 9 53 ug/l 70 0-130 953 <br /> Toluene 100 948 700-130 948 <br /> Ethylbenzene 100 9 53 700-130 953 <br /> Xylenes(total) 300 285 700-130 950 • <br /> Methyl tert-butyl ether " 100 910 700-130 910 <br /> Surrogate a,a,a-Trtfluorotoluene 100 867 600-140 867 <br /> Matrix Spike 0050053-MSI S004398-03 <br /> Benzene 513100 loo ND 100 ug/1 600-140 100 <br /> Toluene loo ND 977 600-140 97.7 <br /> Ethylbenzene " 100 ND 9 95 600-140 99.5 <br /> Xylenes(total) 300 ND 299 600-140 99.7 <br /> Methyl tert-butyl ether 100 ND 120 600-140 120 <br /> Surrogate a,a,a-Tr)?uorotoluene " 100 847 600-140 84 7 <br /> Matrix Spike Dup 0050053-MSDl 5004398-03 <br /> Benzene 513100 100 ND 9 88 ug/1 600-140 98.8 250 1.21 <br /> Toluene It 100 ND 9 89 600-140 989 250 1.22 <br /> Ethylbenzene too ND 9 82 600-140 98.2 250 1.32 <br /> Xylenes(total) 300 ND 293 600-140 97.7 250 2.03 <br /> Methyl tert-butyl ether 100 ND 888 600-140 88.8 250 299 1 <br /> Surrogate a,a,a-Trifluorotoluene 100 872 600-140 872 <br /> Batch 0050071 Date Prepared 514/00 Extraction Method: EPA 5030B(NeOH) <br /> Blank 0050071-BLKI <br /> Purgeable Hydrocarbons 514100 ND ug/1 50.0 <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 2 50 . <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Page 5 of 9 <br />