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819 <br /> Striker Avenue Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical FAX (916)921-0100 <br /> SECOR International-Sacramento Project ARCO 2133,Stockton,CA Sampled 12/16/99 <br /> 9912 Business Park Dr,Ste 100 Project Number NIA Received 12/17/99 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 1/4/00 <br /> Total Purgeable Hydrocarbons(C6-C12), BTEX and MTBE by DHS LUF /Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Lima Recov RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br />_Blank(continued) _ _ 9120272-BLK1 _— <br /> Surrogate a a a-Triuorotoluene 12122199 100 864 ug/1 600-140 864 <br /> LCS 9120272-BSI <br /> Benzene 12/22/99 10 0 880 ug/l 700-130 88 0 <br /> Toluene 10 0 895 700-130 895 <br /> Ethylbenzene 100 899 700-130 889 <br /> Xylenes(total) 300 250 700-130 83 3 <br /> Methyl tert-butyl ether _ 100 it 9 700-130 119 <br /> Surrogate a a,a-Trtfluorotoluene 100 894 600-140 894 <br /> Matrix Spike 9120272-NIS1 5912214-01 <br /> Benzene 12/22/99 10 0 ND 9 05 ug/l 600-140 905 <br /> Tol ne 10 0 ND 934 600-140 93 4 <br /> E zene 100 ND 9 35 600-140 93 5 <br /> Xy s(total) 300 ND 272 600-140 90 7 <br /> Methyl tert-butyl ether 100 ND 970 600-140 970 ---- <br /> Surrogate a a a-Tr fluorotoluene 100 867 600-140 867 <br /> Matrix Spike Dug 9120272-MSDI S912214-01 <br /> Benzene 12/22/99 10 0 ND 923 ug/l 600-140 <br /> 92 3 25 0 1 97 <br /> Toluene 10 0 ND 950 600-140 950 250 170 <br /> Ethylbenzene 100 ND 950 600-140 95 0 250 159 <br /> Xylenes(total) 300 ND 265 600-140 88 3 25 0 268 <br />_Methyl tert-butyl ether _ 100 ND It 1 600-140 111 250 --135--- <br /> Surrogate <br /> _135— -Surrogate a a,a-Trtfluorotoluene 100 869 650-140 869 <br /> Batch 9120289 Date Prepared 12/22/99 Extraction Method EPA 5030B McOH <br /> Blank 9120289-B LK 1 <br /> Purgeable Hydrocarbons 12/22/99 ND ug/I 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 /> Surrogate a a a-Trefluorotoluene 100 924 600-140 92 4 <br /> LCS 9120289-BSI <br /> Benzene 12/22/99 10 0 9 14 ug/l 700-130 91 4 <br /> Toluene 10 0 940 700-130 940 <br /> Ethylbenzene 100 924 700-130 924 <br /> X*(total) 300 28 l 70 0430 93 7 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Page 5 of 7 <br />