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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento CA 95834 <br /> 4 li) (9 t 6)921-9600 <br /> Analytical FAX(916)92 1-0 100 <br /> SECOR International Project ARCO 2133,Stockton CA Sampled 9/13199 <br /> 9412 Business Park Dr,Ste 100 Project Number 077 41844 008 Received 9/14/99 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 9/24/99 <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 % Notcs* <br /> Matrix Spike(continued) 9090242-NISI 5909173-10 <br /> Xylenes(total) 9/22/99 300 ND 290 ug/l 60 0-140 96 7 <br />_Methyl tert-butyl ether 100 ND10 5_ 600-140 105 <br /> Surrogate a a a-Tri luoroioluene 100 106 60 0-140 106 <br /> Matrix Spike Dup 9090242-MSD1 S909173-10 <br /> Benzene 9/22/99 100 ND 989 ug/I 60 0-i40 98 9 2S 0 0 101 <br /> Toluene 100 ND 973 600-140 973 25 0 0205 <br /> Ethylbenzene 100 ND 969 600-140 969 250 0206 <br /> Xylenes(total) 300 ND 289 600-140 963 25 0 0 415 <br /> Methyl tert-butyl ether 100 ND _ 11 3 _ 600-140 113 25 0 734 <br /> Surrogate a,a a-Trifluorotoluene <br /> 100 10 7 " 600-140 107 <br /> Batch. 909024.3 Date Prepared 9123/99 Extraction Method EPA 50308_(p/T) <br /> I 9090243-BLKI <br />-Tle Hydrocarbons 9123/99 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 " 5 00 <br /> Surrogate a a,a-Trifluorotoluene 100 921 600-140 92 1 <br /> LCS 9090243-BS1 <br /> Benzene 9123/99 100 835 ug/1 700-130 835 <br /> Toluene 100 866 70 0-130 86 6 <br /> Ethylbenzene 100 872 700-130 87 2 <br /> Xylenes(total) 300 262 700-130 873 <br />_Methyl tert-butyl ether 100 __ 109 700-130 109 <br /> Surrogate a,a a-Trtfluorotoluene 100 926 600-140 92 6 <br /> Matrix Spike 9090243-NISI 5909231-01 <br /> Benzene 9/23/99 100 ND 8 31 ugll 60 0-140 83 1 <br /> Toluene 100 ND 851 600-140 85 1 <br /> Ethylbenzene 100 ND 8 54 600-140 854 <br /> Xylenes(total) 300 ND 25 5 600-140 85 0 <br /> Methyl tert-butyl ether _ __ 100 __ _ ND 13_5 60 0-140 135 <br /> Surrogate a a a-Trifluorotoluene 100 8 82 600-140 882 <br /> Matrix Spike 9090243-MSD1 5909231-01 <br /> 8 47 ug/] GO 0-140 847 250 191 <br /> Benzene 9123/99 100 ND <br /> To a 100 ND 8 75 600-140 87 5 25 0 278 <br /> SeWia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Page 10 of 12 <br />