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Sequoia 819 Striker Avenue Suite 8 -1 Sacramento CA X5834 ACVAn = (916) 921-9600 1-AX (9 16) 92 I-0 100 SECOR International Project ARCO 434,Lodi,CA Sampled 6118/99 9912 Business Park Drive,Ste 100 Project Number N/A Received 718199 Sacramento,-CA 95827 ----_ __- -_-Project Manager Rusty Benkosky=- - -- - ------Reported 7/19/99— Total /19/99—Total Purgeable Hydrocarbons(C6-C12),BTEX and MTBE by DHS LUFTIQualtty Control Sequoia Analytical-Sacramento Date Spike Sample QC Reporting Limit Recov RPD RPD Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* Batch. 9070134 Date Prepares/, 7112199 Extractwn Method. EPA 5030B(McOHI Blau 9070134-BI.KI Purgeable Hydrocarbons 7/12/99 ND mg/kg 100 Benzene ND 000500 Toluene ND 000500 Ethylbenzene ND 000500 Xylenes(total) ND 000500 Methyl cert-butyl ether ND 00500 Surrogate a s a-Trrfluorotoluene 0200 0 198 600-140 990 U-5 9070134-BSI Benzene 7/12/99 0200 0 217 mg/kg 700-130 108 Toluene 0200 0 234 700-130 117 Ethylbenzene 0200 0 232 700-130 116 Xylenes(total) 0 600 0 624 700-130 104 Methyl tent-butyl ether 0200 0 223 700-130 112 Surrogate a a a-Trifluorotoluene 0200 0201 600-140 101 MatrixSmke 9070134-NISI S907052-26 Benzene 7/12/99 0200 ND 0 196 mg/kg 600-140 980 Toluene 0200 ND 0 213 600-140 106 Ethylbenzene 0200 ND 0 218 600-140 109 Xylenes(total) 0 600 ND 0 592 600-140 987 Methyl tert-butyl ether 0200 ND 0 198 600-140 990 Surrogate a a a-Triuorotoluene 0200 0 196 600-140 98 0 Matrix Spike Dup 9010134-MSD1 S907052-26 Benzene 7/12199 0200 ND 0 193 mg/kg 600-140 965 250 1 54 Toluene 0200 ND 0 212 600-140 106 25 0 0 Ethylbenzene 0200 ND 0 217 600-140 108 25 0 0 922 Xylenes(total) 0 600 ND 0 578 600-140 963 250 246 Methyl tert-butyl ether 0200 ND 0 198 600-140 990 25 0 0 Surrogate a a,a-Trnfluorotoluene 0200 0 199 600-140 995 Sequoia AnalyticaE-Sacramento *Refer to end of report jar text of notes and definitions- Page 5 of 8