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J <br /> Sequoia 819 Striker Avenue,Suite 8 <br /> Sacramento,CA 95834 <br /> (916)921.9600 <br /> 1%0- Analytical FAX(916)921-0100 <br /> SECOR International Project: ARCO 434,Lodi,CA Sampled: 6/16/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 6/18/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 7/6/99 <br /> Total Purgeable Hydrocarbons(C6-C12),BTEX and MTBE by DHS LUFI'/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: 9060414 Date Prepared: 6/28199 Extraction Method: EPA 5030B(MeOH) <br /> Blank 9060414-BLKI <br /> Purgeable Hydrocarbons 6/28/99 ND mg/kg 1.00 <br /> Benzene ND 0.00500 <br /> Toluene ND 0.00500 <br /> Ethylbenzene ND 0.00500 <br /> Xylenes(total) ND 0.00500 <br /> Methyl tert-butyl ether ND 0.0500 <br /> Surrogate. a,a,a-Triiluorotoluene 0.100 0.193 60.0-140 96.5 <br /> LCS 9060414-BSI <br /> Benzene 6128/99 0.200 0.218 mg/kg 70.0-130 109 <br /> Toluene 0.200 0.237 70.0-130 118 <br /> Ethylbenzene 0.200 0.236 70.0-130 118 <br /> Xylenes(total) 0.600 0.632 70.0-130 105 <br /> Methyl cert-butyl ether 0.200 0.215 70.0-130 108 <br /> Surrogate: a,a,a-Tris luorotoluene 0.100 0.195 60.0-140 97.5 <br /> Matrix 9060414-MS1 S906336-01 <br /> Benzene 6/28/99 0.200 ND 0.188 mg/kg 60.0-140 94.0 <br /> Toluene 0.200 ND 0.201 60.0-140 101 <br /> Ethylbenzene 0.200 ND 0.201 60.0-140 101 <br /> Xylenes(total) 0.600 ND 0.554 60.0-140 923 <br /> Methyl tert-butyl ether 0.200 ND 0.185 60.0-140 92.5 <br /> Surrogate: a,a.a-Triuorotoluene 0.100 0.174 60.0-140 87.0 <br /> Matrix Spike Duo 9060414-MSDI 5906336-01 <br /> Benzene 6/28/99 0.200 ND 0.192 mg/kg 60.0-140 96.0 25.0 2.11 <br /> Toluene 0.200 ND 0.205 60.0-140 102 25.0 0.985 <br /> Ethylbenzene 0.200 ND 0.205 60.0-140 102 25.0 0.985 <br /> Xylenes(total) 0.600 ND 0.559 60.0-140 93.2 25.0 0.970 <br /> Methyl tert-butyl ether 0.200 ND 0.196 60.0-140 98.0 25.0 5.77 <br /> Surrogate: a,a,a-Tris luorotoluene 0.100 0.174 60.0-140 87.0 <br /> Sequoia Analytical-Sacramento 'Refer to end ofreport jar text ofnotes and definitions. <br /> Page 6 of 8 <br />