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(40 Jarvis Drive <br /> Morgan�/ �� Hill,CA 95037 <br /> iSequoia (4�)776-9600 <br /> FAX(408)782-6308 <br /> qWF Analytical www.se9a°talabs.rAm <br /> URS Corporation Rl Project: ARCO#434 ML10617 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#434 Reported: <br /> Sacramento CA,95833 Project Manager: Vem Elarth 11/19/02 05:43 <br /> BTEX by DHS LUFT - Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2100343-EPA 5030B(P/T) <br /> Blank(2100343-BLKI) Prepared: 10/23/02 Analyzed: 10/24/02 <br /> Benzene ND 0.0050 mg/kg <br /> Toluene ND 0.0050 " <br /> Ethylbenzene ND 0.0050 " <br /> Xylenes(total) ND 0.0050 " <br /> Surrogate:a,a,a-Triuorotoluene 0.0210 0.0200 105 60-140 <br /> Laboratory Control Sample(2100343-BSI-) Prepared&Analyzed: 10/23_/0.2__ _ <br /> Benzene 0.0157 0.0050 mg/kg 70-130 <br /> Toluene 0.0178 0.0050 70-130 <br /> Ethylbenzene 0.0185 0.0050 70-130 <br /> Xylenes(total) 0.0580 0.0050 70-130 <br /> Surrogate:a,a,a-Triluorotoluene 0.0182 0.0200 91 60-140 <br /> Matrix Spike(2100343-MS1) Source:MLJ0617-03 Prepared&Analyzed: 10/23/0_2_ <br /> Benzene 0.0174 0.0050 mgtkg ND 60-140 <br /> Toluene 0.0842 0.0050 ND 60-140 <br /> Ethylbenzene 0.0227 0.0050 ND 60-140 <br /> Xylenes(total) 0.130 0.0050 ND 60-140 <br /> Surrogate:a,a,a-Tri luorotoluene 0.0222 0.0200 Ill 60-140 <br /> Matrix Spike Dup(2100343-MSDI) Source:MLJ0617-03 Prepared&Analyzed: 10/23/02 <br /> Benzene 0.0171 0.0050 mgtkg ND 60-140 2 25 <br /> Toluene 0.0834 0.0050 " ND 60-140 1 25 <br /> Ethylbenzene 0.0225 0.0050 ND 60-140 0.9 25 <br /> Xylenes(total) 0.129 0.0050 ND 60-140 0.8 25 <br /> Surrogate:a,a,a-Trj7uorotoluene 0.0222 0.0200 1/1 60-140 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. This analytical report must be reproduced in its entirety. <br /> 9 of 12 <br />