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Sequoia 8s9Morgan Hi6) ll,CA 95037 <br /> (408)08)85 J 77 776-9600600 <br /> FAX(408)782-6308 <br /> TAW Analytical www.sequoWabs.com <br /> URS Corporation [I l Project: ARCO#434 MLJ0673 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#434 Reported: <br /> Sacramento CA,95833 Project Manager: Vem Elarth 11/12/02 14:57 <br /> Total Purgeable Hydrocarbons (C6-C10) by EPA 8015B modified,BTEX by EPA 8021B - Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2J28013-EPA 5030B [P/TJ <br /> Blank(2J28013-BLKI) Prepared&Analyzed: 10/28/02 <br /> Gasoline Range Organics(C6-C10) ND 0.50 mg/kg <br /> Benzene ND 0.0050 " <br /> Toluene ND 0.0050 " <br /> Ethylbenzene ND 0.0050 " <br /> Xylenes(total) ND 0.010 " <br /> Surrogate:a,a,a-Trinuorotvluene 0.0186 0.0100 93.0 64-145 <br /> Laboratory Control Sample(2J28013-BS1) _ Prepared&Analyzed: 10/28/02 <br /> Gasoline Range Organics(C6-C10) 1.00 0.50 mgtkg 1.00 100 63-143 <br /> Surrogate:qqa-Triuorotoluene 0.0241 0.0200 120 64-145 <br /> Matrix Spike(2J28013-MSI) Source:MLJ0673-10 _ Prepared&Analyzed: 10/28/02 <br /> Gasoline Range Organics(C6-C10) 0.689 0.50 mgtkg 1.10 ND 62.6 63-143 QM-07 <br /> Benzene 0.0228 0.0050 " 0.0132 ND 173 72-135 QM-07 <br /> Toluene 0.105 0.0050 0.0794 ND 132 67-141 <br /> Ethylbenzene 0.0236 0.0050 0.0184 ND 128 68-147 <br /> Xylenes(total) 0.125 0.010 0.0922 ND 136 62-149 <br /> Surrogate:a,a,a-Triuorotoluene 0.0229 0.0200 114 64-145 <br /> Matrix Spike Dup(2J28013-MSDI) Source: MLJ0673-10 Prepared&Analyzed: 10/28/02 _ <br /> Gasoline Range Organics(C6-CIO) 0.836 0.50 mg/kg 1.10 ND 76.0 63-143 19.3 21 <br /> Benzene 0.0222 0.0050 It 0.0132 ND 168 72-135 2.67 35 QM-07 <br /> Toluene 0.0986 0.0050 0.0794 ND 124 67-141 6.29 18 <br /> Ethylbenzene 0.0222 0.0050 0.0184 ND 121 68-147 6.11 20 <br /> Xylenes(total) 0.123 0.010 0.0922 ND 133 62-149 1.61 20 <br /> Surrogate:a,a,a-Triuorotoluene 0.0238 0.0200 119 64-145 <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 entirely. <br /> 11 of 15 <br />