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885 Jarvis Drive <br /> Sequoia Morgan HHI,CA95037 <br /> (408)776-9600 <br /> Analytical <br /> FAX(408)792-6308 <br /> www.sequoialabs.corr <br /> URS Corporation f 1l Project: ARCO#434 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO4434 Reported: <br /> Sacramento CA,95833 Project Manager: Vern Elarth 10/29/02 11:33 <br /> Total Purgeable Hydrocarbons 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/1) <br /> Blank(2100343-BLK1) Prepared&Analyzed: 10/23/02 <br /> Purgeable Hydrocarbons ND 0.50 mg/kg <br /> Surrogate:a,a.a-Tris luorotoluene 0.0165 0.0200 82 60-140 <br /> LCS(2100343-BS1) Prepared&Analyzed: 10/23/02 <br /> Purgeable Hydrocarbons 0.898 0.50 mg/kg 1.00 90 70-130 <br /> Surrogate:a,a,a-Triiluorotoluene 0.0234 0.0100 117 60-140 <br /> Matrix Spike(2100343-MSI) Source:MLJ0617-03 Prepared&Analyzed: 10/23/02 <br /> Purgeable Hydrocarbons 0.942 0.50 mg/kg 1.00 ND 94 60-140 <br /> Surrogate:a,a,a-Triiluorotoluene 0.0221 0.0100 /11 60-140 <br /> Matrix Spike Dup(2100343-MSDI) Source:MLJ0617-03 Prepared&Analyzed: 10/23/02 <br /> Purgeable Hydrocarbons 0.929 0.50 mg/kg 1.00 ND 93 60-140 1 25 <br /> Surrogate:a,a,a-Triiluorotoluene 0.0222 0.0200 111 60-140 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. This analytical report must be reproduced in its entirety. <br /> 7of11 <br />