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vftwe <br /> I�oe 885 Jarvis Dr <br /> Sequoia MapnHi0,CA95037 <br /> Analytical (408)776-9600 <br /> iW FAX(408)782-6308 <br /> f.. www.sequoialabs.ccm <br /> URS Corporation[11 Project: ARCO#434 MLJ0673 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#434 Reported: <br /> WM Sacramento CA,95833 Project Manager: Vern Elarth 11/12/02 10:24 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> �- Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result °/uREC Limits RPD Limit Notes <br /> Batch 2J28036-EPA 5035 <br /> Laboratory Control Sample(2J28036-BS2) Prepared: 10/28/02 Analyzed: 10/29/02 <br /> Surrogate:Toluene-d8 4.01 ug/kg 5.00 80.2 60-140 <br /> Surrogate:4-Bromofluorobenzene 4.98 5.00 99.6 60.140 <br /> Laboratory Control Sample Dup(2J28036-BSDI) Prepared&Analyzed: 10/28/02 <br /> Benzene 10.6 0.50 ug/kg 10.0 106 60-140 7.23 25 <br /> Methyl tert-butyl ether 12.2 0.50 10.0 122 60-140 18.8 11 QR-02 <br /> y„ Toluene 10.2 0.50 10.0 102 60-140 11.5 25 <br /> Surrogate:1,2-Dichloroethane-d4 5.13 5.00 103 60.140 <br /> Surrogate:Dibromofluoromethane 5.65 5.00 113 60.140 <br /> r <br /> Surrogate:1,2-Dichloroetharte-d4 5.13 5.00 103 60.140 <br /> Surrogate:Toluene-di? 4.41 5.00 88.1 60.140 <br /> Surrogate:4-Bromofluorobemene 4.85 5.00 97.0 60-140 <br /> aa. <br /> Matrix Spike(2J28036-MSI) Source:N LJO673-10 Prepared: 10/28/02 Analyzed: 10/29/02 <br /> Benzene 17.7 1.6 ug/kg 17.1 ND 104 60-140 <br /> Methyl tart-butyl ether 31.9 1.6 27.1 ND 118 60-140 <br /> Toluene 93.2 1.6 103 ND 90.5 60-140 <br /> Surrogate:1,2-Dichloroethane44 5.10 5.00 102 60-140 <br /> Surrogate:Dibromofluoromethane 4.94 5.00 98.8 60.140 <br /> Surrogate:1,2-Dichloroethane-d4 5./0 5.00 102 60-140 <br /> Surrogate:Toluene-di? 4.14 5.00 81.8 60./40 <br /> ti <br /> Surrogate:4-Bromofluorobenzene 4.82 5.00 96.4 60-/40 <br /> Matrix Spike Dup(2J28036-MSDI) Source:N LJ0673-10 Prepared: 10/28/02 Analyzed: 10/29/02 <br /> Bezrome 14.6 1.4 ug/kg 14.9 ND 98.0 60.140 19.2 25 <br /> Methyl ten-butyl ether 20.6 1.4 23.7 ND 86.9 60-140 43.0 25 QR-02 <br /> Toluene 80.3 1.4 89.7 ND 89.5 60-140 14.9 25 <br /> Surrogate:1,2-Dichloroethane-d4 4.82 5.00 96.4 60.140 <br /> Surrogate:Dibromofluoromethane 4.78 5.00 95.6 60-140 <br /> Surrogate:42-Dichloroethane-d4 4.82 5.00 96.4 60.140 <br /> Surrogate:Toluene-di? 4.32 5.00 86.4 60.140 <br /> Surrogate:4-Bromofluorobemene 5.54 5.00 111 60./40 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. Unless otherwise stated,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> 14 of 16 <br />