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8Drive <br /> Morgan Hill,CA 95037Sequois (408)776-9600/ <br /> 1W Analytical FAX(408,792b308 <br /> www.s(408)782-6 08 <br /> URS Corporation I11 Project: ARCO#434 MLJ0673 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#434 Reported: <br /> Sacramento CA,95833 Project Manager: Venn Elarth 11/12/02 14:57 <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 %REC Limits RPD Limit Notes <br /> Batch 2J28036-EPA 5035 <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 122 0.50 10.0 122 60-140 18.8 11 QR-02 <br /> 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 /> Surrogate:1,2-Dichloroethane-d4 5.13 5.00 103 60-140 <br /> Surrogate:Toluene-a8 4.41 5.00 88.2 60-140 <br /> Surrogate:4-BromoJluorobemene 4.85 5.00 97.0 60-140 <br /> Matrix Spike(2J28036-MSI) _ _ _ Source:MLJ0673-10 Prepared: 10_/28/02 Analyzed: 10/29/0_2_ <br /> Benzene 17.7 1.6 ug/kg 17.1 ND 104 60-140 <br /> Methyl tert-butyl ether 31.9 L6 27.1 ND 118 60-140 <br /> Toluene 93.2 1.6 103 ND 90.5 60-140 <br /> Surrogate:1,1-Dichloroethaned4 5.10 5.00 102 60-140 <br /> Surrogate:Dibromofluoromethane 4.94 5.00 98.8 60-140 <br /> Surrogate:1,1-Dichloroethane-d4 5.10 5.00 102 60-140 <br /> Surrogate:Toluene-d8 4.14 5.00 82.8 60-140 <br /> Surrogate:4-Bromofluorobenzene 4.81 5.00 96.4 60-140 <br /> Matrix Spike Dup(2J28036-MSDI) Source:MLJ0673-10 Prepared: 10/28/02 Analyzed: 10/29/02 <br /> Benzene 14.6 1.4 ug/kg 14.9 ND 98.0 60-140 19.2 25 <br /> Methyl tert-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: 1,1-Dichloroethaned4 4.82 5.00 96.4 60-140 <br /> Surrogate.:Dibromofluoromethane 4.78 5.00 95.6 60-140 <br /> Surrogate:1,2-Dichloroethaned4 4.82 5.00 96.4 60-140 <br /> Surrogate:Toluene-& 4.32 5.00 86.4 60-140 <br /> Surrogate:4-Bromofluorobenzene 5.54 5.00 117 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 /> 14 of 15 <br />