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Sequoia SBS Ids @Ne <br /> Morgan Hill,CA 95037 <br /> (D (408)7769600 <br /> FAX(408)782-6308 <br /> 11111 Analytical www.sequolalabs.com <br /> URS Corporation 1l l Project: ARCO#434 ML10673 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number. ARCO#434 Reported: <br /> Sacramento CA,95833 Project Manager: Vern 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 °/uREC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2328036-EPA 5035 <br /> Blank(2J28036-BLKI) Prepared&Analyzed: 10/28/02 <br /> Total Xylenes ND 0.50 ug/kg <br /> Benzene ND 0.50 <br /> tert-Butyl alcohol ND 20 0-10 <br /> Methyl tert-butyl ether ND 0.50 " <br /> Di-isopropyl ether ND 0.50 <br /> Ethyl tert-butyl ether ND 0.50 " <br /> tert-Amyl methyl ether ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Toluene ND 0.50 " <br /> Surrogate:1,2-Dichloroethane-d4 5.00 5.00 100 60-140 <br /> Surrogate:Dibromofluoromethane 5.05 5.00 101 60-140 <br /> Surrogate: 1,2-Dichloroethane-d4 5.00 5.00 100 60-140 <br /> Surrogate:Toluene-di? 4.00 5.00 80.0 60-140 <br /> Surrogate:4-Bromofluorobenzene 5.33 5.00 107 60-140 <br /> Laboratory Control Sample(2J28036-BSI) Prepared&Analyzed: 10/28/02 _ <br /> Benzene 9.86 0.50 ug/kg 10.0 98.6 60-140 <br /> Methyl tert-butyl ether 10.1 0.50 10.0 101 60-140 <br /> Toluene 9.09 0.50 10.0 90.9 60-140 <br /> Surrogate:1,2-Dichloroethaned4 4.94 5.00 98.8 60-140 <br /> Surrogate:Dibromofluoromethane 5.45 5.00 109 60-140 <br /> Surrogate:1,2-Dichloroelhaned4 4.94 5.00 98.8 60-140 <br /> Surrogate:Toluene-d8 4.19 5.00 83.8 60-140 <br /> Surrogate:4-Bromofluorobenzene 5.32 5.00 106 60-140 <br /> Laboratory Control Sample(2J28036-BS2) Prepared: 10/28/02 Analyzed: 10/29/02 <br /> Benzene 5.19 0.50 ug/kg 5.28 98.3 60-140 <br /> Methyl tert-butyl ether 9.38 0.50 8.40 112 60-140 <br /> Toluene 27.6 0.50 31.8 86.8 60-140 <br /> Surrogate:1,1-Dichloroethane-d4 5.00 5.00 100 60-140 <br /> Surrogate:Dibromofluoromethane 4.92 5.00 98.4 60-140 <br /> Surrogate:1,2-Dichloroethane-d4 5.00 5.00 100 60-140 <br /> Surrogate.:Toluene-d8 4.01 5.00 80.1 60-140 <br /> Surrogate.'4-Bromofluorobenzene 4.98 5.00 99.6 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 entirely. <br /> 13 of 15 <br />