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Hi 8Jarvis Drive <br /> Sequoia Morgan Hill,CA 95037 <br /> mW Analytical (408)7 -9600 <br /> FAX(408)78282-6308 <br /> www.sequoialabs.com <br /> URS Corporation[Arco II Project:ARCO#0595,CA MPA0032 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOBZG-0002 Reported: <br /> Sacramento CA,95833 Project ManagerNetnon P.Elarth 01/06/06 11:40 <br /> Total Metals by EPA 6000/7000 Series Methods- 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 6AO5025-EPA 3050B/EPA 6010B <br /> Blank(6AO5025-BLK1) Prepared&Analyzed:01/05/06 <br /> Lead ND 5.0 mg/kg <br /> Laboratory Control Sample(6AO5025-BSI) Prepared&Analyzed:01/05/06 <br /> Lead 47.2 5.0 mg/kg 50.0 94 75-120 <br /> Matrix Spike(6AO5025-MSI) Source:MOL0982-01 Prepared&Analyzed:01/05/06 <br /> Lead 134 10 mg/kg 50.0 88 92 75-120 <br /> Matrix Spike Dup(6AO5025-MSDI) Source:MOL0982-01 Prepared&Analyzed:01/05/06 <br /> Lead 129 10 mg/kg 50.0 88 82 75-120 4 20 <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 /> Page 8 of 13 <br />