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(D- <br /> 885 Jarvis Drive <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> www.sequoialabs.com <br /> URS Corporation[ArcolI Project:ARCO#0595,CA MPA0137 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOBZG-0002 Reported: <br /> Sacramento CA,95833 Project Manager:Vcmon P.Elarth 01/20/06 10:54 <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 6A12032-EPA 3050B/EPA 601 OB <br /> Blank(6A12032-BLK1) Prepared:01/12/06 Analyzed:01/16/06 <br /> Lead ND 5.0 mg/kg <br /> Laboratory Control Sample(6A12032-BS1) Prepared:01/12/06 Analyzed:01/16/06 <br /> Lead 46.7 5.0 mg/kg 50.0 93 75-120 <br /> Matrix Spike(6A12032-MS1) Source:MPA0137-01 Prepared:01/12/06 Analyzed:01/16/06 <br /> Lead 51.0 10 mg/kg 50.0 8.1 86 75-120 <br /> w <br /> Matrix Spike Dup(6A12032-MSDI) Source:MPA0137-01 Prepared:01/12/06 Analyzed:01/16/06 <br /> Lead 51.0 10 mg/kg 50.0 8.1 86 75-120 0 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 9 of 14 <br />