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4DSequoia 885 Jarvis Imve <br /> Morgan Hill,CA 95037 <br /> JW Analytical (408)776-9600 <br /> FAX(408)782-6308 <br /> www.sequoialabs.corn <br /> URS Corporation[Arco1J Project:ARCO#2168,Stockton,CA MOK0704 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Nurrtber:GOC81-0010 <br /> i Reported: <br /> Sacramento CA,95833 Project Manager:Vemon P.Elarth 11/17/05 I7:20 <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 /> FBatch 5K17022-EPA 3050B/EPA 6010B <br /> Blank(5K17022-BLKI) Prepared&Analyzed: 11/17/05 <br /> Lead ND 5.0 mg/kg <br /> I <br /> Laboratory Control Sample(5K17022-BSI) Prepared&Analyzed: 11/17/05 <br /> Lead 43.2 5.0 mg/kg 50.0 86 75-120 <br /> Matrix Spike(5K17022-MS1) Source:MOK0729-01 Prepared&Analyzed: 11/17/05 <br /> Lead 51.6 5.0 mg/kg 50.0 9$ 84 75-120 l <br /> Matrix Spike Dup(5K17022-MSD1) Source:MOK0729-01 Prepared&Analyzed: 11/17/05 <br /> Lead 45.3 5.0 mg/kg 50.0 9.8 71 75-120 13 20 <br /> LN <br /> 1 <br /> I <br /> I <br /> t F <br /> l <br /> F <br /> I <br /> F <br /> FSequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chem 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 6 of 7 <br />