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1 <br /> Z— (409) <br /> Sequoia BBSl,CA 5037Morgan Hill,CA 95037 776-9600 <br /> Analytical FAX(408)782-6308 <br /> www.sequoialabs.com <br /> r <br /> URS Corporation[Arco 11 Project:ARCO#2168,Stockton,CA MOK0481 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOCS 1-00 10 Reported: <br /> t <br /> Sacramento CA,95833 Project ManagerVernon P.Elarth 11/15/05 10:16 <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 5K11011 -EPA 3050B 1 EPA 6010B <br /> BIank(5K11011-BLK1) Prepared&Analyzed: 11/11/05 <br /> Lead ND 5.0 mg/kg <br /> Laboratory Control Sample(5K11011-BS1) Prepared&Analyzed: I1/11105 <br /> Lead 44.6 5.0 mg/kg 50.0 89 75-120 <br /> Matrix Spike(5KI1011-MSI) Source:MOK0319-01 Prepared&Analyzed: 11/11/05 <br /> Lead 42.8 5.0 mg/kg 50.0 2.6 80 75-120 <br /> l <br /> Matrix Spike Bup(SK11011-MSD1) Source:MOK0319-01 Prepared&Analyzed: 11/11/05 <br /> Lead 43.7 5.0 mg/kg 50.0 2.6 82 75-120 2 20 <br /> i <br /> ` <br /> Sequoia Analytical-Morgan Hill <br /> g � g The results in this report apply to the samples analyzed in accordance with the chain of i <br /> custody document. Unless otherwise stated,results are reported on a wet weight basis. <br /> Thls analytical report must be reproduced in its entirety. <br /> Page 6 of 7 <br />