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A • 1455 McDowell Blvd,North Ste <br /> Sequoia Petaluma, 949544 <br /> ' + (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www.sequoialabs.com <br /> MACTEC E&C-Petaluma Project:General Commercial P412379 <br /> 5341 Old Redwood Highway,Suite 300 Project Number:Sears/Tracy-UST/AST-3205040383.02 departed: <br /> Petaluma CA,94954 Project Manages:Gary Lieberman 01/05/05 10:53 <br /> Total Metals by EPA 6000/7000 Series Methods-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> ' Batch 4120476-EPA 3050B/EPA 60108 <br /> Matrix Spike(4120476-MSI) Source:P412379-01 Prepared&Analyzed: 12/27/04 <br /> Antimony 16.1 4.5 mgtkg 37.3 ND 43 75-125 QM02 <br /> Arsenic 41.6 7.5 37.3 9.2 87 75-125 <br /> Barium 210 0.75 37.3 180 80 75-125 <br /> Beryllium 3.76 0.075 3.73 0.46 88 75-125 <br /> Cadmium 3.49 0.75 3.73 ND 94 75-125 <br /> Chromium 62.7 0.75 37.3 28 93 75-125 <br /> Cobalt 41.8 0.52 37.3 10 85 75-125 <br /> Copper 58.4 1.5 37.3 28 82 75-125 <br /> ' Lead 39.5 5.6 37.3 6.5 88 75-125 <br /> Molybdenum 30.8 1.5 37.3 1.1 80 75-125 <br /> Nickel 69.1 2.2 37.3 35 91 75-125 <br /> 1 Selenium 31.2 7.5 37.3 ND 84 75-125 <br /> Silver 2.76 0.52 3.73 ND 74 75-125 QM02 <br /> Thallium 29.9 7.5 37.3 ND 80 75-125 <br /> Vanadium 68.8 0.75 37.3 35 91 75-125 <br /> ' Zinc 79.0 1.5 37.3 48 83 75-125 <br /> Matrix Spike Dup(4120476-MSDI) Source:P412379-01 Prepared&Analyzed: 12/27/04 <br /> Antimony 16.6 4.8 mg/kg 39.7 ND 42 75-125 3 20 QM02 <br /> ' Arsenic 42.5 7.9 39.7 9.2 84 75-125 2 20 <br /> Barium 212 0.79 39.7 180 81 75-125 0.9 20 <br /> Beryllium 3.99 0.079 3.97 0.46 89 75-125 6 20 <br /> Cadmium 3.63 0.79 3.97 ND 91 75-125 4 20 <br /> Chromium 65.5 0.79 39.7 28 94 75-125 4 20 <br /> Cobalt 43.9 0.56 39.7 10 85 75-125 5 20 <br /> Copper 65.8 L6 39.7 28 95 75-125 12 20 <br /> Lead 41.1 6.0 39.7 6.5 87 75-125 4 20 <br /> Molybdenum 33.0 1.6 39.7 1.1 80 75-125 7 20 <br /> Nickel 70.2 2.4 39.7 35 89 75-125 2 20 <br /> Selenium 33.7 7.9 39.7 ND 85 75-125 8 20 <br /> Silver 2.91 0.56 3.97 ND 73 75-125 5 20 QM02 <br /> Thallium 31.3 7.9 39.7 ND 79 75-125 5 20 <br /> Vanadium 71.9 0.79 39.7 35 93 75-125 4 20 <br /> Zinc 87.9 1.6 39.7 48 101 75-125 II 20 <br /> ' Sequoia Analytical-Petaluma 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 36 of 46 <br />