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1455 McDowell Blvd,North Ste <br /> Petalume,CA4Se <br /> Sequoia (707)792-1865 <br /> Analytical <br /> FAX.seq 7) labsxo2 <br /> wwwsequoialabs.com <br /> MACTEC E&C-Petaluma Project General Commercial P412379 <br /> 5341 Old Redwood Highway,Suite 300 Project NumbecSears/Tracy-UST/AST-3205040383.02 Reported: <br /> Petaluma CA,94954 Project Manager: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 %P-EC Limits RPD Limit Notes <br /> Batch 4120476-EPA 3050B/EPA 60108 <br /> Blank(4120476-BLKI) Prepared&Analyzed: 12/27/04 <br /> Antimony ND 6.0 mg/kg <br /> Arsenic ND 10 " <br /> Barium ND 1.0 " <br /> Beryllium ND 0.10 " <br /> Cadmium ND 1.0 " <br /> Chromium ND 1.0 " <br /> Cobalt ND 0.70 " <br /> Copper ND 2.0 " <br /> Lead ND 7.5 " <br /> Molybdenum ND 2.0 " <br /> Nickel ND 3.0 " <br /> Selenium ND 10 " <br /> Silver ND 0.70 " <br /> Thallium ND 10 " <br /> Vanadium ND 1.0 " <br /> Zinc ND 2.0 " <br /> Laboratory_Control Sample(_4120476-BSI) Prepared&Analyzed: 12/27/04 T <br /> Antimony 46.5 6.0 mg/kg 50.0 93 80-120 <br /> Arsenic 49.1 10 50.0 98 80-120 <br /> Barium 47.4 1.0 50.0 95 80-120 <br /> Beryllium 4.67 0.10 500 93 80-120 <br /> Cadmium 4.76 1.0 5.00 95 80-120 <br /> Chromium 47.3 1.0 50.0 95 80-120 <br /> Cobalt 46.5 0.70 50.0 93 80-120 <br /> Copper 46.1 20 50.0 92 80-120 <br /> Lead 47.2 7.5 50.0 94 80-120 <br /> Molybdenum 46.7 2.0 50.0 93 80-120 <br /> Nickel 45.9 3.0 50.0 92 80-120 <br /> Selenium 45.9 10 50.0 92 80-120 <br /> Silver 4.67 0.70 5.00 93 80-120 <br /> Thallium 47.3 10 50.0 95 80-120 <br /> Vanadium 46.5 1.0 50.0 93 80-120 <br /> Zinc 459 2.0 50.0 92 80-120 <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 35 of 46 <br />