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404 N WISet Lane <br /> Walnut Creek CA 94598 <br /> Sequoia (925)988-9600 <br /> FAX(925)988-9673 <br /> Analytical www sequoEalaln coni <br /> Ottic;r Ryan,Inc -Dublin Project Tosco <br /> 6747 Sierra Court Suite J Project Number Tosca 4 11193 Reported <br /> Dublin CA,94568 Project Manager Doug Lee 04-Jan-01 10 26 <br /> Total Metals by EPA 6000/7000 Series Methods - Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lunn Units Level Result %REC Limits RPD Lunn Notes <br /> Batch OL21022-200,7 <br /> Blank(OL21022-BLK1) Prepared 21-Dec-00 Analyzed 30-Dec-00 <br /> Antimony ND 010 me <br /> Arsenic ND 010 " <br /> Barium ND 0 010 " <br /> Beryllium ND 0 010 " <br /> Cadmium ND 0 010 " <br /> Chromium ND 0 010 <br /> Cobalt ND 0 010 " <br /> Copper ND 0 010 „ <br /> Lead ND 0 020 " <br /> Molybdenum ND 0 010 " <br /> Nickel ND 0 010 " <br /> Selenium ND 010 " <br /> V.-'rND 0010 <br /> dium ND 020 " <br /> Zinc ND 0 020 " <br /> LCS(OL21022-BS1) Prepared 21-Dec-00 Analyzed 30-Dec-00 <br /> Cadmium 104 0 010 m9/1 100 104 80-120 <br /> Chromium 108 0 010 100 108 80-120 <br /> Copper 120 0 010 1 00 120 80-120 <br /> Lead 0 978 0 020 100 978 80-120 <br /> Nickel 107 0 010 100 107 80-120 <br /> Zinc 102 0 020 100 102 80-120 <br /> LCS Dap(OL21022-BSD1) Prepared 21-Dec-00 Analyzed 30-Dec-00 <br /> Cadmium 1 07 0 010 mg/l 100 107 80-120 284 20 <br /> Chromium 114 0 010 1 00 114 80-120 541 20 <br /> Copper 120 0 010 100 120 80-120 0 20 <br /> Lead 101 0 020 100 101 80-120 322 20 <br /> Nickel 109 0 010 100 109 80-120 185 20 <br /> Zinc 104 0 020 too 104 80-120 194 20 <br /> equoia Analytical-Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 13 of 27 <br />