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*rr/ 885 Jarvis Dr <br /> Sequoia Margin Hill,CA 95037 <br /> (—&— <br /> Analytical (408)776-9600 <br /> FAX(408)776-6308 <br /> www.wquoialabs.cun <br /> URS Corporation[11 Project: ARCO#434 MLJ0673 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#434 Reported: <br /> Sacramento CA,95833 Project Manager: Vern Elarth 11/12/02 10:24 <br /> Notes and Definitions <br /> 0-10 The result was reported with a possible low bias due to the continuing calibration verification falling outside the acceptance <br /> criteria. <br /> QM-07 The spike recovery was outside control limits for the MS and/or MSD. The batch was accepted based on acceptable LCS <br /> recovery. <br /> QR-02 The RPD result exceeded the control limits;however,both percent recoveries were acceptable.Sample results for the QC batch <br /> were accepted based on percent recoveries and completeness of QC data. <br /> DET Analyte DETECTED <br /> ND Analyte NOT DETECTED at or above the reporting limit <br /> NR Not Reported <br /> dry Sample results reported on a dry weight basis <br /> RPD Relative Percent Difference <br /> Sequoia Analytical-Morgan Hill 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 most be reproduced in its entirety. <br /> 16 of 16 <br />