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1455 McDowe <br /> Sequoia Petaluma,CA 94954ll Blvd North Ste 4 <br /> Analytical (707)792- <br /> 1865 FAX(707)792-0342342 <br /> • www sequoialabs cont <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P401386 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36588 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/29/04 19 13 <br /> Notes and Definitions <br /> QM-RX The spike recovery was outside control limits for the MS and/or MSD due to matrix interference Re-extraction/re-analysis <br /> performed to confirm original MS/MSD results <br /> QR-02 The RPD result exceeded the control limits,however,both percent recovenes were acceptable Sample results for the QC batch <br /> were accepted based on percent recoveries and completeness of QC data <br /> QR-07 The RPD was outside control limits The results may still be useful for their intended purpose <br /> S-04 The surrogate recovery for this sample is outside control limits due to interference from the sample matrix <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 <br /> quoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 8 of 8 <br />