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Q <br />v <br />Sequoia 0 <br />Analytical <br />404 N. Wiget Lane <br />is Walnut Creek, CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www.sequoialabs.com <br />Secor - Rancho Cordova Project: Arco <br />3017 Kilgore Rd., Ste. #100 Project Number: Arco # 2133, Stockton Reported: <br />Rancho Cordova CA., 95670 Project Manager: Rusty Benkosky 14 -Aug -02 13:16 <br />Notes and Definitions <br />A-01 The Blank Spike Recovery was above control limits for this analyte. This should be considered when evaluating the data for its <br />intended purpose. <br />C-01 To reduce matrix interference, the sample extract has undergone sulfuric acid clean-up, method 3665, which is specific to <br />hydrocarbon contamination. <br />C-06 To reduce matrix interference, the sample extract has undergone TBA (sulfur) clean-up, method 3660B. <br />HC -12 Hydrocarbon pattern is present in the requested fuel quantitation range but does not resemble the pattern of the requested fuel. <br />Q-19 The method blank contains this analyte at a concentration above the method reporting limit. This should be considered in <br />evaluating the data for its intended purpose. <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 />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 - 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 20 of 20 <br />01 <br />