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Sequoia <br />-•�,� Analytical <br />819 Striker Avenue, Suite 8 <br />Sacramento, CA 95834 <br />(916)921-9600 <br />FAX (916) 921-0100 <br />www.sequoialabs.com <br />Delta Environmental Consultants (Cameron Park) Project: Arco 6100, Tracy, CA <br />3330 Cameron Park Dr. Ste 550 Project Number: Arco 6100, Tracy, CA Reported: <br />Cameron Park CA, 95682 Project Manager: Jay Johnson 01/23/02 11:25 <br />Total Metals by EPA 6000/7000 Series Methods - Quality Control <br />Sequoia Analytical - Sacramento <br />Reporting Spike Source %REC RPD <br />Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch 2010246 - EPA 3050B <br />Blank (2010246-BLKI) Prepared & Analyzed: 01/21/02 <br />Lead ND 2.5 mg/kg <br />LCS (2010246 -BSI) Prepared & Analyzed: 01/21/02 <br />Lead 49.2 2.5 mg/kg 50.0 98.4 80-120 <br />Matrix Spike (2010246-MS1) Source: S201303-01 Prepared & Analyzed: 01/21/02 <br />Lead 48.5 10 mg/kg 50.0 ND 86.0 80-120 <br />Matrix Spike Dup (2010246-MSD1) Source: S201303-01 Prepared & Analyzed: 01/21/02 <br />Lead 49.9 10 mg/kg 50.0 ND 88.8 80-120 2.85 20 <br />Sequoia Analytical - Sacramento <br />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 Page 14 of 17 <br />