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C� <br />819 Striker Avenue, Suite 8 <br />Sacramento, CA 95834 <br />(916) 921-9600 <br />FAX (916) 921-0100 <br />www.sequoialabs.com <br />Kleinfelder - Stockton Project: Granite Burnpile <br />2825 East Myrtle Street Project Number: 20-1108-33 Reported: <br />Stockton CA, 95205 Project Manager: Doug Heard 08/15/01 17:24 <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 1080056 - EPA 3050B <br />Matrix Spike Dup (10_8. 0056--MSD1) <br />Source: 5107384-10 <br />Prepared: 08/06/01 <br />Analyzed: 08/08/01 <br />_ <br />_ <br />Arsenic <br />50.3 <br />10 mg/kg <br />50.0 ND <br />101 80-120 <br />0.199 <br />20 <br />Cadmium <br />47.8 <br />1.0 <br />50.0 ND <br />95.6 80-120 <br />0.00 <br />20 <br />Chromium <br />54.2 <br />1.0 <br />50.0 6.2 <br />96.0 80-120 <br />0.185 <br />20 <br />Nickel <br />59.3 <br />4.0 <br />50.0 8.1 <br />102 80-120 <br />1.36 <br />20 <br />Zinc <br />79.4 <br />1.0 <br />50.0 31 <br />96.8 80-120 <br />1.78 <br />20 <br />Batch 1080142 - EPA 7471A <br />Blank (1080142-BLKI <br />Mercury <br />ND 0.020 mg/kg <br />08/13/01 Analyzed: 08/14/01 <br />LCS (10801_42-BS1) _ Prepared: 08/13/01 Analyzed: 08/14/01 <br />Mercury 0.383 0.020 mg/kg 0.417 91.8 80-120 <br />Matrix Spike_ (1080.1.4_2 -MSI) Source: 5108095-02 _ Prepared: 08/13/01 Analyzed: 08/14/01 <br />Mercury 0.548 0.020 mg/kg 0.417 0.15 95.4 75-125 <br />Matrix Spike_Du_ p (1080142-MSDI)_ _ Source: 5108095-02 Prepared: 08/13/01 Analyzed: 08/14/01 <br />Mercury 0.526 0.020 mg/kg 0.417 0.15 90.2 75-125 4.10 20 <br />Sequoia Analytical - Sacramento 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 20 <br />