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819 Striker Avenue,Suite 8 <br /> Sacramento,j 95834 5834 <br /> Sequoia 916 921- 00 <br /> FAX 92 1-0 100 <br /> Analytical wwv.scquoialabs.com <br /> Delta Environmental Consultants(Carneron Park) Project: Arco 6100,Tracy,CA <br /> 3330 Cameron Park Dr..Ste 550 Project Number: N/A Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 09/25/01 17:09 <br /> Total Metals by EPA 6000/7000 Series Methods-Quality Control <br /> Sequoia Analytical-Sacramento <br /> Reporting Spike Source %REC RPD <br /> '4 Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1090251-EPA 3050B <br /> Blank(1090251-BLKI) Prepared:09/24/01 Analyzed:09/25/01 <br /> Lead ND 2.5 mg/kg <br /> LCS(1090251-BS1) Prepared:09/24/01 Analyzed:09/25/01 <br /> Lead 51.2 2.5 mg/kg 50.0 102 80-120 <br /> Matrix Spike 1090251-MSl Source:5109337-01 Prepared:09/24/01 Analyzed:09/25/01 <br /> Lead 52.3 10 mg/kg 50.0 ND 105 80-120 <br /> Matrix Spike Du 1090251-MSD/ Source: 5109337-01 Prepared:09/24/01 Analyzed:09/25/01 <br /> Lead 51.8 10 mg/kg 50.0 ND 104 80-120 0.961 20 <br /> 1 <br /> i <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. This analytical report must be reproduced in its entirety. <br /> I <br /> Page Page 3 of 4 <br />