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• • 404 N. Wiget Lane <br />Walnut <br />Sequoia Creek, CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-%73 <br />Analytical 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 />Total Metals by EPA 6000/7000 Series Methods - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch 2HO2008 - EPA 3050B <br />Blank (2H02008-BLKI) <br />Prepared: 02 -Aug -02 Analyzed: 06 -Aug -02 <br />Cadmium <br />ND <br />0.50 <br />mg/kg <br />Chromium <br />ND <br />0.50 <br />" <br />Lead <br />2.65 <br />1.0 <br />" <br />Nickel <br />ND <br />1.0 <br />" <br />Zinc <br />ND <br />1.0 <br />" <br />LCS (2H02008 -BSI) <br />Prepared: 02 -Aug -02 Analyzed: 06 -Aug -02 <br />Cadmium <br />68.0 <br />0.50 <br />mg/kg <br />50.0 136 80-120 <br />Chromium <br />65.6 <br />0.50 <br />50.0 131 80-120 <br />Lead <br />67.3 <br />1.0 <br />50.0 135 80-120 <br />Nickel <br />66.2 <br />1.0 <br />50.0 132 80-120 <br />Zinc <br />69.3 <br />1.0 <br />50.0 139 80-120 <br />Matrix Spike (2H02008 -MSI) <br />Source: W208022-01 <br />Prepared: 02 -Aug -02 Analyzed: 06 -Aug -02 <br />Cadmium <br />55.2 <br />0.50 <br />mg/kg <br />50.0 ND 110 80-120 <br />Chromium <br />102 <br />0.50 <br />50.0 45 114 80-120 <br />Lead <br />63.7 <br />1.0 <br />50.0 10 107 80-120 <br />Nickel <br />97.6 <br />1.0 <br />50.0 48 99.2 80-120 <br />Zinc <br />100 <br />1.0 <br />50.0 47 106 80-120 <br />Matrix Spike Dup (2H02008-MSD1) <br />Source: W208022-01 <br />Prepared: 02 -Aug -02 Analyzed: 06 -Aug -02 <br />Cadmium <br />56.6 <br />0.50 <br />mg/kg <br />50.0 ND 113 80-120 2.50 <br />20 <br />Chromium <br />103 <br />0.50 <br />50.0 45 116 80-120 0.976 <br />20 <br />Lead <br />63.4 <br />1.0 <br />50.0 10 107 80-120 0.472 <br />20 <br />Nickel <br />94.6 <br />1.0 <br />50.0 48 93.2 80-120 3.12 <br />20 <br />Zinc <br />102 <br />1.0 <br />50.0 47 110 80-120 1.98 <br />20 <br />Q-19 <br />A-01 <br />A-01 <br />A-01 <br />A-01 <br />A-01 <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 13 of 20 <br />