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+ ;, 819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical <br /> fry. FAX(916)921-0100 <br /> Analytical www,sequolalabs.com <br /> City of Stockton Project: Oil Spill/Mormon Slough Box Culvert <br /> 2500 Navy Dr. Project Number: NIA Reported: <br /> Stockton CA,95206 Project Manager: Larry Huber 08/24/01 14:07 <br /> Total Metals by EPA 6000/7000 Series Methods - Quality Control <br /> Sequoia Analytical -Sacramento <br /> i <br /> Reporting Spike Source °/aREC RPD <br /> Analyte Result Limit Units Level Result %RHC Limits RPD Limit Notes <br /> Batch 1080075-EPA 3050B <br /> I <br /> Blank(1080075-BLK1) Prepared:08/07/01 Analyzed:08/14/01 <br /> Cadmium ND 0.25 mg/kg <br /> Chromium ND 0.25 " <br /> i <br /> Copper ND 0.25 <br /> Lead ND 15 " <br /> Nickel ND 1.0 " <br /> Silver ND 0.25 " <br /> Zinc 0.385 0.25 Q-19 <br /> _LCS(1080075-BSI) Prepared:08/07/01 Analyzed:08/14/01 <br /> Cadmium 50.5 0.25 mg/kg 50.0 101 80-120 <br /> Chromium 51.7 0.25 50.0 103 80-120 <br /> Copper 51.0 0.25 50.0 102 80-120 <br /> Lead 51.1 2.5 50:0 102 80-120 <br /> Nickel 51.9 1.0 50.0 104 80-120 <br /> Silver 50.0 0.25 50.0 100 80-120 <br /> Zinc 50.3 0.25 50.0 101 80-120 <br /> Matrix Spike(1080075-MSI) _ Source:5108082-07 Prepared:08/07/01 Analyzed:08/14/01 <br /> Cadmium i 48.9 1.0 mg/kg 50.0 ND 97.8 80.120 <br /> Chromium 56.8 1.0 50.0 7.3 99.0 80.120 <br /> Copper 59.8 1.0 50.0 9.6 100 80-120 j <br /> Lead 50.5 10 50.0 ND 96.6 80-120 <br /> Nickel 59.1 4,0 50.0 9.0 100 80-120 <br /> Silver 47,6 1.0 50.0 ND 95.2 80-120 <br /> Zinc 69.6 1.0 50.0 19 101 80-120 <br /> Matrix Spike Dup(1080075-MSD1) Source:5108082-07 Prepared:08/07/01 Analyzed:08/14/01 <br /> Cadmium 48.6 1.0 mg/kg 50.0 ND 97.2 80-120 0.615 20 <br /> Chromium 56.1 1.0 50.0 7.3 97.6 80-120 1.24 20 <br /> i <br /> Copper 58.3 1.0 50.0 9.6 97.4 80-120 2.54 20 <br /> Lead 50.0 10 50.0 NO 95.6 80-120 0.995 20 <br /> Mickel 58.3 4.0 50.0 9.0 98.6 80-120 1.36 20 <br /> Silver 47.0 1.0 50.0 ND 94.0 80-120 1.27 20 <br /> Zinc 68.2 1.0 50.0 19 98.4 80-120 2.03 20 <br /> l <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 5 of 6 <br /> 1. <br />