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Excelchem Laboratories,Inc. DTE Stockton,LLC Project: Scrubber Ball Profile 2526 W.Washington St. Project Number: 4700995195 Date Reported: Stockton,CA 95203 Project Manager: Genny Huffman 11/05/20 17:12 TCLP Analysis-Quality Control Reporting Spike Source %REC RPD Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes Batch A^K0047-EPA 6010B LCS(A A K0047-BS1) Prepared: 11/03/20 Analyzed: 11/05/20 Antimony 9.91 0.2 mg/L 10.0 99.1 80-120 Arsenic 9.95 0.2 10.0 99.5 80-120 Barium 9.49 0.4 10.0 94.9 80-120 Beryllium 9.76 0.1 10.0 97.6 80-120 Cadmium 9.90 0.2 10.0 99.0 80-120 Chromium 9.75 0.2 10.0 97.5 80-120 Cobalt 9.67 1.0 10.0 96.7 80-120 Copper 9.51 0.4 10.0 95.1 80-120 Lead 9.68 0.2 10.0 96.8 80-120 Molybdenum 9.90 0.2 10.0 99.0 80-120 Nickel 9.64 0.2 10.0 96.4 80-120 Selenium 9.80 0.4 10.0 98.0 80-120 Silver 9.63 0.4 10.0 96.3 80-120 Thallium 9.32 0.4 10.0 93.2 80-120 Vanadium 9.75 0.4 10.0 97.5 80-120 Zinc 10.0 0.4 10.0 100 80-120 LCS Dup(A^K0047-BSD1) Prepared:11/03/20 Analyzed: 11/05/20 Antimony 9.89 0.2 mg/L 10.0 98.9 80-120 0.182 25 Arsenic 9.94 0.2 10.0 99.4 80-120 0.0905 25 Barium 9.53 0.4 10.0 95.3 80-120 0.431 25 Beryllium 9.70 0.1 10.0 97.0 80-120 0.607 25 Cadmium 9.89 0.2 10.0 98.9 80-120 0.131 25 Chromium 9.75 0.2 10.0 97.5 80-120 0.0308 25 Cobalt 9.66 1.0 10.0 96.6 80-120 0.135 25 Copper 9.53 0.4 10.0 95.3 80-120 0.231 25 Lead 9.66 0.2 10.0 96.6 80-120 0.196 25 Molybdenum 9.88 0.2 10.0 98.8 80-120 0.212 25 Nickel 9.63 0.2 10.0 96.3 80-120 0.176 25 Selenium 9.80 0.4 10.0 98.0 80-120 0.0102 25 Silver 9.76 0.4 10.0 97.6 80-120 1.32 25 Thallium 9.34 0.4 10.0 93.4 80-120 0.182 25 Vanadium 9.78 0.4 10.0 97.8 80-120 0.317 25 Zinc 10.0 0.4 10.0 100 80-120 0.0997 25 Excelchem Laboratories.inc. The results in this report apply to the samples analyzed in accordance with the chain of custody document.This analytical report must be reproduced in its entirety. Laboratory Representative Page 4of6