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Excelchem Environmental Labs DTE Stockton,LLC Project: Ash 2526 W.Washington St. Project Number: #4701180998 Date Reported: Stockton,CA 95203 Project Manager: Dan Crawford 02/20/18 17:00 Total Recoverable Metals-Quality Control Reporting Spike Source %REC RPD Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes Batch A\B0208-EPA 6010B LCS(A\B0208-BS1) Prepared&Analyzed:02/20/18 Antimony 104 1.0 mg/kg 100 104 80-120 Arsenic 102 1.0 100 102 80-120 Arsenic 102 1.0 100 102 80-120 Barium 99.3 2.0 100 99.3 80-120 Beryllium 101 0.5 100 101 80-120 Cadmium 99.3 1.0 100 99.3 80-120 Chromium 102 1.0 100 102 80-120 Cobalt 102 5.0 100 102 80-120 Copper 100 2.0 100 100 80-120 Lead 101 1.0 100 101 80-120 Molybdenum 103 1.0 100 103 80-120 Nickel 103 1.0 100 103 80-120 Lead 101 1.0 100 101 80-120 Selenium 99.1 2.0 100 99.1 80-120 Silver 91.8 1.0 100 91.8 80-120 Thallium 109 2.0 100 109 80-120 Vanadium 97.6 2.0 100 97.6 80-120 Zinc 97.9 2.0 100 97.9 80-120 LCS Dup(A\B0208-BSD1) Prepared&Analyzed:02/20/18 Antimony 105 1.0 mg/kg 100 105 80-120 0.287 25 Arsenic 102 1.0 100 102 80-120 0.0979 25 Arsenic 102 1.0 100 102 80-120 0.0979 25 Barium 99.2 2.0 100 99.2 80-120 0.131 25 Beryllium 100 0.5 100 100 80-120 0.199 25 Cadmium 99.2 1.0 100 99.2 80-120 0.101 25 Chromium 102 1.0 100 102 80-120 0.0978 25 Cobalt 102 5.0 100 102 80-120 0.293 25 Copper 99.0 2.0 100 99.0 80-120 1.13 25 Lead 101 1.0 100 101 80-120 0.00 25 Molybdenum 102 1.0 100 102 80-120 0.584 25 Nickel 103 1.0 100 103 80-120 0.00 25 Lead 101 1.0 100 101 80-120 0.00 25 Selenium 99.8 2.0 100 99.8 80-120 0.674 25 Silver 91.5 1.0 100 91.5 80-120 0.404 25 Thallium 110 2.0 100 110 80-120 1.37 25 Vanadium 96.3 2.0 100 96.3 80-120 1.39 25 Zinc 97.7 2.0 100 97.7 80-120 0.235 25 Excelchem Environmental Lab. 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 8 of 15