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Excelchem Environmental Labs DTE Stockton,LLC Project: Ash 2526 W.Washington St. Project Number: 4701052861 Date Reported: Stockton,CA 95203 Project Manager: Dan Crawford 11/14/17 18:02 Total Recoverable Metals-Quality Control Reporting Spike Source %REC RPD Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes Batch A[K0085-EPA 6010B LCS(A[K0085-BS1) Prepared&Analyzed: 11/13/17 Antimony 106 1.0 mg/kg 100 106 80-120 Arsenic 107 1.0 100 107 80-120 Arsenic 107 1.0 100 107 80-120 Barium 112 2.0 100 112 80-120 Beryllium 107 0.5 100 107 80-120 Cadmium 103 1.0 100 103 80-120 Chromium 108 1.0 100 108 80-120 Cobalt 108 5.0 100 108 80-120 Copper 110 2.0 100 110 80-120 Lead 107 1.0 100 107 80-120 Molybdenum 107 1.0 100 107 80-120 Lead 107 1.0 100 107 80-120 Nickel 107 1.0 100 107 80-120 Selenium 102 2.0 100 102 80-120 Silver 107 1.0 100 107 80-120 Thallium 106 2.0 100 106 80-120 Vanadium 110 2.0 100 110 80-120 Zinc 105 2.0 100 105 80-120 LCS Dup(A[K0085-BSD1) Prepared&Analyzed: 11/13/17 Antimony 107 1.0 mg/kg 100 107 80-120 1.78 25 Arsenic 108 1.0 100 108 80-120 1.49 25 Arsenic 108 1.0 100 108 80-120 1.49 25 Barium 112 2.0 100 112 80-120 0.179 25 Beryllium 107 0.5 100 107 80-120 0.561 25 Cadmium 105 1.0 100 105 80-120 1.44 25 Chromium 109 1.0 100 109 80-120 1.47 25 Cobalt 109 5.0 100 109 80-120 1.29 25 Copper 111 2.0 100 111 80-120 0.817 25 Lead 108 1.0 100 108 80-120 1.21 25 Molybdenum 109 1.0 100 109 80-120 1.57 25 Lead 108 1.0 100 108 80-120 1.21 25 Nickel 108 1.0 100 108 80-120 1.49 25 Selenium 104 2.0 100 104 80-120 1.46 25 Silver 107 1.0 100 107 80-120 0.187 25 Thallium 108 2.0 100 108 80-120 1.49 25 Vanadium 111 2.0 100 111 80-120 1.18 25 Zinc 111 2.0 100 111 80-120 5.09 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