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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 11/13/17 17:56 Total Recoverable Metals-Quality Control Reporting Spike Source %REC RPD Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes Batch A[K0080-EPA 6010B LCS(A[K0080-BS1) Prepared: 11/10/17 Analyzed: 11/13/17 Antimony 100 1.0 mg/kg 100 100 80-120 Arsenic 100 1.0 100 100 80-120 Arsenic 100 1.0 100 100 80-120 Barium 111 2.0 100 111 80-120 Beryllium 108 0.5 100 108 80-120 Cadmium 99.1 1.0 100 99.1 80-120 Chromium 102 1.0 100 102 80-120 Cobalt 103 5.0 100 103 80-120 Copper 111 2.0 100 111 80-120 Lead 102 1.0 100 102 80-120 Molybdenum 102 1.0 100 102 80-120 Nickel 100 1.0 100 100 80-120 Lead 102 1.0 100 102 80-120 Selenium 95.4 2.0 100 95.4 80-120 Silver 110 1.0 100 110 80-120 Thallium 101 2.0 100 101 80-120 Vanadium 110 2.0 100 110 80-120 Zinc 100 2.0 100 100 80-120 LCS Dup(A[K0080-BSD1) Prepared:11/10/17 Analyzed:11/13/17 Antimony 104 1.0 mg/kg 100 104 80-120 4.21 25 Arsenic 104 1.0 100 104 80-120 4.30 25 Arsenic 104 1.0 100 104 80-120 4.30 25 Barium 112 2.0 100 112 80-120 0.984 25 Beryllium 111 0.5 100 111 80-120 3.47 25 Cadmium 103 1.0 100 103 80-120 3.70 25 Chromium 111 1.0 100 111 80-120 8.18 25 Cobalt 107 5.0 100 107 80-120 3.71 25 Copper 113 2.0 100 113 80-120 1.69 25 Lead 106 1.0 100 106 80-120 4.15 25 Molybdenum 107 1.0 100 107 80-120 4.41 25 Lead 106 1.0 100 106 80-120 4.15 25 Nickel 107 1.0 100 107 80-120 6.17 25 Selenium 100 2.0 100 100 80-120 4.93 25 Silver 110 1.0 100 110 80-120 0.454 25 Thallium 106 2.0 100 106 80-120 4.06 25 Vanadium 112 2.0 100 112 80-120 1.81 25 Zinc 104 2.0 100 104 80-120 4.21 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