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Excelchem Environmental Labs DTE Stockton,LLC Project: Ash 2526 W.Washington St. Project Number: [none] Date Reported: Stockton,CA 95203 Project Manager: Dan Crawford 08/07/17 10:51 STLC Metals-Quality Control Reporting Spike Source %REC RPD Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes Batch A[H0056-EPA 6010B LCS(A[H0056-BS1) Prepared&Analyzed:08/04/17 Antimony 20.6 2.0 mg/L 20.0 103 80-120 Arsenic 22.4 0.2 20.0 112 80-120 Barium 20.4 0.4 20.0 102 80-120 Beryllium 19.3 0.1 20.0 96.4 80-120 Cadmium 19.5 0.2 20.0 97.4 80-120 Chromium 20.6 0.2 20.0 103 80-120 Cobalt 19.4 1.0 20.0 96.8 80-120 Copper 18.2 0.4 20.0 91.0 80-120 Lead 19.0 0.2 20.0 94.8 80-120 Molybdenum 20.7 0.2 20.0 103 80-120 Nickel 18.6 0.2 20.0 92.8 80-120 Selenium 21.1 0.4 20.0 106 80-120 Silver 18.3 0.4 20.0 91.4 80-120 Thallium 18.0 0.4 20.0 90.2 80-120 Vanadium 19.0 0.4 20.0 94.8 80-120 Zinc 21.4 0.4 20.0 107 80-120 LCS Dup(A[H0056-BSD1) Prepared&Analyzed:08/04/17 Antimony 21.0 2.0 mg/L 20.0 105 80-120 1.78 25 Arsenic 22.9 0.2 20.0 114 80-120 1.85 25 Barium 20.5 0.4 20.0 102 80-120 0.392 25 Beryllium 19.7 0.1 20.0 98.3 80-120 2.00 25 Cadmium 19.8 0.2 20.0 99.0 80-120 1.63 25 Chromium 21.0 0.2 20.0 105 80-120 1.68 25 Cobalt 19.7 1.0 20.0 98.4 80-120 1.69 25 Copper 18.5 0.4 20.0 92.4 80-120 1.53 25 Lead 19.3 0.2 20.0 96.6 80-120 1.88 25 Molybdenum 21.1 0.2 20.0 105 80-120 1.92 25 Nickel 18.9 0.2 20.0 94.6 80-120 1.92 25 Selenium 21.5 0.4 20.0 108 80-120 1.74 25 Silver 18.3 0.4 20.0 91.4 80-120 0.00 25 Thallium 18.3 0.4 20.0 91.6 80-120 1.54 25 Vanadium 19.3 0.4 20.0 96.3 80-120 1.62 25 Zinc 21.8 0.4 20.0 109 80-120 1.48 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 11 of 15