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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 02/19/18 19:14 STLC Metals-Quality Control Reporting Spike Source %REC RPD Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes Batch A\B0196-EPA 6010B LCS(A\B0196-BS1) Prepared&Analyzed:02/19/18 Antimony 21.7 2.0 mg/L 20.0 109 80-120 Arsenic 21.1 0.2 20.0 105 80-120 Barium 19.1 0.4 20.0 95.4 80-120 Beryllium 20.0 0.1 20.0 100 80-120 Cadmium 20.6 0.2 20.0 103 80-120 Chromium 20.8 0.2 20.0 104 80-120 Cobalt 20.7 1.0 20.0 103 80-120 Copper 19.7 0.4 20.0 98.6 80-120 Lead 20.8 0.2 20.0 104 80-120 Molybdenum 21.0 0.2 20.0 105 80-120 Nickel 20.8 0.2 20.0 104 80-120 Selenium 21.0 0.4 20.0 105 80-120 Silver 18.0 0.4 20.0 89.8 80-120 Thallium 20.8 0.4 20.0 104 80-120 Vanadium 18.9 0.4 20.0 94.3 80-120 Zinc 20.0 0.4 20.0 100 80-120 LCS Dup(A\B0196-BSD1) Prepared&Analyzed:02/19/18 Antimony 21.5 2.0 mg/L 20.0 107 80-120 1.16 25 Arsenic 20.8 0.2 20.0 104 80-120 1.58 25 Barium 19.0 0.4 20.0 95.0 80-120 0.368 25 Beryllium 19.8 0.1 20.0 98.9 80-120 1.21 25 Cadmium 20.4 0.2 20.0 102 80-120 1.37 25 Chromium 20.5 0.2 20.0 103 80-120 1.26 25 Cobalt 20.4 1.0 20.0 102 80-120 1.41 25 Copper 19.6 0.4 20.0 98.2 80-120 0.457 25 Lead 20.5 0.2 20.0 103 80-120 1.21 25 Molybdenum 20.7 0.2 20.0 103 80-120 1.25 25 Nickel 20.5 0.2 20.0 102 80-120 1.55 25 Selenium 20.8 0.4 20.0 104 80-120 1.05 25 Silver 18.2 0.4 20.0 90.8 80-120 1.16 25 Thallium 20.4 0.4 20.0 102 80-120 1.95 25 Vanadium 18.8 0.4 20.0 94.2 80-120 0.0530 25 Zinc 19.8 0.4 20.0 99.2 80-120 0.953 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 12 of 16