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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 06/07/18 16:27 STLC Metals-Quality Control Reporting Spike Source %REC RPD Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes Batch AT0044-EPA 6010B LCS(A\F0044-BS1) Prepared&Analyzed:06/06/18 Antimony 20.0 2.0 mg/L 20.0 100 80-120 Arsenic 19.5 0.2 20.0 97.7 80-120 Barium 19.9 0.4 20.0 99.4 80-120 Beryllium 19.3 0.1 20.0 96.7 80-120 Cadmium 19.8 0.2 20.0 99.2 80-120 Chromium 19.8 0.2 20.0 99.0 80-120 Cobalt 19.8 1.0 20.0 99.2 80-120 Copper 20.1 0.4 20.0 101 80-120 Lead 19.9 0.2 20.0 99.7 80-120 Molybdenum 19.9 0.2 20.0 99.7 80-120 Nickel 19.8 0.2 20.0 98.8 80-120 Selenium 19.3 0.4 20.0 96.5 80-120 Silver 20.0 0.4 20.0 99.9 80-120 Thallium 20.3 0.4 20.0 102 80-120 Vanadium 19.8 0.4 20.0 98.8 80-120 Zinc 19.6 0.4 20.0 98.2 80-120 LCS Dup(A\F0044-BSD1) Prepared&Analyzed:06/06/18 Antimony 20.0 2.0 mg/L 20.0 100 80-120 0.00 25 Arsenic 19.5 0.2 20.0 97.4 80-120 0.308 25 Barium 19.8 0.4 20.0 99.2 80-120 0.201 25 Beryllium 19.3 0.1 20.0 96.6 80-120 0.103 25 Cadmium 19.8 0.2 20.0 99.2 80-120 0.0504 25 Chromium 19.8 0.2 20.0 99.0 80-120 0.0505 25 Cobalt 19.8 1.0 20.0 99.1 80-120 0.151 25 Copper 20.4 0.4 20.0 102 80-120 1.58 25 Lead 20.0 0.2 20.0 99.8 80-120 0.150 25 Molybdenum 19.9 0.2 20.0 99.7 80-120 0.00 25 Nickel 19.8 0.2 20.0 98.8 80-120 0.0506 25 Selenium 19.3 0.4 20.0 96.4 80-120 0.156 25 Silver 20.3 0.4 20.0 101 80-120 1.54 25 Thallium 20.4 0.4 20.0 102 80-120 0.197 25 Vanadium 20.1 0.4 20.0 100 80-120 1.56 25 Zinc 19.8 0.4 20.0 98.8 80-120 0.508 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 10 of 14