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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 08/14/17 17:46 STLC Metals-Quality Control Reporting Spike Source %REC RPD Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes Batch A[H0138-EPA 6010B LCS(A[H0138-BS1) Prepared&Analyzed:08/14/17 Antimony 20.8 2.0 mg/L 20.0 104 80-120 Arsenic 22.3 0.2 20.0 112 80-120 Barium 20.5 0.4 20.0 103 80-120 Beryllium 21.5 0.1 20.0 108 80-120 Cadmium 20.3 0.2 20.0 101 80-120 Chromium 20.9 0.2 20.0 104 80-120 Cobalt 19.8 1.0 20.0 99.2 80-120 Copper 18.8 0.4 20.0 94.0 80-120 Lead 19.2 0.2 20.0 95.8 80-120 Molybdenum 21.2 0.2 20.0 106 80-120 Nickel 19.3 0.2 20.0 96.4 80-120 Selenium 22.2 0.4 20.0 111 80-120 Silver 19.0 0.4 20.0 94.8 80-120 Thallium 18.1 0.4 20.0 90.7 80-120 Vanadium 19.8 0.4 20.0 98.8 80-120 Zinc 20.3 0.4 20.0 101 80-120 LCS Dup(A[H0138-BSD1) Prepared&Analyzed:08/14/17 Antimony 20.8 2.0 mg/L 20.0 104 80-120 0.241 25 Arsenic 22.2 0.2 20.0 111 80-120 0.359 25 Barium 20.5 0.4 20.0 102 80-120 0.195 25 Beryllium 21.5 0.1 20.0 108 80-120 0.186 25 Cadmium 20.2 0.2 20.0 101 80-120 0.197 25 Chromium 20.8 0.2 20.0 104 80-120 0.144 25 Cobalt 19.8 1.0 20.0 99.0 80-120 0.151 25 Copper 18.9 0.4 20.0 94.4 80-120 0.371 25 Lead 19.2 0.2 20.0 95.8 80-120 0.104 25 Molybdenum 21.2 0.2 20.0 106 80-120 0.0942 25 Nickel 19.2 0.2 20.0 96.2 80-120 0.156 25 Selenium 22.2 0.4 20.0 111 80-120 0.0902 25 Silver 19.1 0.4 20.0 95.3 80-120 0.473 25 Thallium 18.2 0.4 20.0 91.0 80-120 0.275 25 Vanadium 19.9 0.4 20.0 99.4 80-120 0.606 25 Zinc 20.3 0.4 20.0 101 80-120 0.148 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