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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 06/12/18 17:39 STLC Metals-Quality Control Reporting Spike Source %REC RPD Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes Batch AT0086-EPA 6010B LCS(A\F0086-BS1) Prepared:06/11/18 Analyzed:06/12/18 Antimony 20.4 2.0 mg/L 20.0 102 80-120 Arsenic 20.5 0.2 20.0 102 80-120 Barium 20.1 0.4 20.0 101 80-120 Beryllium 19.9 0.1 20.0 99.6 80-120 Cadmium 19.8 0.2 20.0 98.8 80-120 Chromium 20.3 0.2 20.0 102 80-120 Cobalt 19.8 1.0 20.0 99.2 80-120 Copper 19.5 0.4 20.0 97.6 80-120 Lead 19.8 0.2 20.0 98.9 80-120 Molybdenum 20.1 0.2 20.0 100 80-120 Nickel 20.1 0.2 20.0 100 80-120 Selenium 20.1 0.4 20.0 100 80-120 Silver 19.4 0.4 20.0 96.8 80-120 Thallium 20.2 0.4 20.0 101 80-120 Vanadium 19.5 0.4 20.0 97.4 80-120 Zinc 20.5 0.4 20.0 102 80-120 LCS Dup(A\F0086-BSD1) Prepared:06/11/18 Analyzed:06/12/18 Antimony 20.3 2.0 mg/L 20.0 101 80-120 0.639 25 Arsenic 20.3 0.2 20.0 102 80-120 0.980 25 Barium 20.3 0.4 20.0 102 80-120 0.939 25 Beryllium 19.8 0.1 20.0 98.9 80-120 0.705 25 Cadmium 19.6 0.2 20.0 98.2 80-120 0.660 25 Chromium 20.1 0.2 20.0 101 80-120 0.940 25 Cobalt 19.7 1.0 20.0 98.7 80-120 0.556 25 Copper 19.5 0.4 20.0 97.4 80-120 0.256 25 Lead 19.7 0.2 20.0 98.4 80-120 0.558 25 Molybdenum 19.9 0.2 20.0 99.6 80-120 0.650 25 Nickel 20.0 0.2 20.0 99.8 80-120 0.699 25 Selenium 19.9 0.4 20.0 99.7 80-120 0.650 25 Silver 19.6 0.4 20.0 97.9 80-120 1.08 25 Thallium 20.1 0.4 20.0 100 80-120 0.695 25 Vanadium 19.3 0.4 20.0 96.6 80-120 0.876 25 Zinc 20.4 0.4 20.0 102 80-120 0.342 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