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Excelchem Environmental Labs DTE Stockton,LLC Project: Bottom Ash Truck 1 Q3 Testing 2526 W.Washington St. Project Number: 4701180998 Date Reported: Stockton,CA 95203 Project Manager: Genny Huffinan 09/17/18 20:13 STLC Metals-Quality Control Reporting Spike Source %REC RPD Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes Batch A\I0094-EPA 6010B LCS(A\I0094-BS1) Prepared&Analyzed:09/17/18 Antimony 19.4 2.0 mg/L 20.0 97.2 80-120 Arsenic 19.6 0.2 20.0 97.9 80-120 Barium 19.8 0.4 20.0 98.8 80-120 Beryllium 19.0 0.1 20.0 95.0 80-120 Cadmium 19.1 0.2 20.0 95.5 80-120 Chromium 19.4 0.2 20.0 97.1 80-120 Cobalt 19.2 1.0 20.0 95.8 80-120 Copper 19.5 0.4 20.0 97.7 80-120 Lead 19.3 0.2 20.0 96.4 80-120 Molybdenum 19.2 0.2 20.0 96.2 80-120 Nickel 19.4 0.2 20.0 96.8 80-120 Selenium 19.4 0.4 20.0 96.8 80-120 Silver 20.4 0.4 20.0 102 80-120 Thallium 19.5 0.4 20.0 97.4 80-120 Vanadium 19.8 0.4 20.0 99.1 80-120 Zinc 19.8 0.4 20.0 99.2 80-120 LCS Dup(A\10094-BSD1) Prepared&Analyzed:09/17/18 Antimony 19.7 2.0 mg/L 20.0 98.6 80-120 1.48 25 Arsenic 19.9 0.2 20.0 99.7 80-120 1.82 25 Barium 20.1 0.4 20.0 101 80-120 1.85 25 Beryllium 19.4 0.1 20.0 97.0 80-120 2.13 25 Cadmium 19.5 0.2 20.0 97.4 80-120 1.92 25 Chromium 19.8 0.2 20.0 99.2 80-120 2.14 25 Cobalt 19.5 1.0 20.0 97.6 80-120 1.86 25 Copper 20.0 0.4 20.0 100 80-120 2.28 25 Lead 19.7 0.2 20.0 98.4 80-120 2.05 25 Molybdenum 19.5 0.2 20.0 97.4 80-120 1.24 25 Nickel 19.8 0.2 20.0 99.0 80-120 2.15 25 Selenium 19.7 0.4 20.0 98.4 80-120 1.64 25 Silver 20.8 0.4 20.0 104 80-120 2.38 25 Thallium 19.8 0.4 20.0 99.0 80-120 1.53 25 Vanadium 20.3 0.4 20.0 102 80-120 2.39 25 Zinc 20.2 0.4 20.0 101 80-120 2.00 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 13 of 17