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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 19:07 STLC Metals-Quality Control Reporting Spike Source %REC RPD Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes Batch A\I0093-EPA 6010B LCS(A\I0093-BS1) Prepared&Analyzed:09/17/18 Antimony 19.6 2.0 mg/L 20.0 98.2 80-120 Arsenic 19.9 0.2 20.0 99.4 80-120 Barium 20.1 0.4 20.0 100 80-120 Beryllium 19.4 0.1 20.0 97.0 80-120 Cadmium 19.5 0.2 20.0 97.4 80-120 Chromium 19.8 0.2 20.0 98.8 80-120 Cobalt 19.5 1.0 20.0 97.6 80-120 Copper 20.0 0.4 20.0 99.8 80-120 Lead 19.6 0.2 20.0 98.2 80-120 Molybdenum 19.5 0.2 20.0 97.7 80-120 Nickel 19.7 0.2 20.0 98.6 80-120 Selenium 19.4 0.4 20.0 97.1 80-120 Silver 21.0 0.4 20.0 105 80-120 Thallium 19.8 0.4 20.0 98.8 80-120 Vanadium 20.4 0.4 20.0 102 80-120 Zinc 20.1 0.4 20.0 101 80-120 LCS Dup(A\10093-BSD1) Prepared&Analyzed:09/17/18 Antimony 19.5 2.0 mg/L 20.0 97.6 80-120 0.613 25 Arsenic 19.8 0.2 20.0 99.0 80-120 0.454 25 Barium 19.5 0.4 20.0 97.6 80-120 2.78 25 Beryllium 19.3 0.1 20.0 96.4 80-120 0.569 25 Cadmium 19.4 0.2 20.0 96.8 80-120 0.515 25 Chromium 19.6 0.2 20.0 98.2 80-120 0.711 25 Cobalt 19.4 1.0 20.0 97.1 80-120 0.565 25 Copper 19.9 0.4 20.0 99.6 80-120 0.150 25 Lead 19.5 0.2 20.0 97.6 80-120 0.613 25 Molybdenum 19.4 0.2 20.0 97.1 80-120 0.616 25 Nickel 19.6 0.2 20.0 97.8 80-120 0.764 25 Selenium 19.2 0.4 20.0 96.2 80-120 0.879 25 Silver 20.4 0.4 20.0 102 80-120 2.95 25 Thallium 19.7 0.4 20.0 98.6 80-120 0.101 25 Vanadium 20.2 0.4 20.0 101 80-120 1.04 25 Zinc 20.1 0.4 20.0 101 80-120 0.00 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