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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 17:09 STLC Metals-Quality Control Reporting Spike Source %REC RPD Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes Batch A\I0086-EPA 6010B LCS(A\I0086-BS1) Prepared:09/13/18 Analyzed:09/14/18 Antimony 19.3 2.0 mg/L 20.0 96.6 80-120 Arsenic 19.1 0.2 20.0 95.4 80-120 Barium 18.7 0.4 20.0 93.4 80-120 Beryllium 18.6 0.1 20.0 92.8 80-120 Cadmium 19.5 0.2 20.0 97.6 80-120 Chromium 19.6 0.2 20.0 98.0 80-120 Cobalt 19.6 1.0 20.0 98.2 80-120 Copper 19.4 0.4 20.0 97.0 80-120 Lead 19.7 0.2 20.0 98.6 80-120 Molybdenum 19.3 0.2 20.0 96.7 80-120 Nickel 19.6 0.2 20.0 98.2 80-120 Selenium 18.8 0.4 20.0 94.0 80-120 Silver 20.4 0.4 20.0 102 80-120 Thallium 19.5 0.4 20.0 97.6 80-120 Vanadium 20.3 0.4 20.0 102 80-120 Zinc 20.3 0.4 20.0 102 80-120 LCS Dup(A\10086-BSD1) Prepared:09/13/18 Analyzed:09/14/18 Antimony 18.8 2.0 mg/L 20.0 93.8 80-120 2.99 25 Arsenic 18.5 0.2 20.0 92.6 80-120 2.98 25 Barium 18.5 0.4 20.0 92.7 80-120 0.699 25 Beryllium 18.0 0.1 20.0 90.1 80-120 2.90 25 Cadmium 19.0 0.2 20.0 94.8 80-120 2.81 25 Chromium 19.0 0.2 20.0 95.2 80-120 2.85 25 Cobalt 19.1 1.0 20.0 95.5 80-120 2.84 25 Copper 18.9 0.4 20.0 94.6 80-120 2.56 25 Lead 19.2 0.2 20.0 95.8 80-120 2.88 25 Molybdenum 18.8 0.2 20.0 94.0 80-120 2.83 25 Nickel 19.1 0.2 20.0 95.5 80-120 2.84 25 Selenium 18.3 0.4 20.0 91.3 80-120 2.97 25 Silver 20.2 0.4 20.0 101 80-120 0.789 25 Thallium 19.0 0.4 20.0 94.8 80-120 2.86 25 Vanadium 19.7 0.4 20.0 98.6 80-120 3.00 25 Zinc 20.2 0.4 20.0 101 80-120 0.593 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