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Excelchem Environmental Labs DTE Stockton,LLC Project: Ash 2526 W.Washington St. Project Number: 4701052861 Date Reported: Stockton,CA 95203 Project Manager: Dan Crawford 11/16/17 18:05 STLC Metals-Quality Control Reporting Spike Source %REC RPD Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes Batch A[K0135-EPA 6010B LCS(A[K0135-BS1) Prepared&Analyzed: 11/16/17 Antimony 20.3 2.0 mg/L 20.0 102 80-120 Arsenic 19.8 0.2 20.0 98.8 80-120 Barium 21.1 0.4 20.0 106 80-120 Beryllium 20.0 0.1 20.0 100 80-120 Cadmium 20.0 0.2 20.0 99.8 80-120 Chromium 19.6 0.2 20.0 97.9 80-120 Cobalt 20.3 1.0 20.0 102 80-120 Copper 20.2 0.4 20.0 101 80-120 Lead 20.2 0.2 20.0 101 80-120 Molybdenum 19.3 0.2 20.0 96.4 80-120 Nickel 19.6 0.2 20.0 98.2 80-120 Selenium 19.9 0.4 20.0 99.4 80-120 Silver 20.8 0.4 20.0 104 80-120 Thallium 19.6 0.4 20.0 98.1 80-120 Vanadium 20.4 0.4 20.0 102 80-120 Zinc 19.8 0.4 20.0 99.0 80-120 LCS Dup(A[K0135-BSD1) Prepared&Analyzed: 11/16/17 Antimony 19.2 2.0 mg/L 20.0 96.1 80-120 5.56 25 Arsenic 18.7 0.2 20.0 93.7 80-120 5.30 25 Barium 21.0 0.4 20.0 105 80-120 0.664 25 Beryllium 18.9 0.1 20.0 94.6 80-120 5.60 25 Cadmium 18.9 0.2 20.0 94.6 80-120 5.35 25 Chromium 18.5 0.2 20.0 92.7 80-120 5.46 25 Cobalt 19.2 1.0 20.0 95.9 80-120 5.67 25 Copper 19.2 0.4 20.0 95.8 80-120 5.19 25 Lead 19.1 0.2 20.0 95.6 80-120 5.40 25 Molybdenum 18.4 0.2 20.0 91.8 80-120 4.99 25 Nickel 18.6 0.2 20.0 93.0 80-120 5.49 25 Selenium 18.8 0.4 20.0 93.9 80-120 5.64 25 Silver 20.9 0.4 20.0 105 80-120 0.575 25 Thallium 18.6 0.4 20.0 93.0 80-120 5.28 25 Vanadium 19.3 0.4 20.0 96.4 80-120 5.60 25 Zinc 19.0 0.4 20.0 94.9 80-120 4.28 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