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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 11/13/17 17:56 STLC Metals-Quality Control Reporting Spike Source %REC RPD Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes Batch A[K0086-EPA 6010B LCS(A[K0086-BS1) Prepared&Analyzed: 11/13/17 Antimony 21.9 2.0 mg/L 20.0 110 80-120 Arsenic 21.9 0.2 20.0 110 80-120 Barium 22.4 0.4 20.0 112 80-120 Beryllium 21.7 0.1 20.0 108 80-120 Cadmium 21.5 0.2 20.0 107 80-120 Chromium 21.6 0.2 20.0 108 80-120 Cobalt 21.8 1.0 20.0 109 80-120 Copper 22.3 0.4 20.0 112 80-120 Lead 21.8 0.2 20.0 109 80-120 Molybdenum 21.3 0.2 20.0 107 80-120 Nickel 21.7 0.2 20.0 108 80-120 Selenium 22.1 0.4 20.0 110 80-120 Silver 22.9 0.4 20.0 114 80-120 Thallium 21.9 0.4 20.0 109 80-120 Vanadium 22.2 0.4 20.0 111 80-120 Zinc 21.8 0.4 20.0 109 80-120 LCS Dup(A[K0086-BSD1) Prepared&Analyzed: 11/13/17 Antimony 20.8 2.0 mg/L 20.0 104 80-120 5.48 25 Arsenic 20.8 0.2 20.0 104 80-120 5.19 25 Barium 22.4 0.4 20.0 112 80-120 0.312 25 Beryllium 20.4 0.1 20.0 102 80-120 6.04 25 Cadmium 20.3 0.2 20.0 101 80-120 5.75 25 Chromium 20.4 0.2 20.0 102 80-120 5.73 25 Cobalt 20.6 1.0 20.0 103 80-120 5.77 25 Copper 20.8 0.4 20.0 104 80-120 6.86 25 Lead 20.6 0.2 20.0 103 80-120 5.70 25 Molybdenum 20.2 0.2 20.0 101 80-120 5.44 25 Nickel 20.5 0.2 20.0 103 80-120 5.54 25 Selenium 20.8 0.4 20.0 104 80-120 6.11 25 Silver 22.7 0.4 20.0 114 80-120 0.614 25 Thallium 20.7 0.4 20.0 104 80-120 5.54 25 Vanadium 20.8 0.4 20.0 104 80-120 6.38 25 Zinc 20.8 0.4 20.0 104 80-120 4.65 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