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Excelchem Environmental Labs DTE Stockton,LLC Project: Ash 2526 W.Washington St. Project Number: #4701180998 Date Reported: Stockton,CA 95203 Project Manager: Dan Crawford 02/21/18 17:33 STLC Metals-Quality Control Reporting Spike Source %REC RPD Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes Batch A\B0223-EPA 6010B LCS(A\B0223-BS1) Prepared&Analyzed:02/21/18 Antimony 21.0 2.0 mg/L 20.0 105 80-120 Arsenic 20.5 0.2 20.0 102 80-120 Barium 20.4 0.4 20.0 102 80-120 Beryllium 20.0 0.1 20.0 100 80-120 Cadmium 20.4 0.2 20.0 102 80-120 Chromium 20.3 0.2 20.0 102 80-120 Cobalt 20.5 1.0 20.0 103 80-120 Copper 20.0 0.4 20.0 100 80-120 Lead 20.5 0.2 20.0 102 80-120 Molybdenum 20.3 0.2 20.0 102 80-120 Nickel 20.6 0.2 20.0 103 80-120 Selenium 20.3 0.4 20.0 101 80-120 Silver 19.6 0.4 20.0 98.2 80-120 Thallium 20.7 0.4 20.0 104 80-120 Vanadium 19.9 0.4 20.0 99.6 80-120 Zinc 20.0 0.4 20.0 100 80-120 LCS Dup(A\B0223-BSD1) Prepared&Analyzed:02/21/18 Antimony 21.1 2.0 mg/L 20.0 105 80-120 0.380 25 Arsenic 20.5 0.2 20.0 102 80-120 0.0488 25 Barium 20.4 0.4 20.0 102 80-120 0.343 25 Beryllium 20.0 0.1 20.0 100 80-120 0.00 25 Cadmium 20.4 0.2 20.0 102 80-120 0.0489 25 Chromium 20.4 0.2 20.0 102 80-120 0.246 25 Cobalt 20.5 1.0 20.0 102 80-120 0.0976 25 Copper 20.1 0.4 20.0 101 80-120 0.398 25 Lead 20.5 0.2 20.0 102 80-120 0.0488 25 Molybdenum 20.4 0.2 20.0 102 80-120 0.687 25 Nickel 20.5 0.2 20.0 103 80-120 0.195 25 Selenium 20.4 0.4 20.0 102 80-120 0.640 25 Silver 19.7 0.4 20.0 98.6 80-120 0.407 25 Thallium 20.5 0.4 20.0 102 80-120 1.12 25 Vanadium 19.7 0.4 20.0 98.7 80-120 0.908 25 Zinc 20.0 0.4 20.0 99.8 80-120 0.250 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