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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 05/24/18 11:08 STLC Metals-Quality Control Reporting Spike Source %REC RPD Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes Batch A\E0209-EPA 6010B LCS(A\E0209-BS1) Prepared&Analyzed:05/23/18 Antimony 19.9 2.0 mg/L 20.0 99.4 80-120 Arsenic 19.4 0.2 20.0 97.1 80-120 Barium 19.6 0.4 20.0 98.1 80-120 Beryllium 19.2 0.1 20.0 95.8 80-120 Cadmium 19.5 0.2 20.0 97.6 80-120 Chromium 19.2 0.2 20.0 96.0 80-120 Cobalt 19.4 1.0 20.0 97.0 80-120 Copper 19.2 0.4 20.0 95.8 80-120 Lead 19.8 0.2 20.0 99.0 80-120 Molybdenum 19.9 0.2 20.0 99.4 80-120 Nickel 19.6 0.2 20.0 98.1 80-120 Selenium 19.4 0.4 20.0 97.2 80-120 Silver 19.3 0.4 20.0 96.3 80-120 Thallium 19.9 0.4 20.0 99.6 80-120 Vanadium 18.4 0.4 20.0 92.0 80-120 Zinc 19.6 0.4 20.0 97.8 80-120 LCS Dup(A\E0209-BSD1) Prepared&Analyzed:05/23/18 Antimony 19.9 2.0 mg/L 20.0 99.7 80-120 0.301 25 Arsenic 19.3 0.2 20.0 96.6 80-120 0.568 25 Barium 19.5 0.4 20.0 97.6 80-120 0.460 25 Beryllium 19.1 0.1 20.0 95.6 80-120 0.313 25 Cadmium 19.4 0.2 20.0 97.2 80-120 0.411 25 Chromium 19.2 0.2 20.0 96.0 80-120 0.00 25 Cobalt 19.4 1.0 20.0 97.0 80-120 0.0515 25 Copper 19.2 0.4 20.0 96.0 80-120 0.208 25 Lead 19.7 0.2 20.0 98.6 80-120 0.405 25 Molybdenum 19.7 0.2 20.0 98.6 80-120 0.707 25 Nickel 19.6 0.2 20.0 98.1 80-120 0.00 25 Selenium 19.5 0.4 20.0 97.6 80-120 0.462 25 Silver 19.5 0.4 20.0 97.4 80-120 1.14 25 Thallium 19.9 0.4 20.0 99.6 80-120 0.00 25 Vanadium 18.6 0.4 20.0 93.2 80-120 1.30 25 Zinc 19.5 0.4 20.0 97.4 80-120 0.359 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