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Excelchem Environmental Labs <br /> DTE Stockton,LLC Project: Ash <br /> 2526 W.Washington St. Project Number: #4701180998 Date Reported: <br /> Stockton,CA 95203 Project Manager: Dan Crawford 06/08/18 16:00 <br /> Total Recoverable Metals-Quality Control <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch AW0047-EPA 6010B <br /> Blank(A\F0047-BLK1) Prepared:06/06/18 Analyzed:06/07/18 <br /> Arsenic ND 1.0 mg/kg <br /> Copper ND 2.0 <br /> Lead ND 1.0 <br /> LCS(A\F0047-BS1) Prepared:06/06/18 Analyzed:06/07/18 <br /> Arsenic 99.4 1.0 mg/kg 100 99.4 80-120 <br /> Copper 98.0 2.0 100 98.0 80-120 <br /> Lead 98.0 1.0 100 98.0 80-120 <br /> LCS Dup(A\F0047-BSD1) Prepared:06/06/18 Analyzed:06/07/18 <br /> Arsenic 101 1.0 mg/kg 100 101 80-120 1.20 25 <br /> Copper 99.9 2.0 100 99.9 80-120 1.90 25 <br /> Lead 99.2 1.0 100 99.2 80-120 1.24 25 <br /> Matrix Spike(A\F0047-MS1) Source:1806019-01 Prepared:06/06/18 Analyzed:06/07/18 <br /> Arsenic 105 1.0 mg/kg 100 6.97 97.8 75-125 <br /> Copper 213 2.0 100 110 103 75-125 <br /> Lead 92.2 1.0 100 13.6 78.6 75-125 <br /> Matrix Spike Dup(A\F0047-MSD1) Source:1806019-01 Prepared:06/06/18 Analyzed:06/07/18 <br /> Arsenic 107 1.0 mg/kg 100 6.97 99.9 75-125 1.98 25 <br /> Copper 190 2.0 100 110 80.2 75-125 11.2 25 <br /> Lead 91.9 1.0 100 13.6 78.3 75-125 0.337 25 <br /> Excelchem Environmental Lab. The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document.This analytical report must be reproduced in its entirety. <br /> Laboratory Representative Page 4of7 <br />