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Excelchem Environmental Labs <br /> DTE Stockton,LLC Project: Ash <br /> 2526 W.Washington St. Project Number: [none] Date Reported: <br /> Stockton,CA 95203 Project Manager: Dan Crawford 05/16/18 18:12 <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 A\E0127-EPA 6010B <br /> Blank(A\E0127-BLK1) Prepared:05/15/18 Analyzed:05/16/18 <br /> Arsenic ND 1.0 mg/kg <br /> Lead ND 1.0 " <br /> LCS(A\E0127-BS1) Prepared:05/15/18 Analyzed:05/16/18 <br /> Arsenic 96.6 1.0 mg/kg 100 96.6 80-120 <br /> Lead 101 1.0 100 101 80-120 <br /> LCS Dup(A\E0127-BSD1) Prepared:05/15/18 Analyzed:05/16/18 <br /> Arsenic 97.9 1.0 mg/kg 100 97.9 80-120 1.33 25 <br /> Lead 102 1.0 100 102 80-120 1.09 25 <br /> Matrix Spike(A\E0127-MS1) Source:1805087-01 Prepared:05/15/18 Analyzed:05/16/18 <br /> Arsenic 112 1.0 mg/kg 100 17.1 95.0 75-125 <br /> Lead 134 1.0 100 52.7 80.9 75-125 <br /> Matrix Spike Dup(A\E0127-MSD1) Source:1805087-01 Prepared:05/15/18 Analyzed:05/16/18 <br /> Arsenic 114 1.0 mg/kg 100 17.1 96.4 75-125 1.24 25 <br /> Lead 135 1.0 " 100 52.7 82.1 75-125 0.894 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 6 of 8 <br />