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Excelchem Laboratories,Inc. <br /> DTE Stockton,LLC Project: 2019 Annual Bottom Ash Profiling <br /> 2526 W.Washington St. Project Number: 4701254256 Date Reported: <br /> Stockton,CA 95203 Project Manager: Genny Huffinan 04/15/19 16:48 <br /> STLC Analysis-Quality Control <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch A]D0093-EPA 6010B <br /> Blank(A]D0093-BLK1) Prepared:04/09/19 Analyzed:04/10/19 <br /> Arsenic ND 0.2 mg/L <br /> Copper ND 0.4 <br /> Lead ND 0.2 <br /> LCS(A]D0093-BSI) Prepared:04/09/19 Analyzed:04/10/19 <br /> Arsenic 20.1 0.2 mg/L 20.0 100 80-120 <br /> Copper 18.8 0.4 20.0 93.9 80-120 <br /> Lead 18.3 0.2 20.0 91.5 80-120 <br /> LCS Dup(A]D0093-BSD1) Prepared:04/09/19 Analyzed:04/10/19 <br /> Arsenic 23.6 0.2 mg/L 20.0 118 80-120 16.3 25 <br /> Copper 22.3 0.4 20.0 111 80-120 17.0 25 <br /> Lead 21.7 0.2 20.0 108 80-120 16.9 25 <br /> Matrix Spike(A]D0093-MS1) Source:1904046-03 Prepared:04/09/19 Analyzed:04/10/19 <br /> Arsenic 25.6 0.2 mg/L 20.0 1.36 121 75-125 <br /> Copper 24.8 0.4 20.0 2.04 114 80-120 <br /> Lead 22.7 0.2 20.0 0.752 110 75-125 <br /> Matrix Spike Dup(A]D0093-MSD1) Source:1904046-03 Prepared:04/09/19 Analyzed:04/10/19 <br /> Arsenic 24.8 0.2 mg/L 20.0 1.36 117 75-125 3.38 25 <br /> Copper 24.2 0.4 20.0 2.04 111 80-120 2.08 25 <br /> Lead 21.9 0.2 20.0 0.752 106 75-125 3.54 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 16 of 18 <br />