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Excelchem Laboratories,Inc. <br /> DTE Stockton,LLC Project: 2019 Annual Fly Ash Profiling <br /> 2526 W.Washington St. Project Number: 4701254256 Date Reported: <br /> Stockton,CA 95203 Project Manager: Genny Huffinan 04/12/19 16:16 <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]D0092-EPA 6010B <br /> Blank(A]D0092-BLK1) Prepared:04/09/19 Analyzed:04/10/19 <br /> Arsenic ND 0.2 mg/L <br /> Lead ND 0.2 " <br /> LCS(A]D0092-BSI) Prepared:04/09/19 Analyzed:04/10/19 <br /> Arsenic 21.7 0.2 mg/L 20.0 109 80-120 <br /> Lead 18.4 0.2 20.0 91.9 80-120 <br /> LCS Dup(A]D0092-BSD1) Prepared:04/09/19 Analyzed:04/10/19 <br /> Arsenic 21.6 0.2 mg/L 20.0 108 80-120 0.415 25 <br /> Lead 18.3 0.2 20.0 91.6 80-120 0.327 25 <br /> Matrix Spike(A]D0092-MS1) Source:1904030-03 Prepared:04/09/19 Analyzed:04/10/19 <br /> Arsenic 21.4 0.2 mg/L 20.0 0.322 106 75-125 <br /> Lead 18.2 0.2 20.0 0.120 90.2 75-125 <br /> Matrix Spike Dup(A]D0092-MSD1) Source:1904030-03 Prepared:04/09/19 Analyzed:04/10/19 <br /> Arsenic 22.5 0.2 mg/L 20.0 0.322 111 75-125 4.78 25 <br /> Lead 18.9 0.2 " 20.0 0.120 93.9 75-125 4.05 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 />