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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 Huffman 04/12/19 16:16 <br /> Wet Chemistry-Quality Control <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch AID0113-EPA 9040B <br /> Duplicate(A]D0113-DUPl) Source:1904030-01 Prepared&Analyzed:04/12/19 <br /> pH 12.619 0.10000 pH Units 12.644 0.198 20 <br /> Duplicate(A]D0113-DUP2) Source:1904032-03 Prepared&Analyzed:04/12/19 <br /> pH 12.714 0.10000 pH Units 12.712 0.0157 20 <br /> Duplicate(A]D0113-DUP3) Source:1904034-04 Prepared&Analyzed:04/12/19 <br /> pH 12.945 0.10000 pH Units 12.947 0.0154 20 <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 7 of 18 <br />