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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 05/24/18 11:08 <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\E0209-EPA 6010B <br /> Blank(A\E0209-BLK1) Prepared&Analyzed:05/23/18 <br /> Arsenic ND 0.2 mg/L <br /> Lead ND 0.2 " <br /> LCS(A\E0209-BS1) Prepared&Analyzed:05/23/18 <br /> Arsenic 19.4 0.2 mg/L 20.0 97.1 80-120 <br /> Lead 19.8 0.2 20.0 99.0 80-120 <br /> LCS Dup(A\E0209-BSD1) Prepared&Analyzed:05/23/18 <br /> Arsenic 19.3 0.2 mg/L 20.0 96.6 80-120 0.568 25 <br /> Lead 19.7 0.2 20.0 98.6 80-120 0.405 25 <br /> Matrix Spike(A\E0209-MS1) Source:1805138-01 Prepared&Analyzed:05/23/18 <br /> Arsenic 23.3 0.2 mg/L 20.0 2.49 104 75-125 <br /> Lead 18.8 0.2 20.0 0.384 91.9 75-125 <br /> Matrix Spike Dup(A\E0209-MSD1) Source:1805138-01 Prepared&Analyzed:05/23/18 <br /> Arsenic 22.8 0.2 mg/L 20.0 2.49 102 75-125 2.12 25 <br /> Lead 19.0 0.2 " 20.0 0.384 93.2 75-125 1.38 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 13 of 15 <br />