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Excelchem Environmental Labs <br /> DTE Stockton,LLC Project: Ash <br /> 2526 W.Washington St. Project Number: 4701052861 Date Reported: <br /> Stockton,CA 95203 Project Manager: Dan Crawford 11/13/17 17:56 <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[K0086-EPA 6010B <br /> Blank(A[K0086-BLK1) Prepared&Analyzed: 11/13/17 <br /> Arsenic ND 0.2 mg/L <br /> Lead ND 0.2 " <br /> LCS(A[K0086-BS1) Prepared&Analyzed:11/13/17 <br /> Arsenic 21.9 0.2 mg/L 20.0 110 80-120 <br /> Lead 21.8 0.2 20.0 109 80-120 <br /> LCS Dup(A[K0086-BSD1) Prepared&Analyzed: 11/13/17 <br /> Arsenic 20.8 0.2 mg/L 20.0 104 80-120 5.19 25 <br /> Lead 20.6 0.2 20.0 103 80-120 5.70 25 <br /> Matrix Spike(A[K0086-MS1) Source:1711051-01 Prepared&Analyzed: 11/13/17 <br /> Arsenic 24.2 0.2 mg/L 20.0 1.13 115 75-125 <br /> Lead 20.5 0.2 20.0 0.348 101 75-125 <br /> Matrix Spike Dup(A[K0086-MSD1) Source:1711051-01 Prepared&Analyzed:11/13/17 <br /> Arsenic 24.3 0.2 mg/L 20.0 1.13 116 75-125 0.330 25 <br /> Lead 20.6 0.2 " 20.0 0.348 101 75-125 0.437 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 />