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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 11/15/17 17:58 <br /> Total Recoverable Metals-Quality Control <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch A[KO100-EPA 6010B <br /> Blank(A[KO100-BLK1) Prepared&Analyzed: 11/14/17 <br /> Arsenic ND 1.0 mg/kg <br /> Lead ND 1.0 " <br /> LCS(A[KO100-BS1) Prepared&Analyzed: 11/14/17 <br /> Arsenic 98.4 1.0 mg/kg 100 98.4 80-120 <br /> Lead 100 1.0 100 100 80-120 <br /> LCS Dup(A[KO100-BSD1) Prepared&Analyzed: 11/14/17 <br /> Arsenic 97.9 1.0 mg/kg 100 97.9 80-120 0.469 25 <br /> Lead 99.5 1.0 100 99.5 80-120 0.980 25 <br /> Matrix Spike(A[KO100-MS1) Source:1711070-01 Prepared&Analyzed: 11/14/17 <br /> Arsenic 114 1.0 mg/kg 100 18.2 95.5 75-125 <br /> Lead 111 1.0 100 33.2 77.8 75-125 <br /> Matrix Spike Dup(A[KO100-MSD1) Source:1711070-01 Prepared&Analyzed: 11/14/17 <br /> Arsenic 115 1.0 mg/kg 100 18.2 96.7 75-125 1.05 25 <br /> Lead 113 1.0 " 100 33.2 79.8 75-125 1.79 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 6 of <br />