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Excelchem Environmental Labs <br /> DTE Stockton,LLC Project: Ash <br /> 2526 W.Washington St. Project Number: [none] Date Reported: <br /> Stockton,CA 95203 Project Manager: Dan Crawford 05/17/18 18:09 <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\E0144-EPA 6010B <br /> Blank(A\E0144-BLK1) Prepared&Analyzed:05/17/18 <br /> Arsenic ND 0.2 mg/L <br /> Lead ND 0.2 " <br /> LCS(A\E0144-BS1) Prepared&Analyzed:05/17/18 <br /> Arsenic 19.6 0.2 mg/L 20.0 98.2 80-120 <br /> Lead 19.8 0.2 20.0 99.2 80-120 <br /> LCS Dup(A\E0144-BSD1) Prepared&Analyzed:05/17/18 <br /> Arsenic 19.4 0.2 mg/L 20.0 97.2 80-120 1.07 25 <br /> Lead 19.7 0.2 20.0 98.4 80-120 0.911 25 <br /> Matrix Spike(A\E0144-MS1) Source:1804163-01 Prepared&Analyzed:05/17/18 <br /> Arsenic 21.0 0.2 mg/L 20.0 ND 105 75-125 <br /> Lead 18.3 0.2 20.0 ND 91.4 75-125 <br /> Matrix Spike Dup(A\E0144-MSD1) Source:1804163-01 Prepared&Analyzed:05/17/18 <br /> Arsenic 21.0 0.2 mg/L 20.0 ND 105 75-125 0.143 25 <br /> Lead 18.2 0.2 " 20.0 ND 91.2 75-125 0.164 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 14 of 16 <br />