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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 02/22/18 17:20 <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\B0230-EPA 6010B <br /> Blank(A\B0230-BLK1) Prepared&Analyzed:02/22/18 <br /> Arsenic ND 0.2 mg/L <br /> Copper ND 0.4 <br /> Lead ND 0.2 <br /> LCS(A\B0230-BS1) Prepared&Analyzed:02/22/18 <br /> Arsenic 20.0 0.2 mg/L 20.0 100 80-120 <br /> Copper 20.6 0.4 20.0 103 80-120 <br /> Lead 20.2 0.2 20.0 101 80-120 <br /> LCS Dup(A\B0230-BSD1) Prepared&Analyzed:02/22/18 <br /> Arsenic 20.2 0.2 mg/L 20.0 101 80-120 0.646 25 <br /> Copper 20.2 0.4 20.0 101 80-120 1.86 25 <br /> Lead 20.1 0.2 20.0 101 80-120 0.347 25 <br /> Matrix Spike(A\B0230-MS1) Source:1802153-01 Prepared&Analyzed:02/22/18 <br /> Arsenic 22.3 0.2 mg/L 20.0 0.0949 111 75-125 <br /> Copper 19.4 0.4 20.0 0.944 92.3 80-120 <br /> Lead 18.5 0.2 20.0 0.0602 92.1 75-125 <br /> Matrix Spike Dup(A\B0230-MSD1) Source:1802153-01 Prepared&Analyzed:02/22/18 <br /> Arsenic 22.0 0.2 mg/L 20.0 0.0949 110 75-125 1.13 25 <br /> Copper 19.3 0.4 20.0 0.944 92.0 80-120 0.361 25 <br /> Lead 18.5 0.2 20.0 0.0602 92.0 75-125 0.0541 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 7 of <br />