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Excelchem Environmental Labs <br /> DTE Stockton,LLC Project: Bottom Ash Truck 1 Q3 Testing <br /> 2526 W.Washington St. Project Number: 4701180998 Date Reported: <br /> Stockton,CA 95203 Project Manager: Genny Huffman 09/17/18 20:13 <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\I0094-EPA 6010B <br /> Blank(A\I0094-BLK1) Prepared&Analyzed:09/17/18 <br /> Arsenic ND 0.2 mg/L <br /> Copper ND 0.4 <br /> Lead ND 0.2 <br /> LCS(A\10094-BSI) Prepared&Analyzed:09/17/18 <br /> Arsenic 19.6 0.2 mg/L 20.0 97.9 80-120 <br /> Copper 19.5 0.4 20.0 97.7 80-120 <br /> Lead 19.3 0.2 20.0 96.4 80-120 <br /> LCS Dup(A\10094-BSD1) Prepared&Analyzed:09/17/18 <br /> Arsenic 19.9 0.2 mg/L 20.0 99.7 80-120 1.82 25 <br /> Copper 20.0 0.4 20.0 100 80-120 2.28 25 <br /> Lead 19.7 0.2 20.0 98.4 80-120 2.05 25 <br /> Matrix Spike(A\10094-MS1) Source:1809068-02 Prepared&Analyzed:09/17/18 <br /> Arsenic 22.8 0.2 mg/L 20.0 0.337 112 75-125 <br /> Copper 21.9 0.4 20.0 2.39 97.7 80-120 <br /> Lead 18.4 0.2 20.0 ND 92.1 75-125 <br /> Matrix Spike Dup(A\10094-MSD1) Source:1809068-02 Prepared&Analyzed:09/17/18 <br /> Arsenic 22.3 0.2 mg/L 20.0 0.337 110 75-125 2.31 25 <br /> Copper 21.6 0.4 20.0 2.39 95.9 80-120 1.61 25 <br /> Lead 18.0 0.2 20.0 ND 89.8 75-125 2.53 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 15 of 17 <br />