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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 09/18/18 18:12 <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\I0110-EPA 6010B <br /> Blank(A\I0110-BLK1) Prepared&Analyzed:09/18/18 <br /> Arsenic ND 0.2 mg/L <br /> Copper ND 0.4 <br /> Lead ND 0.2 <br /> LCS(A\I0110-BS1) Prepared&Analyzed:09/18/18 <br /> Arsenic 19.2 0.2 mg/L 20.0 95.8 80-120 <br /> Copper 18.7 0.4 20.0 93.5 80-120 <br /> Lead 18.8 0.2 20.0 94.2 80-120 <br /> LCS Dup(A\10110-BSD1) Prepared&Analyzed:09/18/18 <br /> Arsenic 19.2 0.2 mg/L 20.0 96.1 80-120 0.313 25 <br /> Copper 18.8 0.4 20.0 93.8 80-120 0.320 25 <br /> Lead 19.0 0.2 20.0 95.2 80-120 1.16 25 <br /> Matrix Spike(A\10110-MS1) Source:1809067-01 Prepared&Analyzed:09/18/18 <br /> Arsenic 22.6 0.2 mg/L 20.0 0.154 112 75-125 <br /> Copper 21.7 0.4 20.0 2.18 97.7 80-120 <br /> Lead 18.2 0.2 20.0 0.0138 90.7 75-125 <br /> Matrix Spike Dup(A\10110-MSD1) Source:1809067-01 Prepared&Analyzed:09/18/18 <br /> Arsenic 22.5 0.2 mg/L 20.0 0.154 112 75-125 0.400 25 <br /> Copper 21.5 0.4 20.0 2.18 96.6 80-120 1.02 25 <br /> Lead 18.2 0.2 20.0 0.0138 90.8 75-125 0.0551 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 16 of 18 <br />