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Excelchem Laboratories, Inc. <br />Arcadis Project: Stockton transformer <br />101 Creeksdie Ridge Court Suite 200 <br /> <br />Project Number: 30101128.0002 <br />Date Reported: <br />Rio Oso, CA 95678 <br /> <br />Project Manager: Drew Feucht <br />08/23/21 14:28 <br />PCBs by GC/ECD - Quality Control <br />Analyte Result <br />Reporting <br />Units <br />Spike Source %REC <br />Level Result %REC Limits RPD <br />RPD <br />Limit Notes <br />Batch A H0132 - PCBs BY EPA 8082 <br />LCS (A_H0132-BS1) Prepared: 08/18/21 Analyzed: 08/19/21 <br />Surrogate: Decachlorobiphenyl 0.0165 mg/kg 0.0200 82.6 50-150 <br />Surrogate: Tetrachloro-meta-xylene 0.0129 0.0200 64.3 50-150 <br />Aroclor 1260 <br />LCS Dup (A_H0132-BSD1) <br />0.715 0.0500 1.00 71.5 50-150 <br />Prepared: 08/18/21 Analyzed: 08/19/21 <br />Surrogate: Decachlorobiphenyl 0.0167 mg/kg 0.0200 83.3 50-150 <br />Surrogate: Tetrachloro-meta-xylene 0.0133 0.0200 66.7 50-150 <br />Aroclor 1260 <br />Matrix Spike (A_H0132-MS1) <br />0.736 0.0500 <br />Source: 2108066-06 <br />1.00 73.6 50-150 <br />Prepared: 08/18/21 Analyzed: 08/19/21 <br />2.89 50 <br />Surrogate: Decachlorobiphenyl 0.0167 mg/kg 0.0200 83.3 50-150 <br />Surrogate: Tetrachloro-meta-xylene 0.0133 0.0200 66.4 50-150 <br />Aroclor 1260 <br />Matrix Spike Dup (A J10132-MSD1) <br />0.735 0.0500 <br />Source: 2108066-06 <br />1.00 ND 73.5 50-150 <br />Prepared: 08/18/21 Analyzed: 08/19/21 <br />Surrogate: Decachlorobiphenyl 0.0176 mg kg 0.0200 87.9 50-150 <br />Surrogate: Tetrachloro-meta-xylene 0.0142 0.0200 71.1 50-150 <br />Aroclor 1260 <br />Batch A H0170 - PCBs BY EPA 8082 <br />0.755 0.0500 1.00 ND 75.5 50-150 2.68 50 <br />Blank (A_H0170-BLK1) Prepared: 08/18/21 Analyzed: 08/20/21 <br />Surrogate: Decachlorobiphenyl 0.0139 mg/kg 0.0200 69.4 50-150 <br />Surrogate: Tetrachloro-meta-zylene 0.0126 0.0200 63.1 50-150 <br />Aroclor 1016 <br />Aroclor 1221 <br />Aroclor 1232 <br />Aroclor 1242 <br />Aroclor 1248 <br />Aroclor 1254 <br />Aroclor 1260 <br />ND <br />ND <br />ND <br />ND <br />ND <br />ND <br />ND <br />0.0500 <br />0.0500 <br />0.0500 <br />0.0500 <br />0.0500 <br />0.0500 <br />0.0500 <br />Excelchem Laboratories. Inc. <br /> <br />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 entirely. <br /> <br />Laboratory Representative Page 27 of 31