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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 08/23/21 14:28 <br />PCBs by GC/ECD - Quality Control <br /> <br />Analyte R ; g <br />Spike Source %REC <br />Level Result %REC Limits RPD RPD Result ?imi Units Limit Notes <br /> <br />Batch A 110170 - PCBs BY EPA 8082 <br /> <br />LCS (A_H0170-BSI) <br /> Prepared: 08/18/21 Analyzed: 08/19/21 <br /> <br />Surrogate: Decachlorobiphenyl 0.0169 mg/kg 0.0200 84.7 50-150 <br /> <br />Surrogate: Tetrachloro-meta-xylene 0.0140 0.0200 69.8 50-150 <br /> <br />Aroclor 1260 0.731 0.0500 1.00 73.1 50-150 <br />LCS Dup (A_H0170-BSD1) <br /> Prepared: 08/18/21 Analyzed: 08/19/21 <br /> <br />Surrogate: Decachlorobiphenyl 0.0167 mg/kg 0.0200 83.4 50-150 <br /> <br />Surrogate: Tetrachloro-meta-xylene 0.0139 0.0200 69.6 50-150 <br /> <br />Aroclor 1260 0.714 0.0500 1.00 71.4 50-150 2.35 50 <br />Matrix Spike (A_H0170-MS1) <br /> <br />Source: 2108096-18 Prepared: 08/18/21 Analyzed: 08/20/21 <br /> <br />Surrogate: Decachlorobiphenyl 0.0537 mg/kg 0.274 19.6 50-150 S-06 <br /> <br />Surrogate: Tetrachloro-meta-xylene 0.0526 <br /> 0.274 19.2 50-150 8-06 <br /> <br />Aroclor 1260 1.84 0.685 13.7 ND 13.4 50-150 QM-01 <br />Matrix Spike Dup (A_H0170-MSD1) <br /> Source: 2108096-18 Prepared: 08/18/21 Analyzed: 08/20/21 <br /> <br />Surrogate: Decachlorobiphenyl 0.0502 mg kg 0.301 16.7 50-150 S-06 <br /> <br />Surrogate: Tetrachloro-meta-xylene 0.0433 0.301 14.4 50-150 S-06 <br /> <br />Aroclor 1260 1.53 0.752 15.0 ND 10.2 50-150 17.9 50 QM-01 <br />Batch A 110184- PCBs BY EPA 8082 <br /> <br />Blank (A_H0184-BLK1) <br /> Prepared & Analyzed: 08/20/21 <br /> <br />Surrogate: Decachlorobiphenyl 297 ug Wipe 400 74.3 50-150 <br /> <br />Aroclor 1016 ND 1.00 <br />Aroclor 1221 ND 1.00 <br />Aroclor 1232 ND 1.00 <br />Aroclor 1242 ND 1.00 <br />Aroclor 1248 ND 1.00 <br />Aroclor 1254 ND 1.00 <br />Aroclor 1260 ND 1.00 /I <br /> <br />Excelchem Laboratories. Inc. <br />^ • <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 entirety. <br /> <br />Laboratory Representative <br /> Page 28 of 31