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CASTLE ANALYTICAL LABORATORY Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone: (209) 384-2930 Certificate No. 2480 Fax: (209) 500-1848 Polychlorinated Biphenyls (PCBs) by GC - Quality Control Castle Analytical Laboratory Reporting Spike Source %REC RPD Analyte Result MDL Limit Units Level 'Result %REC Limits RPD Limit Notes Batch B111082 - EPA 3550B Blank (B111082-BLK1) Prepared: 11/23/21 Analyzed: 11/24/21 Surrogate: 2,4,5,6 Tetrachloro-m-xylene 0.0417 mg/kg wet 0.0400 104 60-140 Aro°lor-1016 ND 0.020 0.050 Aroclor-1221 ND 0.050 0.050 Aroclor-1232 ND 0.020 0.050 Aroclor-1242 ND 0.020 0.050 Aroclor-1248 ND 0.020 0.050 Aroclor-1254 ND 0.010 0.050 Aroclor-1260 ND 0.010 0.050 Aroclor-1268 ND 0.010 0.050 LCS (B111082-BS1) Prepared: 11/23/21 Analyzed: 11/24/21 Surrogate: 2,4,5,6 Tetrachloro-m-xylene 0.0426 mg/kg wet 0.0400 107 60-140 Aroclor-1016 0.418 0.020 0.050 ” 0.400 104 70-130 Aroclor-1260 0.458 0.010 0.050 ,, 0.400 115 70-130 LCS Dup (B111082-BSD1) Prepared: 11/23/21 Analyzed: 11/24/21 Surrogate: 2,4,5,6 Tetrachloro-m-xylene 0.0429 mg/kg wet 0.0400 107 60-140 Aroclor-1016 0.420 0.020 0.050 0.400 105 70-130 0.477 20 Aroclor-1260 0.459 0.010 0.050 ,. 0.400 115 70-130 0.0872 20 Matrix Spike (B111082-MS1) Source: 2111122-20 Prepared: 11/23/21 Analyzed- 11/24/21 Surrogate: 2,4,5,6 Tetrachloro-m-xylene 0.0496 mg/kg dry 0.0471 105 60-140 Aroclor-1016 0.431 0.024 0.059 0.471 ND 91.6 70-130 Aroclor-1260 0.488 0.012 0.059 0.471 ND 104 70-130 Matrix Spike Dup (B111082-MSD1) Source: 2111122-20 Prepared: 11/23/21 Analyzed: 11/24/21 Surrogate: 2,4,5,6 Tetrachloro-m-xylene 0.0498 mg/kg dry 0.0471 106 60-140 Aroclor-1016 0.436 0.024 0.059 0.471 ND 92.7 70-130 1.19 20 Aroclor-1260 0.496 0.012 0.059 0.471 ND 105 70-130 1.63 20 Clan J. Cone / Technical Manager Page 17 of 23