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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 VGREC RPD Acolyte Result MDL Limit Units Level Result %AEC Limits RPD Limit Notes Batch B111083 - EPA 3550B Blank (B111083-BLK1) Prepared: 11/23/21 Analyzed: 11/24/21 Surrogate: 2,4,5,6 Tetrach1oro-m-xylene 0.0419 mg/kg wet 0.0400 105 60-140 Aroclor-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 Armlor-1260 ND 0.010 0.050 Aroclor-1268 ND 0.010 0.050 LCS (B111083-BS1) Prepared: 11/23/21 Analyzed: 11/24/21 Surrogate: 2,4,5,6 Tetrachloro-m-xylene 0.0424 mg/kg wet 0.0400 106 60-140 Aroclor-1016 0.411 0.020 0.050 0.400 103 70-130 Aroclor-1260 0.458 0.010 0.050 . 0.400 114 70-130 LCS Dup (B111083-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 0.415 0.020 0.050 0.400 104 70-130 0.969 20 Aroclor-1260 0.461 0.010 0.050 0.400 115 70-130 0.784 20 Matrix Spike (B111083-MS1) Source: 2111122-29 Prepared: 11/23/21 Analyzed: 11/24/21 Surrogate: 2,4,5,6 Tetrach1oro-m-xylene 0.0506 mg,/kg dry 0.0472 107 60-140 Aroclor-1016 0.426 0.024 0.059 0.472 ND 90.4 70-130 Aroclor-1260 0.493 0.012 0.059 0.472 ND 105 70-130 Matrix Spike Dup (8111083-MSD1) Source: 2111122-29 Prepared: 11/23/21 Analyzed: 11/24/21 Surrogate: 2,4,5,6 Tetrachloro-m-xylene 0.0501 mg/kg dry 0.0472 106 60-140 Aroclor-1016 0.433 0.024 0.059 0.472 ND 91.8 70-130 1.54 20 Aroclor-1260 0.494 0.012 0.059 0.472 ND 105 70-130 0.191 20 - L/ta/tA, Cent, Clan i J. Cone / Technical Manager Page 18 of 23