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CASTLE ANALYTICAL LABORATORY <br />Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone: (209) 384-2930 <br />Certificate No. 2480 <br /> Fax: (209) 500-1848 <br />Polychlorinated Biphenyls (PCBs) by GC - Quality Control <br />Castle Analytical Laboratory <br />Reporting Spike Source %REC RPD <br />Analyte Result MDL Limit Units Level Result %PBC Limits RPD Limit Notes <br />Batch B111084 - EPA 3510C <br />Blank (B111084-BLK1) Prepared: 11/23/21 Analyzed: 11/24/21 <br />Surrogate: 2,4,5,6 Tetrachloso-m-xy/ene 10.6 ug/L 10.0 106 60-140 <br />Aroclor-1016 ND 5.0 10 <br />Aroclor-1221 ND 10 10 <br />Aroclor-1232 ND 5.0 10 <br />Aroclor-1242 ND 5.0 10 <br />Aroclor-1248 ND 5.0 10 <br />Aroclor-1254 ND 2.0 10 <br />Aroclor-1260 ND 2.0 10 <br />Aroclor-1268 ND 2.0 10 <br />LCS (B111084-BS1) Prepared: 11/23/21 Analyzed: 11/24/21 <br />Surrogate: 2,4,5,6 Tetrachloro-m-xylene 10.8 ug/L 10.0 108 60-140 <br />Aroclor-1016 104 5.0 10 n 100 104 70-130 <br />Aroclor-1260 121 2.0 10 " 100 121 70-130 <br />LCS Dup (B111084-BSD1) Prepared: 11/23/21 Analyzed: 11/24/21 <br />Surrogate: 2,4,5,6 Tetrachloro-m-xylene 10.8 ug/L 10.0 108 60-140 <br />Aroclor-1016 104 5.0 10 " 100 104 70-130 0.288 20 <br />Aroclor-1260 121 2.0 10 100 121 70-130 0.331 20 <br />Matrix Spike (B111084-MS1) Source: 2111122-30 Prepared: 11/23/21 Analyzed: 11/24/21 <br />Surrogate: 2,4,5,6 Tetrachloro-m-xylene 10.8 ug/L 10.0 108 60-/40 <br />Aroclor-1016 103 5.0 10 ” 100 ND 103 70-130 <br />Arodor-1260 120 2.0 10 II 100 ND 120 70-130 <br />Matrix Spike Dup (B111084-MSD1) Source: 2111122-30 Prepared: 11/23/21 Analyzed: 11/24/21 <br />Surrogate: 2,4,5,6 Tetrachloro-m-xylene 10.7 ug/L 10.0 107 60-140 <br />Aroclor-1016 103 5.0 10 100 ND 103 70-130 0.388 20 <br />Aroclor-1260 120 2.0 10 100 ND 120 70-130 0.00 20 <br />Clan i J. Cone / Technical Manager <br />Page 19 of 23