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CASTLE ANALYTICAL LABORATORY <br />Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 <br /> 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 'YoREC Limits RPD Limit Notes <br />Batch B109064 - EPA 3510C <br />Blank (B109064-BLK1) Prepared & Analyzed: 09/04/21 <br />Surrogate: 2,4,5,6 Tetrachloro-m-xylene 10.5 ugL 10.0 105 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 />Arocl or-1260 ND 2.0 10 <br />Aroclor-1268 ND 2.0 10 <br />If <br />LCS (B109064-BSI) Prepared & Analyzed: 09/04/21 <br />Surrogate: 2,4,5,6 Tetrachloro-m-xy1ene 11.0 ug/L 10.0 110 60-140 <br />Arocl or-1016 244 5.0 10 II 200 122 70-130 <br />Aroclor-1260 100 2.0 10 100 100 70-130 <br />LCS Dup (B109064-BSD1) Prepared & Analyzed: 09/04/21 <br />Surrogate: 2,4,5,6 Tetrachloro-m-xylene 10.9 ug/L 10.0 109 60-140 <br />Aroclor-1016 241 5.0 10 . 200 120 70-130 1.36 . 20 <br />Aroclor-1260 100 2.0 10 0 100 100 70-130 0.0999 20 <br />Matrix Spike (B109064-MS1) Source: 2109008-05 Prepared & Analyzed: 09/04/21 <br />Surrogate: 2,4,5,6 Tetrachloro-m-xylene 11.0 ug/L 10.0 110 60-140 <br />Aroclor-1016 244 5.0 10 200 ND 122 70-130 <br />Aroclor-1260 101 2.0 10 100 ND 101 70-130 <br />Matrix Spike Dup (B109064-MSD1) Source: 2109008-05 Prepared & Analyzed: 09/04/21 <br />Surrogate: 2,4,5,6 Tetrachloro-m-xylene 11.0 ug/L 10.0 110 60-140 <br />Aroclor-1016 241 5.0 10 ,, 200 ND 121 70-130 1.32 20 <br />Aroclor-1260 102 2.0 10 // 100 ND 102 70-130 0.788 20 <br />Clan i J. Cone / Technical Manager <br />Page 5 of 8