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A8L1471 Eke=-K General: Heavy Metals ASSOCIATES BSK Associates Laboratory Fresno Metals Quality Control Report Spike Source %REC RPD Date Analyte Result RL Units Level Result %REC Limits RPD Limit Analyzed Qual EPA 6020A-Quality Control Batch:A818640 Prepared: 12/13/2018 Prep Method:EPA 3050B Analyst: MAS Blank Spike Dup(A818640-BSD1) Mercury 2.5 0.50 mg/kg 2.5 ND 101 75-125 0 20 12/18/18 Matrix Spike(A818640-MS1),Source:A81-0671-01 Mercury 2.4 0.50 mg/kg 2.5 ND 97 75-125 12/18/18 Matrix Spike Dup(A818640-MSD1),Source:A81-0671-01 Mercury 2.5 0.50 mg/kg 2.5 ND 99 75-125 2 20 12/18/18 EPA 6020A-Quality Control Batch:A818732 Prepared: 12/15/2018 Prep Method:EPA 3010A for TCLP(EPA 1311) Analyst: MAS Blank(A818732-BLK1) Mercury,TCLP ND 0.020 mg/L 12/17/18 Blank Spike(A818732-BS1) Mercury,TCLP 0.18 0.020 mg/L 0.20 ND 92 75-125 12/17/18 Blank Spike Dup(A818732-BSD1) Mercury,TCLP 0.18 0.020 mg/L 0.20 ND 90 75-125 2 20 12/17/18 Duplicate(A818732-DUP1),Source:A81-1471-01 Mercury,TCLP ND 0.020 mg/L ND 20 12/17/18 Matrix Spike(A818732-MS1),Source:A8L1471-01 Mercury,TCLP 0.18 0.020 mg/L 0.20 ND 92 75-125 12/17/18 Matrix Spike Dup(A818732-MSD1),Source:A81-1471-01 Mercury,TCLP 0.18 0.020 mg/L 0.20 ND 92 75-125 0 20 12/17/18 EPA 6020A-Quality Control Batch:A818733 Prepared: 12/15/2018 Prep Method:EPA 3010A for STLC/DISTLC Analyst: MAS Blank(A818733-BLK1) Mercury,WET ND 0.020 mg/L 12/17/18 Blank Spike(A818733-BS1) Mercury,WET 0.19 0.020 mg/L 0.20 ND 93 75-125 12/17/18 Blank Spike Dup(A818733-BSD1) Mercury,WET 0.19 0.020 mg/L 0.20 ND 94 75-125 1 20 12/17/18 Duplicate(A818733-DUP1),Source:A81-1471-01 Mercury,WET ND 0.020 mg/L ND 20 12/17/18 The results in this report apply to the samples analyzed in A8L1471 FINAL 12272018 1717 accordance with the chain of custody document. This analytical report must be reproduced in its entirety. www.BSKAssociates.com Page 12 of 18