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1534 Willow Pass Road, Pittsburg, CA 94565-1701 <br />M c Campbell Analytical , Inc . Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 <br />rty rr Counts" http://www.mccampbell.com / E-mail: main@mccampbell.com <br />When Quali <br />CA ELAP 1644 <br />Page 7 of 11 <br />Quality Control Report <br />Client: <br />Terracon <br />WorkOrder: <br />2104518 <br />Date Prepared: <br />04/14/2021 <br />BatchID: <br />219516 <br />Date Analyzed: <br />04/14/2021 <br />Extraction Method: <br />E524.3 <br />Instrument: <br />GC45 <br />Analytical Method: <br />E524.3 <br />Matrix: <br />Drinking Water <br />Unit: <br />gg/L <br />Project: <br />NA217019; EHLERS PROPERTY Sample ID: <br />MB/LCS/LCSD-219516 <br />%REC <br />Limits <br />2104518-002AMS/MSD <br />CA ELAP 1644 <br />Page 7 of 11 <br />QC Summary Report for E524.3 <br />Analyte <br />MB <br />MDL <br />RL <br />SPK <br />MB SS <br />MB SS <br />Result <br />Val <br />%REC <br />Limits <br />1,2-Dibromo-3-chloropropane <br />ND <br />0.00630 <br />0.0100 <br />- <br />- <br />- <br />1,2-Dibromoethane (EDB) <br />ND <br />0.0150 <br />0.0200 <br />- <br />- <br />- <br />Surrogate Recovery <br />tert-Butyl methyl -d3 <br />1.06 <br />1 <br />106 <br />70-130 <br />-ether <br />4 -BFB <br />0.997 <br />1 <br />100 <br />70-130 <br />1,2 -dichlorobenzene -d4 <br />1.01 <br />1 <br />101 <br />70-130 <br />Analyte <br />LCS <br />LCSD <br />SPK <br />LCS <br />LCSD <br />LCS/LCSD <br />RPD <br />RPD <br />Result <br />Result <br />Val <br />%REC <br />%REC <br />Limits <br />Limit <br />1,2-Dibromo-3-chloropropane <br />0.0781 <br />0.0750 <br />0.10 <br />78 <br />75 <br />70-130 <br />4.05 <br />20 <br />1,2-Dibromoethane (EDB) <br />0.0924 <br />0.0834 <br />0.10 <br />92 <br />83 <br />70-130 <br />10.2 <br />20 <br />Surrogate Recovery <br />tert-Butyl methyl ether -d3 <br />1.04 <br />0.924 <br />1 <br />104 <br />92 <br />70-130 <br />12.0 <br />20 <br />4 -BFB <br />0.970 <br />0.966 <br />1 <br />97 <br />97 <br />70-130 <br />0.374 <br />20 <br />1,2 -dichlorobenzene -d4 <br />1.02 <br />1.02 <br />1 <br />102 <br />102 <br />70-130 <br />0.544 <br />20 <br />Analyte <br />MS <br />MS <br />MSD <br />SPK <br />SPKRef <br />MS <br />MSD <br />MS/MSD <br />RPD <br />RPD <br />DF <br />Result <br />Result <br />Val <br />Val <br />%REC <br />%REC <br />Limits <br />Limit <br />1,2-Dibromo-3-chloropropane <br />1 <br />0.0793 <br />0.0701 <br />0.10 <br />ND <br />79 <br />70 <br />70-130 <br />12.3 <br />30 <br />Surrogate Recovery <br />tert-Butyl methyl ether -d3 <br />1 <br />1.06 <br />1.03 <br />1 <br />106 <br />103 <br />70-130 <br />2.25 <br />30 <br />4 -BFB <br />1 <br />0.959 <br />1.00 <br />1 <br />96 <br />100 <br />70-130 <br />4.36 <br />30 <br />1,2 -dichlorobenzene -d4 <br />1 <br />1.06 <br />1.05 <br />1 <br />105 <br />105 <br />70-130 <br />0.485 <br />30 <br />CA ELAP 1644 <br />Page 7 of 11 <br />