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rr-r-rr} Client: Union Pacific Rail Road - Project Name: QC Lab# TestGroup A002473-001 MS hg_ww A002473-00lMSD hg_ww Method Blank hg_ww CCS hg_ww Worksheet #: W S 13039 W S 13039 W S 13039 W S 13039 WS13039 W S 13039 W S 13039 W S 13039 Lab#: A002350-001 A002365-001 A002365-002 A002365-003 A002377-001 A002447-001 A002448-001 A002473-001 Note: ND = Not Detected MS = Matrix Spi BL = Blank DUP = Duplicat 14859 East Clark Avenue, Weck Laboratories, Inc. Environmental and Analytical Services - Since 1964 QC Report Date: Thursday, April 20, 2000 Project #: QUALITY CONTROL REPORT Test Name Mercury in waste water Mercury in waste water Mercury in waste water Mercury in waste water Mercury in waste water Mercury in waste water Mercury in waste water Mercury in waste water Analyzed Date 4/6/00 4/6/00 4/6/00 4/6/00 4/6/00 4/6/00 4/6/00 4/6/00 MSD = Matrix Spike Duplicate SURR = Surrogate RPD = Relative Percent Deviation LCS = Laboratory Control Standard Page 1 of 15 of Industry, California 91745-1396 (626) 336-2139 FAX (626) 336-2634 www.wecklabs.com Amt. %RPD Sample QC Added/ True o for Low High /oR or 9 Result Result Units Value RPD MSD Limit Limit 0.004 0.0071 mg/L 0.004 82.5 0.004 0.0073 mg/L 0.004 87.5 3 0.0000 mg/L 0.0750 mg/L 0.075 100 Analyzed Date 4/6/00 4/6/00 4/6/00 4/6/00 4/6/00 4/6/00 4/6/00 4/6/00 MSD = Matrix Spike Duplicate SURR = Surrogate RPD = Relative Percent Deviation LCS = Laboratory Control Standard Page 1 of 15 of Industry, California 91745-1396 (626) 336-2139 FAX (626) 336-2634 www.wecklabs.com