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Wiil L Client: Union Pacific Rail Road - Project Name: QC Lab# TestGroup Para A002473-001 MS hg_ww Merc A002473-001MSD hg_ww Merc Method Blank hg_ww Merc QCs hg_ww Merc Worksheet # WS13039 WS13039 WS13039 WS13039 WS13039 WS13039 WS13039 WS13039 Lab#: A002350-001 A002365-001 A002365-002 A002365-003 A002377-001 A002447-001 A002448-001 A002473-001 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 Note: ND = Not Detected MS = Matrix Spike MSD = Matrix Spike Duplicate SURR = Surrogate BL = Blank DUP = Duplicate RPD = Relative Percent Deviation LCS = Laboratory Control Standard Page 1 of 12 14859 East Clark Avenue, City qlf Industry, California 91745-1396 (626) 336-2139 FAX (626) 336-2634 www.wecklabs.com %RPD Sample QC Added/ True %R or for Low High 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 Note: ND = Not Detected MS = Matrix Spike MSD = Matrix Spike Duplicate SURR = Surrogate BL = Blank DUP = Duplicate RPD = Relative Percent Deviation LCS = Laboratory Control Standard Page 1 of 12 14859 East Clark Avenue, City qlf Industry, California 91745-1396 (626) 336-2139 FAX (626) 336-2634 www.wecklabs.com