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'Wi, L Weck Laboratories, Inc. <br />Environmental and Analytical Services - Since 1964 <br />Client: Union Pacific Rail Road - Stockton QC Report Date: Thursday, April 20, 2000 <br />Project Name: Project #: <br />QUALITY CONTROL REPORT <br />QC Lab# TestGroup Para eter <br />A002448-001DUP h2s_reactive Total lReleasable Hydrogen Sulfide <br />Method Blank <br />h2s_re2ctive Total <br />Releasable Hydrogen Sulfide <br />Worksheet #: <br />Lab#: <br />Test Name <br />WS13473 <br />A002447-001 <br />Reactive sulfide <br />WS13473 <br />A002448-001 <br />Reactive sulfide <br />WS13473 <br />A002448-002 <br />Reactive sulfide <br />WS13473 <br />A002706-001 <br />Reactive sulfide <br />Added/ %RPD <br />Sample QC True %R or for Low High <br />Result Result Units Value RPD MSD Limit Limit <br />4.00 3.21 mg/L — 21.9 — <br />0.00 mg/L <br />Analyzed Date <br />4/19/00 <br />4/19/00 <br />4/19/00 <br />4/19/00 <br />Note: <br />ND = Not Detected MS = Matrix Spik MSD = Matrix Spike Duplicate SURR = Surrogate <br />BL = Blank DUP = Duplicate RPD = Relative Percent Deviation LCS = Laboratory Control Standard <br />Page 14 of 15 <br />14859 East Clark Avenue, Citylof Industry, Califomia 91745-1396 (626) 336-2139 FAX (626) 336-2634 <br />www.wecklabs.com <br />