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Wiii L Weck Laboratories, Inc. Environmental and Analytical Services - Since 1964 Client: Union Pacific Rail Road - Stoc <ton QC Report Date: Thursday, April 20, 2000 Project Name: Project #: QUALITY CONTROL REPORT Added/ %RPD Sample QC True %R or for Low High QC Lab# TestGroup Parameter Result Result Units Value RPD MSD Limit Limit Worksheet #: Lab#: Test Name WS13049 A002447-001 pH in water WS13049 A002448-001 pH in water WS13049 A002459-002 pH in water WS13049 A002462-001 pH in water WS13049 A002462-002 pH in water WS13049 A002462-003 pH in water WS13049 A002462-004 pH in water WS13049 A002462-005 pH in water WS13049 A002463-001 pH in water WS13049 A002463-002 pH in water WS13049 A002463-003 pH in water WS13049 A002463-004 pH in water WS13049 A002463-005 H in water WS13049 A002463-006 H in water WS13049 A002463-007 H in water WS13049 A002467-001 H in water WS13049 A002467-002 3H in water WS13049 A002467-003 H in water WS13049 A002467-004 H in water WS13049 A002467-005 H in water WS13049 A002467-006 H in water WS13049 A002467-007 H in water WS13049 A002467-008 H in water WS13049 A002467-009 H in water WS13049 A002467-010 H in water WS13049 A002467-011 H in water WS13049 A002467-012 H in water WS13049 A002467-013 H in water WS13049 A002467-014 H in water WS13049 A002467-015 in water WS13049 A002468-002 p in water Note: ND = Not Detected MS = Matrix Spike BL = Blank DUP = Duplicate Analyzed Date 4/4/00 4/4/00 4/4/00 4/4/00 4/4/00 4/4/00 4/4/00 4/4/00 4/4/00 4/4/00 4/4/00 4/4/00 4/4/00 4/4/00 4/4/00 4/4/00 4/4/00 4/4/00 4/4/00 4/4/00 4/4/00 4/4/00 4/4/00 4/4/00 4/4/00 4/4/00 4/4/00 4/4/00 414/00 4/4/00 414/00 MSD = Matrix Spike Duplicate SURR = Surrogate RPD = Relative Percent Deviation LCS = Laboratory Control Standard Page 3 of 12 14859 East Clark Avenue, City f Industry, California 91745-1396 (626) 336-2139 FAX (626) 336-2634 www.wecklabs.com