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Wiil L <br />Weck Laboratories, Inc. <br />Environmental and Analytical Services - Since 1964 <br />Client: Union Pacific Rail Road - Sto�kton QC Report Date: Thursday, April 20, 2000 <br />Project Name: Project #: <br />QUALITY CONTROL REPORT <br />Added/ %RPD <br />Sample QC True %R or for Low High <br />QC Lab# TestGroup Para eter Result Result Units value RPD MSD Limit Limit <br />WS13049 A002469-002 pH in water 4/4/00 <br />N ote: <br />ND = Not Detected MS = Matrix Spike MSD = Matrix Spike Duplicate SURR = Surrogate <br />BL = Blank DUP = Duplicate RPD = Relative Percent Deviation LCS = Laboratory Control Standard <br />Page 4 of 15 <br />14859 East Clark Avenue, City f Industry, California 91745-1396 (626) 336-2139 FAX (626) 336-2634 <br />www.wecklabs.com <br />