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Wiil L <br />Client: Union Pacific Rail Road - St( <br />Project Name: <br />QC Lab# <br />LCS <br />TestGroup <br />ph—water pH <br />Weck Laboratories, Inc. <br />Environmental and Analytical Services - Since 1964 <br />QC Report Date: Thursday, April 20, 2000 <br />Project #: <br />QUALITY CONTROL REPORT <br />Amt. %RPD <br />Added/ <br />Sample QC True %R or for Low High <br />Result Result Units Value RPD MSD Limit Limit <br />6.84 Units 6.86 99.7 <br />Note: <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 2 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 />