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Quality Control Results <br />Job Number: 720-949-1Client: Kennedy/Jenks Consultants <br />Date Analyzed: <br />Date Analyzed: <br />Dilution: <br />Dilution: <br />12/14/2005 1815 <br />12/14/2005 1819 <br />Laboratory Control/ <br />Laboratory Control Duplicate Recovery Report - Batch: 720-3018 <br />1.0 <br />1.0 <br />Water <br />LCS Lab Sample ID: <br />LCSD Lab Sample ID: <br />Client Matrix: <br />Date Prepared: <br />Units: <br />Instrument ID: <br />Lab File ID: <br />Initial Weight/Volume: <br />Final Weight/Volume: <br />Client Matrix:Water <br />Date Prepared: <br />Units: <br />Instrument ID: <br />Lab File ID: <br />Initial Weight/Volume: <br />Final Weight/Volume: <br />mg/L <br />12/14/2005 0927 <br />Prep Batch: 720-3018 <br />Analysis Batch: 720-3057 <br />50 mL <br />50 mL <br />50 mL <br />50 mL <br />mg/L <br />12/14/2005 0927 <br />Analysis Batch: 720-3057 <br />Prep Batch: 720-3018 <br />Method: 6010B <br />Preparation: 3010A <br />N/A <br />N/A <br />Varian ICP <br />Varian ICP <br />LCS 720-3018/2-A <br />LCSD 720-3018/3-A <br />Analyte LCSD QualLCS QualRPD LimitRPDLimitLCSDLCS <br />% Rec. <br />101100 80 - 120 1 20Antimony <br />9998 80 - 120 1 20Arsenic <br />103103 80 - 120 1 20Barium <br />9999 80 - 120 0 20Beryllium <br />9999 80 - 120 1 20Cadmium <br />9999 80 - 120 1 20Chromium <br />9796 80 - 120 1 20Cobalt <br />10099 80 - 120 1 20Copper <br />9897 80 - 120 1 20Lead <br />101100 80 - 120 1 20Molybdenum <br />9998 80 - 120 0 20Nickel <br />100100 80 - 120 1 20Selenium <br />9998 80 - 120 1 20Silver <br />9594 80 - 120 1 20Thallium <br />9898 80 - 120 1 20Vanadium <br />9796 80 - 120 1 20Zinc <br />STL San Francisco <br />Calculations are performed before rounding to avoid round-off errors in calculated results. <br />Page 35 of 39