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1 <br /> ' Quality Control Results <br /> Job Number: 720-14844-1 <br /> 1 Client: Earth Tech, Inc. <br /> Method: 6010B <br /> 1 Matrix Spike/ P <br /> Pre aration: 3050B <br /> Matrix Spike Duplicate Recovery Report-Batch: 720-37214 <br /> 37263 Instrument ID: Varian ICP <br /> Analysis Batch: 720- <br /> MS Lab Sample ID: 720-14844-1 y Lab File ID: N/A <br /> Client Matrix: Solid Prep Batch: 720-37214 <br /> 1.0 Initial Weight/Volume: 1.03 g <br /> Dilution: Final Weight/Volume'. 50 mL <br /> 1 Date Analyzed: 06/24/2008 1920 <br /> Date Prepared: 06/24/2008 1121 <br /> 11 <br /> 11 <br /> MSD y 1 <br /> Anal sis Batch: 720-37263 Instrument ID: Varian ICP Lab Sample ID: 720-14844-1 <br /> Client Matrix: Solid Prep Batch: 720-37214 Lab File ID: N/A <br /> 1.0 Initial Weight/Volume: 1.04 g <br /> Dilution: Final WeighWolume: 50 mL <br /> Date Analyzed: 06/24/2008 1924 <br /> ' Date Prepared: 06/24/2008 1121 <br /> 1 %Rec. <br /> RPD RPD Limit MS Qual MSD Qual <br /> Analyte MS MSD Limit <br /> Anti <br /> _mony_ -- F F <br /> 33 ._ 31—`" 75- 125 5 1 Arsenic 91 88 75-125 5 20 <br /> Barium <br /> 95 87 75- 125 6 20 Beryllium 96 92 75-125 5 20 <br /> Cadmium 88 85 75-125 4 20 <br /> 1 Chromium 93 89 75-125 5 20 <br /> Cobalt 88 85 75-125 4 20 <br /> Copper 98 94 75- 125 5 20 <br /> 1 Lead 88 85 75- 125 4 20 <br /> Molybdenum 89 85 75-125 5 20 <br /> Nickel 89 85 75- 125 5 20 <br /> 1 Selenium 92 88 75-125 5 20 <br /> Silver 92 88 75- 125 5 20 <br /> Thallium <br /> 86 83 75-125 4 20 <br /> Vanadium 94 90 75-125 5 20 <br /> 1 Zinc 87 84 75-125 4 20 <br /> i <br /> 1 <br /> 1 <br /> 1 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> 1 TestAmerica San Francisco Page 26 of 30 <br />