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Quality Control Results <br /> Client: Earth Tech, Inc. Job Number: 720-14778-1 <br /> Lab Control Spike/ Method: 6010B <br /> Lab Control Spike Duplicate Recovery Report-Batch: 720-36938 Preparation: Soluble Metals <br /> Soluble <br /> LCS Lab Sample ID: LCS 720-36938/2-A Analysis Batch: 720-36950 Instrument ID: Varian ICP <br /> Client Matrix: Water Prep Batch: 720-36938 Lab File ID: N/A <br /> Dilution: 1.07 Units: mg/L Initial WeightfVolume: <br /> Date Analyzed: 06/18/2008 1826 Final Weight/Volume: 1.0 mL <br /> Date Prepared: 06/18/2008 1733 <br /> LCSD Lab Sample ID:LCSD 720-36938/3-A Analysis Batch: 720-36950 Instrument ID: Varian ICP <br /> Client Matrix: Water Prep Batch: 720-36938 Lab File ID: N/A <br /> Dilution: 1.07 Units: mg/L Initial Weight/Volume: <br /> Date Analyzed: 06/18/2008 1829 Final Weight/Volume: 1.0 mL <br /> Date Prepared: 06/18/2008 1733 <br /> %Rec. <br /> Analyte LCS LCSD Limit RPD RPD Limit LCS Qual LCSD Qual <br /> Antimony �-� � �99 99 80- 120 0 20�.l-�•�^-�� <br /> Arsenic 84 84 80- 120 0 20 <br /> Barium 107 106 80- 120 1 20 <br /> Beryllium 105 105 80-120 0 20 <br /> Cadmium 101 101 80-120 0 20 <br /> Chromium 104 104 80-120 0 20 <br /> Cobalt 101 101 80-120 1 20 <br /> Copper 102 102 80- 120 1 20 <br /> Lead 101 101 80- 120 1 20 <br /> Molybdenum 104 103 80-120 0 20 <br /> Nickel 102 101 80-120 0 20 <br /> Selenium 104 103 80-120 0 20 <br /> Silver 97 97 80-120 0 20 <br /> Thallium 99 98 80-120 1 20 <br /> Vanadium 103 103 80- 120 1 20 <br /> Zinc 101 100 80-120 0 20 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> ' TestAmerica San Francisco Page 45 of 51 <br />