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Quality Control Results Client: Geomatrix Consultants Inc. Job Number: 720-10473-1 Method Blank- Batch: 500-21795 Method: 351.3 Preparation: 351.3_Prep Lab Sample ID: MB 500-21795/1-A Analysis Batch: 500-21803 Instrument ID: ThermoSpectronic Genesy: Client Matrix: Water Prep Batch: 500-21795 Lab File ID: N/A Dilution: 1.0 Units: mg/L Initial Weight/Volume: 100 mL Date Analyzed: 08/31/2007 1450 Final Weight/Volume: 100 mL Date Prepared: 08/30/2007 0650 Analyte Result Qual RL Nitrogen, Kjeldahl ND 0.40 Lab Control Spike - Batch: 500-21795 Method: 351.3 Preparation: 351.3_Prep Lab Sample ID: LCS 500-21795/2-A Analysis Batch: 500-21803 Instrument ID: ThermoSpectronic Genesys Client Matrix: Water Prep Batch: 500-21795 Lab File ID: N/A Dilution: 1.0 Units: mg/L Initial Weight/Volume: 100 mL Date Analyzed: 08/31/2007 1451 Final Weight/Volume: 100 mL Date Prepared: 08/30/2007 0650 Analyte Spike Amount Result % Rec. Limit Qual Nitrogen, Kjeldahl 2.50 2.99 119 80- 120 Matrix Spike/ Method: 351.3 Matrix Spike Duplicate Recovery Report- Batch: 500-21795 Preparation: 351.3_Prep MS Lab Sample ID: 720-10493-Q-4-B MS Analysis Batch: 500-21803 Instrument ID: ThermoSpectronic Genes Client Matrix: Water Prep Batch: 500-21795 Lab File ID: N/A Dilution: 2.0 Initial Weight/Volume: 100 mL Date Analyzed: 08/31/2007 1456 Final Weight/Volume: 100 mL Date Prepared: 08/30/2007 0650 MSD Lab Sample ID: 720-10493-Q-4-C MSD Analysis Batch: 500-21803 Instrument ID: ThermoSpectronic Genesy: Client Matrix: Water Prep Batch: 500-21795 Lab File ID: N/A Dilution: 2.0 Initial Weight/Volume: 100 mL Date Analyzed: 08/31/2007 1457 Final Weight/Volume: 100 mL Date Prepared: 08/30/2007 0650 % Rec. Analyte MS MSD Limit RPD RPD Limit MS Qual MSD Qual Nitrogen, Kjeldahl 39 41 75- 125 1 20 F F Calculations are performed before rounding to avoid round-off errors in calculated results. TestAmerica San Francisco Page 43 of 50 09/10/2007