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Quality Control Results Client: Geomatrix Consultants Inc. Job Number: 720-10502-1 Method Blank- Batch: 500-21798 Method: 350.2 Preparation: Distill/Ammonia Lab Sample ID: MB 500-21798/1-A Analysis Batch: 500-21809 Instrument ID: ThermoSpectronic Genesy: Client Matrix: Water Prep Batch: 500-21798 Lab File ID: N/A Dilution: 1.0 Units: mg/L Initial Weight/Volume: 100 mL Date Analyzed: 08/31/2007 1440 Final Weight/Volume: 100 mL Date Prepared: 08/31/2007 1045 Analyte Result Qual RL Ammonia (as N) ND 0.20 Lab Control Spike - Batch: 500-21798 Method: 350.2 Preparation: Distill/Ammonia Lab Sample ID: LCS 500-21798/2-A Analysis Batch: 500-21809 Instrument ID: ThermoSpectronic Genesys Client Matrix: Water Prep Batch: 500-21798 Lab File ID: N/A Dilution: 1.0 Units: mg/L Initial Weight/Volume: 100 mL Date Analyzed: 08/31/2007 1440 Final Weight/Volume: 100 mL Date Prepared: 08/31/2007 1045 Analyte Spike Amount Result % Rec. Limit Qual Ammonia (as N) 2.50 2.87 115 80- 120 Matrix Spike/ Method: 350.2 Matrix Spike Duplicate Recovery Report- Batch: 500-21798 Preparation: Distill/Ammonia MS Lab Sample ID: 500-6190-E-1-F MS Analysis Batch: 500-21809 Instrument ID: ThermoSpectronic Genes Client Matrix: Water Prep Batch: 500-21798 Lab File ID: N/A Dilution: 5.0 Initial Weight/Volume: 100 mL Date Analyzed: 08/31/2007 1447 Final Weight/Volume: 100 mL Date Prepared: 08/31/2007 1045 MSD Lab Sample ID: 500-6190-E-1-G MSD Analysis Batch: 500-21809 Instrument ID: ThermoSpectronic Genesy: Client Matrix: Water Prep Batch: 500-21798 Lab File ID: N/A Dilution: 5.0 Initial Weight/Volume: 100 mL Date Analyzed: 08/31/2007 1448 Final Weight/Volume: 100 mL Date Prepared: 08/31/2007 1045 % Rec. Analyte MS MSD Limit RPD RPD Limit MS Qual MSD Qual Ammonia (as N) 70 98 75- 125 5 20 4 4 Calculations are performed before rounding to avoid round-off errors in calculated results. TestAmerica San Francisco Page 37 of 44 09/04/2007