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Quality Control Results Client: Geomatrix Consultants Inc. Job Number: 720-10473-1 Method Blank- Batch: 500-21772 Method: 350.2 Preparation: Distill/Ammonia Lab Sample ID: MB 500-21772/1-A Analysis Batch: 500-21773 Instrument ID: ThermoSpectronic Genesy: Client Matrix: Water Prep Batch: 500-21772 Lab File ID: N/A Dilution: 1.0 Units: mg/L Initial Weight/Volume: mL Date Analyzed: 08/30/2007 1705 Final Weight/Volume: mL Date Prepared: 08/30/2007 1445 Analyte Result Qual RL Ammonia (as N) ND 0.20 Lab Control Spike - Batch: 500-21772 Method: 350.2 Preparation: Distill/Ammonia Lab Sample ID: LCS 500-21772/2-A Analysis Batch: 500-21773 Instrument ID: ThermoSpectronic Genesys Client Matrix: Water Prep Batch: 500-21772 Lab File ID: N/A Dilution: 1.0 Units: mg/L Initial Weight/Volume: 100 mL Date Analyzed: 08/30/2007 1706 Final Weight/Volume: 100 mL Date Prepared: 08/30/2007 1445 Analyte Spike Amount Result % Rec. Limit Qual Ammonia (as N) 2.50 2.48 99 80- 120 Matrix Spike/ Method: 350.2 Matrix Spike Duplicate Recovery Report- Batch: 500-21772 Preparation: Distill/Ammonia Dissolved MS Lab Sample ID: 500-6173-H-1-B MS +D Analysis Batch: 500-21773 Instrument ID: ThermoSpectronic Genes Client Matrix: Water Prep Batch: 500-21772 Lab File ID: N/A Dilution: 1.0 Initial Weight/Volume: 100 mL Date Analyzed: 08/30/2007 1712 Final Weight/Volume: 100 mL Date Prepared: 08/30/2007 1445 MSD Lab Sample ID: 500-6173-H-1-C MSD +DAnalysis Batch: 500-21773 Instrument ID: ThermoSpectronic Genesy: Client Matrix: Water Prep Batch: 500-21772 Lab File ID: N/A Dilution: 1.0 Initial Weight/Volume: 100 mL Date Analyzed: 08/30/2007 1712 Final Weight/Volume: 100 mL Date Prepared: 08/30/2007 1445 % Rec. Analyte MS MSD Limit RPD RPD Limit MS Qual MSD Qual Ammonia (as N) 74 77 75- 125 3 20 F Calculations are performed before rounding to avoid round-off errors in calculated results. TestAmerica San Francisco Page 42 of 50 09/10/2007