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Quality Control Results Client: Geomatrix Consultants Inc. Job Number: 720-10473-1 Method Blank- Batch: 500-21702 Method: 353.2 Preparation: N/A Lab Sample ID: MB 500-21702/18 Analysis Batch: 500-21702 Instrument ID: Seal AQ-2 Client Matrix: Water Prep Batch: N/A Lab File ID: N/A Dilution: 1.0 Units: mg/L Initial Weight/Volume: mL Date Analyzed: 08/30/2007 1045 Final Weight/Volume: mL Date Prepared: N/A Analyte Result Qual RL Nitrogen, Nitrate Nitrite 0.12 0.10 Lab Control Spike - Batch: 500-21702 Method: 353.2 Preparation: N/A Lab Sample ID: LCS 500-21702/19 Analysis Batch: 500-21702 Instrument ID: Seal AQ-2 Client Matrix: Water Prep Batch: N/A Lab File ID: N/A Dilution: 1.0 Units: mg/L Initial Weight/Volume: 100 mL Date Analyzed: 08/30/2007 1047 Final Weight/Volume: 100 mL Date Prepared: N/A Analyte Spike Amount Result % Rec. Limit Qual Nitrogen, Nitrate Nitrite 0.500 0.563 113 80- 120 Matrix Spike/ Method: 353.2 Matrix Spike Duplicate Recovery Report- Batch: 500-21702 Preparation: N/A MS Lab Sample ID: 500-6218-B-3 MS Analysis Batch: 500-21702 Instrument ID: Seal AQ-2 Client Matrix: Water Prep Batch: N/A Lab File ID: N/A Dilution: 1.0 Initial Weight/Volume: 10 mL Date Analyzed: 08/30/2007 1148 Final Weight/Volume: 10 mL Date Prepared: N/A MSD Lab Sample ID: 500-6218-B-3 MSD Analysis Batch: 500-21702 Instrument ID: Seal AQ-2 Client Matrix: Water Prep Batch: N/A Lab File ID: N/A Dilution: 1.0 Initial Weight/Volume: 10 mL Date Analyzed: 08/30/2007 1149 Final Weight/Volume: 10 mL Date Prepared: N/A % Rec. Analyte MS MSD Limit RPD RPD Limit MS Qual MSD Qual Nitrogen, Nitrate Nitrite 115 113 75- 125 2 20 Calculations are performed before rounding to avoid round-off errors in calculated results. TestAmerica San Francisco Page 44 of 50 09/10/2007