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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> O HOUSTON,TX 77054 <br /> Quality Control Report (713)660-0901 <br /> ATC Associates, Inc. <br /> 090.38083.0060/Crop Production Services <br /> Analysis: Nitrate-Nitrite(as N),Total WorkOrder: 10030200 <br /> Method: SM4500-NO3 F Lab Batch ID: R297595 <br /> Method Blank Samples in Analytical Batch: <br /> RunID: WET_100311ZA-5427417 Units: mg/L Lab Sample ID Client Sample ID <br /> Analysis Date: 03/11/2010 19:00 Analyst: ESK 10030200-01B MW-2 <br /> 10030200-02B MW-3 <br /> 10030200-03B MW-5 <br /> Analyte Result Qual Rep Limit, MDL 10030200-046 MW-6R <br /> --- 10030200-05B MW-7 <br /> Nitrogen,Nitrate-Nitrile ND, 0 50r- 0.0791 <br /> Laboratory Control Sample(LCS) <br /> RunID: WET_100311ZA-5427418 Units: mg/L <br /> Analysis Date: 03/11/2010 19:00 Analyst: ESK <br /> Analyte Spike Result Percent Qual Lower Upper <br /> Added 1 Recovery Limit Limit <br /> Nitrogen, Nitrate-Nitrite 5.000 5.274 105.5 90 110 <br /> Matrix Spike(MS)/Matrix Spike Duplicate(MSD) <br /> Sample Spiked: 10030073-01 <br /> RunID: WET_100311ZA-5427422 Units: mg/L <br /> Analysis Date: 03/11/2010 19:00 Analyst: ESK <br /> Analyte Sample Smp MS MS MS% MS MSD MSD MSD% MSD RPD RPD j RPD J Low High <br /> Result Qual Spike Result Rcvry �Qual Spike Result Rcvry Qual Qual Limit' Limit. Limit <br /> Added Addedr <br /> Nitrogen, Nitrate-Nitrite- 0.6870, 5' 4.996 86 18 5 5.073' 87.72 �1 529 20 90�110 <br /> -- - ---- - _1 _ _;_ I _ �-� 1 <br /> Qualifiers: ND/U-Not Detected at the Reporting Limit MI-Matrix Interference <br /> E-Estimated Value exceeds calibration curve D-Recovery Unreportable due to Dilution <br /> J-Estimated value between MDL and PQL -Recovery Outside Advisable QC Limits <br /> B-Analyte Detected In The Associated Method Blank <br /> N/C-Not Calculated-Sample concentration is greater than 4 times the amount of spike added.Control limits do not apply. <br /> TNTC-Too numerous to count <br /> QC results presented on the QC Summary Report have been rounded. RPD and percent recovery values 4/9/20102:31:17 PM <br /> calculated by the SPL LIMS system are derived from QC data prior to the application of rounding rules. <br />