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February 01, 2007 Lab ID : STK730134 Neil Anderson & Associates Customer : 3-9574 Quality Control - Inorganic =Constituent Method Date/ID Type Units Conc. QC Data DQO Note Wet Chem Nitrite 300.0 01/04/2007:13215 MS mg/L 300.0 111% 91-121 (STK730135-06) MSD mg/L 300.0 108% 91-121 MSRPD mg/L 2.8% 523.8 300.0 01104/2007:A 00-ICB ppm ND <0.3 00-CCB ppm ND <0.3 00-1CV ppm 30.00 100% 90-110 00-CCV ppm 15.00 97.5% 90-110 Nitrogen, Total Kjeldahl 351.1 0110812007:A242 Blank mg/L ND <0.5 LCS mg/L 2.000 105% 69-125 MS mg/L 2.000 79.0% 0-149 (SP 612562-01) MSD mg/L 2.000 66.6% 0-149 MSRPD mg/L 0.25 50.500 Ammonia Nitrogen 351.1 01/12/2007:A 00-ICS mg/l ND <0.2 00-CCB mg/1 ND <0.2 00-ICV mg/1 2.000 92.8% 90-110 00-CCV mg/1 2.000 92.8% 90-110 pH 4500-H B 01/0312007:S346 Dup units 0.0% 0.995 4500-H B 01103/2007:S O0-CCV units 8.000 99.2% 95-105 Solids, Total Suspended (TSS) 2540D 01/09/2007:A236 Blank mg/L ND <10 LCS mg/L 500.0 83.2% 38-138 Dup mg/L 0.50 10 Explanations 408 Matrix Spike(MS) or Post Digestion Spike(PDS) has no Acceptance Range (DQO) because of high analyte concentration in the sample. Data was accepted based on the LCS or CCV recovery. 435 Sample matrix may be affecting this analyte. Data was accepted based on the LCS or CCV recovery. Definitions Blank Method Blank - Prepared to verify that the preparation process is not contributing contamination to the samples. RgBlk Method Reagent Blank - Prepared to correct for any reagent contributions to sample result. LCS Laboratory Control Standard/Sample - Prepared to verify that the preparation process is not affecting analyte recovery. MSIMSD Matrix Spikes - A random sample is spiked with a known amount of analyte. The recoveries are an indication lo how that sample matrix affects analyte recovery. Dup Duplicate Sample - A random sample with each batch is prepared and analyzed in duplicate. The relative percent difference is an indication of precision for the preparation and analysis. ICB Initial Calibration Blank - Analyzed to verify the instrument baseline is within criteria. ICV Initial Calibration Verification - Analyzed to verify the instrument calibration is within criteria. CCB Continuing Calibration Blank - Analyzed to verify the instrument baseline is within criteria. CCV Continuing Calibration Verification - Analyzed to verify the instrument calibration is within criteria. ND Non-detect - Result was below the DQO listed for the analyte. <14 High Sample Background - Spike concentration was less than one forth of the sample concentration. DQO Data Quality Objective - This is the criteria against which the quality control data is compared. STK730134: Quality Control Page 2