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September 23, 2008 Lab ID : STK0838541 Luhdorff& Scalmanini Consulting Customer : 3-12023 Quality Control - Inorganic Constituent )Icthod Date/ID l N pe L nits Conc. QC Data DQO Note Wet Chem Nitrite 300.0 08/28/2008:210326 CCV ppm 15.00 103 4s. 90-110 CCB ppm 0.000 0.3 CCV PPM 15.00 108 4s, 90-110 H 4500-H B 08/28/2008:208710 Dup units 0.3% 4.80 4500HB 08/28/2008:210304 CCV units 8.000 100% 95-105 CCV units 8.000 102% 95-105 Solids,Total Dissolved 2540 C,E 08/27/2008:208645 Blank mg/L ND <20 LCS mg/L 995.0 98.5 9/o 90-110 LCS mg/L 995.0 98.5 IN, 90-110 Dup m L 0.5% 10.0 Sult;ue 300.0 08/27/2008:208662 LCS mg/L 50.00 99.8% 90-110 (STK0838664-001) MSD mg/L 1000 101% 78-137 MSRPD mg/L 100.0 105% :578-137 LCS mg/L 50.00 105% 90-110 MS mg/L 1000 104% 78-137 (CH 0877644-001) MSD mg/L 1000 105% 78-137 MSRPD mg/L 100.0 1 1.7% <12.3 300.0 08/27/2008:210326 CCB ppm 0.00 2 CCV ppm 50.00 10101/. 90-110 CCB ppm 0.00 2 CCV ppm 50.00 104% 90-110 CCB ppm 0.00 2 CCV ppm 50.00 105% 90-110 CCB ppm 0.00 2 CCV ppm 50.00 100% 90-110 CCB ppm 0.00 2 CCV E2in 50.00 103% 90-110 Definition ICV :Initial Calibration Verification-Analyzed to verify the instrument calibration is within criteria. ICB :Initial Calibration Blank-Analyzed to verify the instrument baseline is within criteria. CCV :Continuing Calibration Verification-Analyzed to verify the instrument calibration is within criteria. CCB :Continuing Calibration Blank-Analyzed to verify the instrument baseline is within criteria. Blank :Method Blank-Prepared to verify that the preparation process is not contributing contamination to the samples. LCS :Laboratory Control Standard/Sample-Prepared to verify that the preparation process is not affecting analyte recovery. MS :Matrix Spikes-A random sample is spiked with a known amount of analyte.The recoveries are an indication of how that sample matrix affects analyte recovery. NISD :Matrix Spike Duplicate of MS/MSD pair-A random sample duplicate is spiked with a known amount of analyted.The recoveries are an indication of 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. MSRPD :MS/MSD Relative Percent Difference(RPD)-The MS relative percent difference is an indication of precision for the preparation and analysis. ND :Non-detect-Result was below the DQO listed for the analyte. DQO Data Quality Objective-This is the criteria against which the qualiry control data is compared. Explanation 440 :Sample nonhomogeneity may be affecting this analyte.Data was acce ted based on the LCS or CCV recovery.