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June 2, 2008 Lab ID : STK0834357 Luhdorff& Scalmanini Consulting Customer : 3-12023 Quality Control-Inorganic Constituent Method Date/ID Type Units Cone. QC Data DQO Note Wet Chem Fluoride 300.0 05/02/2008:204745 CCB ppm 0.000 0.1 CCV ppm 2.500 99.8% 90-110 CCB ppm 0.000 0.1 CCV ppm 2.500 108% 90-110 H%droxide 2320B 05/10/2008:204578 Dup m I 0.0 10 V1 BAS 5540C 05/02/2008:204320 MS mg/L 1.000 1000 90-110 MSD mg/L 1.000 100% 90-110 MSRPD m 1.000 0.0 <0.1 5540C 05/02/2008:204701 CCB mg/L 0.000 0.1 CCV m 1.000 100% 99-101 �in:uc 300.0 05/02/2008:204323 LCS mg/L 20.00 91.4% 90-110 MS mg/L 400.0 95.3% 88-124 MSD mg/L 400.0 104% 88-124 MSRPD mg/L 100.0 8.0% <_29.1 300.0 05/02/2008:204745 CCB ppm 0.000 0.4 CCV ppm 20.00 96.3% 90-110 CCB ppm 0.000 0.4 CCV ppm 20.00 96.7% 90-110 CCB ppm 0.000 0.4 CCV PPM 20.00 106% 90-110 Nitrite 300.0 05/02/2008:204323 LCS mg/L 15.00 96.2% 90-110 MS mg/L 300.0 99.5% 91-121 MSD mg/L 300.0 108% 91-121 MSRPD m 100.0 7.9% X3.8 300.0 05/02/2008:204745 CCB ppm 0.000 0.3 CCV ppm 15.00 101% 90-110 CCB ppm 0.000 0.3 CCV ppm 15.00 102% 90-110 CCB ppm 0.000 0.3 CCV PVM 15.00 97.3% 90-110 pH 4500-H B 05/29/2008:205274 Dup units 0.3% 4.80 4500HB 05/29/2008:205819 CCV units 8.000 100% 95-105 CCV units 8.000 100% 95-105 Solids,Total Dissolved 2540 C,E 05/05/2008:204356 Blank mg/L 20 20 LCS mg/L 1000 101% 90-110 LCS mg/L 1000 100% 90-110 Dup I mgfL 1 1.0% 10.0 Sulfate 300.0 05/02/2008:204323 LCS mg/L 50.00 93.1% 90-110 MS mg/L 1000 97.8% 78-137 MSD mg/L 1000 110% 78-137 MSRPD m 100.0 11.5% :512.3 100.0 05/02/2008:204745 CCB ppm 0.00 2 CCV ppm 50.00 98.6% 90-110 CCBppm 0.00 _ CCV m 50.00 98.1 Oil 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. MSD :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. Du :Duplicate Sample-A random sample with each batch is prepared and analyzed in duplicate. The relative percent difference is an P indication of precision for the preparation and analysis. STK0834357:Quality Control Page 3 of 4