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April 12, 2010 Lab ID : STKI032437 <br /> Proactive Customer : 3-16551 <br /> Quality Control- Inorganic <br /> Constituent Method Date/ID Type Units Cone. QC Data DQO Note <br /> Metals <br /> Zinc 3010 04/05/2010:203295 PDS m 2.000 94.9% 75-125 <br /> Mmroury 7470 03/24/2010:202901 Blank ug(L ND <0.02 <br /> LCS ug(L. 0.1998 110% 85-115 <br /> MS ug/L. 0.1998 119% 75-125 <br /> (SP 1002547-001) MSD ug/L 0.1998 120% 75-125 <br /> MSRPD u 0.1998 1.3% S20 <br /> at Chem <br /> Solids,Suspended 2540D 03/23/2010:300219 Blank mgfL ND <I <br /> LCS mg(L, 500.0 96.2% 38-138 <br /> LCS mg/L 500.0 97.1% 38-138 <br /> (STKI032353-001) jDup I m L 1 1 4.6% 1 28.7 <br /> Definition <br /> CCV :Continuing Calibration Verification-Analyzed to verify the instrument calibration is within criteria. <br /> CCB :Continuing Calibration Blank-Analyzed m verify the instrument baseline is within criteria. <br /> Blank :Method Blank-Prepared to verify that the preparation process is not contributing contamination to the samples. <br /> LCS :Laboratory Control Standard/Sample-Prepared to verify that the preparation process is not affecting analyte recovery. <br /> MS :Matrix Spikes-A random sample is spiked with a known amount of analyte.The recoveries are an indication of how that sample <br /> matrix affects analyte recovery. <br /> MSD :Matrix Spike Duplicate of MS/MSD pair-A random sample duplicate is spiked with a known amount ofanalyted.The recoveries <br /> are an indication of how that sample matrix affects analyte recovery. <br /> Dup :Duplicate Sample-A random sample with each batch is prepared and analyzed in duplicate.The relative percent difference is an <br /> indication of precision for the preparation and analysis. <br /> MSRPD :MS/MSD Relative Percent Difference(RPD)-The MS relative percent difference is an indication of precision for the preparation <br /> and analysis. <br /> ND :Non-detect-Result was below the DQO listed for the analyte. <br /> DQO :Data Quality Objective-This is the criteria against which the quality control data is compared. <br /> Explanation <br /> 220 :The CCB was greater than the DQO.However,all results were either five times greater than the CCB concentration or ND relative <br /> to the PQL. <br /> Page 8 of 8 <br />