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03/11/2010 15:59 20947874 STOCKTON STEEL PAGE 08110 <br /> February 9, 2010 Lab ID : STKI030077 <br /> Stockton Steel Customer : 3-2690 <br /> Quality Control- Inorganic <br /> ottstituent Method DateAD Type units Conc. QC Data DQO Note <br /> etals <br /> ercury 7470 ol/06/2010:2W143 Blank mglkg ND <0.03 <br /> LCS mg/kg 0.2398 86.9% 85-115 <br /> MS mg/kg 1 0.2398 77.9% 75-125 <br /> (SP 1000097-001) MSD mg/kg 0.2398 199% 75-125 435 <br /> MSRPD m 0.2398 67.8% :520 435 <br /> Definition <br /> CCV :Continuing Calibration Verification-Analyzed to verify the instrument calibration is within criteria. <br /> CCB :Continuing Calibration Blank-Analyzed to 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 of analyted.The recoveries <br /> are an indication of how that sample matrix affects analyte recovery. <br /> MSRPD :MS/MSD Relative Percent Difference(RPD)-The MS relative percent difference is an indication of precision far the preparation <br /> and analysis. <br /> ND :Non-detect.-Result was below the DQO listed for the analyte. <br /> DQO :Data alit Objective-This is the criteria a ainst which the ati control data is tom ared. <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 /> 435 : <br /> Sample matrix ina be affecting this analyte.Data was acts based on the LCS or CCV reconm. <br /> Page 7 of 7 <br />