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April 4 2012 Lab ID : STK1232392 San Joaquin County Solid Waste Customer : 3-2956 Quality Control -Inorganic Constituent Method Date/ID Type Units Conc. QC Data DQO Note Wet Chem OD 5220B 03/30/12:203479SBL MSRPD m 200.0 1.1% :513.4 5220D 03/30/12:204607SBL CCB m9/1- 4.9 20 CCB mg/L 1.8 20 CCV mg/L 200.0 78.8% N/A 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. 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 quality control data is compared. Explanation 440 :Sample nonhomogeneity may be affecting this analyte.Data was accepted based on the LCS or CCV recov Page 9 of 14