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December 30,2015 Lab ID : STK1553148 San Joaquin Regional Rail Commission Customer : 3-17703 Quality Control-Inorganic Constituent Method Date/1D Type Units Cone. QC Data DQO Note Wet Chem Cyanide 450OCNCE 12/17/15:218315AMM CCB m -0.00088 0.004 Cyanide,Total 450OCNCE 12/16/15:214587AMM Blank mg/L ND <0.004 LCs mg/L 0.1000 95.6% 90-110 LCS mg/L 0.4000 102% 90-110 MS mg/L 0.05000 125% 26-226 (SP 1513507-002) MSD mg/L 0.05000 129% 26-226 MSRPD mg1L 0.05000 3.4% _<36 OD 5210B 12/04/15:300454CT RgBlk mg/L 0.03 2 LCS mg/L 198.0 103% 84.6-115 (STK1553223-002) Dup m 24.8% 15.9 440 5210B 12109/15:300456YKG CCV mg/L 1.000 99.0% 80 120 CCV ME 1.000 8.0% 80-120 Definition PDS PDS failed,matrix-Post Digestion Spike(PDS)not within Acceptance Range(AR)because of matrix interferences affecting this analyte.Data was accepted based on the LCS recovery. 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. RgBlk :Method Reagent Blank-Prepared to correct for any reagent contributions to sample result. 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. BS :Blank Spikes-A blank is spiked with a known amount of analyte.It is prepared to verify that the preparation process is not affecting analyte recovery. BSD :Blank Spike Duplicate of BS/BSD pair-A blank duplicate is spiked with a known amount of analyte.It is prepared to verify that the preparation process is not affecting analyte recovery. Dup :Duplicate Sample-A random sample with each batch is prepared and analyzed in duplicate.The relative percent difference is an indication ofprecision 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. BSRPD :BS/BSD Relative Percent Difference(RPD)-The BS 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. <y4 :High Sample Background-Spike concentration was less than one forth of the sample concentration. D O :Data Quality Objective-This is the criteria against which the quality control data is com ared. Explanation Ex :Post Digestion Spike(PDS)not within Acceptance Range(AR)because of matrix interferences affecting this analyte.Data was 430 accepted based on the LCS recovery. 440 :Sample nonhomogeneity may be affecting this analyte.Data was accepted based on the LCS or CCV recovery, Page 16 of 30