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December 30,2015 Lab ID : STK1553148 San Joaquin Regional Rail Commission Customer : 3-17703 Inorganic-Metals QC The following note applies to Zinc: 3010 430 Post Digestion Spike(PDS)not within Acceptance Range(AR)because of matrix interferences affecting this analyte.Data was accepted based on the LCS recovery. Organic QC 12/10/2015:218018 All analysis quality controls are within established criteria,except: 624 The following note applies to Acrolein,Acrylonitrile,Bromomethane(Methyl Bromide): 360 CCV above Acceptance Range(AR).Samples which were non detect for this analyte were accepted. 12/10/2015:214429 All preparation quality controls are within established criteria,except: The following note applies to 2-Chloroethylvinyl ether,Acrolein,Acrylonitrile,Bromoform,Bromomethane (Methyl Bromide),Vinyl Chloride: 435 Sample matrix may be affecting this analyte.Data was accepted based on the LCS or CCV recovery. 625 12/23/2015:218634 All analysis quality controls are within established criteria. 12/23/2015:218835 All analysis quality controls are within established criteria,except: The following note applies to Benzidine: 360 CCV above Acceptance Range AR).Samples which were non detect for this analyte were accepted. 12/09/2015:214306 All preparation quality controls are within established criteria,except: The following note applies to 3,3-Dichlorobenzidine,Hexachloroethane,Nitrobenzene,Phenol-d6, Diethylphthalate,Dimethylphthalate: 436 Blank Spike(BS)not within Acceptance Range(AR).Data was accepted based on the LCS or CCV recovery. The following note applies to bis(2-Ethylhexyl)phthalate,Diethylphthalate,Dimethylphthalate,Di-n- butylphthalate: 410 Relative Percent Difference(RPD)not within Maximum Allowable Value(MAV).Data was accepted based on the LCS or CCV recovery. The following note applies to Phenol-d6: 310 LCS above Acceptance Range(AR).Samples which were non detect for this analyte were accepted. Inorganic-Wet Chemistry QC 1664 12/29/2015:215013 All preparation quality controls are within established criteria. 12/30/2015:214860 All preparation quality controls are within established criteria. 2540D 12/03/2015:312548 All preparation quality controls are within established criteria. i JL4500CNCE 12/17/2015:218315 All analysis quality controls are within established criteria. Page 2 of 30