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February 20, 2019 Lab ID : STK1931316 Aramark Uniform- Customer : 3-17510 Quality Control- Organic Constituent Method Date/ID Type Units Cone. QC Data DQO Note Organic Vinyl Chloride 5030B 02/18/19:201789VRG Blank ug/L ND <0.5 ExBlk u /L 0.000 12.5 1,1-Dichloroeth lene 8260B 02/18/19:202481VRG CCV u /L 25.00 99.3% 80-120 1,2-Dichloroethane(EDC) 8260B 02/18/19:202481VRG CCV ug/L 25.00 76.1% 70-130 1,2-Dichloroethane-d4 8260B 02/18/19:202481VRG CCV u /L 25.00 86.0% 70-130 1,4-Dichlorobenzene 8260B 02/18/19:202481VRG CCV ug/L 25.00 105% 70-130 Butanone(MEK) 8260B 02/18/19:202481VRG CCV u /L 30.00 265% 50-150 360 Bromofluorobenzene(BFB) 8260B 02/18/19:202481VRG CCV ug/L 25.00 105% 70-130 enzene 8260B 02/18/19:202481VRG CCV u /L 25.00 101% 70-130 Carbon Tetrachloride 8260B 02/18/19:202481VRG CCV ug/L 25.00 79.1% 70-130 Chlorobenzene 8260B 02/18/19:202481VRG CCV u /L 25.00 92.9% 70-130 Chloroform 8260B 02/18/19:202481VRG CCV ug/L 25.00 97.4% 80-120 ibromofluromethane 8260B 02/18/19:202481VRG CCV u /L 25.00 98.0% 70-130 Tetrachloroethylene(PCE) 8260B 02/18/19:202481VRG CCV ug/L 25.00 84.1% 70-130 Toluene-d8 8260B 02/18/19:202481VRG CCV u /L 25.00 114% 70-130 Trichloroethylene(TCE) 8260B 02/18/19:202481VRG CCV ug/L 25.00 91.2% 70-130 Vinyl Chloride 8260B 02/18/19:202481VRG CCV a /L 25.00 112% 80-120 4,5-Trichlorophenol 8270C 02/15/19:202152SBL CCV mg/L 20.00 126% 70-130 4,6-Tribromo henol 8270C 02/15/19:202152SBL CCV m 20.00 109% 70-130 4,6-Trichlorophenol 8270C 02/15/19:202152SBL CCV mg/L 20.00 107% 80-120 4-Dinitrotoluene 8270C 02/15/19:202152SBL CCV m 20.00 104% 70-130 Fluorobiphenyl 8270C 02/15/19:202152SBL CCV mg/L 10.00 101% 70-130 Fluoro henol 8270C 02/15/19:202152SBL CCV m 20.00 93.1% 70-130 Methylphenol 8270C 02/15/19:202152SBL CCV mg/L 20.00 119% 70-130 Meth 1 henol 8270C 02/15/19:202152SBL CCV m 20.00 116% 70-130 exachlorobenzene 8270C 02/15/19:202152SBL CCV mg/L 20.00 112% 70-130 exachlorobutadiene 8270C 02/15/19:202152SBL CCV m 20.00 112% 80-120 exachloroethane 8270C 02/15/19:202152SBL CCV mg/L 20.00 106% 70-130 Nitrobenzene 8270C 02/15/19:202152SBL CCV m 20.00 104% 70-130 Nitrobenzene-d5 8270C 02/15/19:202152SBL CCV mg/L 10.00 99.6% 70-130 Pentachlorophenol 8270C 02/15/19:202152SBL CCV m 20.00 106% 80-120 Phenol-d6 8270C 02/15/19:202152SBL CCV mg/L 20.00 94.3% 70-130 Te hen 1-dl4 8270C 02/15/19:202152SBL CCV m 10.00 98.9% 70-130 Pyridine 8270C 02/15/19:202152SBL CCV mg/L 20.00 111% 70-130 Definition CCV :Continuing Calibration Verification-Analyzed to verify the instrument calibration is within criteria. Blank :Method Blank-Prepared to verify that the preparation process is not contributing contamination to the samples. ExBlk :TCLP/STLC Extraction 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. 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. 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. DQO :Data Quality Objective-This is the criteria against which the quality control data is compared. Page 8 of 11