Laserfiche WebLink
Attachment B <br />Explanation of QC Qualifier Codes <br />Qualifier Meaning <br />J6 The sample matrix interfered with the ability to make any accurate <br />determination; spike value is low <br />Qualifier Report Information <br />ESC utilizes sample and result qualifiers as set forth by the EPA Contract Laboratory Progzam and <br />ae required by most certifying bodies including NELAC. In addition to the EPA qualifiers adopted <br />by ESC, we have implemented ESC qualifiers to provide more information pertaining to our analytical <br />results. Each qualifier ie designated in the qualifier explanation ae either EPA or ESC. <br />Data qualifiers are intended to provide the ESC client with more detailed information concerning <br />the potential bias of reported data. Because of the wide range of constituents and variety of <br />matrices incorporated by most EPA methode,it is cortnan for some compounds to fall outside of <br />established ranges. These exceptions are evaluated and all reported data is valid and useable <br />unless qualified as 'R' (Rejected). <br />Definitions <br />Accuracy - The relationship of the observed value of a known san~le to the <br />true value of a known sample. Represented by percent recovery and <br />relevant to samples such ae: control sart~les, matrix spike recoveries, <br />surrogate recoveries, etc. <br />Precision - The agreement between a set of samples or between duplicate samples. <br />Relates to how close together the results are and is represented by <br />Relative Percent Differrence. <br />Surrogate - Organic compounds that are similar in chemical composition, extraction, <br />and chromotography to analytee of interest. The surrogates are used to <br />determine the probable response of the group of analytee that are chem- <br />ically related to the surrogate compound. Surrogates are added to the <br />sample and carried through all stages of preparaCion and analyses. <br />Control Limits (AQ) (SS) <br />2-Fluorophenol 31-119 Nitrobenzene-d6 43-118 Dibromfluoromethane 6H-128 64-125 <br />Phenol-d5 12-134 2-Fluorobiphenyl 45-128 Toluene-d8 76-115 69-11s <br />2,4,6-Tribroniophenol 51-141 Terphenyl-d14 43-137 4-Bromo£luorobenzene 79-127 61-134 <br />TIC - Tentatively Identified Compound: Compounds detected in samples that are <br />not target compounds, internal standards, system monitoring compounds, <br />or surrogates. <br />Page 3 of 3 <br />