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1 Attachment B <br /> Explanation of QC Qualifier Codes <br /> Qualifier Meaning <br /> E GTL (EPA) - Greater than upper calibration limit Actual value is known to <br /> I be greater than the upper calibration range <br /> J4 The associated batch QC was outside the established quality control range <br /> for accuracy <br /> 0 (ESC) Sample diluted due to matrix interferences that impaired the ability <br /> to make an accurate analytical determination The detection limit is <br /> elevated in order to reflect the necessary dilution <br /> Qualifier Report Information <br /> ESC utilizes sample and result qualifiers as set forth by the EPA Contract Laboratory Program and <br /> as 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 is designated in the qualifier explanation as 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 /> l matrices incorporated by most EPA methods,it is common for some compounds to fall outside of <br /> SII established ranges These exceptions are evaluated and all reported data is valid and useable <br /> unless qualified as 'R' (Re3ected) <br /> Definitions <br /> Accuracy - The relationship of the observed value of a known sample to the <br /> true value of a known sample Represented by percent recovery and <br /> relevant to samples such as control samples, 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 chromatography to analytes of interest The surrogates are used to <br /> determine the probable response of the group of analytes that are chem- <br /> ically related to the surrogate compound Surrogates are added to the <br /> sample and carried through all stages of preparation and analyses <br /> Control Limits (AQ) (SS) <br /> 2-Fluorophenol 31-119 Nitrobenzene-d5 43-118 Dibromfluoromethane 68-128 64-125 <br /> Phenol-d5 12-134 2-Fluorobiphenyl 45-128 Toluene-d8 76-115 69-118 <br /> 2,4,6-Tribromophenol 51-141 Terphenyl-d14 43-137 4-Brcmofluorobenzene 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 /> �S <br /> � 1 <br /> �J <br /> I Page 27 of 27 <br /> 1 <br /> �� r <br />