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Attachment B <br />Explanation of QC Qualifier Codes <br />Qualifier Meaning <br />RIN (EPA)-Re-Analyzed: The indicated analytical results were generated from <br />a reinjection of the same sample extract or aliquot. <br />(ESC) - Additional QC Info: The sample concentration is too high [o <br />evaluate accurate spike recoveries. <br />Qualifier Report Information <br />ESC utilizes sample and result qualifiers a9 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 concezning <br />the potential bias of reported data. Because of the wide range of conat ituenta and variety of <br />matrices incorporated by moat EPA methods,it is cortunon for aome 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 />Def initiona <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 chromotography to analytea of interest. The 6urrogates 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 carYied through all stages of preparation and analyses. <br />Control Limi to (AQ) (SS) <br />2-Fluorophenol 31-119 Nitrobenzene-d5 43-118 Dibromf luoromethane 68-128 64-125 <br />Phenol-d6 12-134 2-Fl uorobiphenyl 96-128 Toluene-de 76-115 69-118 <br />2,4,6-TribYOmophe»ol 51-141 Terphenyl-d14 43-137 4-Biomof luOrobenzene T9-127 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 6 of 6 <br />