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Attachment 8 <br />Explanation of QC Qualifier Codes <br />Qualifier Meaning <br />S2 Surrogate recovery limits have been exceeded; values are outside lower <br />control limits <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 moat 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 />reeulte. Each qualifier ie 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 />matrices incorporated by most EPA methods,it is common for some conq~ounda 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 sample to the <br />true value of a ]mown 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 reeulte are and ie represented by <br />Relative Percent Differreace. <br />Surrogate - organic compounds that are similar in chemical conq~oeition, extraction, <br />and chromotography to analytee of interest. The surrogates are used to <br />determine the probable response of the group of analytes that aze 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 68-125 64-125 <br />Phenol-d5 12-134 2-Fluorobiphenyl 45-125 Toluene-d8 76-115 69-118 <br />2,4,6-Tribromophenol 51-141 Terphenyl-d14 43-137 4-Hromofluorobenzene 79-127 61-134 <br />TIC - Tentatively Identified Compound: Compounds detected in samples that are <br />not target con~pounde, internal standards, system monitoring compounds, <br />or surrogatee. <br />Page 8 of 8 <br />