Laserfiche WebLink
i <br /> 1 <br /> rw Attachment B k <br /> Explanation of QC Qualifier Codes <br /> Qualifier Meaning <br /> 4 <br /> 3 (EPA) - Estimated value below the lowest calibration point. Confidence <br /> correlates with concentration. <br /> Qualifier Report Information h <br /> M <br /> ESC utilizes sample and result qualifier's 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 /> k 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 i <br /> matrices incorporated by most EPA methods,it is common 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 /> i <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 /> Illrrr��� 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 analytes of interest. The surrogates are used to I <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 /> k TIC - Tentatively Identified Compound: Compounds detected in samples that are <br /> not target compounds, internal standards, system monitoring compounds, <br /> or surrogates. y <br /> } <br /> irk <br /> i <br /> I <br /> 1 <br /> ' I <br /> 1 <br /> I <br /> ' I <br /> C� _ <br /> Page 13 of 13 <br /> i <br /> i <br /> a <br /> y <br />