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14 <br />NOTES <br />NOTES PERTAINING TO COLUMN LABELS <br />1 - Common name of parameter, <br />2- Class. General type of compound, <br />3- CAS RN. Chemical Abstracts Service Registry. Where 'Total' is entered (metals), all species in th <br />groundwater that contain this element are included. <br />4- Method. Analyfical method, EPA SW-846. Methods for Evaluating Solid Waste, "third Edition (September <br />1986), and Update No. 1 (August, 1993). <br />5- Type. General type of analytical method. GC = gas chromatography. LC = liquid chromotography. GCM: <br />= gas chromatography / mass spectrometry, FRN = furnace. <br />6- LOD. Limit of detection. The limit of detection is here defined as the lowest concentration that can bi <br />determined to be statistically different from a blank, and is numerically defined as three times the standarc <br />deviation of seven replicate measurements. TherLOD must be determined for each parameter, and is specific <br />to the individual laboratory. <br />7 LOQ. Level of quantitation. The level of quantitation is here'defined as the level above which quantitative <br />results may be obtained with a specified degree of confidence, and numerically defined as 10 times the <br />standard deveation of seven replicate measurements. The LOQ must be determined for each parameter, anc <br />Is specific to the Individual laboratory. <br />8- PQL. Practical quantification IimiL The practical quantification limit is an interiaboratory concept and is <br />numerically estimated at 5 to 10 times the method detection I1mIL The PQL is derived from laboratory <br />performance, under ideal circumstances, of selected laboratories (not all laboratories). The PQL provides <br />routine performance goals that many laboratories must strive to achieve. <br />9- GWS. Groundwater Protection Standard. NCDEHNR. Subject to change without notice as directed b} <br />DEHNR. <br />