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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 the <br />groundwater that contain this element are included. <br />4 - Method. Analytical '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. GCMS <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 be <br />determined to be statistically different from a blank, and ~s numerically defined as three times the standard <br />deviation of seven replicate measurements. The}LOD must tze determined for each parameter. and is specific <br />to the individual Laboratory. <br />7 - ~ LOQ. Level of quantitation. The level of quantitative 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, and <br />is spedfic to the individual laboratory. <br />8 - PQL Practical quantification limfi. The practical quantification limit is an interiaboratory concept and is <br />numericagy estimated at 5 to 10 times the method detecction limit. 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 by <br />DEHNR. <br />w . <br />