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<br />I <br />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 <br />groundwater that contain this element are included. <br />4- Method. Analytical method. EPA SW-846. Methods for Evaluating Solid Waste, Third Edition (Septeml <br />1986), and Update No. 1 (August, 1993). <br />5- Type. General type of analytical method. GC = gas chromatography. LC = liquid chromotography. GC <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 <br />determined to be statistically different from a blank, and is numerically defined a$ three times the stand; <br />deviation of seven replicate measurements. ThejLOD must be determined for each parameter, and is spec <br />to the individual laboratory. <br />7- LOO. Level of quantitation. The level of quantitation is here-defined as the level above which quantitat <br />results may be obtained with a specified degree of confidence, and numerically defined as 10 times i <br />standard deveation of seven replicate measurements. The LOQ must be determined for each parameter, a <br />is specific to the individual laboratory. <br />8- PQL Practical quantification limit. The practical quantification limit is an interiaboratory concept and <br />numerically estimated at 5 to 10 times the method detection limit. The PQL is derived from iaboratc <br />performance, under ideal circumstances, of selected laboratories (not all laboratories). The PQL provid, <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 <br />DEHNR.