NC Department of Environment and Natural Resources
Water Quality - Approved Methods Info
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Additional Information About Method and Parameter ApprovalsThis page lists letters and memorandums of approval for methods by various authorities including the Director of the Division of Water Quality, EPA and the Division of Waste Management UST and Solid Waste Sections. A Note About Individual Organic Analyte CertificationWe often receive requests for certification for individual organic analytes. The NC WW/GW LC program is a method certification program and we do not certify for individual organic analytes. If the laboratory holds certification for a method in which the analyte is published within the scope of that method, the laboratory is considered to be certified for analysis of that analyte. In the case where the analyte of interest is not within the scope of a published certifiable method (an example of this would be Tetrahydrofuran by SW-846 Method 8260 B), the laboratory is advised to maintain Method Detection Limit (MDL) and Initial Demonstration of Capability (IDOC) study summary data on file at the laboratory and follow the quality control requirements outlined in the reference method. Any questions (such as whether an analyte of interest may be reported as a Tentatively Identified Compound [TIC] or whether is must be quantitated) should be directed to the regulatory agency receiving the data. This office does not have the authority to certify or otherwise offer any approval for analysis of individual analytes not within the scope of a certifiable method. Ferrous IronThe NC WW/GW LC program does not have the authority to certify specifically for the Ferrous state of Iron. We do certify for Total Iron by a method that also allows for measurement of the ferrous state (i.e., Standard Methods 3500-Fe B, 20th Edition and beyond). To measure the ferrous state, however, samples must be analyzed at the sampling site. The program will only certify:
Data analyzed, reported and qualified as out of hold time is unusable for the regulatory data receivers' objectives. For Approved Procedures for the Analysis of Field ParametersClick here to link to the approved procedures for Total Residual Chlorine, pH, Dissolved Oxygen, Specific Conductance, Termperature and Settleable Residue. DWQ Director Approval Letters for Additional Certifiable Parameters
DWQ Point Source Branch Letters
EPA Approval Letters
Division of Waste Management - UST and Solid Waste Section Guidelines
Aquifer Protection Section
Additional LinksInformation on the Methods Update Rule (MUR) Information on the use of Discrete Analyzers Information on SW-846 Updates IVA and IVB Information on Horizon EPA Method 1664 A Compliance Options
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