Policies The following table provides a list of interpretive rules and policy statements issued by the NC WW/GW Laboratory Certification Branch (LCB). They are meant to clarify existing legislative rules or to provide guidance where a rule does not exist. Where multiple editions of a single reference source may be approved for reporting purposes and where these approved methods may have conflicting or unclear requirements, the NC WW/GW LCB may adopt a single policy based on a single edition to provide consistency in analytical reporting. Even when citing an alternate reference edition, laboratories must adhere to the NC WW/GW LCB policy requirement. Policy names with an asterisk (* ) beside them notate that the policy could be applicable to Field Laboratory certification, depending upon the parameter methods on the laboratory's Certified Parameter Listing Parameter Policy Revision General Quality Control Correlation Coefficient for Linear Calibration Curves * 12/2014 General Quality Control Electrode Slope/Efficiency Documentation 10/2013 General Quality Control Electronic Signature and Data Storage Policy * 4/2020 General Quality Control Factory Set Curve Verification * 10/2018 General Quality Control Manual Integration 4/2010 General Quality Control Sample Collection, Preservation and Receipt Requirements * 2/2022 General Quality Control Temperature-Measuring Devices Used for Laboratory Operations Policy * 8/2021 General Quality Control Titrant Standardization * 5/2019 General Quality Control Traceability Documentation Requirements for Chemicals, Reagents, Standards and Consumables * 3/2020 General Quality Control SW-846 Method Implementation 7/2020 General Quality Control Analytical Balance Weights Verification * 4/2020 General Quality Control Matrix Spike 5/2020 General Quality Control Chemical, Reagent, Standard and Consumable Expiration Policy* 4/2022 General Quality Control Duplicate Sample Analyses for Field Parameters Policy* 3/2020 General Quality Control Mechanical Volumetric Liquid-Dispensing Devices Calibration Policy* 7/2021 General Quality Control PT Samples Analyzed and Documented Same as Compliance Samples Policy* 3/2022 General Quality Control Second Source Standard 9/2021 General Quality Control Inline Meter Calibration Verification* 9/2021 Ammonia/Fluoride Distillation* 4/2019 Bacteria Quanti-Tray Sealer Check 1/2022 Bacteria Fecal Coliform MF Consumables Testing 8/2021 Bacteria Fecal Coliform MF Reporting 5/2019 Bacteria Bacteriological Sample Bottle Sterility Test 1/2022 Bacteria Coliform MF Culture Positive 6/2022 Bacteria Bacteriological Reagent Water Testing 2/2018 Bacteria Fecal Sludge MPN Analysis Protocol 8/2021 BOD/CBOD Flagging QC Failures in BOD Data 8/2021 BOD/CBOD BOD - Checking DO Meter for Drift 8/2021 BOD/CBOD Reporting Limit Policy 8/2021 BOD/CBOD Neutralizing Total Residual Chlorine in BOD Samples 8/2021 Chlorophyll Chlorophyll Sample Collection, Preservation and Holding Time Policy 2/2020 Dissolved Oxygen Dissolved Oxygen Meter Calibration Policy * 4/2020 Free Available Chlorine FAC Hold Time * 6/2019 pH SW-846 pH Calibration Verification * 2/2020 Residue TSS Reporting Limit 9/2014 Residue TS and TDS Reporting Limit 3/2009 Residue Method Blank Requirement for Residues 7/2021 Residue Anti-static Device Requirement for Total and Total Dissolved Solids 6/2021 Residue Residue Oven Temperature Documentation 7/2021 Turbidity Turbidity Standards * 12/2007 TRC Total Residual Chlorine - Sealed Standards in a Field Setting * 10/2017 VAR Option 3 DO Measurement 9/2018 VAR Option 3 Minimum Sample Volume 9/2018 VAR Option 3 Documentation Requirements 6/2022 If you see something that should be corrected or have any questions about the content of the site, contact the site administrator; or (919) 733- 3908 x259.