Field Approved Procedures and Technical Assistance

Facilities with Ammonia and/or Fluoride Monitoring Requirements

It is the responsibility of the permittee to ensure that monitoring is conducted according to test procedures approved under 40 CFR Part 136 even if the permittee does not operate the laboratory that performs the analytical testing on the waste stream. In terms of Ammonia Nitrogen and Fluoride monitoring, this means that the permittee must ensure that their effluent is appropriately characterized as to whether distillation is required. See the following Policy and Technical Assistance documents pertaining to Ammonia and Fluoride distillation. 

Approved Procedures for the Analysis of Field Parameters

These documents are intended to provide the approved procedures and requirements for measurement of field parameters. You may refer to the approved method reference, instrument manufacturer's manual or other resources for additional information. 

Field Parameter Reference Method(s)
Total Residual Chlorine : DPD Colorimetric SM 4500 Cl G-2011 and Hach 8167, 10250 and 10014 ULR 
Total Residual Chlorine : Regular Level Amperometric Titration SM 4500 Cl D-2011
Total Residual Chlorine: Low Level Amperometric Titration SM 4500 Cl E-2011
Free Available Chlorine: DPD Colorimetric SM 4500 Cl G-2011 and Hach 8021
Free Available Chlorine: Regular Level Amperometric Titration SM 4500 Cl D-2011
pH SM 4500 H+B-2011
Dissolved Oxygen SM 4500 O G-2011, Hach 10360, In Situ 1002-8-2009, ASTM D888-09 (B) and (C)
Temperature SM 2550 B-2010
Specific Conductance SM 2510 B-2011
Settleable Residue SM 2540 F-2011
Turbidity SM 2130 B-2011 and EPA 180.1
Salinity SM 2520 B-2011
VAR Option 5: Aerobic Processes at Greater than 40°C VAR Option 5
VAR Option 6: Addition of Alkali VAR Option 6
VAR Option 12: Raising the pH of Domestic Septage VAR Option 12

SOP Templates *COMING SOON- please check back*

These templates are provided to assist Field Laboratories in fulfilling the requirement of having an SOP for each Certified parameter. If choosing to use a template, they are to be filled out with each facility's specific information where applicable.

Field Parameter

Method

Total Residual Chlorine  SM 4500 Cl G-2011
Total Residual Chlorine  SM 4500 Cl D-2011
Total Residual Chlorine SM 4500 Cl E-2011
Free Available Chlorine SM 4500 Cl G-2011
   
pH SM 4500 H+B-2011
Dissolved Oxygen SM 4500 O G-2011
Temperature SM 2550 B-2010
Specific Conductance SM 2510 B-2011
Settleable Residue SM 2540 F-2011
Turbidity SM 2130 B-2011
Salinity SM 2520 B-2011
VAR Option 5: Aerobic Processes at Greater than 40°C VAR Option 5
VAR Option 6: Addition of Alkali VAR Option 6
VAR Option 12: Raising the pH of Domestic Septage VAR Option 12

Policies

Policies are regarded as required quality assurance practices and are meant to clarify existing legislative rules or to provide guidance where a legislative rule does not exist. They are intended to insure data produced is accurate, reliable and documented appropriately. Policies applicable to certified laboratories are found on this page of the Laboratory certification website. Policies with an asterisk ( * ) next to the title are applicable to Field Laboratory certification, depending on the Parameter Methods the Field Laboratory is certified for.

Tools for Field Laboratories

Item Revision Date Description
Example Benchsheet for Field Analyses 07/08/2019 An example of a worksheet used to record the information used to generate field testing results.
Fixed Pipettor Calibration Worksheet 05/21/2009 An Excel® spreadsheet for use when calibrating fixed-volume mechanical volumetric liquid-dispensing devices.
Adjustable Pipettor Calibration Worksheet 05/21/2009 An Excel® spreadsheet for use when calibrating adjustable volume mechanical liquid-dispensing devices.
Total Hardness (mg/L CaCO3) Calculator 06/16/2010 An Excel® spreadsheet for calculating Total Hardness (mg/L as CaCO3) using the Calcium and Magnesium values reported by your certified contract laboratory.
Free Available Chlorine (FAC) Curve Calculator 07/18/2018 An Excel® spreadsheet for calculating the  percent recoveries of standards used to verify the instrument calibration. The worksheet may also be used to document the process and satisfy record retention requirements.

Total Residual Chlorine (TRC) Curve Verification Calculator

01/11/2019 An Excel® spreadsheet for calculating the percent recoveries of standards used to verify the factory-set instrument calibration. The worksheet may also be used to document the process and satisfy record retention requirements.

TRC User-Generated Curve Calculator

01/11/2019 An Excel® spreadsheet for calculating the correlation coefficient and percent recoveries of standards used for instrument calibration with a user-generated curve. The worksheet may also be used to document the process and satisfy record retention requirements.

Guidance for Field Laboratories

Item Revision Date Description
LDO Daily Calibration Verification 06/16/2009 A document describing the procedure for verifying the calibration of Luminescence Dissolved Oxygen (LDO) meters with solubility table.
Pipettor Calibration Procedure 07/30/2009 An example gravimetric procedure for determining the measurement error of mechanical liquid-dispensing devices.
Total Residual Chlorine Instrument Sensitivity Letter 08/14/2001 A letter from the NC DWQ Point Source Branch Supervisor to NPDES Permittees requiring the use of instruments that will detect levels below permit discharge requirements.
Total Residual Chlorine Compliance Limit Memo 05/01/2008 A memo from the NC DWQ Point Source Branch Supervisor to NPDES Permittees regarding the TRC Compliance Limit of 50 µg/L.
Total Residual Chlorine Detection and Compliance Level Letter 03/11/2015 A letter from the NC WW/GW Laboratory Certification program restating the Division's policies for Total Residual Chlorine Detection and Compliance Levels.
Stormwater Permitting Letter on Field Lab Certification Requirements 02/14/2008 Only facilities classified in accordance with Classification of Water Pollution Control Systems Rules found in 15A NCAC 08G .0300 must be certified, however, monitoring of discharges under an NPDES permit (including stormwater) must be conducted in accordance with 40 CFR Part 136.
Corrective Action Response to Audit Findings Guidance 06/07/2017 A document describing the corrective action response and documentation needed for labs to address Findings from audits. 

 

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DMR Guidance Links

Link to National Pollution Discharge Elimination System (NPDES) Permitting Guidance and Directions for Completing a Discharge Monitoring Report (DMR). Look under Compliance Forms. You can also find a link to the Significant Figures and Their Use on DMRs document and list of Parameter Codes.[NOTE: The parameter code for any Fecal coliform regardless of technology (e.g., Colilert-18, MF, MPN/100 mL, etc.) code is now 31616]

DMR Units of Measure Descriptions - 2015

DMR Sample Type Code Descriptions - 2015

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