15A NCAC 02B .0508
Tests and Measurements Applicable to Sics
Effective May 1, 2020G.S. 143-215.3(a)(1); 143-215.64; 143-215.65; 143-215.66Environmental Quality
(a) Determination of Type and Frequency of Tests and Measurements:
- (1) Introduction. The tables set forth in this Rule are designed to indicate, for any particular water pollution control facility or point source, the minimum standard tests and measurements that are to be performed, the minimum frequency with which the tests and measurements are to be conducted, and the location and minimum number of sampling points that are required.
- (2) Determination of Facility Class and SIC Numbers. Before the tables set forth in this Rule may be applied, the standard industrial classification(s) of the activities discharging to the water pollution control facility must be determined from The Standard Industrial Classification (SIC) Manual. The classification of the facility as determined by the Water Pollution Control System Operators Certification Commission, must also be known.
(b) Modification of Test(s) or Measurement(s) Requirements:
- (1) If any of the tests and measurements, sampling points, or frequency of sampling requirements, as required in this Rule for a particular SIC group, are not applicable to the discharge of a particular water pollution control facility, or if it can be demonstrated that the objectives of this Section can be achieved by other acceptable means, then such requirements may be waived or modified to the extent that the Director determines to be appropriate.
- (2) In addition to the tests and measurements as listed in this Rule applicable to each of the SIC groups, persons subject to this Section may be required to perform such additional tests and measurements at such sampling points and with such frequency as are determined by the Director to be necessary to characterize constituents of the waste discharge and their effect upon the receiving waters. This monitoring may include but not be limited to weekends and holidays to ensure representative sampling and proper operation and maintenance of any facility.
(c) Unclassified Activities:
- (1) Any person owning or operating a water pollution control facility who determines that a major SIC group(s) is not listed in this Rule for an activity subject to this Section shall so notify the Division.
- (2) The Director shall prescribe on a case-by-case basis the number and location of sampling points and the frequency with which tests and measurements must be made to characterize the quantity or quality of waste discharges resulting from any activity subject to this Section that is not included in the major SIC groups set forth in this Rule and to characterize the effects of the discharges upon the waters of this state.
(d) Index of Major Standard Industrial Groups:
(1) Monitoring Requirements
- (A) All facilities equal to or greater than 50,000 gpd, shall monitor for total N and P.
- (B) Facilities less than 50,000 gpd shall monitor for total N and P when discharging into nutrient sensitive waters as designated by the Division.
(2) Monitoring frequency for total N and P is based on river subbasins in two separate areas of the state as follows:
(A) Western area includes the French Broad, Broad, Savannah, New, Watauga, Little Tennessee, and Hiwassee:
- (i) 50,000 gpd or higher Semi-annually
- (ii) 1,000,000 gpd or higher Quarterly.
Facility Design Capacity: Frequency
(B) Piedmont and Eastern area includes the Catawba, Lumber, Yadkin, Cape Fear, Chowan, Neuse, Pasquotank, Roanoke, Tar-Pamlico, and White Oak:
- (i) 50,000 gpd or higher Quarterly
- (ii) 1,000,000 gpd or higher Monthly.
Facility Design Capacity Frequency
(3) Definition for Total Nitrogen and Total Phosphorus:
- (A) Total Nitrogen shall be the sum of total Kjeldahl nitrogen, nitrate nitrogen, and nitrite nitrogen expressed as "N" in milligrams per liter (mg/L).
(B) Total Phosphorus shall include all orthophosphates and condensed phosphates, both dissolved and particulate, organic and inorganic, expressed as "P" in milligrams per liter (mg/L).
** Specific test type, conditions, and limitations shall be defined by permit. Toxicity limits shall be applied to all major discharges and all discharges of complex wastewater. Toxicity limitations and monitoring requirements may be applied to permits for other discharges when such discharge may impair the best use of the receiving water by the discharge of toxic substances in toxic amounts.
Specific frequency shall be defined by individual permit conditions. For most facilities with continuous and regularly occurring discharges, frequency will be defined as a minimum of quarterly.
SIC Number Major Products or Services
1400-1499 Mining
2000-2199 Food, Beverage and Tobacco Processing
2200-2299 Textile Processing
2400-2599 Lumber and Wood Products Except Wet Decking
2600-2699 Paper and Allied Products
2800-2899 Chemical and Allied Products
2900-2999 Petroleum Refining and Related Industries
3100-3199 Leather and Leather Products
3400-3699 Fabricated Metal Products Except Ordnance, Machinery and Transportation Equipment
Machinery Electrical Machinery, Equipment and Supplies
4900-4939 Electric, and Gas Services
4941 Water Supply
4952 Wastewater and all facilities discharging primarily domestic wastewater
7000-8999 Services
Abbreviations for sampling locations and frequencies to be used with SIC monitoring requirements:
"I" means influent "E" means effluent "U" means upstream "D" means downstream
"2/month" means samples are collected twice per month with a required 10 day interval between the collection of the samples
"3/week" means samples are collected three times per week on three separate days
MINING
MINIMUM REQUIREMENTS FOR SIC 1400-1499
REQUIRED TEST LOCATION FREQUENCY CLASS CLASS CLASS CLASS I II III IV 1. Turbidity E Monthly Monthly Monthly Monthly 2. Settleable Matter E Monthly Monthly Monthly Monthly 3. TSS E Monthly Monthly Monthly Monthly 4. pH E Monthly Monthly Monthly Monthly 5. Toxics and Toxicity ** ** ** ** 
FOOD AND BEVERAGE PROCESSING AND TOBACCO PROCESSING
MINIMUM REQUIREMENTS FOR SIC 2000-2199
EFFLUENT LIMITED
REQUIRED TEST LOCATION FREQUENCY CLASS CLASS CLASS CLASS I II III IV 1. pH E Weekly Weekly 3/week Daily 2. Temperature, °C E Weekly Weekly 3/week Daily 3. BOD, 5-day, 20°C E 2/month Weekly 3/week Daily 4. TSS E 2/month Weekly 3/week Daily 5. Ammonia Nitrogen E Monthly 2/month Weekly Weekly 6. Total Nitrogen E * * * * 7. Total Phosphorus E * * * * 8. Toxics and Toxicity ** ** ** ** WATER QUALITY LIMITED
1. Dissolved Oxygen E Weekly Weekly 3/week Daily 2. Dissolved Oxygen U,D Weekly Weekly 3/week+ 3/week+ 3. pH E Weekly Weekly 3/week Daily 4. Temperature, °C E Weekly Weekly 3/week Daily 5. Temperature, °C U,D Weekly Weekly 3/week+ 3/week+ 6. BOD, 5-day, 20°C E 2/month Weekly 3/week Daily 7. TSS E 2/month Weekly 3/week Daily 8. Ammonia Nitrogen E 2/month Weekly 3/week Daily 9. Total Nitrogen E * * * * 10. Total Phosphorus E * * * * 11. Toxics and Toxicity ** ** ** ** 12. Conductivity E Weekly Weekly 3/week Daily 13. Conductivity U,D Weekly Weekly 3/week+ 3/week+ 
TEXTILE PROCESSING
MINIMUM REQUIREMENTS FOR SIC 2200-2299
EFFLUENT LIMITED
REQUIRED TEST LOCATION FREQUENCY CLASS CLASS CLASS CLASS I II III IV 1. pH E Weekly Weekly 3/week Daily 2. Temperature, °C E Weekly Weekly 3/week Daily 3. BOD, 5-day, 20°C E 2/month Weekly 3/week Daily 4. COD E 2/month Weekly 3/week Daily 5. TSS E 2/month Weekly 3/week Daily 6. Total Nitrogen E * * * * 7. Total Phosphorus E * * * * 8. Toxics and Toxicity ** ** ** ** WATER QUALITY LIMITED
REQUIRED TEST LOCATION FREQUENCY CLASS CLASS CLASS CLASS I II III IV 1. Dissolved Oxygen E Weekly Weekly 3/week Daily 2. Dissolved Oxygen U,D Weekly Weekly 3/week+ 3/week+ 3. pH E Weekly Weekly 3/week Daily 4. Temperature, °C E Weekly Weekly 3/week Daily 5. Temperature, °C U,D Weekly Weekly 3/week+ 3/week+ 6. BOD, 5-day, 20°C E 2/month Weekly 3/week Daily 7. COD E 2/month Weekly Weekly Weekly 8. TSS E 2/month Weekly 3/week Daily 9. Total Nitrogen E * * * * 10. Total Phosphorus E * * * * 11. Toxics and Toxicity ** ** ** ** 12. Conductivity E Weekly Weekly 3/week Daily 13. Conductivity U,D Weekly Weekly 3/week+ 3/week+ 
LUMBER AND WOOD PRODUCTS (EXCLUDING WET DECKING)
MINIMUM REQUIREMENTS FOR SIC 2400-2599
EFFLUENT LIMITED
REQUIRED TEST LOCATION FREQUENCY CLASS CLASS CLASS CLASS I II III IV 1. pH E Weekly Weekly 3/week Daily 2. Temperature, °C E Weekly Weekly 3/week Daily 3. BOD, 5-day, 20°C E 2/month Weekly 3/week Daily 4. COD E Monthly 2/month Weekly 3/week 5. Total Phenols E 2/month Weekly 3/week Daily 6. TSS E 2/month Weekly 3/week Daily 7. Total Nitrogen E * * * * 8. Total Phosphorus E * * * * 9. Toxics and Toxicity ** ** ** ** WATER QUALITY LIMITED
1. Dissolved Oxygen E Weekly Weekly 3/week Daily 2. Dissolved Oxygen U,D Weekly Weekly 3/week+ 3/week+ 3. pH E Weekly Weekly 3/week Daily 4. Temperature, 0C E Weekly Weekly 3/week Daily 5. Temperature, 0C U,D Weekly Weekly 3/week+ 3/week+ 6. BOD, 5-day, 200C E 2/month Weekly 3/week Daily 7. COD E 2/month Weekly 3/week Daily 8. Total Phenols E 2/month Weekly 3/week Daily 9. TSS E 2/month Weekly 3/week Daily 10. Total Nitrogen E * * * * 11. Total Phosphorus E * * * * 12. Toxics and Toxicity ** ** ** ** 13. Conductivity E Weekly Weekly 3/week Daily 14. Conductivity U,D Weekly Weekly 3/week+ 3/week+ 
PAPER AND ALLIED PRODUCTS
MINIMUM REQUIREMENTS FOR SIC 2600-2699
EFFLUENT LIMITED
REQUIRED TEST LOCATION FREQUENCY CLASS CLASS CLASS CLASS I II III IV 1. pH E Weekly Weekly 3/week Daily 2. Temperature, °C E Weekly Weekly 3/week Daily 3. BOD, 5-day, 20°C E 2/month Weekly 3/week Daily 4. TSS E 2/month Weekly 3/week Daily 5. Total Nitrogen E * * * * 6. Total Phosphorus E * * * * 7. Toxics and Toxicity ** ** ** ** WATER QUALITY LIMITED
1. Dissolved Oxygen E Weekly Weekly 3/week Daily 2. Dissolved Oxygen U,D Weekly Weekly 3/week+ 3/week+ 3. pH E Weekly Weekly 3/week Daily 4. Temperature, °C E Weekly Weekly 3/week Daily 5. Temperature, °C U,D Weekly Weekly 3/week+ 3/week+ 6. BOD, 5-day, 20°C E 2/month Weekly 3/week Daily 7. TSS E 2/month Weekly 3/week Daily 8. Total Nitrogen E * * * * 9. Total Phosphorus E * * * * 10. Toxics and Toxicity ** ** ** ** 11. Conductivity E Weekly Weekly 3/week Daily 12. Conductivity U,D Weekly Weekly 3/week+ 3/week+ 
CHEMICAL AND ALLIED PRODUCTS
MINIMUM REQUIREMENTS FOR SIC 2800-2899
EFFLUENT LIMITED
REQUIRED TEST LOCATION FREQUENCY CLASS CLASS CLASS CLASS I II III IV 1. pH E Weekly Weekly 3/week Daily 2. Temperature, °C E Weekly Weekly 3/week Daily 3. BOD, 5-day, 20°C E 2/month Weekly 3/week Daily 4. TSS E 2/month Weekly 3/week Daily 5. Total Nitrogen E * * * * 6. Total Phosphorus E * * * * 7. Toxics and Toxicity ** ** ** ** WATER QUALITY LIMITED
1. Dissolved Oxygen E Weekly Weekly 3/week Daily 2. Dissolved Oxygen U,D Weekly Weekly 3/week+ 3/week+ 3. pH E Weekly Weekly 3/week Daily 4. Temperature, °C E Weekly Weekly 3/week Daily 5. Temperature, °C U,D Weekly Weekly 3/week+ 3/week+ 6. BOD, 5-day, 20°C E 2/month Weekly 3/week Daily 7. TSS E 2/month Weekly 3/week Daily 8. Total Nitrogen E * * * * 9. Total Phosphorus E * * * * 10. Toxics and Toxicity ** ** ** ** 11. Conductivity E Weekly Weekly 3/week Daily 12. Conductivity U,D Weekly Weekly 3/week+ 3/week+ 
PETROLEUM REFINING AND RELATED INDUSTRIES
MINIMUM REQUIREMENTS FOR SIC 2900-2999
EFFLUENT LIMITED
REQUIRED TEST LOCATION FREQUENCY CLASS CLASS CLASS CLASS I II III IV 1. pH E Weekly Weekly 3/week Daily 2. Temperature, °C E Weekly Weekly 3/week Daily 3. BOD, 5-day, 20°C E 2/month Weekly 3/week Daily 4. TSS E 2/month Weekly 3/week Daily 5. Total Phenols E 2/month Weekly 3/week Daily 6. Oil and Grease E 2/month Weekly 3/week Daily 7. Total Nitrogen E * * * * 8. Total Phosphorus E * * * * 9. Toxics and Toxicity ** ** ** ** WATER QUALITY LIMITED
1. Dissolved Oxygen E Weekly Weekly 3/week Daily 2. Dissolved Oxygen U,D Weekly Weekly 3/week+ 3/week+ 3. pH E Weekly Weekly 3/week Daily 4. Temperature, °C E Weekly Weekly 3/week Daily 5. Temperature, °C U,D Weekly Weekly 3/week+ 3/week+ 6. BOD, 5-day, 20°C E 2/month Weekly 3/week Daily 7. TSS E 2/month Weekly 3/week Daily 8. Total Phenols E 2/month Weekly 3/week Daily 9. Oil and Grease E 2/month Weekly 3/week Daily 10. Total Nitrogen E * * * * 11. Total Phosphorus E * * * * 12. Toxics and Toxicity ** ** ** ** 13. Conductivity E Weekly Weekly 3/week Daily 14. Conductivity U,D Weekly Weekly 3/week+ 3/week+ 
LEATHER AND LEATHER PRODUCTS
MINIMUM REQUIREMENTS FOR SIC 3100-3199
EFFLUENT LIMITED
REQUIRED TEST LOCATION FREQUENCY CLASS CLASS CLASS CLASS I II III IV 1. pH E Weekly Weekly 3/week Daily 2. Temperature, °C E Weekly Weekly 3/week Daily 3. BOD, 5-day, 20°C E 2/month Weekly 3/week Daily 4. TSS E 2/month Weekly 3/week Daily 5. COD E 2/month Weekly Weekly Daily 6. Ammonia Nitrogen E Monthly Weekly Weekly Weekly 7. Oil and Grease E 2/month Weekly 3/week Daily 8. Turbidity E Weekly 3/week Daily Daily 9. Total Nitrogen E * * * * 10. Total Phosphorus E * * * * 11. Toxics and Toxicity ** ** ** ** WATER QUALITY LIMITED
1. Dissolved Oxygen E Weekly Weekly 3/week Daily 2. Dissolved Oxygen U,D Weekly Weekly 3/week+ 3/week+ 3. pH E Weekly Weekly 3/week Daily 4. Temperature, °C E Weekly Weekly 3/week Daily 5. Temperature, °C U,D Weekly Weekly 3/week+ 3/week+ 6. BOD, 5-day, 20°C E 2/month Weekly 3/week Daily 7. TSS E 2/month Weekly 3/week Daily 8. COD E 2/month Weekly 3/week Daily 9. Ammonia Nitrogen E 2/month Weekly 3/week Daily 10. Oil and Grease E 2/month Weekly 3/week Daily 11. Turbidity E Weekly Weekly 3/week Daily 12. Total Nitrogen E * * * * 13. Total Phosphorus E * * * * 14. Toxics and Toxicity ** ** ** ** 15. Conductivity E Weekly Weekly 3/week Daily 16. Conductivity U,D Weekly Weekly 3/week+ 3/week+ 
FABRICATED METAL PRODUCTS EXCEPT ORDINANCE: MACHINERY AND TRANSPORTATION EQUIPMENT MACHINERYELECTRICAL MACHINERY, EQUIPMENT AND SUPPLIES
MINIMUM REQUIREMENTS FOR SIC 3400-3699
EFFLUENT LIMITED
REQUIRED TEST LOCATION FREQUENCY CLASS CLASS CLASS CLASS I II III IV 1. pH E Weekly Weekly 3/week Daily 2. Temperature, °C E Weekly Weekly 3/week Daily 3. Oil and Grease E 2/month Weekly 3/week Daily 4. Total Nitrogen E * * * * 5. Total Phosphorus E * * * * 6. Toxics and Toxicity ** ** ** ** 7. Dissolved Oxygen E Weekly Weekly 3/week Daily WATER QUALITY LIMITED
1. Dissolved Oxygen E Weekly Weekly 3/week Daily 2. pH E Weekly Weekly 3/week Daily 3. Temperature, °C E Weekly Weekly 3/week Daily 4. Oil and Grease E 2/month Weekly 3/week Daily 5. Total Nitrogen E * * * * 6. Total Phosphorus E * * * * 7. Toxics and Toxicity ** ** ** ** 
ELECTRICAL AND GAS SERVICES
MINIMUM REQUIREMENTS FOR SIC 4900-4939
EFFLUENT LIMITED
REQUIRED TEST LOCATION FREQUENCY CLASS CLASS CLASS CLASS I II III IV 1. pH E Weekly Weekly Weekly Weekly 2. Temperature, °C E Weekly Weekly Weekly Weekly 3. Total Nitrogen E * * * * 4. Total Phosphorus E * * * * 5. Toxics and Toxicity ** ** ** ** WATER QUALITY LIMITED
1. Dissolved Oxygen E Weekly Weekly Weekly Weekly 2. pH E Weekly Weekly Weekly Weekly 3. Temperature, °C E Weekly Weekly Weekly Weekly 4. Total Nitrogen E * * * * 5. Total Phosphorus E * * * * 6. Toxics and Toxicity ** ** ** ** Note: The following monitoring for steam electric generating establishments discharging once through cooling water or cooling tower blowdown shall be required whether or not the discharge is from a classified facility.
REQUIRED TEST LOCATION FREQUENCY CLASS CLASS CLASS CLASS I II III IV 1. Temperature, °C E Cont. Cont. Cont. Cont. 2. Temperature, °C U, D 3/week+ 3/week+ 3/week+ 3/week+ 3. Flow Continuous Continuous Continuous Continuous during during during during discharge discharge discharge discharge 
WATER SUPPLY PLANTS
MINIMUM REQUIREMENTS FOR SIC 4941
EFFLUENT LIMITED
REQUIRED TEST LOCATION FREQUENCY CLASS CLASS CLASS CLASS I II III IV 1. Settleable Solids E Weekly Weekly Weekly Weekly 2. TSS E 2/month 2/month 2/month 2/month 3. Turbidity E Weekly Weekly Weekly Weekly 4. pH E Weekly Weekly Weekly Weekly 5. Chloride E Weekly Weekly Weekly Weekly 
DOMESTIC WASTEWATER AND OTHER FACILITIES DISCHARGING PRIMARILY DOMESTIC
MINIMUM REQUIREMENTS FOR SIC 4952
EFFLUENT LIMITED
REQUIRED TEST LOCATION FREQUENCY CLASS CLASS CLASS CLASS I II III IV 1. pH E 2/month Weekly 3/week Daily 2. Temperature, °C E Weekly Weekly 3/week Daily 3. BOD, 5-day, 20°C I,E 2/month Weekly 3/week Daily 4. TSS I,E 2/month Weekly 3/week Daily 5. Ammonia Nitrogen E Monthly 2/month Weekly 3/week 6. Fecal Coliform E 2/month Weekly 3/week Daily 7. Total Nitrogen E * * * * 8. Total Phosphorus E * * * * 9. Toxics and Toxicity ** ** ** ** WATER QUALITY LIMITED
1. Dissolved Oxygen E Weekly Weekly 3/week Daily 2. Dissolved Oxygen U,D Weekly Weekly 3/week+ 3/week+ 3. pH E 2/month Weekly 3/week Daily 4. Temperature, °C E Daily Daily Daily Daily 5. Temperature, °5 U,D Weekly Weekly 3/week+ 3/week+ 6. BOD, 5-day, 20°C I,E 2/month Weekly 3/week Daily 7. TSS I,E 2/month Weekly 3/week Daily 8. Ammonia Nitrogen E 2/month Weekly 3/week Daily 9. Residual Chlorine E 2/week 2/week 3/week Daily 10. Fecal Coliform E 2/month Weekly 3/week Daily 11. Fecal Coliform U,D 2/month Weekly 3/week+ 3/week+ 12. Conductivity E Weekly Weekly 3/week Daily 13. Conductivity U,D Weekly Weekly 3/week+ 3/week+ 14. Total Nitrogen E * * * * 15. Total Phosphorus E * * * * 16. Toxics and Toxicity ** ** ** ** 
SERVICES
MINIMUM REQUIREMENTS FOR SIC 7000-8999
EFFLUENT LIMITED
REQUIRED TEST LOCATION FREQUENCY CLASS CLASS CLASS CLASS I II III IV 1. pH E Weekly Weekly 3/week Daily 2. Temperature, °C E Weekly Weekly 3/week Daily 3. BOD, 5-day, 20°C E 2/month Weekly 3/week Daily 4. TSS E 2/month Weekly 3/week Daily 5. Ammonia Nitrogen E Monthly 2/month Weekly 3/week 6. Detergents (MBAS) E 2/month Weekly 3/week Daily 7. Fecal Coliform E 2/month Weekly 3/week Daily 8. Total Nitrogen E * * * * 9. Total Phosphorus E Monthly 2/month Weekly 3/week 10. Toxics and Toxicity ** ** ** ** WATER QUALITY LIMITED
1. Dissolved Oxygen E Weekly Weekly 3/week Daily 2. Dissolved Oxygen U,D Weekly Weekly 3/week+ 3/week+ 3. pH E Weekly Weekly 3/week Daily 4. Temperature, °C E Weekly Weekly 3/week Daily 5. Temperature, °C U,D Weekly Weekly 3/week+ 3/week+ 6. BOD, 5-day, 20°C E 2/month Weekly 3/week Daily 7. TSS E 2/month Weekly 3/week Daily 8. Ammonia Nitrogen E Monthly 2/month Weekly 3/week 9. Detergents (MBAS) E 2/month Weekly 3/week Daily 10. Fecal Coliform E 2/month Weekly 3/week Daily 11. Total Nitrogen E * * * * 12. Total Phosphorus E * * * * 13. Toxics and Toxicity ** ** ** ** 14. Conductivity E Weekly Weekly 3/week Daily 15. Conductivity U,D Weekly Weekly 3/week+ 3/week+ + Upstream and Downstream monitoring in water quality limited waters is to be conducted three times per week during June, July, August, and September, and once per week during the rest of the year.
* Total Nitrogen and Phosphorus Monitoring
History Note: Authority G.S. 143‑215.3(a)(1); 143-215.64; 143‑215.65; 143‑215.66;
Eff. February 1, 1976;
Amended Eff. April 1, 1993; December 1, 1984; November 1, 1978;
Readopted Eff. May 1, 2020.