15A NCAC 02B .0505 MONITORING REQUIREMENTS
(a) General. Every person subject to this Section shall be required to establish, operate and maintain a monitoring program consistent with their National Pollutant Discharge Elimination System (NPDES) Permit or as required by the Director.
(b) Wastewater and Stream Flow Measurement.
(1) A device or method, approved by the Director for determining the rate of flow of all discharges of wastewater whether treated or untreated shall be provided at those point sources of which monthly reports of monitoring tests and measurements are required unless specifically excepted by the Director as not significant. All water pollution control facilities shall install, operate, and maintain continuous flow measuring with recording devices or totalizing devices, if approved by the Director, or shall employ other flow measuring or flow control methods approved by the Director and shall submit monthly reports of such data as required in Rule .0506 of this Section. The permittee shall install appropriate flow measurement devices consistent with approved engineering and scientific practices to ensure the accuracy and reliability of measurements of the volume of monitored discharges. Devices selected shall be capable of measuring flows with a maximum deviation of less than 10 percent from true discharge volumes. Flow measurement devices shall be accurately calibrated at a minimum of once per year and maintained to ensure that the accuracy of the measurements is consistent with the accepted capability of that type of device. The flow measurement device and location shall be approved by the Director prior to installation. Records of flow measurement device calibration shall be kept on file by the permittee for a period of at least three years. At a minimum, data to be included in this documentation shall be:
(A) Date of flow measurement device calibration
(B) Name of person performing calibration.
(2) A reading of the U.S. Geological Survey stream flow staff gauge or reference point shall be made at the time of stream sampling in those instances so determined the Director.
(1) Frequency and Location. Except as otherwise provided herein, all industrial establishments and units of government shall take influent, effluent and stream samples at such locations and with such frequency as shall be necessary to conduct the tests and analyses required by Rule .0508 of this Section.
(2) Establishment of Sampling Points:
(A) Sampling points as required in Rule .0508 of this Section shall be established for collecting influent and effluent samples for each facility.
(B) Sampling points shall be established in the receiving waters at one or more upstream locations and at one or more downstream locations. These locations shall be specified by the Director.
(3) Collection of Samples:
(A) Samples collected in receiving waters shall be grab samples.
(B) Samples of the influent and effluent of the water pollution control facility or other point source shall be composite samples, except as provided in Rule .0505 (c)(3)(C) of this Section, or for facilities with design flows of 30,000 gallons per day or less unless required by the Director. The Director may specify the methods of sample collection as to type of sample and type of composite sampling required.
(C) The following influent and effluent tests shall be made on grab samples and shall not be made on composite samples:
(i) dissolved oxygen,
(iii) settleable matter,
(vi) residual chlorine,
(vii) coliform bacteria (fecal or total),
(ix) oil and grease,
(xii) volatile organics.
(4) Stream sampling may be discontinued at such times as flow conditions in the receiving waters or extreme weather conditions will result in a substantial risk of injury or death to persons collecting samples. In such cases, on each day that sampling is discontinued, written justification for the discontinuance shall be specified in the monitoring report for the month in which the event occurred. This provision shall be strictly construed and may not be utilized to avoid the requirements of this Section when performance of these requirements is attainable. When there is a discontinuance pursuant to this provision, stream sampling shall be resumed at the first opportunity after the risk period has ceased.
(d) Biological and Toxicity Monitoring. Biological and Toxicity monitoring may be required when, in the opinion of the Director, such monitoring is necessary to establish whether the designated best use of the waters as determined by the Environmental Management Commission, is being or may be impaired or when toxic substances are known or suspected to be present in the facility's discharge.
(e) Tests and Analyses.
(1) If a water pollution control facility receives waste influent from two or more sources, every test required by Rule .0508 of this Section for the standard industrial classification number applicable to the sources shall be performed one time, and it shall not be necessary to repeat such tests for each source; however, the tests shall be performed at the intervals specified by Rule .0508 of this Section for the applicable industrial classification requiring the most frequent test interval.
(2) If analyses of samples of any effluent or any receiving water (collected by the state or a public agency) indicate a violation of effluent limitations, or water quality standards or indicate exceedances of stream action levels or that a violation of water quality standards or exceedances of stream action levels may result under any projected conditions including minimum stream flow and temperature extremes, the Director may require the person responsible for the violation or potential violation to monitor the pollutants or parameters at such points and with such frequency as he determines appropriate. If the source of the pollutant is unknown, the Director may require monitoring for specific pollutants from any suspected discharger.
(3) If the wastewaters discharged by any water pollution control facility violate any effluent limitations or water quality standards or exceeds any stream action levels or contribute to the violation of water quality standards or exceedance of stream action levels established by the Environmental Management Commission the facility shall perform and report such additional tests and measurements at such frequencies and for such periods of time as the Director may require.
(4) Approved Methods of Analysis. The methods used in collection, preservation and analysis of samples shall conform to the guidelines of the Environmental Protection Agency codified as 40 CFR Part 136, which is hereby incorporated by reference including any subsequent amendments and editions. Copies may be obtained from the New Orders, Superintendent of Documents, PO Box 371954, Pittsburgh, PA 15250-7954 at a cost of three hundred forty dollars ($340.00) per edition. The single volume containing 40 CFR Part 136 may be obtained at a cost of thirty dollars ($30.00). Other analytical procedures shall conform to those found in either the most recent approved edition of "Standard Methods for the Examination of Water and Wastewater", (published jointly by the American Public Health Association, the American Water Works Association, and the Water Environment Federation), or "Methods for Chemical Analysis of Waters and Wastes", 1983, or subsequent editions or other methods as approved by the Director. Standard Methods for the Examination of Water and Wastewater is hereby incorporated by reference including any subsequent approved amendments and approved editions. Copies may be obtained from the American Water Works Association, 6666 West Quincy Avenue, Denver CO 82535 at a cost of one hundred sixty dollars ($160.00) per edition. Methods for Chemical Analysis of Waters and Wastes is hereby incorporated by reference including any subsequent amendments and editions. Copies may be obtained from the NTIS, 5285 Port Royal Road, Springfield, VA 22161 at a cost of fifty dollars ($50.00) per edition. All material incorporated by reference in this Rule is available for inspection at the Central office of the Division of Environmental Management, 512 North Salisbury Street, Raleigh, North Carolina 27626‑0535. All test procedures must produce detection and reporting levels that are below the permit discharge requirements and all data generated must be reported to the approved detection level or lower reporting level of the procedure. If no approved methods are determined capable of achieving detection and reporting levels below permit discharge requirements, then the approved method with the lowest detection and reporting level must be used. Biological testing shall be performed in accordance with 15A NCAC 2B .0103(b).
(5) Approval of Laboratories. Analytical determinations made pursuant to the monitoring and reporting requirements of this Section shall be made in adequately equipped laboratories staffed by person(s) competent to perform tests. Only monitoring programs which provide for the making of analytical determinations by qualified employees of the owner or by a laboratory certified by the Division under 15A NCAC 2H .0800 or 15A NCAC 2H .1100 will be considered adequate.
(f) Process Control Monitoring Testing: The Director may require, on a case-by-case basis, process control monitoring testing suitable for the size and classification of the facility.
History Note: Authority G.S. 143‑215.64; 143‑215.66; 143‑215.68;
Eff. February 1, 1976;
Amended Eff. April 1, 1993; December 1, 1984; November 1, 1978.