Administrative Code

Virginia Administrative Code
11/26/2022

Article 1. Monitoring

9VAC25-790-260. Influent and effluent monitoring.

Article 1
Monitoring

A. Methods. Sampling and testing methods shall conform to permit requirements, or if not specified, to current United States Environmental Protection Agency (EPA) guidelines establishing test procedures for analysis of pollutants or other EPA approved methods.

B. Schedule. The operation and maintenance manual shall contain a specific testing schedule of the minimum tests and their frequencies to be conducted by the facility in accordance with the appropriate certificate and permit issued. If not specifically addressed in the issued certificate and permit, influent and effluent monitoring shall be in accordance with this schedule. Typical tests are listed in 9VAC25-790-960.

C. Sampling. The following sampling instructions shall be followed when collecting samples as required to comply with this chapter and standards contained in this chapter.

1. Raw sewage samples are be collected prior to the treatment process unit operations; samples may be collected following the bar screen or comminutor.

2. Final effluent samples are to be taken at a point following all unit operations in the treatment process. An evaluation of chlorine reduction or dechlorination methods will require monitoring of chlorine residual and fecal coliform levels in treated sewage flows following the chlorine contact tank.

3. Chlorine residual, fecal coliform, pH, temperature and DO test samples may consist of grab samples of sewage flow obtained immediately prior to analytical measurements.

4. Compositing of samples shall be in accordance with the treatment works operation and maintenance manual. Composite samples of sewage flows shall consist of grab samples taken at a minimum frequency of one per hour and should be combined in proportion to flow. Greater frequency of grab sampling may be desirable where abnormal variation in waste strength occurs. Automatic flow proportional samplers are considered a valid sampling method.

Statutory Authority

§ 62.1-44.19 of the Code of Virginia.

Historical Notes

Former 12VAC5-581-320 derived from Virginia Register Volume 18, Issue 10, eff. February 27, 2002; amended and adopted as 9VAC25-790-260, Virginia Register Volume 20, Issue 9, eff. February 12, 2004.

9VAC25-790-270. Operational testing and control.

A. Methods. Sampling and testing methods shall conform to the issued certificate and permit requirements. In addition, current United States Environmental Protection Agency (EPA) guidelines and test procedures for analysis of pollutants may be used, as well as other EPA recommended methods.

B. Schedule. The operation and maintenance manual shall contain a specific schedule of the minimum tests and their frequency to be conducted by the treatment works and sampling instructions. Tests and sampling shall be in accordance with the requirements established by the instructions contained in the treatment works' operation and maintenance manual. Typical tests and sampling instructions are contained in this chapter.

C. Information. If necessary, additional operational control information may be requested on an individual treatment works basis by the department to evaluate performance reliability.

D. Records.

1. The owner shall maintain records on the treatment works operation, maintenance and laboratory testing. The records shall be available for review by department and area engineer during inspections at reasonable times. Any records of monitoring activities and results shall include at least the following for all samples:

a. The date, place, and time of sampling or measurements.

b. Individual that performed the sampling or measurements.

c. The dates analyses were performed.

d. Individual that performed analysis.

e. The analytical techniques or methods used.

f. The results of such analyses.

2. The owner shall maintain for a minimum of three years any records of monitoring activities and results, including all original strip chart recordings for continuous monitoring and instrumentation and all calibration and maintenance records. This period of retention shall be extended during the course of any unresolved litigation regarding the discharge of pollutants by the owner or upon the request of the director.

Statutory Authority

§ 62.1-44.19 of the Code of Virginia.

Historical Notes

Former 12VAC5-581-330 derived from Virginia Register Volume 18, Issue 10, eff. February 27, 2002; amended and adopted as 9VAC25-790-270, Virginia Register Volume 20, Issue 9, eff. February 12, 2004.

9VAC25-790-280. Land based monitoring system.

A. Land application of effluent. The Operation and Maintenance Manual shall contain a schedule of required minimum tests and their frequency to be conducted for the land treatment system and shall also contain instructions for recording and reporting. Monitoring, reporting, and recording for land treatment systems shall be in accordance with the treatment works' Operation and Maintenance Manual. Information concerning monitoring, recording and reporting for land application of effluent are contained in this chapter.

B. Sewage sludge and residual solids management. Either the Operation and Maintenance Manual or the sludge management plan shall contain a list of required minimum tests to be conducted for the sewage sludge and residual solids management system and shall also contain instructions for recording and reporting. Monitoring, reporting, and recording requirements for sewage sludge and residual solids management shall be in accordance with the sludge management plan or operation plan in accordance with this chapter and the Biosolids Use Regulations (12VAC5-585). Suggested monitoring, reporting, and recording for sewage sludge and residual solids management are described in this chapter. The record keeping and reporting requirements for sewage sludge and residual solids management contained in the treatment works Operation and Maintenance Manual or sludge management plan shall apply to all application sites, regardless of size or frequency of application. However, the requirements relative to monitoring, reporting, and recording of site specific soils and the monitoring, reporting, and recording of ground water and surface water are not applicable for any site that meets criteria established in the Biosolids Use Regulations (12VAC5-585) for a monitoring waiver.

Statutory Authority

§ 62.1-44.19 of the Code of Virginia.

Historical Notes

Former 12VAC5-581-340 derived from Virginia Register Volume 18, Issue 10, eff. February 27, 2002; amended and adopted as 9VAC25-790-280, Virginia Register Volume 20, Issue 9, eff. February 12, 2004.

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