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Virginia Administrative Code
Title 9. Environment
Agency 25. State Water Control Board
Chapter 32. Virginia Pollution Abatement (VPA) Permit Regulation
12/26/2024

9VAC25-32-358. Frequency of monitoring.

A. Biosolids.

1. The frequency of monitoring for the pollutants listed in Tables 1 through 5 of 9VAC25-32-356; the pathogen density requirements in 9VAC25-32-675 A and B 2 through B 4; and the vector attraction reduction requirements in 9VAC25-32-685 B 1 through B 4, B 7, and B 8 shall be the frequency in Table 1 of this section.

TABLE 1
FREQUENCY OF MONITORING – LAND APPLICATION

Amount of biosolids(1)

(metric tons per 365-day period)

Frequency(2)

Greater than zero but less than 290

Once per year

Equal to or greater than 290 but less than 1,500

Once per quarter (four times per year)

Equal to or greater than 1,500 but less than 15,000

Once per 60 days (six times per year)

Equal to or greater than 15,000

Once per month (12 times per year

Note(1): Either the amount of bulk biosolids applied to the land or the amount of biosolids received by a person who prepares biosolids that is sold or given away in a bag or other container for application to the land (dry weight basis).

Note(2): Sampling shall be conducted at approximately equal intervals at the listed frequencies. Biosolids programs that store biosolids and land apply only during discrete events throughout the year shall schedule sampling events to coincide with application periods. The department may require increased monitoring frequencies, if necessary, to adequately define any significant variability in biosolids quality.

2. After the biosolids has been monitored for two years at the frequency in Table 1 of this section, the department may reduce the frequency of monitoring for pollutant concentrations and for the pathogen density requirements in 9VAC25-32-675 A 5 b and c.

B. Domestic septage. If the vector attraction reduction requirements in 9VAC25-32-685 B 12 are met when domestic septage is applied to agricultural land, forest, or a reclamation site, each container of domestic septage applied to the land shall be monitored for compliance with those requirements.

Statutory Authority

§ 62.1-44.15 of the Code of Virginia.

Historical Notes

Derived from Virginia Register Volume 29, Issue 24, eff. September 1, 2013; amended, Virginia Register Volume 39, Issue 5, eff. November 23, 2022.

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