9VAC25-31-660: Frequency of monitoring

A. Sewage sludge (other than domestic septage).

1. The frequency of monitoring for the pollutants in Tables 1 and 2 of 9VAC25-31-630; the pathogen density requirements in 9VAC25-31-710 A and in 9VAC25-31-710 B 2; and the vector attraction reduction requirements in 9VAC25-31-720 B 1 through B 4, B 7 and B 8 for sewage sludge placed on an active sewage sludge unit shall be the frequency in Table 1 of this section.

TABLE 1

FREQUENCY OF MONITORING--SURFACE DISPOSAL

Amount of sewage sludge*

(metric tons per 365-day period)

Frequency

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)

*Amount of sewage sludge placed on an active sewage sludge unit (dry weight basis).

2. After the sewage sludge 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 9VAC25-31-710 A 5 b and c.

B. Domestic septage. If the vector attraction reduction requirements in 9VAC25-31-720 B 12 are met when domestic septage is placed on an active sewage sludge unit, each container of domestic septage shall be monitored for compliance with those requirements.

C. Air. Air in structures within a surface disposal site and at the property line of the surface disposal site shall be monitored continuously for methane gas during the period that the surface disposal site contains an active sewage sludge unit on which the sewage sludge is covered and for three years after a sewage sludge unit closes when a final cover is placed on the sewage sludge.