treated solids. Three options cover methods for injection or
incorporating solids into the soil to reduce vector attraction.
One option is a requirement to demonstrate reduced
vector attraction in domestic septage through elevated pH. This
option applies only to domestic septage.
Frequency of Monitoring
Sewage Sludge [503.16(a) and 503.26(a)]. The
Class A and Class B pathogen requirements and the first eight
vector attraction reduction options (the treatment-related
methods) all involve some form of monitoring. The minimum
frequency of monitoring for these requirements is given in Part
503.16(a) for land application and Part 503.26(a) for surface
disposal. The frequency depends on the amount of solids used or
disposed of annually. The larger the amount used or disposed of,
the more frequently monitoring is required.
Domestic Septage [503.16(b) and 503.26(b)]. One
of the options that can be used for demonstrating both pathogen
reduction and vector attraction reduction in domestic septage is
to elevate pH to >12 for 30 minutes. When this option is used,
each container of domestic septage (e.g., each tank truck load)
applied to the land or placed on a surface disposal site must be
monitored for pH.
application and Part 503.27 for surface disposal. Records are
required for both sewage sludge and domestic septage. All
records must be retained for 5 years except when the cumulative
pollutant loading rates in Part 503 Subpart B (Land Application)
are used. In that case, certain records must be kept
indefinitely. Some records must be reported to the permitting
Land Application. Records must be kept to ensure
that the solids meet the applicable pollutant limits, management
practices, one of the pathogen requirements, one of the vector
attraction reduction requirements and, where applicable, the site
restrictions associated with land application of Class B
biosolids. When bulk solids are applied to land, both the person
preparing the solids for land application and the person applying
them must keep records. The person applying solids that are sold
or given away does not have to keep records.