MIL-HDBK-1138
a)
Requirements designed to control and reduce
pathogens in solids
b)
Requirements designed to reduce the ability of the
solids to attract vectors (rodents, birds, insects, and other
living organisms that can transport solids pathogens away from
the land application or surface disposal site)
c)
Requirements designed to limit the amount of heavy
metals in solids applied to land or placed on a surface disposal
site
Subpart D of Part 503 includes both performance- and
technology-based requirements that aim to reduce pathogens and
vector attraction. It is designed to provide a more flexible
approach than Part 257, which required solids to be treated by
specific listed or approved treatment technologies. Under
Part 503, treatment works may continue to use the same processes
they used under Part 257, but they now also have the freedom to
modify conditions and combine processes with each other, as long
as the treated solids meet the applicable requirements.
2.4.3.3
Applicability of the Requirements [503.15].
Part 503.15 covers the applicability of the pathogen and vector
attraction reduction requirements. The Subpart D requirements
apply to solids (both bulk solids and solids that are sold or
given away in a bag or other container for application to the
land) and domestic septage applied to the land or placed on a
surface disposal site. The regulated community includes persons
who generate or prepare solids for application to the land, as
well as those who apply it to the land, including anyone who:
a)
Generates solids that are land-applied or placed
on a surface disposal site
b)
Derives a material from solids
c)
Applies solids to the land
d)
Owns or operates a surface disposal site
2.4.3.4
Requirements for Land Application or Disposal.
Solids cannot be applied to land or placed on a surface disposal
site unless they have met the two basic types of requirements in
Subpart D: pathogen and vector attraction reduction
requirements. These two types of requirements are separated in
Part 503 (they were combined in Part 257) which allows
flexibility in how they are achieved. Compliance with the two
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