Current through Register Vol. 24-06, March 15, 2024
(1) These rules
apply to all treatment works treating domestic sewage as defined by this
chapter. In addition, these rules apply to, but are not limited to, the
following:
(a) A person who prepares
biosolids or sewage sludge.
(b) A
person who stores biosolids or sewage sludge.
(c) A person who applies biosolids to the
land.
(d) Biosolids that are
applied to the land.
(e) The land
where biosolids are applied.
(f)
The owner and lease-holder of land where biosolids are applied.
(g) A person who disposes of sewage sludge in
a municipal solid waste landfill.
(h) Sewage sludge that is disposed of in a
municipal solid waste landfill.
(i)
Biosolids or sewage sludge generated at an industrial facility during the
treatment of only domestic sewage.
(j) A person who transfers biosolids or
sewage sludge from one facility to another.
(k) A person who transports biosolids or
sewage sludge.
(l) Mixtures of
biosolids and other materials including, but not limited to, solid
wastes.
(2) This chapter
does not apply to the following sewage sludge and biosolids management
facilities and practices:
(a) The firing of
biosolids or sewage sludge in an incinerator.
(b) The placing or disposal of sewage sludge
in facilities other than municipal solid waste landfills (e.g., the placement
of sewage sludge at a surface disposal site).
(3) Except as provided in (g) of this
subsection, the following solid wastes are not regulated under this chapter:
(a) Sludge generated at an industrial
facility during the treatment of industrial wastewater, including when such a
facility combines their industrial wastewater with their domestic
sewage.
(b) Sewage sludge
determined to be hazardous in accordance with
chapter
70.105 RCW or rules
adopted thereunder.
(c) Sewage
sludge with a concentration of polychlorinated biphenyls (PCBs) equal to or
greater than 50 milligrams per kilogram of total solids (dry weight
basis).
(d) Ash generated during
the firing of sewage sludge or biosolids in an incinerator.
(e) Grit or screenings generated during
preliminary treatment of domestic sewage in a treatment works.
(f) Sludge generated during the treatment of
either surface water or groundwater used for drinking water.
(g) Commercial or industrial septage or a
mixture of domestic septage and commercial or industrial septage except as
allowed in accordance with this subsection.
(i) Grease trap wastes from restaurants and
similar food service facilities may be mixed with domestic septage up to
twenty-five percent by volume.
(ii)
On a case-by-case basis, on request of a septage management facility or at the
department's discretion, the department may designate other commercial or
industrial septage as septage that is "domestic in quality" and require the
septage to be managed in accordance with the provisions of this
chapter.
(iii) At no time may the
combined total of grease trap wastes and other commercial or industrial septage
mixed with domestic septage exceed twenty-five percent by volume.
Statutory Authority: Chapters 70.95J and
70.95 RCW. 07-12-010 (Order 06-06),
§ 173-308-020, filed 5/24/07, effective 6/24/07. Statutory Authority:
RCW
70.95J.020 and
70.95.255. 98-05-101 (Order
97-30), § 173-308-020, filed 2/18/98, effective
3/21/98.
