Current through Register Vol. 48, No. 38, September 20, 2024
a) The
owner or operator of any livestock waste lagoon subject to
this Subpart must construct or modify the lagoon in
accordance with:
1)
"Design
of anaerobic lagoons for animal waste management", ASAE Engineering
Practice 403.2; or the guidelines
published by the United States Department of Agriculture's Natural Resource
Conservation Service titled "Waste Treatment Lagoon", which are
incorporated by reference in Section
506.104; and
2) The additional design standards specified
in subsections (c) through (h). [510 ILCS
77/15(a)]
b)
The department may require changes
in design or additional requirements to protect groundwater, such as extra
liner depth or synthetic liners, when it appears groundwater could be
impacted. [510 ILCS
77/15(a)]
c) The owner or operator must conduct a site
investigation in compliance with Section
506.202 to determine if aquifer
material is present (or not present) within 50 feet of the planned bottom of
the lagoon.
d) The owner or
operator must, as a part of the lagoon design, include the use of a liner and
implement groundwater monitoring according to the following conditions:
1) If the uppermost aquifer material is
located above or within 20 feet of the lowest point of the planned lagoon
bottom (as measured from the top of any proposed liner), then the lagoon design
must include both a liner and groundwater monitoring.
2) If the uppermost aquifer material is
located between 20 to 50 feet from the lowest point of the planned lagoon (as
measured from the top of any proposed liner), then the lagoon design must
include a liner, but no groundwater monitoring is required.
3) If no aquifer material is located within
50 feet from the lowest point of the planned lagoon (as measured from the top
of any proposed liner), then the lagoon design does not require a liner or
groundwater monitoring.
e) If the owner or operator determines that a
liner is required for the lagoon under this Section, the design of the lagoon
must include an in-situ soil liner, borrowed clay or clay/bentonite mixture, or
a synthetic liner in compliance with Section
506.205.
f) If the owner or operator determines that
groundwater monitoring is required for the lagoon under this Section, the
design of the lagoon must implement a groundwater monitoring program in
compliance with Section
506.206 and 8 Ill. Adm. Code
900.Subpart F.
g) Any livestock
waste lagoon subject to this Part must meet or exceed the following:
1) Berm:
A)
The minimum berm-top width must be 8 feet;
B) The berm may contain no outlet piping that
extends through the berm unless the piping discharges to another lagoon or is a
component of a recirculating flush system;
2) Berm slope:
A) Exterior and normally exposed interior
(above the liquid level elevation corresponding to the summation of the sludge
volumes and minimum design volume) earthen walls must have side slopes not
steeper than a 3 to 1 ratio of horizontal to vertical and a vegetative cover
must be established on any exposed berm areas and kept mowed or otherwise
maintained to eliminate erosion or other berm deterioration;
B) Interior berm earthen walls below the
liquid level elevation corresponding to the summation of the sludge volumes and
minimum design volume must have side slopes not steeper than a 3 to 1 ratio of
horizontal to vertical or, if designed by a Licensed Professional Engineer and
maintained to eliminate berm deterioration, a 2 to 1 ratio of horizontal to
vertical;
3) The
lagoon's total design volume must be at least the volume calculated as the
summation of the following:
A) A minimum
design volume, as calculated under subsection
5.4.1.1, ASAE
EP403.2, ASAE Standards 1998, pp. 656-659;
B) A livestock waste volume, that must be
sufficient to store the waste generated by the facility for at least 270 days
as determined in ASAE EP403.2, ASAE Standards 1998, p. 656;
C) Runoff and washdown volumes generated
during a 270-day period, including all runoff and precipitation from lots,
roofs, or other surfaces where collected precipitation is directed into the
lagoon, plus the volume of any washdown liquids used within the facility that
are also directed into the lagoon. In no case must this volume be less than the
precipitation and runoff generated by a 25-year, 24-hour storm event and
directed to the lagoon; and
D) A
sludge accumulation volume, as calculated under subsection 5.4.1.4, ASAE EP403.2, ASAE
Standards 1998, p. 658;
4) In addition to the lagoon's total design
volume, a freeboard must be provided as follows:
A) For lagoons serving a livestock management
facility with a maximum design capacity of less than 300 animal units and not
collecting runoff from areas other than the exposed surface of the lagoon
(including associated interior berm slopes and flat berm-top areas), the top of
the settled embankment must be at least 1 foot above the fluid surface level of
the lagoon total design volume; or
B) For all other lagoons, the top of the
settled embankment must be at least 2 feet above the fluid surface level of the
lagoon total design volume;
5) Subsurface drainage lines in the immediate
area of the livestock waste lagoon must be removed or relocated to provide for
a minimum separation distance of at least 50 feet between the outermost extent
of the lagoon (exterior toe of the berm) and the subsurface drainage
line;
6) The minimum separation
distance between the outermost extent of a lagoon (exterior toe of the berm)
and any potential route of groundwater contamination, as defined in the
Illinois Environmental Protection Act [415 ILCS 5 ]
must be at least 100 feet. In addition, the minimum separation distance between
the outermost extent of a lagoon (exterior toe of the berm) and a non-potable
well, an abandoned or plugged well, a drainage well, or an injection well must
be at least 100 feet;
7) The design
and construction of the lagoon must include the installation of a lagoon liquid
level board or staff gauge within the interior of the liquid storage volume.
The liquid level board or staff gauge must include a mark at the liquid level
elevation corresponding to the summation of the sludge volume and minimum
design volume and must be designated as the "STOP PUMPING" elevation. The
liquid level board or staff gauge must also be marked at the liquid level
elevation corresponding to the summation of the sludge volume, minimum design
volume, runoff and washdown volumes, and livestock waste volume and must be
designated as the "START PUMPING" elevation;
8)
The livestock waste supply to a
single-stage lagoon must be below the minimum design volume level
[510 ILCS
77/25(b)(2)] ; and
9) The location of the lagoon and the
associated livestock management facility must comply with all setback
provisions of the Illinois Environmental Protection Act [415 ILCS
5 ], the Livestock Management Facilities Act
[510 ILCS
77 ], and the rules promulgated thereunder.
h)
The owner or operator
of the earthen livestock lagoon may, upon written request and with
written approval from the Department, modify or exceed these standards
in order to meet site specific objectives. [510 ILCS
77/15(a)] The owner or operator must
demonstrate that such modification is at least as protective of the
groundwater, the surface water, and the structural integrity of the livestock
waste management facility as the requirements of this Part.
