Current through Register Vol. 48, No. 38, September 20, 2024
A new CCR surface impoundment must be designed, constructed,
operated and maintained with a leachate collection and removal system. The
leachate collection and removal system must be designed, constructed, operated,
and maintained to collect and remove leachate from the leachate collection
system of the CCR surface impoundment during its active life and post-closure
care period.
a) The leachate
collection and removal system must:
1) Be
placed above the liner required by Section 845.400 or Section
845.410;
2) Have placed above it a
filter layer that has a hydraulic conductivity of at least 1 x
10-5 cm/sec;
3) Have a bottom slope of three percent or
more towards the collection pipes;
4) Be constructed of:
A) Granular drainage materials with a
hydraulic conductivity of 1 x 10-1 cm/sec or more
and a thickness of 24 inches or more above the crown of the collection pipe;
or
B) Synthetic drainage materials
with a transmissivity of 6 x 10-4
m2/sec or more;
5) Be constructed of materials that are
chemically resistant to CCR and any non-CCR waste managed in the CCR surface
impoundment and the leachate expected to be generated, and of sufficient
strength and thickness to prevent collapse under the pressures exerted by
overlying waste and any waste cover materials and equipment used at the CCR
surface impoundment;
6) Be
designed, constructed and operated with collection pipes at the base of the
granular material to prevent clogging with fines during the active life and
post-closure care period;
7) Have
collection pipes:
A) Designed such that
leachate is collected at a sump and is pumped or flows out of the CCR surface
impoundment;
B) With slopes that
allow flow from all points within the CCR surface impoundment to the sump or
drain outlet; and
C) Large enough
to conduct periodic cleaning;
8) Have a protective layer or other means of
deflecting the force of CCR pumped into the CCR surface impoundment;
9) Be designed and operated to minimize
clogging during the active life and post-closure care period; and
10) At a minimum, the leachate collection and
removal system must be operated to remove free liquids from the CCR surface
impoundment at the time of closure and during post closure care.
b) The owner or operator must
obtain certification from a qualified professional engineer that the design of
the leachate collection system complies with the requirements of this Section
and submit this certification to the Agency in the facility's construction
permit application.
c) Upon
completion, the owner or operator must obtain a certification from a qualified
professional engineer that the leachate collection system has been constructed
in accordance with the requirements of this Section and submit this
certification to the Agency in the facility's initial operating permit
application.
