Current through September 18, 2024
Authority: IC 13-14-8-7; IC 13-15; IC 13-19-3
Affected: IC 13-20; IC 36-9-30
Sec. 12.
(a) Erosion
and sedimentation control measures must be instituted to minimize the off-site
migration of any sediment. All run-off from disturbed acreage must pass through
a sedimentation basin or an approved alternative sediment control practice. The
commissioner may require additional erosion and sediment control measures based
on site-specific conditions.
(b) A
storm water or sedimentation basin or series of basins permitted and
constructed under this article must be constructed in accordance with the
following:
(1) Be designed to handle,
simultaneously, the run-off resulting from the ten (10) year, twenty-four (24)
hour precipitation event and the sediment storage volume required by
subdivision (3).
(2) An appropriate
combination of principal and emergency spillways shall be provided to discharge
safely the run-off from a twenty-five (25) year, twenty-four (24) hour
precipitation event with a minimum of two (2) feet of freeboard.
(3) Provide a minimum of three (3) years of
sediment storage volume. The following requirements apply:
(A) Sediment must be removed from
sedimentation basins when the volume of sediment accumulates to fifty percent
(50%) or more of the designed sediment storage volume.
(B) A sediment storage volume of less than
three (3) years may be approved by the commissioner if an annual approved
maintenance program will be performed.
(4) Provide a detention time of at least
twenty-four (24) hours for the ten (10) year, twenty-four (24) hour
precipitation event. A detention time of less than twenty-four (24) hours may
be approved by the commissioner if the following is demonstrated by the owner,
operator, or permittee:
(A) The discharge will
not result in the release of a significant quantity of sediment from the
MSWLF.
(B) Will not violate any
local, state, or federal laws pertaining to discharges.
(5) The principal spillway must be located at
a height above the maximum elevation of the designed sediment storage volume
required by subdivision (3).
(6)
Discharge in compliance with all applicable state and federal laws.
(7) The length-to-width ratio of the flow
path shall be 2:1 or greater from the inflow to the outflow. Baffles may be
used within the basin to achieve this ratio.
(c) If deemed necessary by the commissioner,
additional erosion and sediment control practices may be required in the
drainage areas of permanent basins for the purposes of increasing the life of
the basin and increasing the overall efficiency of removing sediment from
run-off.
(d) Alternatives to the
requirements in subsections (b) through (c) may be approved by the
commissioner. Factors that will be considered include the following:
(1) The amount of water collected from
disturbed areas and undisturbed areas.
(2) Use of erosion control measures on
disturbed areas.
(3) Sedimentation
control measures utilized in the drainageways.
(e) The commissioner may require the
submittal of the following information for any storm water/sedimentation pond
or basin to verify it is designed and constructed properly:
(1) Basin plan view.
(2) Typical cross section.
(3) All the inlet and outlet
elevations.
(4) Assumptions used to
size the basin.
(5) Calculations
used.
(6) Justifications.
(f) A storm water pollution
prevention plan must be prepared in accordance with
329 IAC
10-15-12. The plan must be updated whenever there is a
change at the MSWLF that would significantly affect the storm water discharges
authorized under the MSWLF's permit. The plan must be kept on site and must be
available to the commissioner at the time of an on-site inspection.
(g) A written nonstorm water assessment
including the following shall be kept in the facility record:
(1) A certification statement that storm
water discharges entering waters of the state have been evaluated for presence
of contaminants and nonstorm water contributions. The certification shall
include a description of the method used, the date of any testing, and the
on-site drainage points that were directly observed during the test.
(2) A statement that the facility does not
allow detergent or solvent-based washing of equipment or vehicles that would
allow washwater additives to enter any storm drainage system or receiving
water.
(3) A statement that all
interior maintenance areas floor drains that have the potential for maintenance
fluids or other materials to enter storm sewers are connected to a sanitary
sewer or other appropriate collection system, and that all maintenance fluids
or other materials are properly disposed in accordance with all applicable
local, state, and federal laws.
