Current through all regulations passed and filed through December 16, 2024
(A) Drip pads
must:
(1) Be constructed of non-earthen materials,
excluding wood and non-structurally supported asphalt;
(2) Be sloped to free-drain treated wood
drippage, rain and other waters, or solutions of drippage and water or other
wastes to the associated collection system;
(3) Have a curb or berm around the perimeter;
(4)
(a) Have a hydraulic conductivity of less
than or equal to 1 x 10-7 centimeters per second,
e.g., existing concrete pads must be sealed, coated, or covered with a surface
material with a hydraulic conductivity of less than or equal to 1 x
10-7 centimeters per second such that the entire
surface where drippage occurs or may run across is capable of containing such
drippage and mixtures of drippage and precipitation, materials, or other wastes
while being routed to an associated collection system. This surface material
must be
maintained free of cracks and gaps that could adversely affect its hydraulic
conductivity, and the material must be chemically compatible with the preservatives
that contact the drip pad. The requirements of this provision apply only to
existing drip pads and those drip pads for which the owner or operator elects
to comply with paragraph(B) of rule
3745-69-42 of the Administrative
Code instead of paragraph(A)of rule
3745-69-42 of the Administrative
Code.
(b) The owner or operator
must
obtain and keep on file at the facility a written assessment of the drip pad,
reviewed and certified by qualified
professional engineer that
attests to the results of the evaluation. The assessment
must be
reviewed, updated, and recertified annually. The evaluation
must
document the extent to which the drip pad meets the design and operating
standards of this rule, except for paragraph (B) of this rule.
(5) Be of sufficient structural
strength and thickness to prevent failure due to physical contact, climatic
conditions, the stress of installation, and the stress of daily operations,
e.g., variable and moving loads such as vehicle traffic, movement of wood, etc.
[Comment: Ohio EPA will generally consider applicable
standards established by professional organizations generally recognized by
industry such as the American concrete institute (ACI) and the American society
of testing materials (ASTM) in judging the structural integrity requirement of
paragraph (A)(5) of this rule.]
(B) If an owner/operator elects to comply
with paragraph(A)of rule
3745-69-42 of the Administrative
Code instead of paragraph(B)of rule
3745-69-42 of the Administrative
Code, the drip padmust have:
(1) A
synthetic liner installed below the drip pad that is designed, constructed, and
installed to prevent leakage from the drip pad into the adjacent subsurface
soil or ground water or surface water at any time during the active life
(including the closure period) of the drip pad. the liner
must be
constructed of materials that will prevent waste from being absorbed into the
liner and prevent releases into the adjacent subsurface soil or ground water or
surface water during the active life of the facility. The liner
must be:
(a) Constructed of materials that have
appropriate chemical properties and sufficient strength and thickness to
prevent failure due to pressure gradients (including static head and external
hydrogeologic forces), physical contact with the waste or drip pad leakage to
which they are exposed, climatic conditions, the stress of installation, and
the stress of daily operation (including stresses from vehicular traffic on the
drip pad);
(b) Placed upon a
foundation or base capable of providing support to the liner and resistance to
pressure gradients above and below the liner to prevent failure of the liner
due to settlement, compression,or uplift;
and
(c) Installed to cover all
surrounding earth that could come in contact with the waste or leakage;
and
(2) A leakage
detection system immediately above the liner that is designed, constructed,
maintained, and operated to detect leakage from
the drip pad. The leakage detection system must be:
(a) Constructed of materials that are:
(i) Chemically resistant to the waste managed
in the drip pad and the leakage that might be generated; and
(ii) Of sufficient strength and thickness to
prevent collapse under the pressures exerted by overlaying materials and by any
equipment used at the drip pad; and
(b) Designed and operated to function without
clogging through the scheduled closure of the drip pad.
(c) Designed so that it will detect the
failure of the drip pad or the presence of a release of hazardous waste or
accumulated liquid at the earliest practicable time.
(3) A leakage collection system immediately
above the liner that is designed, constructed, maintained, and operated to collect leakage from the drip pad
such that it can be removed from below the drip pad. The date, time, and
quantity of any leakage collected in this system and removed
must be
documented in the operating log.
(C) Drip pads must be
maintained such that they remain free of cracks, gaps, corrosion, or other
deterioration that could hazardous waste to be released from the drip pad.
[Comment: See paragraph (M) of this rule for remedial
action required if deterioration or leakage is detected.]
(D) The drip pad and associated collection
system must be designed and operated to convey, drain, and
collect liquid resulting from drippage or precipitation in order to prevent
run-off
(E) Unless protected by a
structure, as described in paragraph (B) of rule
3745-69-40 of the Administrative
Code, the owner or operatormust design, construct, operate, and maintain a run-on control system capable of
preventing flow onto the drip pad during peak discharge from at least a
twenty-four-hour, twenty-five-year storm unless the system has sufficient
excess capacity to contain any run-on that might enter the system, or the drip
pad is protected by a structure or cover, as described in paragraph (B) of rule
3745-69-40 of the Administrative
Code.
(F) Unless protected by a
structure or cover, as described in paragraph (B) of rule
3745-69-40 of the Administrative
Code, the owner or operatormust design, construct, operate, and maintain a run-off management system to collect
and control at least the water volume resulting from a twenty-four-hour,
twenty-five-year storm.
(G) The
drip pad must be evaluated to determine that it meets the
requirements of paragraphs (A) to (F) of this rule and the owner or operator
must
obtain a written statement from
a qualified
professional engineer certifying
that the drip pad design meets the requirements of this rule.
(H) Drippage and accumulated precipitation
must be
removed from the associated collection system as necessary to prevent overflow
onto the drip pad.
(I) The drip pad
surface must be cleaned thoroughly in a manner and frequency
such that accumulated residues of hazardous waste or other materials are
removed, with residues being properly managed as hazardous waste, so as to
allow weekly inspections of the entire drip pad surface without interference or
hindrance from accumulated residues of hazardous waste or other materials on
the drip pad. The owner or operator must document
the date and time of each cleaning and the cleaning procedure used in the
facility's operating log.
(J) Drip
pads must be operated and maintained in a manner to
minimize tracking of hazardous waste or hazardous waste constituents off the
drip pad as a result of activities by personnel or equipment.
(K) After being removed from the treatment
vessel, treated wood from pressure and non-pressure processes
must be
held on the drip pad until drippage has ceased. The owner or operator
must
maintain records sufficient to document that all treated wood is held on the
pad following treatment in accordance with this requirement.
(L) Collection and holding units associated
with run-on and run-off control systems must be emptied
or otherwise managed as soon as possible after storms to maintain design
capacity of the system.
(M)
Throughout the active life of the drip pad, if the owner or operator detects a
condition that may have caused or has caused a release of hazardous waste, the
condition must be repaired within a reasonably prompt period of
time following discovery, in accordance with the following procedures:
(1) Upon detection of a condition that may
have caused or has caused a release of hazardous waste (e.g., upon detection of
leakage by the leak detection system), the owner or operator
must:
(a) Enter a record of the discovery in the
facility operating log;
(b)
Immediately remove the portion of the drip pad affected by the condition from
service;
(c) Determine what steps
must be
taken to repair the drip pad, remove any leakage from below the drip pad, and
establish a schedule for accomplishing the clean up and repairs;
(d) Within twenty-four hours after discovery
of the condition, notify the director of the condition and, within ten working
days, provide a written notice to the director with a description of the steps
that will be taken to repair the drip pad, and clean up any leakage, and the
schedule for accomplishing this work.
(2) The director will review the information
submitted, make a determination regarding whether the pad
must be
removed from service completely or partially until repairs and clean up are
complete, and notify the owner or operator of the determination and the
underlying rationale in writing.
(3) Upon completing all repairs and clean up,
the owner or operator must notify the
director in writing and provide a certification, signed by an independent
qualified professional
engineer, that the repairs and clean up have been completed according to the
written plan submitted in accordance with paragraph (M)(1)(d) of this rule.
(N) The owner or
operator must maintain, as part of the facility operating log,
documentation of past operating and waste handling practices. This
must
include identification of preservative formulations used in the past, a
description of drippage management practices, and a description of treated wood
storage and handling practices.