Current through Reg. 50, No. 13; March 28, 2025
(a) A pit permitted under this division shall
be designed, built, and maintained as follows.
(1) The pit shall contain the material placed
in the pit and prevent releases, overflow, or failure.
(2) The maximum depth from the natural
surface elevation shall not exceed 22 feet.
(3) The foundation and interior slopes shall
consist of a firm, unyielding base, smooth and free of rocks, debris, sharp
edges, or irregularities to prevent the liner's rupture or tear. All interior
and exterior surfaces of the pit shall be smooth drum rolled.
(4) The pit sides and berms shall have
interior and exterior grades no steeper than three horizontal feet to one
vertical foot (3H:1V). The top of the berm shall be wide enough to provide
adequate room for inspection, maintenance, and any other structural or
construction requirements.
(A) Fill for berms
shall be placed and compacted in continuous lifts with a maximum loose lift
thickness of 10 inches, compacted to eight inches.
(B) Berm fill shall be compacted to at least
95% of maximum dry density determined by the Standard Proctor (ASTM D698) and
at moisture content within +2% to -2% of optimum moisture content as determined
by a standard proctor soil test on samples from the source area. One nuclear
density test shall be conducted for each 2,500 cubic yards, and the applicant
shall provide compaction testing results upon completion.
(5) Both primary and secondary liners in a
pit shall be geomembrane liners composed of ASTM GRI-13 compliant materials and
be impervious, synthetic material that is resistant to ultraviolet light,
petroleum hydrocarbons, salts, and acidic and alkaline solutions. Each pit
shall incorporate, at a minimum, a liner system as follows:
(A) The primary liner shall be constructed
with a minimum 60-mil high density polyethylene (HDPE) for any pit under this
subsection permitted after July 1, 2025.
(B) A leak detection system shall be placed
between the primary and secondary geomembrane liners that shall consist of
200-mil biplanar geonet or geo-composite equivalent. The leak detection system
shall consist of a properly designed drainage and collection and removal system
placed above the secondary geomembrane liner in depressions and sloped to
facilitate the earliest possible leak detection. The leak detection system
shall be designed with the capability of removing a minimum of 1,000 gallons of
leachate per acre per day or an alternative action leakage rate shall be
calculated.
(C) The secondary liner
shall be constructed with a minimum 40-mil HDPE for any pit under this
subsection permitted after July 1, 2025. If the depth to groundwater is less
than 100 feet below the ground surface, the secondary liner shall include a
geosynthetic clay liner.
(D) A
geotextile (felt) liner shall be placed under the secondary liner and in
contact with the prepared ground surface.
(6) The edges of all liners shall be anchored
in the bottom of a compacted earth-filled trench that is at least 24 inches
deep and shall be performed in accordance with the manufacturer's instructions.
(7) Field seams in geosynthetic
material shall be performed in accordance with the manufacturer's instructions
and include the following considerations:
(A)
Field seams in geosynthetic material shall be minimized and oriented
perpendicular to the slope of the berm, not parallel.
(B) Prior to field seaming, the operator
shall overlap liners a minimum of four to six inches. The operator shall
minimize the number of field seams and corners and irregularly shaped areas.
There shall be no horizontal seams within five feet of the slope's toe.
(C) Qualified personnel shall
perform field seam welding and testing. Documented quality assurance/quality
control testing reports shall be maintained for the life of the
liner.
(8) At a point of
discharge into or suction from the pit, the operator shall ensure that the
liner is protected from excessive hydrostatic force or mechanical damage.
(9) All piping and equipment that
is in contact with the liner shall be secured to prevent liner wear and damage.
(10) There shall be no
penetrations of the liner system.
(11) The pit shall be designed to prevent
run-on of any non-contact stormwater, precipitation, or surface water. The pit
shall be surrounded by a berm, ditch, or other diversion to prevent run-on of
any non-contact stormwater, precipitation, or surface water.
(12) The pit shall be designed to operate
with a minimum two feet of freeboard plus the capacity to contain the volume of
precipitation from a 25-year, 24-hour rainfall event.
(b) Tanks and treatment equipment shall be
located within a secondary containment system.
(c) A permit application for a stationary
commercial fluid recycling facility shall include the layout and design of the
facility by including a plat drawn to scale with north arrow to top of the map
showing the location and information on the design and size of all receiving,
processing, and storage areas and all equipment, tanks, silos, monitor wells,
dikes, fences, and access roads.
(d) A permit application for a commercial
fluid recycling facility also shall include:
(1) a description of the type and thickness
of liners (e.g., fiberglass, steel concrete), if any, for all tanks, silos,
pits, and storage areas/cells;
(2)
for storage areas where tanks and/or liners are not used, credible engineering
and/or geologic information demonstrating that tanks or liners are not
necessary for the protection of surface and subsurface water;
(3) a map view and two perpendicular
cross-sectional views of pits and/or storage areas/cells to be constructed,
showing the bottom, sides, and berms, showing the dimensions of each;
(4) a plan to control and manage stormwater
runoff and to retain incoming wastes during wet weather, including the location
and dimensions of dikes and/or storage basins that would collect, at a minimum,
stormwater from the facility during a 25-year, 24-hour rainfall event, and all
calculations made to determine the required capacity and design; and
(5) a plan for the installation of monitoring
wells at the facility.