Texas Administrative Code › Title 30 - ENVIRONMENTAL QUALITY › Part 1 - TEXAS COMMISSION ON ENVIRONMENTAL QUALITY › Chapter 334 - UNDERGROUND AND ABOVEGROUND STORAGE TANKS › Subchapter K - STORAGE, TREATMENT, AND REUSE PROCEDURES FOR PETROLEUM-SUBSTANCE CONTAMINATED SOIL › Section 334.502 - Design and Operating Requirements of Stockpiles and Land Surface Treatment Units

Current through Reg. 49, No. 28; July 12, 2024
(a) A stockpile or
				  land surface treatment unit located at any storage or treatment facility or at
				  any leaking petroleum storage tank site shall have an appropriate means of
				  preventing any discharge or release of petroleum-substance waste or
				  petroleum-substance waste constituents into any media. This shall be
				  accomplished with:
(1) a synthetic,
				  impermeable liner that is designed, constructed, and installed to prevent any
				  migration of petroleum-substance wastes out of the stockpile or land surface
				  treatment unit into the adjacent subsurface soil, groundwater, or surface water
				  at any time during the active life (including the closure period) of the
				  stockpile, or land surface treatment unit. The liner shall be constructed of
				  materials that do not allow petroleum-substance waste or petroleum-substance
				  waste constituents to migrate into the liner itself or into the adjacent
				  subsurface soil, groundwater, or surface water during the active life of the
				  facility. The liner shall:
(A) be 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 hydro geologic forces), physical contact with the
				  hydrocarbons or leachate to which they are exposed, climatic conditions, the
				  stress of installation, and the stress of daily operations;
(B) be 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, tearing, or uplift;
(C) be installed to cover all surrounding
				  earth likely to be in contact with the petroleum-substance waste or leachate;
				  and
(D) contain a leachate
				  collection and removal system immediately above the liner that is designed,
				  constructed, maintained, and operated to collect and remove leachate and
				  rainwater from the stockpile or land surface treatment unit. The facility owner
				  and operator shall specify the design and operating conditions which will
				  ensure that the leachate depth over the liner does not exceed the depth of soil
				  on the liner. The leachate collection and removal system shall be constructed
				  of materials that are:
(i) chemically
				  resistant to the hydrocarbons managed in the pile and the leachate expected to
				  be generated; and
(ii) of
				  sufficient strength and thickness to prevent collapse under the pressures
				  exerted by overlaying petroleum-substance wastes, petroleum-substance waste
				  cover materials, and any equipment used at the stockpile or treatment unit;
				  and
(iii) designed and operated to
				  function without clogging through the scheduled life of the stockpile or land
				  surface treatment unit; or