Texas Administrative Code › Title 30 - ENVIRONMENTAL QUALITY › Part 1 - TEXAS COMMISSION ON ENVIRONMENTAL QUALITY › Chapter 312 - SLUDGE USE, DISPOSAL, AND TRANSPORTATION › Subchapter C - SURFACE DISPOSAL › Section 312.62 - General Requirements

Current through Reg. 49, No. 28; July 12, 2024
(a) No person
				  shall place sewage sludge and/or biosolids on an active disposal unit unless
				  the requirements in this subchapter are met.
(b) An active disposal unit shall not be
				  located within 60 meters of a fault that has displacement in Holocene time,
				  located in an unstable area, or located in a wetland, except as provided in a
				  permit issued pursuant to federal Clean Water Act, §402 or §404
				  .
(c) The owner/operator of an
				  active disposal unit shall submit a written "closure and post closure plan" to
				  the executive director, for approval, at least 180 days prior to the date that
				  the active disposal unit closes. The plan shall describe how the unit will be
				  closed and, at a minimum, shall include:
(1) a
				  discussion of how the leachate collection system will be operated and
				  maintained for three years after the disposal unit closes if the disposal unit
				  has a liner and leachate collection system;
(2) a description of the system used to
				  monitor for methane gas in the air in any structures within the surface
				  disposal site and in the air at the property line of the surface disposal site,
				  as required in §
											312.64(j)
				  of this title (relating to Management Practices); and
(3) a discussion of how public access to the
				  surface disposal site will be restricted for a minimum of three years after the
				  last unit in the surface disposal site closes.
(4) The final cover system for monofills
				  shall be composed of no less than two feet of soil. The first 18 inches or more
				  of cover shall be of clayey soil, classification SC or CL as defined in the
				  "Unified Soils Classification System" developed by the United States Army Corps
				  of Engineers, compacted in layers of no more than six inches to minimize the
				  potential for water infiltration. A CH soil may be used; however, this soil may
				  experience excessive cracking and shall therefore be covered by a minimum of 12
				  inches of topsoil to retain moisture. Other types of soil may be used with
				  prior written approval from the executive director. The final six inches of
				  cover shall be of suitable topsoil that can sustain native plant growth and
				  shall be seeded or sodded immediately following the application of the final
				  cover in order to minimize erosion. Side slopes of the final cover for
				  monofills shall not exceed a 25% grade (four feet horizontal to one foot
				  vertical). Side slopes for the final cover in excess of 25% may be authorized
				  by the executive director provided that controlled drainage such as flumes,
				  diversion terraces, spillways, or other acceptable methods are incorporated
				  into the final cover system design submitted to the executive director for
				  review and approval. The final cover for the topmost portion of a disposal unit
				  shall have a gradient of not less than 2.0% and not greater than 6.0% and shall
				  possess a sufficient minimum grade to preclude ponding of surface water when
				  total fill height and expected subsidence are taken into
				  consideration.