Texas Administrative Code › Title 30 - ENVIRONMENTAL QUALITY › Part 1 - TEXAS COMMISSION ON ENVIRONMENTAL QUALITY › Chapter 210 - USE OF RECLAIMED WATER › Subchapter B - GENERAL REQUIREMENTS FOR THE PRODUCTION, CONVEYANCE, AND USE OF RECLAIMED WATER › Section 210.23 - Storage Requirements for Reclaimed Water

Current through Reg. 49, No. 28; July 12, 2024
(a) Except for authorized on-channel ponds,
				  storage facilities for retaining reclaimed water prior to use shall not be
				  located within the floodway.
(b)
				  Except as provided by subsection (e) of this section, all initial holding ponds
				  must be lined in accordance with either subsection (c) or (d) of this section,
				  as appropriate.
(c) All initial and
				  subsequent holding ponds containing Type I and Type II effluent, located within
				  the recharge zone of the Edwards Aquifer, as defined in Chapter 213 of this
				  title (relating to Edwards Aquifer), and all initial holding ponds containing
				  Type II effluent, located in a vulnerable area as defined by a rating of 110 or
				  greater on the statewide "Ground-Water Pollution Potential--General, Municipal,
				  and Industrial Sources" (DRASTIC) map (as shown in Figure 1 of this chapter),
				  shall conform to the following requirements:
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(1) The ponds,
				  whether constructed of earthen or other impervious material, shall be designed
				  and constructed so as to prevent groundwater contamination;
(2) Soils used for pond lining shall be free
				  from foreign material such as paper, brush, trees, and large rocks;
(3) All soil liners must be of compacted
				  material, at least 24 inches thick, compacted in lifts no greater than six
				  inches thick and compacted to 95% of Standard Proctor Density. In-situ clay
				  soils meeting the soils liner requirements shall be excavated and re-compacted
				  a minimum of six inches below planned grade to assure a uniformly compacted
				  finished surface.
(4) Soil liners
				  must meet the following particle size gradation and Atterberg limits:
(A) 30% or more passing a number 200 mesh
				  sieve; and
(B) a liquid limit of
				  30% or greater; and a plasticity index of 15 or greater and have a permeability
				  less than or equal to 1 X 10[sup]-7[/sup] cm/sec;
(5) Synthetic membrane linings shall have a
				  minimum thickness of 40 mils with a leak detection system. In situ liners at
				  least 24 inches thick meeting a permeability less than or equal to 1 X
				  10[sup]-7[/sup] cm/sec are acceptable alternatives;
(6) Certification shall be furnished by a
				  Texas Registered Professional Engineer that the pond lining meets the
				  appropriate criteria prior to utilization of the facilities; and
(7) Soil embankment walls shall have a top
				  width of at least five feet. The interior and exterior slopes of soil
				  embankment walls shall be no steeper than one foot vertical to three feet
				  horizontal unless alternate methods of slope stabilization are utilized. All
				  soil embankment walls shall be protected by a vegetative cover or other
				  stabilizing material to prevent erosion. Erosion stops and water seals shall be
				  installed on all piping penetrating the embankments.