Oklahoma Administrative Code
Title 252 - Department of Environmental Quality
Chapter 626 - Public Water Supply Construction Standards
Subchapter 17 - Finished Water Storage
Section 252:626-17-1 - General
Current through Vol. 41, No. 13, March 15, 2024
(a) Construct tanks of reinforced concrete or steel in accordance with AWWA standard specifications. Adequately protect steel tanks against corrosion.
(b) Provide all tanks with a bypass.
(c) Provide safety equipment in accordance with OSHA standards.
(d) Maintain sufficient storage capacity to meet domestic demands and fire flow demands, where fire protection is provided.
(e) Location of standpipes and finished water storage.
(f) Protection.
(g) Drains. Connection through a 6 inch air gap or two pipe diameters of the drain whichever is greater is allowed.
(h) Overflow. Provide all water storage structures with an overflow that terminates at an elevation between 12 and 24 inches above the ground surface, and release water over a drainage inlet structure or splash plate.
(i) Access. Design finished water storage structures with convenient access to the interior for cleaning and maintenance. Manholes located on top of storage structures must:
(j) Vents. Vent all finished water storage structures. Overflows are not considered vents. Open construction between the side wall and roof is not allowed. Design of vents must:
(k) Roof and side wall. Make the roof and side walls of all structures watertight with no openings except properly constructed vents, manholes, overflows, risers, drains, pump mountings, control ports, and piping for inflow and outflow.
(l) Drainage of roof. The roof of the storage structure must be well drained and designed not to hold water or snow. Do not allow downspout pipes to enter or pass through the reservoir.
(m) Freezing. Design finished water storage structures and their appurtenances to prevent freezing.
(n) Internal catwalk. Every catwalk over finished water in a storage structure must have a solid floor with raised edges so shoe scrapings and dirt will not fall into the water.
(o) Outlet piping. Locate the outlet pipes from all storage structures in a manner that will prevent the flow of sediment into the distribution system.
(p) Grading. Grade the area surrounding a ground level structure to prevent surface water from standing within 50 feet of the structure.
(q) Painting and cathodic protection. Provide proper protection to metal surfaces by paints or other protective coatings. Paint systems must be listed by NSF or UL as meeting the ANSI/NSF Standards for contact with potable water. Cathodic protective devices are required where soil conditions warrant.
(r) Disinfection. Disinfect finished water storage structures in accordance with AWWA standard specifications.
Added at 18 Ok Reg 1612, eff 6-1-01; Amended at 25 Ok Reg 2304, eff 7-11-08