Oklahoma Administrative Code
Title 252 - Department of Environmental Quality
Chapter 656 - Water Pollution Control Facility Construction Standards
Subchapter 9 - General Standards
Section 252:656-9-1 - Plant location and design life

(a) Minimum separation distances. Local ordinances and zoning requirements may establish separation distances greater than those required by this Chapter. The minimum separation distance from any public water supply well is 300 feet. The minimum distance requirements from any public water supply intake structure will be determined on a case by case basis. No part of any wastewater treatment or conveyance unit shall be constructed or extended within 100 feet of a plant site property line. Measurement for lagoons shall be from the centerline of the nearest dike.

(b) Flood protection. Protect the treatment works structures, electrical and mechanical equipment from physical damage by a 100-year flood. Treatment works must remain operational and be accessible during a 25-year flood. Flood protection applies to new construction and to existing facilities undergoing major modification.

(c) Design life. Design sewage treatment plants for an estimated 20-year population projection. Construction may occur in phases to reduce initial cost.

(d) Phased. For facilities to be built in phases, the engineer shall furnish design data for ultimate plant capacity. The data shall include size, type, loading and location of all units. Use dashed lines to show units that are to be constructed as a later phase. Furnish a hydraulic profile showing the water elevations of all units and the flood elevation of streams that can affect the plant site. Detailed design data are required for all units to be constructed as Phase I.

(e) Access Restriction. All facilities must be fenced to prevent unauthorized entry. Fencing must be posted with warning signs to indicate the nature of the facility, listing emergency contact information. Post at least one sign on each side of the site.