Okla. Admin. Code § 252:656-1-2
In addition to terms defined in Title 27A of the Oklahoma Statutes, the following words or terms, when used in this Chapter, shall have the following meaning unless the context clearly indicates otherwise:
"25-year flood" means a flood event that has a 4 percent chance of being equaled or exceeded in magnitude in any given year.
"100-year flood" means a flood event that has a 1 percent chance of being equaled or exceeded in magnitude in any given year.
"208 Plan" means an area wide wastewater treatment management plan that states are required to submit to EPA for approval pursuant to section 208 of the Clean Water Act, 33 U.S.C. § 1288.
"ASTM" means the American Standard Testing Method and Material.
"Biosolids" means organically treated wastewater materials from municipal wastewater treatment plants that are suitable for recycling as a soil amendment. This term is within the meaning of "sludge" as defined in 27A O.S. § 2-6-101(11). Biosolids are divided into the following classes:
"BOD" means total 5-day biochemical oxygen demand.
"Bypass" means the intentional or unintentional diversion of a waste stream from any portion of a wastewater treatment system.
"CBOD" means 5-day carbonaceous biochemical oxygen demand.
"Cell" means an individual basin of a lagoon system.
"cfm" means cubic feet per minute.
"Collection system" means pipelines or conduits, pumping stations, force mains and all other facilities used to collect or conduct wastewater to a treatment works.
"CT" means the product of residual disinfectant concentration, (C) in (mg/l), and the corresponding disinfectant contact time (T) in minutes, i.e., C x T. CT requirements for a variety of disinfectants and conditions are in the EPA Guidance Manual to the Surface Water Treatment Rule.
"DEQ" means the Oklahoma Department of Environmental Quality.
"Design-build" means a project delivery method in which one entity works under a single contract with the project owner to provide design and construction services.
"Design package" means a submittal to DEQ for an approvable design-build flexible construction permitting process. The number and scope of design packages is defined and set in the approved engineering report with the last design package encompassing the final and completed 100% project design.
"Discharge point" means the point at which wastewater enters Waters of the State or become Waters of the State.
"Domestic wastewater" means wastewater from drinking fountains, showers, toilets, lavatories and kitchens.
"End-of-pipe" means the terminal points in all reclaimed water users' distribution systems.
"Engineer" means a person licensed to practice engineering in Oklahoma.
"Flexible permitting process" means construction permitting for a design-build project that is approved to start construction with multiple design packages, noting that an approved DEQ construction permit is required before construction or modification of a wastewater collection system or treatment works begins. Construction is limited to the scope of the approved design package(s).
"fps" means feet per second.
"Freeboard" means the vertical distance from the surface water level to the overflow elevation in a treatment unit.
"GPM" means gallons per minute.
"Land application" means the controlled application of treated wastewater onto the land surface for beneficial use.
"MGD" or "mgd" means million gallons per day.
"MLSS" means mixed liquor suspended solids.
"MLVSS" means mixed liquor volatile suspended solids.
"New technology" means any method, process or equipment which is used to treat or convey sewage which is not addressed in this Chapter. This does not refer to innovative technology as defined by 40 CFR Part 35 .
"NPDES" means the National Pollution Discharge Elimination System.
"OAC" means Oklahoma Administrative Code.
"OSHA" means the Occupational Health and Safety Administration.
"Open storage basin" means an uncovered basin, below or above ground level, that is designed, maintained and operated to store Category 2 or 3 reclaimed water.
"Person" means any individual, company, corporation, government agency, municipality, or any other entity.
"Population equivalent" and "PE" mean the calculated population which would normally contribute the same amount of biochemical oxygen demand (BOD) per day of wastewater. It is computed on the basis of 0.17 lb. of 5-day BOD per capita per day.
"PSRP" means process to significantly reduce pathogens.
"PVC" means polyvinyl chloride.
"Reclaimed water" means wastewater that has gone through various treatment processes to meet specific water quality criteria with the intent of being used in a beneficial manner.
"Retention time" means the theoretical time required to displace the contents of a tank or treatment unit at a given rate of flow (volume divided by rate of flow).
"Riprap" means a permanent, erosion resistant ground cover that consists of hard, sound durable stones that average in weight between thirty to fifty pounds (30-50 lbs), with no more than twenty percent (20%) weighing less than twenty pounds (20 lbs).
"Service line" means a wastewater line that connects an individual home, building or business to a permitted collection system.
"Total Kjeldahl nitrogen (TKN)" means the total of the organic and ammonia nitrogen.
"Treatment works" means any plant, disposal field, lagoon, incinerator or other facility used to treat, stabilize, hold or reclaim non-industrial wastewater.
"UL" means Underwriters Laboratories Inc.
" U.S.C." means United States Code.
"Variation" means change from the adopted or current standards for equipment, material or process.
"Wastewater system" means a collection system and treatment works.
"Water reuse system" means a treatment and distribution system designed to treat and supply reclaimed water.
Okla. Admin. Code § 252:656-1-2