Oklahoma Administrative Code › Title 252 - Department of Environmental Quality › Chapter 606 - Oklahoma Pollutant Discharge Elimination System (OPDES) Standards › Subchapter 5 - Discharge Permit Requirements › Section 252:606-5-2 - Technology-based methodologies

Current through Vol. 41, No. 20, July 1, 2024
Technology-based methodologies include:
(1)
Industrial permits.
Effluent
				limitation guidelines for industry categories and pollutants are promulgated by
				the EPA pursuant to the Federal Water Pollution Control Act, as amended by the
				Clean Water Act of 1977 and Water Quality Act of 1987. EPA guidelines are
				adopted and incorporated by reference in
				252:606-1-5.
				If there are no industry category or pollutant guidelines applicable to the
				applicant's industry, BPJ of the permit writer applies.
(2)
Municipal permits.
(A) Technology -based limitations for
				municipal discharges are based upon the definition of "secondary treatment".
				The Oklahoma definition of "secondary treatment" is more stringent than the EPA
				definition under 40 CFR Part 133. Subparagraphs (B) through (G) of this
				paragraph contain the EPA approved definition of "secondary treatment" for the
				State of Oklahoma, which is used in the development of wasteload allocations in
				the municipal point source inventory.
(B) For facilities discharging to perennial
				streams, "secondary treatment" is defined as:
(i) A monthly average of 30 mg/l Biochemical
				Oxygen Demand - 5 day (BOD 5 ). A Carbonaceous
				Biochemical Oxygen Demand - 5 Day (CBOD5 ) of 25 mg/l is
				considered to be equivalent to a BOD 5 of 30
				mg/l.
(ii) A weekly average of 45
				mg/l BOD5. A CBOD 5 of 40 mg/l is
				considered to be equivalent to a BOD 5 of 45
				mg/l.
(iii) The monthly average
				percent removal for BOD 5 or CBOD
				5 cannot be less than 85%.
(iv) A monthly average of 30 mg/l total
				suspended solids (TSS).
(v) A
				weekly average of 45 mg/l TSS.
(vi)
				The monthly average percent removal for TSS cannot be less than 85%.
(vii) The pH must be maintained between the
				limits of 6.5 and 9.0 standard units.
(C) For discharges to intermittent streams
				(those with 7-day, 2-year, low flow of zero) and for any discharge to a lake as
				defined in this Section, secondary treatment is defined as:
(i) A monthly average of 20 mg/l
				BOD5. A CBOD5 of 18 mg/l is
				considered to be equivalent to a BOD5 of 20
				mg/l.
(ii) A weekly average of 30
				mg/l BOD5. A CBOD5 of 25 mg/l is
				considered to be equivalent to a BOD5 of 30
				mg/l.
(iii) The monthly average
				percent removal for BOD5 or CBOD5
				cannot be less than 85%.
(iv) A
				monthly average of 30 mg/l TSS.
(v)
				A weekly average of 45 mg/l TSS.
(vi) The monthly average percent removal for
				TSS cannot be less than 85%.
(vii)
				The pH must be maintained between the limits of 6.5 and 9.0 standard
				units.
(D) For
				discharges where treatment is solely provided by lagoons, whether the discharge
				is to a perennial or an intermittent stream, secondary treatment is defined as:
(i) A monthly average of 30 mg/l
				BOD5. A CBOD5 of 25 mg/l is
				considered to be equivalent to a BOD5 of 30
				mg/l.
(ii) A weekly average of 45
				mg/l BOD5. A CBOD5 of 40 mg/l is
				considered to be equivalent to a BOD5 of 45
				mg/l.
(iii) The monthly average
				percent removal for BOD5 or CBOD5
				cannot be less than 65%.
(iv) A
				monthly average of 90 mg/l TSS.
(v)
				A weekly average of 135 mg/l TSS.
(vi) The pH must be maintained between the
				limits of 6.5 and 9.0 standard units.
(vii) Subparagraph (D) does not apply to a
				discharge to a lake as defined in this Section.
(E) For purposes of this Section, a discharge
				to a lake is any discharge from a point source which is either a direct
				discharge into a lake, or within 5 river miles upstream of the conservation
				pool of any lake.
(F) For purposes
				of this Section, a lake is an impoundment of the waters of the state which
				exceeds 50 acre-feet in volume which:
(i) is
				owned or operated by a unit of government,
(ii) appears in Oklahoma's Clean Lakes
				Inventory, or
(iii) is a
				privately-owned lake which has beneficial uses similar to those of
				publicly-owned or operated lakes.
(G) For purposes of this Section, percent
				removal is a percentage expression of the removal efficiency across a treatment
				plant for a given pollutant parameter, as determined from the monthly average
				values of the raw wastewater influent pollutant concentrations to the facility
				and the monthly average values of the effluent pollutant concentrations for a
				given time period.