Statutes, codes, and regulations
Louisiana Administrative Code
Title 33 - ENVIRONMENTAL QUALITYPart IX - Water QualitySubpart 2 - The Louisiana Pollutant Discharge Elimination System (LPDES) Program
Chapter 59 - Secondary Treatment under the LPDES Program
Section IX-5911 - Treatment Equivalent to Secondary Treatment

La. Admin. Code tit. 33 § IX-5911

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Current through Register Vol. 50, No. 6, June 20, 2024
Section IX-5911 - Treatment Equivalent to Secondary Treatment

This Section describes the minimum level of effluent quality attainable by facilities eligible for treatment equivalent to secondary treatment (LAC 33:IX.5903.Facilities Eligible for Treatment Equivalent to Secondary Treatment) in terms of the parameters BOD5, TSS, and pH. All requirements for the specified parameters in LAC 33:IX.5911.A, B, and C shall be achieved except as provided for in LAC 33:IX.5907, or 5911.D, E, or F.

A. BOD5
1. The 30-day average shall not exceed 45 mg/L.
2. The 7-day average shall not exceed 65 mg/L.
3. The 30-day average percent removal shall not be less than 65 percent.
B. TSS. Except where TSS values have been adjusted in accordance with LAC 33:IX.5907.C:
1. the 30-day average shall not exceed 45 mg/L;
2. the 7-day average shall not exceed 65 mg/L;
3. the 30-day average percent removal shall not be less than 65 percent.
C. pH. The requirements of LAC 33:IX.5905.C shall be met.
D. Alternative State Requirements. Except as limited by LAC 33:IX.5911.F, and after notice and opportunity for public comment, the state administrative authority, subject to EPA approval, is authorized to adjust the minimum levels of effluent quality set forth in LAC 33:IX.5911.A.1-2, and B.1-2 for trickling filter facilities and in LAC 33:IX.5911.A.1-2 for waste stabilization pond facilities, to conform to the BOD5 and TSS effluent concentrations consistently achievable through proper operation and maintenance (LAC 33:IX.5903) by the median (50th percentile) facility in a representative sample of facilities within the state or appropriate contiguous geographical area that meet the definition of facilities eligible for treatment equivalent to secondary treatment (LAC 33:IX.5903).
E. CBOD5 Limitation
1. Where data are available to establish CBOD5 limitations for a treatment works subject to this Section, the LPDES permitting authority may substitute the parameter CBOD5 for the parameter BOD5 in LAC 33:IX.5911.A.1-3, on a case-by-case basis provided that the levels of CBOD5 effluent quality are not less stringent than the following.
a. The 30-day average shall not exceed 40 mg/L.
b. The 7-days average shall not exceed 60 mg/L.
c. The 30-day average percent removal shall not be less than 65 percent.
2. Where data are available, the parameter CBOD5 may be used for effluent quality limitations established under LAC 33:IX.5911.D. Where concurrent BOD effluent data are available, they must be submitted with the CBOD data as a part of the approval process outlined in LAC 33:IX.5911.D.
F. Permit Adjustments. Any permit adjustment made pursuant to this Chapter may not be any less stringent than the limitations required pursuant to LAC 33:IX.5911.A-E. Furthermore, permitting authorities shall require more stringent limitations when adjusting permits if:
1. for existing facilities the permitting authority determines that the 30-day average and 7-day average BOD5 and TSS effluent values that could be achievable through proper operation and maintenance of the treatment works, based on an analysis of the past performance of the treatment works, would enable the treatment works to achieve more stringent limitations; or
2. for new facilities, the permitting authority determines that the 30-day average and 7-day average BOD5 and TSS effluent values that could be achievable through proper operation and maintenance of the treatment works, considering the design capability of the treatment process and geographical and climatic conditions, would enable the treatment works to achieve more stringent limitations.

La. Admin. Code tit. 33, § IX-5911

Promulgated by the Department of Environmental Quality, Office of Water Resources, LR 21:945 (September 1995), amended by the Water Pollution Control Division, LR 23:726 (June 1997), repromulgated by the Office of Environmental Assessment, Environmental Planning Division, LR 30:232 (February 2004), amended by the Office of Environmental Assessment, LR 31:439 (February 2005).
AUTHORITY NOTE: Promulgated in accordance with R.S. 30:2001 et seq., and in particular Section 2074(B)(3) and (B)(4)