Louisiana Administrative Code › Title 33 - ENVIRONMENTAL QUALITY › Part IX - Water Quality › Subpart 2 - The Louisiana Pollutant Discharge Elimination System (LPDES) Program › Chapter 59 - Secondary Treatment under the LPDES Program › Section IX-5903 - Definitions

Current through Register Vol. 50, No. 6, June 20, 2024
A. Terms used in
				  this Chapter are defined as follows.
7-Day Average
- the arithmetic mean of
					 pollutant parameter values for samples collected in a period of seven
					 consecutive days.
30-Day Average
- the arithmetic mean of
					 pollutant parameter values of samples collected in a period of 30 consecutive
					 days.
Act
- the Clean Water Act (CWA) as defined
					 in LAC 33:IX.2313 and the appropriate provisions of the LEQA and
					 regulations.
BOD5
- the five day
					 measure of the pollutant parameter biochemical oxygen demand (BOD).
CBOD5
- the five
					 day measure of the pollutant parameter carbonaceous biochemical oxygen demand
					 (CBOD).
Effluent Concentrations Consistently Achievable
					 through Proper Operation and Maintenance
- for a given pollutant
					 parameter:
a. the 95th percentile value for the 30-day average
					 effluent quality achieved by a treatment works in a period of at least two
					 years excluding values attributable to upsets, bypasses, operational errors, or
					 other unusual conditions; and
b. a 7-day average value equal to 1.5 times the value
					 derived under LAC 33:IX.5903.A.
Effluent Concentrations Consistently
					 Achievable through Proper Operation and Maintenance.
a.
a. the BOD5 and TSS effluent
					 concentrations consistently achievable through proper operation and maintenance
					 (LAC 33:IX.5903.A.
Effluent Concentrations Consistently Achievable
					 through Proper Operation and Maintenance
) of the treatment works
					 exceed the minimum level of the effluent quality set forth in LAC 33:IX.5905.A
					 and B;
b. a trickling filter or waste stabilization pond is used
					 as the principal process; and
c. the treatment works provide significant biological
					 treatment of municipal wastewater.
mg/L
- milligrams per liter.
NPDES
- National Pollutant Discharge
					 Elimination System.
Percent Removal
- a percentage expression
					 of the removal efficiency across a treatment plant for a given pollutant
					 parameter, as determined from the 30-day average values of the raw wastewater
					 influent pollutant concentrations to the facility and the 30-day average values
					 of the effluent pollutant concentrations for a given time period.
Significant Biological Treatment
- the use
					 of an aerobic or anaerobic biological treatment process in a treatment works to
					 consistently achieve a 30-day average of at least 65 percent removal of
					 BOD5.
Significantly More Stringent Limitation
-
					 the BOD5 and TSS limitations necessary to meet the
					 percent removal requirements of at least 5 mg/L more stringent than the
					 otherwise applicable concentration-based limitations (e.g., less than 25 mg/L
					 in the case of the secondary treatment limits for BOD5
					 and TSS), or the percent removal limitations in LAC 33:IX.5905 and 5911, if
					 such limits would, by themselves, force significant construction or other
					 significant capital expenditure.
State Administrative Authority
- the chief
					 administrative officer of any state or interstate agency operating an approved
					 program, or the delegated representative of the state administrative authority.
					 If responsibility is divided among two or more state or interstate agencies,
					 state administrative authority means the chief administrative officer of the
					 state or interstate agency authorized to perform the particular procedure or
					 function to which reference is made.
TSS
- the pollutant parameter total
					 suspended solids.
AUTHORITY NOTE:
					 Promulgated in accordance with
					 R.S.
					 30:2001 et seq., and in particular Section
					 2074(B)(3) and (B)(4)