Code of Maine Rules
06 - DEPARTMENT OF ENVIRONMENTAL PROTECTION
096 - DEPARTMENT OF ENVIRONMENTAL PROTECTION - GENERAL
Chapter 525 - EFFLUENT GUIDELINES AND STANDARDS
Sec2 096-525-3 - Secondary Treatment [see 40 CFR 133]
Subsection 096-525-3-II - Definitions [see 40 CFR 133.101]

Universal Citation: 06 ME Code Rules ยง 096-525-3-II

Current through 2024-38, September 18, 2024

Terms used in this section are defined as follows:

(a) 7-day average. The arithmetic mean of pollutant parameter values for samples collected in a period of 7 consecutive days.

(b) 30-day average. The arithmetic mean of pollutant parameter values of samples collected in a period of 30 consecutive days.

(c) Act. The Clean Water Act ( 33 U.S.C. 1251 et seq., as amended).

(d) BOD. The five day measure of the pollutant parameter biochemical oxygen demand (BOD).

(e) CBOD-5. The five day measure of the pollutant parameter carbonaceous biochemical oxygen demand (CBOD-5).

(f) Effluent concentrations consistently achievable through proper operation and maintenance. (1) For a given pollutant parameter, 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 (2) a 7-day average value equal to 1.5 times the value derived under paragraph (f)(1) of this subsection.

(g) Facilities eligible for treatment equivalent to secondary treatment. Treatment works shall be eligible for consideration for effluent limitations described for treatment equivalent to secondary treatment (subsection VI), if:

(1) The BOD-5 and SS effluent concentrations consistently achievable through proper operation and maintenance (paragraph (f)) of the treatment works exceed the minimum level of the effluent quality set forth in Subsections III(a) and (b),

(2) A trickling filter or waste stabilization pond is used as the principal process, and

(3) The treatment works provide significant biological treatment of municipal wastewater.

(h) mg/l. Milligrams per liter.

(i) NPDES. National Pollutant Discharge Elimination System.

(j) 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.

(k) 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 a least 65 percent removal BOD-5.

(l) SS. The pollutant parameter total suspended solids.

(m) Significantly more stringent limitation means BOD-5 and SS 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 BOD-5 and SS), or the percent removal limitations in Subsections III and VI, if such limits would, by themselves, force significant construction or other significant capital expenditure.

Disclaimer: These regulations may not be the most recent version. Maine may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.