Sec. 860.4. Effluent quality requirements

(a) Minimum treatment.

All wastes shall receive a minimum of secondary treatment, regardless of the stated stream quality objective.

(b) Disinfection.

Wastes (exclusive of stormwater bypass) containing human excreta or disease-producing organisms shall be effectively disinfected before being discharged into surface bodies of water as needed to meet applicable commission or State water quality standards.

(c) Public safety.

Effluents shall not create a menace to public health or safety at the point of discharge.

(d) Limits.

(1) Discharges shall not contain more than negligible amounts of debris, oil, scum, or other floating materials, suspended matter which will settle to form sludge, toxic substances, or substances or organisms that produce color, taste, odor of the water, or taint fish or shellfish flesh.

(i) Suspended solids.

(a) For wastewater treatment facilities, not to exceed:

(1) 30 mg/l as a 30-day average; and

(2) 45 mg/l as a 7-day average.

(b) For industrial wastewater treatment facilities' discharges with a concentration greater than in subclauses (a)(1)-(2) of this subparagraph:

(1) up to 100 mg/l as a 30-day average may be permitted; and

(2) at least 85 percent reduction as a 30-day average is achieved, as may be modified by section 860.6(d)(3) of this Part.

(c) The limit in subclause (b)(1) of this subparagraph may be waived upon application, if it is determined that there is an established USEPA best conventional pollutant control technology (BCT) effluent limitation and that the treatment level meets the applicable BCT limitation.

(ii) Oil and grease.

(a) Oil storage terminal runoff.

(1) Oil storage terminal runoff shall not exhibit readily visible oil.

(2) Control facilities shall be designed and operated such that the concentration of oil and grease in the effluent shall not exceed 15 mg/l as the average of samples taken during any single storm event during which:

(i) precipitation is not greater than two inches per hour or 4 1/2 inches in 24 hours; or

(ii) a maximum runoff of 80 gallons per minute per acre over a 24-hour period occurs.

(3) In implementing this standard, signatory parties may adopt and apply either effluent and monitoring standards, or best management practices for design, operation and maintenance of control facilities, provided that the commission reserves the power to monitor discharges and enforce the 15 mg/l oil and grease standard in subparagraph (ii) of this paragraph as an effluent limit.

(4) The average oil and grease concentration for any storm discharge event shall be determined from samples collected in such manner and such location as to be representative of the actual discharge.

(b) Industrial wastewater discharges. Industrial wastewater discharges shall not exceed the limits as prescribed in the U.S. Environmental Protection Agency's promulgated effluent standards for the industrial category in question.

(2) Total dissolved solids shall not exceed 1,000 mg/l, or a concentration established by the commission which is compatible with designated water uses and stream quality objectives, and recognizes the need for reserve capacity to serve future dischargers.

(e) Allocation of capacity.

Where necessary to meet the stream quality objectives, the waste assimilative capacity of the receiving waters shall be allocated in accordance with the doctrine of equitable apportionment.

(f) Intermittent streams.

(1) Discharges to intermittent streams may be permitted by the commission only if the applicant can demonstrate that there is no reasonable economical alternative, the project is environmentally acceptable, and would not violate the stream quality objectives set forth in section 860.3(a)(1)(i) of this Part.

(2) Discharges to intermittent streams shall be adequately treated to protect stream uses, public health and ground water quality, and prevent nuisance conditions.