40 CFR 430.33: Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best conventional pollutant control technology (BCT).

Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart shall achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best conventional pollutant control technology (BCT), except that non-continuous dischargers shall not be subject to the maximum day and average-of-30-consecutive-days limitations, but shall be subject to annual average effluent limitations:

Subpart C

[BCT effluent limitations for unbleached kraft facilities]

Pollutant or pollutant property Kg/kkg (or pounds per 1,000 lb) of product

Continuous dischargers Non-continuous dischargers (annual average)

Maximum for any 1 day Average of daily values for 30 consecutive days

BOD5 5.6 2.8 1.9

TSS 12.0 6.0 3.6

pH (1) (1) (1)

1 Within the range of 6.0 to 9.0 at all times.

Subpart C

[BCT effluent limitations for unbleached kraft-neutral sulfite semi-chemical (cross recovery) process and/or a combined unbleached kraft and semi-chemical process, wherein the spent semi-chemical cooking liquor is burned within the unbleached kraft chemical recovery system]

Pollutant or pollutant property Kg/kkg (or pounds per 1,000 lb) of product

Continuous dischargers Non-continuous dis- chargers (annual average)

Maximum for any 1 day Average of daily values for 30 consecutive days

BOD5 8.0 4.0 2.9

TSS 12.5 6.25 3.57

pH (1) (1) (1)

1 Within the range of 6.0 to 9.0 at all times.