Section 434.23 - Effluent limitations guidelines representing the degree of effluent reduction attainable by application of the best available technology economically achievable (BAT)(a) Except as provided in 40 CFR 125.30-125.32 , and §§ 434.61 , 434.62 and 434.63 of this part, the following limitations establish the concentration or quality of pollutants which may be discharged by any existing coal preparation plant and coal preparation plant associated areas subject to the provisions of this subpart after application of the best available technology economically achievable if discharges from such point sources normally exhibit a pH of less than 6.0 prior to treatment: BAT Effluent Limitations
| Pollutant or pollutant property | Maximum for any 1 day | Average of daily values for 30 consecutive days |
| Concentration in mg/l |
| Iron, total | 7.0 | 3.5 |
| Manganese, total | 4.0 | 2.0 |
(b) Except as provided in 40 CFR 125.30-125.32 , and §§ 434.61 and 434.63 of this part, the following limitations establish the concentration or quality of pollutants which may be discharged by any existing coal preparation plant and coal preparation plant associated areas subject to the provisions of this subpart after application of the best available technology economically achievable if discharges from such point sources normally exhibit a pH equal to or greater than 6.0 prior to treatment: BAT Effluent Limitations
| Pollutant or pollutant property | Maximum for any 1 day | Average of daily values for 30 consecutive days |
| Concentration in mg/l |
| Iron, total | 7.0 | 3.5 |