Specific Discharge Limitations/Local Limits

(1) Any discharge of the following materials is prohibited: (a) Into the Metropolitan Sewerage Service Area: 1. Mercury (enforced at 0.001 mg/l); 2. Polychlorinated Biphenyls (PCBs); 3. Pesticides, unless the Authority determines upon request that the substance is acceptable for Discharge to the Sanitary Sewer under the criteria for exclusion or exemption in 40 CFR Parts 152 and 455, or that the substance is otherwise acceptable to Discharge, and that the substance would not otherwise violate 360 CMR 10.021 through 310 CMR 10.024; and 4. Hexachlorobutadiene. (b) Into the Clinton Sewerage Service Area: 1. Mercury (enforced at 0.001 mg/l); 2. Polychlorinated Biphenyls (PCBs); 3. Pesticides, unless the Authority determines upon request that the substance is acceptable for discharge to the sanitary sewer under the criteria for exclusion or exemption in 40 CFR Parts 152 and 455, or that the substance is otherwise acceptable to discharge, and that the substance would not otherwise violate 360 CMR 10.021 through 310 CMR 10.024; 4. Hexachlorobutadiene; and 5. Substances listed in 360 CMR 10.000: Appendix C. (2) Any discharge of the following materials shall not exceed the daily maximum limit for that material: (a) Into the Metropolitan Sewerage Service Area: Material Daily Maximum Limit (mg/l) Acrolein 0.15 Antimony (total) 10.0 Arsenic (total) 0.5 Benzene 0.3 Cadmium (total) 0.1 Chromium (hexavalent) 0.5 Chromium (total) 1.0 Copper (total) 1.0 Cyanide (total) 0.5 Formaldehyde 9.0 Lead (total) 0.2 Nickel (total) 1.0 Phenol 5.0 Selenium (total) 5.0 Silver (total) 2.0 Each Toxic Organic 1.0, unless elsewhere limited in 360 CMR 10.000 for the Metropolitan Sewerage Service Area Total Toxic Organics 5.0 Vinyl Chloride 0.02 1,1 Dichloroethylene 0.3 Zinc (total) 1.0 (b) Into the Clinton Sewerage Service Area: Material Daily Maximum Limit mg/l Acrolein Aluminum (total) Arsenic (total) Benzene Bis(2-ethylhexyl)phthalate Bromomethane Cadmium (total) Carbon disulfide Carbon tetrachloride Chromium (hexavalent) Chromium (total) Copper (total) Cyanide (total) Cyclohexane 1,1-Dichloroethylene cis-1,3-Dichloropropene trans-1,3-Dichloropropene 2,4-Dinitrotoluene Formaldehyde Hexachloroethane Lead (total) Nickel (total) Nitrosamines N-Nitrosodibutylamine N-Nitrosodiethylamine N-Nitrosodimethylamine N-Nitrosodiphenylamine Pentachlorobenzene Selenium (total) Silver (total) 1,2,4,5-Tetrachlorobenzene Trichlorofluoromethane Each Toxic Organic Total Toxic Organics Zinc 0.5 30.0 0.5 0.4 0.2 0.2 0.5 0.6 0.1 1.0 5.0 1.0 1.0 0.6 0.2 0.6 0.1 0.2 9.0 0.2 0.2 2.0 0.1 0.1 0.1 0.2 0.5 0.2 1.0 1.0, except 2.0 for a Group Permit for Photo Processing and Printing Operations, and a Combined Permit 0.1 0.3 1.0, unless elsewhere limited in 360 CMR 10.000 for the Clinton Sewerage Service Area 5.0 5.0 (3) The Daily Maximum Limit shall be determined on the basis of a Composite Sample, except a Grab Sample or Samples may be used in the following circumstances: (a) for a batch discharge, when the Grab Sample would be fairly representative of the batch as a whole; (b) for pollutants that are not amenable to composite sampling of an industrial wastestream by use of an automatic wastewater sampler, such as hexavalent chromium and volatile organics; or (c) when the Authority determines it is not feasible or appropriate to take a Composite Sample, such as when the discharge is of too short duration for automatic composite sampling or the sampling location is inaccessible for an automatic wastewater sampler. A Composite Sample shall be taken at preselected intervals throughout the time in a day (or in a consecutive 24-hour period over two days when there is a continuous discharge of at least 24 hours over the course of the two days) during which the wastewater is discharged, except a shorter time period may be used if that shorter time period encompasses all or most of the wastewater discharge that day (or consecutive 24-hour period when there is a continuous discharge over the course of two days) or if a shorter period is authorized by the Authority. A batch discharge may have a Composite Sample taken throughout the discharge of the batch. A flow proportioned Composite Sample shall be taken, except a time interval Composite Sample may be taken when the Authority determines it is not feasible or appropriate to take a flow proportioned Composite Sample. If a Grab Sample may appropriately be used, and more than one Grab Sample of a Discharge is taken during the day, the Daily Maximum Limit shall be measured by either the mathematical average of the analytical results of the Grab Samples or the analytical result of a composite of the Grab Samples.