| #Q001 | administrative | unknown | guidance | Coverage Determination Reference | wastewater | For precise definitions of coverage, see the applicability sections in 40 CFR Part 424. | | high |
| #Q002 | administrative | unknown | mandatory | Regulatory Citation Correction | wastewater | The EPA promulgated the Metal Molding and Casting (MMC) Effluent Guidelines and Standards (40 CFR Part 464) in 1985. | | high |
| #Q003 | monitoring | reporting | mandatory | TTO Monitoring for Indirect Dischargers | wastewater | monitoring total toxic organics (TTO) in all subcategories for indirect dischargers (see 40 CFR 464.03(a)) | Applies to indirect dischargers in all subcategories | high |
| #Q004 | administrative | operational | guidance | POTW Standard Selection Option | wastewater | For indirect dischargers, which is the larger number of plants, POTWs may elect to establish mass-based or concentration-based standards based on the limitations or standards established in the regulations. | Applies to indirect dischargers discharging to POTWs | high |
| #Q005 | administrative | unknown | guidance | Applicability Review Instructions | wastewater | Please review the MMC Development Document regarding process operations and associated wastewaters covered in each subcategory (Sections 3 and 5) and the Appendices, notably Appendix C. | | high |
| #Q006 | administrative | unknown | guidance | Applicability Overlap Caution | wastewater | Special care needs to be given to potential for overlap of applicability to Metal Molding and Casting facilities with other categories, such as Metal Finishing | Specifically note core operations for 40 CFR Part 433, 467, or 468 | high |
| #Q007 | administrative | unknown | mandatory | Effluent Guideline Permit Incorporation | wastewater | The Effluent Guidelines are incorporated into NPDES permits for direct dischargers, and permits or other control mechanisms for indirect dischargers | | high |
| #Q008 | monitoring | reporting | mandatory | TTO Monitoring Parameter Specification | wastewater | a bulk parameter (oil and grease) for monitoring total toxic organics (TTO) in all subcategories for indirect dischargers (see 40 CFR 464.03(a)) | Applies to indirect dischargers in all subcategories | high |
| #Q009 | prohibition | treatment | mandatory | Zero Discharge Prohibition | wastewater | For three of the process segments, the technology basis of the regulations is 'no discharge of process wastewater pollutants.' | Applies to three specific process segments within the MMC categories. | high |
| #Q010 | administrative | unknown | mandatory | Coverage Determination Reference | wastewater | The EPA promulgated the Metal Molding and Casting (MMC) Effluent Guidelines and Standards (40 CFR Part 464) in 1985. | | high |
| #Q011 | administrative | reporting | mandatory | NPDES Permit Incorporation | wastewater | The MP&M regulation covers only direct dischargers and the requirements are incorporated into NPDES permits. | Applies to direct dischargers that manufacture, rebuild, or maintain finished metal products and generate oily wastewater. | high |
| #Q012 | operational | treatment | mandatory | BPT Operational Control | wastewater | In-process flow control and pollution prevention | Facilities directly discharging wastewater from oily operations in the Oily Wastes subcategory. | high |
| #Q013 | treatment | treatment | mandatory | BPT Treatment Method | wastewater | Oil-water separation by chemical emulsion breaking and skimming | Facilities directly discharging wastewater from oily operations in the Oily Wastes subcategory. | high |
| #Q014 | administrative | reporting | mandatory | Direct Discharge Applicability | wastewater | The MP&M effluent limitations apply only to facilities that directly discharge wastewater from oily operations in the Oily Wastes subcategory. | Applies only to direct dischargers in the Oily Wastes subcategory | high |
| #Q015 | operational | treatment | mandatory | BPT Operational Control | wastewater | In-process flow control and pollution prevention | Part of best practicable control technology (BPT) for oily operations | high |
| #Q016 | treatment | treatment | mandatory | BPT Treatment Method | wastewater | Oil-water separation by chemical emulsion breaking and skimming | Part of best practicable control technology (BPT) for oily operations | high |
| #Q017 | administrative | unknown | mandatory | Facility Applicability Criteria | wastewater | The regulation (40 CFR Part 438) applies to about 2,400 facilities that manufacture, rebuild, or maintain finished metal products, parts, or machines, and generate oily wastewater. | Facilities manufacturing, rebuilding, or maintaining finished metal products and generating oily wastewater | high |
| #Q018 | administrative | unknown | mandatory | Industrial Sector Performance Standards | wastewater | the regulation sets performance standards for facilities in these industrial sectors: Aerospace, Aircraft, Bus and Truck, Electronic Equipment, Hardware, Household Equipment, Instruments, Mobile Industrial Equipment, Motor Vehicle, Office Machine, Ordnance, Precious Metals and Jewelry, Railroad, Ships and Boats, Stationary Industrial Equipment, Miscellaneous Metal Products | Direct dischargers within the listed industrial sectors | high |
| #Q019 | operational | treatment | mandatory | BPT Basis - Flow Control and Pollution Prevention | wastewater | The regulation sets daily maximum limits for two pollutants, oil and grease (as hexane extractable material) and total suspended solids, based on the best practicable control technology (BPT) : 1. In-process flow control and pollution prevention | Facilities directly discharging wastewater from oily operations in the Oily Wastes subcategory | high |
| #Q020 | treatment | treatment | mandatory | BPT Basis - Oil-Water Separation | wastewater | The regulation sets daily maximum limits for two pollutants, oil and grease (as hexane extractable material) and total suspended solids, based on the best practicable control technology (BPT) : 2. Oil-water separation by chemical emulsion breaking and skimming | Facilities directly discharging wastewater from oily operations in the Oily Wastes subcategory | high |
| #Q021 | administrative | reporting | guidance | Administrative Contact Information | wastewater | For additional information regarding the MP&M effluent guidelines, please contact Ahmar Siddiqui (siddiqui.ahmar@epa.gov) or 202-566-1044. | | high |