Users shall provide wastewater treatment as necessary to comply with this regulation and shall achieve compliance with all USEPA categorical pretreatment standards, local limits, prohibitions and requirements set out in §§ 435-2.4, 435-2.5 and 435-2.6 of this regulation within the time limitations specified by the EPA, the MADEP or the Department, whichever is more stringent. All facilities required to achieve and maintain compliance shall be provided, operated and maintained at the user's expense. Detailed plans describing such facilities and operating procedures shall be submitted to the Department for review, and shall be acceptable to the Department and the MADEP before such facilities are constructed. The review of such plans and operating procedures shall in no way relieve the user from the responsibility of modifying such facilities as necessary to produce a discharge acceptable to the Town under the provisions of this regulation.
A. 
Whenever deemed necessary to protect the POTW and determine the user's compliance with the requirements of this regulation, the Department may require users to restrict their discharge during peak flow periods, designate that certain wastewater be discharged only into specific sewers, relocate and/or consolidate points of discharge, separate sewage waste streams from industrial waste streams, and such other conditions as may be necessary.
B. 
The Department may require any person discharging into the POTW to install and maintain, on their property and at their expense, a suitable storage and flow-control facility to ensure equalization of flow. An industrial discharge permit may be issued solely for flow equalization.
C. 
Grease traps, oil and grit traps, and interceptors.
(1) 
All food service and preparation establishments shall have an adequate grease trap installed between the establishment and the Town sanitary sewer service connection. Grease traps and/or oil and grit traps shall also be required for commercial or industrial establishments such as, but not limited to, restaurants, laundries, wash racks, vehicle service stations, private multi-user systems, engine or machinery repair shops and other facilities that produce grease, grit, oil, lint or other materials which accumulate and cause or threaten to cause stoppages or impair the efficiency of the Town's sewers, or if it is determined that the amount of grease introduced into the system is in excess of 100 mg/l per day.
(2) 
The design, construction and installation of any such device in accordance with this section and Attachment F shall be subject to prior approval of the Department or the Town's Building Inspector.
(3) 
The grease or oil and grit trap is to be located on establishment property.
(4) 
The grease trap shall have a minimum of two compartments.
(5) 
While operating at the trap's rated flow capacity, the first compartment must provide a retention time of no less than seven minutes, and the second compartment must provide a retention time of no less than five minutes.
(6) 
Trap inverts and vents shall be external to the compartments. The flowline to the trap (upstream of inlet invert) must be at least three inches above the static water level of the tank. The trap vent must be at least three inches above the static water level of the tank. The trap inlet must be at least 24 inches below the static water level of the tank, and the trap outlet must be at least 12 inches above the floor of the tank.
(7) 
Adequate flow diffusion features must be provided to evenly distribute flow throughout the grease trap. Examples of such features would include a flow diverter plate in the primary compartment, "tee" piping between the two trap compartments and "tee" piping on the tank outlet.
(8) 
Each trap compartment shall be accessible for cleaning and inspection purposes at all times.
(9) 
Exceptions to certain of these criteria may be considered for approval in the plan review process. In such cases, engineering drawings and supporting performance data must be submitted to and approved by the Department prior to grease trap installation. Grease traps of alternative designs may be approved for those sites needing grease traps of 250 gallons or less.
(10) 
Maintenance. All grease traps and oil/grit traps shall be cleaned as needed to ensure proper operation in accordance with 3.10 CMR (15.230). They shall be cleaned at least once per year. Maintenance and cleaning records shall be kept and shall be made available to the Department upon request.
(11) 
Failing systems. Any commercial or industrial facility that is currently operating a grease retention system and experiences a blockage due to a failing system will be required to reimburse the Department for any service-related activity required to remove the blockage; and if the current system is found to be undersized or otherwise inadequate, upgrade the system within a specified time period agreed to between the owner and the Department.
(12) 
Termination of service. In cases where grease trap or interceptor systems are found to be inadequate due to under-sizing, where blockages have occurred more than once, where the wastewater discharge of the establishment exceeds 100 mg/l per day, or monthly average of 25 mg/l per day, or where the systems are not in place, the Department shall have the option to discontinue water service to the responsible establishment until such time that an inspection by the Department determines that the installation or completion of repairs to the grease interceptor system is satisfactory.
D. 
Users with the potential to discharge flammable substances may be required to install and maintain an approved combustible gas detection meter and alarm.
E. 
Where pretreatment or flow-equalizing facilities are provided or required for any waters or wastes, these devices shall be maintained continuously to ensure satisfactory and effective operation by the owner at his expense.
As necessary, the Department may evaluate whether each significant industrial user needs an accidental discharge/slug control plan and this requirement may be included in industrial discharge permits. The Department may require any user to develop, submit for approval and implement such a plan. Alternatively, the Department may develop such a plan for any user. An accidental discharge/slug control plan shall address, at a minimum, the following:
A. 
Description of discharge practices, including non-routine batch discharges;
B. 
Description of stored chemicals;
C. 
Procedures for immediately notifying the Department of any accidental or slug discharge, as required by § 435-7.6 of this regulation; and
D. 
Procedures to prevent adverse impact from any accidental or slug discharge. Such procedures include, but are not limited to, inspection and maintenance of storage areas, handling and transfer of materials, loading and unloading operations, control of plant site runoff, worker training, building of containment structures or equipment, measures for containing toxic organic pollutants, including solvents, and/or measures and equipment for emergency response.
In accordance with the provisions of §§ 435-2.5, 435-2.6 and 435-11.3 of this regulation, the Department may require any person discharging wastes into the POTW to develop and implement, at that person's own expense, a pollution prevention plan. The Department may require users to submit as part of the pollution prevention plan information that demonstrates adherence to the following elements:
A. 
Management support. For changes to be effective, the visible support of top management is required. Management's support should be explicitly stated and include designation of a pollution prevention coordinator, goals and time frames for reductions in volume and toxicity of waste streams, and procedures for employee training and involvement.
B. 
Process characterization. A detailed process waste diagram shall be developed that identifies and characterizes the input of raw materials, the outflow of products and the generation of wastes.
C. 
Waste assessment. Estimates shall be developed for the amount of wastes generated by each process. This may include establishing and maintaining waste accounting systems to track sources, the rates and dates of generation and the presence of hazardous constituents.
D. 
Analysis of waste management economics. Waste management economic returns shall be determined based on the consideration of:
(1) 
Reduced raw material purchases;
(2) 
Avoidance of waste treatment, monitoring and disposal costs;
(3) 
Reductions in operations and maintenance expenses;
(4) 
Elimination of permitting fees and compliance costs; and
(5) 
Reduced liabilities for employee/public exposure to hazardous chemicals and cleanup of waste disposal sites.
E. 
Development of pollution prevention alternatives. Current and past pollution prevention activities should be assessed, including estimates of the reduction in the amount and toxicity of waste achieved by the identified actions. Opportunities for pollution prevention must then be assessed for identified processes where raw materials become or generate wastes. Technical information on pollution prevention should be solicited and exchanged, both from inside the organization and out.
F. 
Evaluation and implementation. Technically and economically feasible pollution prevention opportunities shall be identified and an implementation timetable with interim and final milestones shall be developed. The recommendations that are implemented shall be periodically reviewed for effectiveness. The review and approval of such pollution prevention plans by the Town shall in no way relieve the user from the responsibilities of modifying facilities as necessary to produce a discharge acceptable to the Town in accordance with the provisions of this regulation.