When required, interceptors and separators (including grease, oil and sand interceptors etc.) shall be provided when, in the opinion of the Administrative Authority, Allegheny County Sanitary Authority or Sanitary Authorities, they are necessary for the proper handling of liquid wastes containing grease, flammable wastes, sand, glass and other ingredients harmful to the building drainage system, the public sewer, treatment plant, or processes.
A. 
Approval. The size, type, and location of each interceptor or separator shall be approved by the Administrative Authority, and no wastes, other than those requiring treatment or separation, shall be discharged into any interceptor. Before installing any special type separator, a drawing, including all pertinent information, shall be submitted for approval to the Administrative Authority.
B. 
Grease interceptors. Grease interceptors where necessary or required, shall not be located in any kitchen or room where food is prepared, cooked, mixed, baked, smoked, preserved, exposed, bottled, packed, handled, stored or manufactured. This provision need not apply where a semi-automatic draw-off type grease interceptor is provided. No food waste grinder unit shall be connected to any grease interceptor.
C. 
Venting interceptors. Interceptors shall be so designed that they will not become air bound if closed covers are used. Each interceptor shall be properly vented. Oil or other flammable waste separators shall be provided with a three inch vapor vent extending from the top of the separator and terminating independently in the open air at an approved location at least 12 feet above grade or as approved by the Administrative Authority.
D. 
Interceptors and separators to be readily accessible. Each interceptor and separator shall be so installed that it is readily accessible for removal of cover, servicing and maintenance. Need for use of ladders or moving bulky objects in order to service interceptors shall constitute a violation of accessibility.
E. 
Maintenance of interceptors, separators and grease traps. Interceptors, separators and grease traps shall be maintained in efficient operating condition by periodic removal of accumulated grease, scum, oil or other floating substances and solids deposited in the interceptor, separator, or grease trap. When grease traps are installed, a maintenance schedule and records, including that hauler, shall be kept on the premise and made available upon request to the Administrative Authority.
Backwater valves, when required by other sections of this code or used on fixtures subject to backflow, shall be installed in accordance with requirements of the Administrative Authority.
A. 
Fixture branches below grade. Backwater valves shall be installed in the building drain branch which receives only the discharge from fixtures connected to branches which are located below grade and subject to backflow.
B. 
Materials for backwater valves. Backwater valves shall have all bearing parts of corrosion resistant material.
C. 
Construction of backwater valves. Backwater valves shall be constructed so a mechanical seal against backflow will be provided.
D. 
Diameter of backwater valves. Backwater valves, when fully opened, shall have a capacity not less than that of the pipes in which they are installed.
E. 
Location of backwater valves. Backwater valves shall be installed so their working parts will be accessible for service and repairs.