New Hampshire Code of Administrative Rules
Env - Department of Environmental Services
Subtitle Env-Wq - Water Quality and Quantity Programs
Chapter Env-Wq 1000 - SUBDIVISIONS; INDIVIDUAL SEWAGE DISPOSAL SYSTEMS
Part Env-Wq 1012 - GRAVITY GREASE INTERCEPTORS AND FLOOR DRAINS
Section Env-Wq 1012.02 - Gravity Grease Interceptor Design Requirements
Current through Register No. 13, March 27, 2025
(a) The gravity grease interceptor shall be sized to have a minimum hydraulic detention time of 36 hours and minimum tank size of 1,000 gallons.
(b) The outlet of the gravity grease interceptor shall be protected with a baffle that extends downward and terminates 6 to 12 inches from the inside bottom of the gravity grease interceptor.
(c) A gravity grease interceptor shall meet the requirements of:
(d) All connections between a gravity grease interceptor and the pipes leading to and exiting from the tank shall be sealed with a watertight, flexible connector that:
(e) Any precast concrete gravity grease interceptor shall be certified by its manufacturer or distributer as meeting the applicable requirements of ASTM C1613.
(f) Fiber-reinforced polyester used for manufacturing gravity grease interceptors and components shall be certified by its manufacturer or distributer as meeting the applicable requirements of section 6 of IAPMO/ANSI Z1000.
(g) Thermoplastic gravity grease interceptors and components shall be certified by its manufacturer or distributer as meeting the applicable requirements of section 7 of IAPMO/ANSI Z1000.
(See Revision Note at chapter heading for Env-Wq 1000) #9086, eff 2-9-08