Section Env-Wq 704.10 - Grinder Pumps for Pressure Sewers(a) A pressure sewer system shall have at least one grinder pump at each building or residence that is connected to the system.(b) The minimum capacity requirements for each grinder pump connected to a pressure sewer system shall be determined based on hydraulic modeling of the entire pressure sewer system and the main sewer to which the pressure sewer is proposed to be connected.(c) Grinder pumps for pressure sewer systems shall be: (2) Readily removable without manual disconnection of piping;(3) Rotating type with a stationary hardened and ground stainless steel shredding ring with stainless steel cutters;(4) Capable of reducing all components in typical domestic sewage, including a reasonable number of foreign objects, including but not limited to wood, paper, plastic, glass, and rubber, to a size that will pass through pump passages and a 1.25-inch nominal diameter pipe;(5) Positioned so solids are fed into pump from the bottom in an upward flow;(6) Capable of processing foreign objects without jamming, stalling, or overloading;(7) Accessible for maintenance and replacement;(8) Installed within a manhole meeting the requirements of Env-Wq 704.12 through Env-Wq 704.17 or in a tank meeting the requirements of Env-Wq 704.10(d); and(9) Equipped with: a.Non-fouling sensing devices for high level alarms;b.A visible alarm light; and(d) A grinder pump tank shall consist of:(1) A manhole meeting the requirements of Env-Wq 704.12 through Env-Wq 704.17;(2) A reinforced concrete tank meeting HS-20 requirements;(3) A high density polyethylene tank; or(4) A fiberglass-reinforced polyester resin using a filament wound process, layup and spray technique.N.H. Code Admin. R. Env-Wq 704.10
(See Revision Note at chapter heading for Env-Wq 700) #8590, eff 3-25-06
Amended byVolume XXXIV Number 46, Filed November 13, 2014, Proposed by #10693, Effective 10/15/2014, Expires10/15/2024.