North Dakota Administrative Code › Title 62 - State Board of Plumbing › Article 62-03.1 - Plumbing Installation Standards › Chapter 62-03.1-03 - Private Sewage Disposal Systems › Section 62-03.1-03-03 - Design of individual sewage system

Current through Supplement No. 393, July, 2024
1.
Design.
The design of the individual sewage treatment system must take into
				consideration location with respect to wells or other sources of water supply,
				topography, water table, soil characteristics, area available, and maximum
				occupancy of the building.
2.
Type of system.
The type of system to be installed shall be
				determined on the basis of location, soil permeability, and ground water
				elevation.
3.
Sanitary
				sewage.
The system shall be designed to receive all sanitary sewage,
				including laundry waste, from the building. Drainage from footings or roofs
				shall not enter the system.
4.
Discharge.
The system shall consist of a septic tank discharging
				into either a subsurface treatment field or one or more seepage beds or into a
				combination of both, if found adequate as such and approved by the
				administrative authority.
5.
Ground water.
No plumbing fixture may be connected to any
				individual sewage treatment system where ground water may collect above the
				sewage treatment system causing a flooded condition, unless the elevation of
				the fixture trap is a sufficient height above the elevation of the finished
				grade of the ground in which the sewage treatment field is installed to prevent
				backup. The minimum separation distance from the bottom of the treatment area
				must equal or exceed twenty-four inches [60.96 centimeters].
6.
Alternate design.
Where soil
				conditions are such that neither of the systems mentioned in subsection 4 can
				be expected to operate satisfactorily, approval of an alternate design shall be
				secured from the administrative authority.
7.
Sewage flow.
Design criteria
				for sewage flow according to the type of establishment is indicated in the
				following table:
SEWAGE FLOWS ACCORDING TO TYPE OF
							 ESTABLISHMENT
Type of Establishment
Gallons Per Person Per Day (Unless Otherwise Noted)
Airports (per passenger) ............................
5
Apartments-multiple family (per resident) ...........
60
Assembly halls (per seat) ...........................
2
Bars (per seat) .....................................
5
Bathhouses and swimming pools .......................
10
Bowling alleys (per lane) ...........................
75
Camps:
Campground with central comfort stations ..........
35
With flush toilets, no showers ....................
25
Construction camps (semipermanent) ................
50
Day camps (no meals served) .......................
15
Resort camps (night and day) with limited plumbing
							 ........................................
50
Luxury camps ......................................
100
Churches (per sanctuary seat) .......................
5
Churches with kitchens (per sanctuary seat) .........
7
Cottages and small dwellings with seasonal occupancy
							 .........................................
50
Country clubs (per member present) ..................
25
Dwellings:
Boardinghouses ....................................
50
Additional for nonresident boarders .............
10
Luxury residences and estates .....................
150
Multiple family dwellings (apartments) ............
60
Roominghouses .....................................
40
Single-family dwellings ...........................
75
Factories (gallons per person, per shift, exclusive of
							 industrial wastes) ................................
35
Hospitals (per bed space) ...........................
250
Hotels (per guest) ..................................
50
Institutions other than hospitals (per bed space) ...
100
Laundries, self-service (gallons per machine) .......
500
Mobile home parks (per space) .......................
250
Motels (per bed space) ..............................
50
Picnic parks (sanitary waste only) ..................
5
Picnic parks with bathhouses, showers, and flush
							 toilets .................................
10
Restaurants (toilet and kitchen wastes per patron) ..
10
Restaurants (kitchen wastes per meal served) ........
3
Restaurants additional for bars and cocktail lounges
							 ..................................
2
Schools:
Boarding ..........................................
75
Day, without gyms, cafeterias, or showers .........
15
Day, with gyms, cafeteria, and showers ............
25
Day, with cafeteria, but without gyms or showers
							 ......................................
20
Service stations (per vehicle served) ...............
10
Theaters:
Movie (per auditorium seat) .......................
5
Drive-in (per car space) ..........................
5
Travel trailer parks without individual water and
							 sewer hookups (per space) .........................
50
Travel trailer parks with individual water and sewer
							 hookups (per space) .........................
100
Workers:
Construction (at semipermanent camps) .............
50
Day, at school and offices (per shift) ............
15
General Authority: NDCC 43-18-09
Law Implemented: NDCC 43-18-09