APPENDIX B — FOR PRIVATE SEWAGE DISPOSAL SYSTEMS

1) Location

2) Soil Porosity

3) Ground Water Level

Basis for type of private sewage disposal system (3)

14 sq.m.

Minimum trench bottom for each system when disposal fields are installed, exclusive of any hard pan, rock, clay or other impervious formations.

Anaerobic Bacteria

Bacteria that do not require oxygen to survive.

Aerobic Bacteria

Bacteria that require oxygen for survival.

Facultative Bacteria

Bacteria that can grow either with or without oxygen.

Pathogenic Bacteria

Bacteria that has no function in sewage treatment.

excess of required 304.8 to 914.4 mm below leach line

Side wall area that may be added to the trench bottom when computing absorption areas.

50%

Tubular area of each leaching bed (when permitted in lieu of trenches) compared to tubular requirements of trenches.

1.5 m

No excavation for a leach line or leach bed shall extend within ___ of the water table.

3 m

No excavation for seepage pits shall extend within ___ of the water table.

Percolation Test

Determines the absorption qualities of questionable soils.

excessive corrosion or decay

"Septic tanks design shall be constructed of solid durable materials, not subject to ___ and shall be watertight".

2

Minimum compartments of septic tanks.

Digestive Chamber

Inlet compartment of a septic tank.

Leaching Chamber

Secondary compartment of a septic tank.

2/3 (2 cu. m liquid capacity)

Minimum inlet compartment capacity of any septic tank.

1.5 m x 0.9 m

Minimum length and width of the septic tank.

0.6 m - 1.8 m

Liquid depth range for septic tanks.

1/3 total capacity (1 cu. m liquid capacity)

Minimum secondary compartment capacity of any septic tank.

6 cu.m.

Minimum septic tank capacity where minimum required length is 1.5 m.

508 mm

Minimum dimension of septic tank manhole.

2 (1 each, over the inlet and outlet)

Minimum number of manholes for a septic tank.

3.7 m

Minimum length for providing an additional manhole over the baffle wall.

104.6 mm

Minimum diameter for the vertical leg of a round inlet and outlet fittings (or equivalent size to the connecting sewer pipe whichever is larger).

101.6 mm

Extension of the inlet and outlet pipe or baffle above the water surface.

304.8 mm

Extension of the inlet and outlet pipe or baffle below the water surface.

50.8 mm

Minimum level of the invert of the inlet pipe above the invert of the outlet pipe.

free vent area

"Inlet and outlet pipe fittings or baffles, and compartment partitions shall have a ___ equal to the required cross-sectional area of the house sewer or private sewer discharging thereinto"

228.6 mm

Minimum side wall extension above the liquid depth.

50.8 mm

The cover of the septic tank shall be at least ________ above the back vent openings.

14.4 kPa

Minimum earth load capacity of septic tank covers when coverage does not exceed 9m.

bituminous coating

Covers all the internal area from corrosion extending to 101.6mm below the water line of a septic tank.

No. 12 US Gauge (2.8mm)

Steel Septic Tank: Wall thickness

19.1 mm to 63.5 mm

Size range for clean stone, gravel, slag, or similar filter material placed in trenches terminating at least 1.5m from the pit excavation.

25.4 mm

All smeared or compacted surfaces shall be removed from trenches by raking to a depth of ____________ and the loose material removed.

grade board

A __________ staked in the trench and utilized when the distribution line is constructed with drain tile or a flexible pipe material which will not maintain alignment without continuous support.

Distribution Box

Installed to receive 2 or more lateral drain lines at the head of each disposal field.

25.4 mm

Minimum distance of inverts of all outlets to the invert of the inlet.

Dosing Tank

Used when the quantity of sewage exceeds the amount that can be disposed in 152.1 linear meter of each line.

Dosing Tank with 2 Siphon Pumps

Used when the quantity of sewage exceeds the amount that can be disposed in 304.8 linear meter of each line; each pump dosing alternately and serving 1/2 of the leach field.

60 - 75%

Tank capacity in terms of the interior capacity of the pipe to be dosed.

0.9 m

Maximum distance of the perimeter of the leaching bed from a distribution drain line.

1.8 m

Minimum on-center spacing between distribution drain lines in each leaching bed.

1.2 m

Minimum spacing between trenches or leaching beds.

0.6 m

Added to spacing for each additional 3m of depth in excess of 3m below the bottom of the drain line.

evaporation

"Disposal fields, trenches and leaching beds shall not be paved over or covered by concrete of any material that can reduce or inhibit possible ___ of sewer effluent"

stepped

Necessary on sloping ground to prevent excessive line slope of leach lines or beds.

3.70 m

Septic Tank: Additional man hole if digestive chamber is longer than ____

Sanitary Tee

Septic Tank: Fittings used

101.6 mm

Septic Tank: Partitions or baffles shall extend at least ____ above the liquid level

F - prohibited

T or F: Wooden baffles may be used

101.6 mm

Concrete Septic Tank: The coating shall extend to at least ____ below the water line.

15 feet or 4.6 m

Spacing between leaching system and ground surface.