Appendix B - Private Sewage Disposal Systems
Exam Q’s and A’s
Location
Soil Porosity
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
-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
-150% - -tubular area of each leaching bed (when permitted in lieu of trenches) compared
to tubular requirements of trenches
-1.5m - -No excavation for a leach line or leach bed shall extend within ___ of the water
table
-3m - -No excavation for seepage pits shall extend within ___ of the water table
-excavated side wall area below the inlet - -minimum effective absorption area in any
seepage pit
-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
-1/3 total capacity - -minimum secondary compartment capacity of any septic tank
-1 cu.m. - -minimum capacity of the secondary compartment of a septic tank.
-2/3 total capacity - -minimum inlet compartment capacity of any septic tank
-2 cu.m. - -minimum liquid capacity of inlet compartment of any septic tank
-6 cu.m. - -minimum septic tank capacity where minimum required length is 1.5m
-0.6m to 1.8m - -liquid depth range for septic tanks
-0.9m Width by 1.5m Length - -minimum width and length of septic tank
Exam Q’s and A’s
Location
Soil Porosity
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
-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
-150% - -tubular area of each leaching bed (when permitted in lieu of trenches) compared
to tubular requirements of trenches
-1.5m - -No excavation for a leach line or leach bed shall extend within ___ of the water
table
-3m - -No excavation for seepage pits shall extend within ___ of the water table
-excavated side wall area below the inlet - -minimum effective absorption area in any
seepage pit
-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
-1/3 total capacity - -minimum secondary compartment capacity of any septic tank
-1 cu.m. - -minimum capacity of the secondary compartment of a septic tank.
-2/3 total capacity - -minimum inlet compartment capacity of any septic tank
-2 cu.m. - -minimum liquid capacity of inlet compartment of any septic tank
-6 cu.m. - -minimum septic tank capacity where minimum required length is 1.5m
-0.6m to 1.8m - -liquid depth range for septic tanks
-0.9m Width by 1.5m Length - -minimum width and length of septic tank
