Georgia Mound and Area Fill Exam
All perforated pipe used for gravity flow carriage and 1,500lb
distribution of effluent within lateral trenches, mounds,
etc. shall meet lb crush strength.
ASTM - F810 is for what type of piping? Rigid
ASTM - F667 is for what type of piping? Corrugated semi-rigid piping
What psi must pipe used for pressure carriage and At least 160 psi PVC construction
distribution of effluent be?
What three things make of the cross section of a 1. Septic Tank 2. Dosing Chamber 3. The Mound
Wisconsin Mound System?
What is the purpose of the septic tank in a mound To remove most of the settleable solids and is a place for liquefaction of the more
system? easily biodegradable solids
What must the dosing tank have? A pump or siphon
What is the purpose of the dosing tank in a mound To pressurize a distribution network of small diameter pipe with small
system? perforations and distributes the septic tank effluent uniformly along the length
of the mound
What is the purpose of the mound in a mound system? To accept septic tank effluent, and along with the native soil, treat, and purify the
wastewater to acceptable standards
What four layers does a mound consist of? Layer of suitable sand, aggregate, distribution system, and soil cover
, It is common to see Wisconsin Mound Systems in 25,000 gpd
excess of ?
What is the sizing and configuration of soil absorption How the effluent moves away from the system and the rate at which it moves away
systems based on? from the system
What does the designer of the mound system predict type The prediction is made based on soil and site information obtained during site
of movement and rate of movement based on? evaluation
The more restrictive the site, the __________ and____________the Narrower and Longer
soil absorption system must be.
What is the typical suitable depth for unsaturated soil? Varies among codes but is usually between 1 and 4 ft
High ground water table, including seasonally perched 10 inches
water table should be greater than____beneath
the
ground surface.
How is the high water table determined? By the direct observation and/or interpretation of soil mottling
It is impossible to detect____________in black surface Soil mottles
horizons, it is difficult to determine the exact location of
seasonal saturation during wet periods.
What should bedrock be classified as? Crevice, Non-crevice, or Non-Crevice impermeable
How many feet is suggested for the crevice bedrock if it is 2 feet
assumed that very little treatment takes place in the
crevice bedrock?
What does the natural soil aid as? Treatment of the effluent
What does the extra foot of natural soil act as? A factor of safety as the first water table that the effluent will contact may be
permanent and potable
Potable water is usually separated from seasonal Shallower
water table: therefore depths are required for
the non-
crevice bedrock.
In the non-crevice, very slowly permeable or Horizontal
impermeable bedrock, the effluent flow will be?
In the semi-permeable sandstones, the flow will be both? Vertical and Horizontal
What is loading rates based on? Soil texture, structure, and consistence with the percolation test, if required, to
confirm morphological interpretations
Mound systems on steep slopes with slow permeable The possibility of toe seepage
soils should be narrow to reduce?
All perforated pipe used for gravity flow carriage and 1,500lb
distribution of effluent within lateral trenches, mounds,
etc. shall meet lb crush strength.
ASTM - F810 is for what type of piping? Rigid
ASTM - F667 is for what type of piping? Corrugated semi-rigid piping
What psi must pipe used for pressure carriage and At least 160 psi PVC construction
distribution of effluent be?
What three things make of the cross section of a 1. Septic Tank 2. Dosing Chamber 3. The Mound
Wisconsin Mound System?
What is the purpose of the septic tank in a mound To remove most of the settleable solids and is a place for liquefaction of the more
system? easily biodegradable solids
What must the dosing tank have? A pump or siphon
What is the purpose of the dosing tank in a mound To pressurize a distribution network of small diameter pipe with small
system? perforations and distributes the septic tank effluent uniformly along the length
of the mound
What is the purpose of the mound in a mound system? To accept septic tank effluent, and along with the native soil, treat, and purify the
wastewater to acceptable standards
What four layers does a mound consist of? Layer of suitable sand, aggregate, distribution system, and soil cover
, It is common to see Wisconsin Mound Systems in 25,000 gpd
excess of ?
What is the sizing and configuration of soil absorption How the effluent moves away from the system and the rate at which it moves away
systems based on? from the system
What does the designer of the mound system predict type The prediction is made based on soil and site information obtained during site
of movement and rate of movement based on? evaluation
The more restrictive the site, the __________ and____________the Narrower and Longer
soil absorption system must be.
What is the typical suitable depth for unsaturated soil? Varies among codes but is usually between 1 and 4 ft
High ground water table, including seasonally perched 10 inches
water table should be greater than____beneath
the
ground surface.
How is the high water table determined? By the direct observation and/or interpretation of soil mottling
It is impossible to detect____________in black surface Soil mottles
horizons, it is difficult to determine the exact location of
seasonal saturation during wet periods.
What should bedrock be classified as? Crevice, Non-crevice, or Non-Crevice impermeable
How many feet is suggested for the crevice bedrock if it is 2 feet
assumed that very little treatment takes place in the
crevice bedrock?
What does the natural soil aid as? Treatment of the effluent
What does the extra foot of natural soil act as? A factor of safety as the first water table that the effluent will contact may be
permanent and potable
Potable water is usually separated from seasonal Shallower
water table: therefore depths are required for
the non-
crevice bedrock.
In the non-crevice, very slowly permeable or Horizontal
impermeable bedrock, the effluent flow will be?
In the semi-permeable sandstones, the flow will be both? Vertical and Horizontal
What is loading rates based on? Soil texture, structure, and consistence with the percolation test, if required, to
confirm morphological interpretations
Mound systems on steep slopes with slow permeable The possibility of toe seepage
soils should be narrow to reduce?
