Designated Representative OSSF (Latest
Update ) Questions with
Correct Answers {Grade A} 100% Verified
A site evaluation must include: - correct answer - Soil analysis
- Groundwater evaluation
- Topography
- Flood hazard
- Separation requirements
What slopes are considered suitable? - correct answer Less than 30%
How can surface water be diverted from an OSSF? - correct answer Terraces, berms,
or swales
What is the best slope for surface drainage? - correct answer 2-6%
Why is vegetation important? - correct answer - Helps to breakdown and remove
nitrogen
,- Prevents erosion
- Roots open channels in soil matrix for water to follow
- Evapotranspiration
Zone of aeration: - correct answer The area where the pores of soil are partially filled
with water
Zone of saturation: - correct answer The area where the pores of soil are completely
filled with water - this is the zone of well water
Aquifers - correct answer Portions of the saturation zone that produce an abundance
of water. Can be found in unconsolidated rock, fractured rock, sandstone beds, open
caverns in limestone
Regions with 40 systems per square mile have a higher potential for what? - correct
answer Groundwater contamination
,The Edwards Aquifer is a special class of aquifer called: - correct answer Karst - very
productive aquifer formed when water dissolves limestone and makes existing
fractures larger
Special rules considering systems in the Edwards Aquifer Recharge Zone are: -
correct answer No tanks within 50', no soil absorption systems within 150'
The four major components of soil - correct answer Inorganic matter, organic matter,
water, air
5 major soil-forming factors - correct answer parent materials, climate, biota,
topography, time
Soil permeability (hydraulic conductivity) - correct answer the ability of soil to
transport water through a soil under either saturated or unsaturated conditions
, Why is aeration important? - correct answer achieves maximum decomposition of
organics and destruction of harmful bacteria and viruses. Encourages aerobic
microflora to grow
Soil profile - correct answer All the vertical layers or horizons that make up a soil in a
particular place
major horizons of soil - correct answer A - surface soil containing decomposed
organic mater, darker color
B - subsoil containing deposits of clay, iron, aluminum, and humus creating blocky
structure, redder or browner colors
C - substratum (parent material) containing minerals and parent material, is little
affected by soil forming process.
Soil materials greater than 2mm - correct answer Gravel
Sandy soil with 30% or more gravel - correct answer Class Ia soil (unsuitable)
Update ) Questions with
Correct Answers {Grade A} 100% Verified
A site evaluation must include: - correct answer - Soil analysis
- Groundwater evaluation
- Topography
- Flood hazard
- Separation requirements
What slopes are considered suitable? - correct answer Less than 30%
How can surface water be diverted from an OSSF? - correct answer Terraces, berms,
or swales
What is the best slope for surface drainage? - correct answer 2-6%
Why is vegetation important? - correct answer - Helps to breakdown and remove
nitrogen
,- Prevents erosion
- Roots open channels in soil matrix for water to follow
- Evapotranspiration
Zone of aeration: - correct answer The area where the pores of soil are partially filled
with water
Zone of saturation: - correct answer The area where the pores of soil are completely
filled with water - this is the zone of well water
Aquifers - correct answer Portions of the saturation zone that produce an abundance
of water. Can be found in unconsolidated rock, fractured rock, sandstone beds, open
caverns in limestone
Regions with 40 systems per square mile have a higher potential for what? - correct
answer Groundwater contamination
,The Edwards Aquifer is a special class of aquifer called: - correct answer Karst - very
productive aquifer formed when water dissolves limestone and makes existing
fractures larger
Special rules considering systems in the Edwards Aquifer Recharge Zone are: -
correct answer No tanks within 50', no soil absorption systems within 150'
The four major components of soil - correct answer Inorganic matter, organic matter,
water, air
5 major soil-forming factors - correct answer parent materials, climate, biota,
topography, time
Soil permeability (hydraulic conductivity) - correct answer the ability of soil to
transport water through a soil under either saturated or unsaturated conditions
, Why is aeration important? - correct answer achieves maximum decomposition of
organics and destruction of harmful bacteria and viruses. Encourages aerobic
microflora to grow
Soil profile - correct answer All the vertical layers or horizons that make up a soil in a
particular place
major horizons of soil - correct answer A - surface soil containing decomposed
organic mater, darker color
B - subsoil containing deposits of clay, iron, aluminum, and humus creating blocky
structure, redder or browner colors
C - substratum (parent material) containing minerals and parent material, is little
affected by soil forming process.
Soil materials greater than 2mm - correct answer Gravel
Sandy soil with 30% or more gravel - correct answer Class Ia soil (unsuitable)
