NPDES CLASS QUESTIONS AND
ANSWERS
Erosion`-`ans-
✔✔is`the`process`by`which`the`land`surface`is`worn`away`by`the`action`of`wind,`water,`an
d`gravity.
Sedimentation`-`ans-✔✔is`the`settling`out`of`soil`particles`transported`by`water`and`wind.
Soil`erosion`can`be`classified`as`2`types.`What`are`they?`-`ans-✔✔Wind`and`Water.
What`are`the`two`sources`of`Soil`erosion.`-`ans-✔✔Natural`and`Manmade
Water`erosion`can`be`classified`as`two`type`of`erosions.`What`are`they?`-`ans-
✔✔Overland`and`Stream/Channel`erosion.
Four`process`of`overland`erosion`are?`-`ans-✔✔Splash,`sheet,`rill,`and`gully`erosion.
Four`principle`factors`influencing`soil`erosion`are?`-`ans-
✔✔Soil`characteristics,`vegetative`cover,`topography,`and`climate.
List`three`physical`effect`of`erosion`and`sedimentation:`-`ans-
✔✔Increased`flooding`reduced`hydraulic`capacity`in`rivers,`and`streams;`increased`maint
enance`of`stormwater`systems.;`increased`water`treatments`cost;`and`decreased`recreati
onal`value.
List`three`biological`effect`of`erosion`and`sedimentation:`-`ans-
✔✔Reduced`light`for`aquatic`plants;`clogs`fish`gills;`impairs`spawning;`disrupts`food`chain
;`blankets`bottom,`suppresses`aquatic`life;`and`disrupts`ecosystem.
Planning`the`development`to`fit`the`terrain`using`the`particular:`-`ans-
✔✔Topography;`soils;`drainage`patterns;`natural`vegetation`of`the`site;`and`minimize`the`
extent`of`the`area`exposed`at`one`time`and`the`duration`of`exposure.
Perimeter`Control`Practices`-`ans-
✔✔What`you`apply`to`protect`the`disturbed`area`from`off-site`runoff`and`to`protect`off-
site`areas`from`sediment`damage.
, Erosion`Control`Practices`-`ans-✔✔What`you`apply`to`prevent`excessive`on-site`damage.
Keep`runoff`velocities`_____`and`_______`runoff`on`the`site`-`ans-✔✔Low`and`retain
When`do`you`stabilize`disturbed`areas`after`final`grading`to`prevent`raindrop`impacts`from
`causing`erosion.`-`ans-✔✔Immediately
Implement`a`thorough`_____`and`_____(inspection)`program`as`required`in`the`Construct
ion`Generic`Permit`(CGP).`-`ans-✔✔maintenance`and`follow`up
Soil`particles`smaller`than`0.002`mm`are`classified`as`____`and`along`with`____`are`the`t
wo`soil`types`that`cause`the`most`erosion/turbidity`problems`in`Florida`and`the`World.`-
`ans-✔✔clay`and`muck
Soils`in`the`Type`A`hydrologic`group`have`____`infiltration`rates`and`____`runoff`potential`
even`when`thoroughly`wetted.`-`ans-✔✔high`and`low
Soils`in`the`Type`D`hydrologic`group`have`very`____`infiltration`rates`and`____`runoff`pote
ntial`when`thoroughly`wetted.`-`ans-✔✔low`and`high
What`is`the`rainfall`erosion`index?`-`ans-
✔✔The`rainfall`erosion`index`is`the`only`factor`in`the`Universal`Soil`Loss`Equation`which`i
s`beyond`the`developer's`control.
What`are`the`factors`that`can`most`easily`be`manipulated`by`the`developer?`-`ans-
✔✔length`&`gradient,`and`cover`factor
The`RUSLE`is`used`on`our`construction`sites`to`predict______`-`ans-✔✔Soil`Loss
Stabilize`disturbed`lands`immediately`to`save`what?`-`ans-✔✔Money
Who`can`you`contact`for`a`soil`survey`information?
`FDOT,`FDEP,`Water`Management`District,`Mayor's`Office,`or`NRCS.`-`ans-✔✔NRCS
What`are`the`five`soil`forming`factors?`-`ans-
✔✔Climate,`topography,`organisms,`parent`material,`and`time.
Waste`disposal`is`a`problem`for`the`individual`workers`and`some`subcontractors,`but`it's`n
o`big`deal`(True`/`False).`-`ans-✔✔False
Truck`washing`should`be`done`in`a`designated`area,`not`near`the`perimeter`controls.`(Tru
e`/`False).`-`ans-✔✔True
ANSWERS
Erosion`-`ans-
✔✔is`the`process`by`which`the`land`surface`is`worn`away`by`the`action`of`wind,`water,`an
d`gravity.
Sedimentation`-`ans-✔✔is`the`settling`out`of`soil`particles`transported`by`water`and`wind.
Soil`erosion`can`be`classified`as`2`types.`What`are`they?`-`ans-✔✔Wind`and`Water.
What`are`the`two`sources`of`Soil`erosion.`-`ans-✔✔Natural`and`Manmade
Water`erosion`can`be`classified`as`two`type`of`erosions.`What`are`they?`-`ans-
✔✔Overland`and`Stream/Channel`erosion.
Four`process`of`overland`erosion`are?`-`ans-✔✔Splash,`sheet,`rill,`and`gully`erosion.
Four`principle`factors`influencing`soil`erosion`are?`-`ans-
✔✔Soil`characteristics,`vegetative`cover,`topography,`and`climate.
List`three`physical`effect`of`erosion`and`sedimentation:`-`ans-
✔✔Increased`flooding`reduced`hydraulic`capacity`in`rivers,`and`streams;`increased`maint
enance`of`stormwater`systems.;`increased`water`treatments`cost;`and`decreased`recreati
onal`value.
List`three`biological`effect`of`erosion`and`sedimentation:`-`ans-
✔✔Reduced`light`for`aquatic`plants;`clogs`fish`gills;`impairs`spawning;`disrupts`food`chain
;`blankets`bottom,`suppresses`aquatic`life;`and`disrupts`ecosystem.
Planning`the`development`to`fit`the`terrain`using`the`particular:`-`ans-
✔✔Topography;`soils;`drainage`patterns;`natural`vegetation`of`the`site;`and`minimize`the`
extent`of`the`area`exposed`at`one`time`and`the`duration`of`exposure.
Perimeter`Control`Practices`-`ans-
✔✔What`you`apply`to`protect`the`disturbed`area`from`off-site`runoff`and`to`protect`off-
site`areas`from`sediment`damage.
, Erosion`Control`Practices`-`ans-✔✔What`you`apply`to`prevent`excessive`on-site`damage.
Keep`runoff`velocities`_____`and`_______`runoff`on`the`site`-`ans-✔✔Low`and`retain
When`do`you`stabilize`disturbed`areas`after`final`grading`to`prevent`raindrop`impacts`from
`causing`erosion.`-`ans-✔✔Immediately
Implement`a`thorough`_____`and`_____(inspection)`program`as`required`in`the`Construct
ion`Generic`Permit`(CGP).`-`ans-✔✔maintenance`and`follow`up
Soil`particles`smaller`than`0.002`mm`are`classified`as`____`and`along`with`____`are`the`t
wo`soil`types`that`cause`the`most`erosion/turbidity`problems`in`Florida`and`the`World.`-
`ans-✔✔clay`and`muck
Soils`in`the`Type`A`hydrologic`group`have`____`infiltration`rates`and`____`runoff`potential`
even`when`thoroughly`wetted.`-`ans-✔✔high`and`low
Soils`in`the`Type`D`hydrologic`group`have`very`____`infiltration`rates`and`____`runoff`pote
ntial`when`thoroughly`wetted.`-`ans-✔✔low`and`high
What`is`the`rainfall`erosion`index?`-`ans-
✔✔The`rainfall`erosion`index`is`the`only`factor`in`the`Universal`Soil`Loss`Equation`which`i
s`beyond`the`developer's`control.
What`are`the`factors`that`can`most`easily`be`manipulated`by`the`developer?`-`ans-
✔✔length`&`gradient,`and`cover`factor
The`RUSLE`is`used`on`our`construction`sites`to`predict______`-`ans-✔✔Soil`Loss
Stabilize`disturbed`lands`immediately`to`save`what?`-`ans-✔✔Money
Who`can`you`contact`for`a`soil`survey`information?
`FDOT,`FDEP,`Water`Management`District,`Mayor's`Office,`or`NRCS.`-`ans-✔✔NRCS
What`are`the`five`soil`forming`factors?`-`ans-
✔✔Climate,`topography,`organisms,`parent`material,`and`time.
Waste`disposal`is`a`problem`for`the`individual`workers`and`some`subcontractors,`but`it's`n
o`big`deal`(True`/`False).`-`ans-✔✔False
Truck`washing`should`be`done`in`a`designated`area,`not`near`the`perimeter`controls.`(Tru
e`/`False).`-`ans-✔✔True
