Cepsci Practice Exam Test 2024
Questions and Correct Answers
Rated A+
Polyacrylamide (pam) -answer-used as non toxic chemical temporary
tackifier for controlling soil erosion and as a flocculant to aid
sedimentation
3 types of pam -answer-dry/powder polyacrylamides
Liquid polyacrylamides
Solid/block polyacrylamides
Sediment control bmp's -answer-sediment tube ditch check
Stabilized construction entrance
Filter fabric inlet protection
Block and gravel inlet protection
Hardware fabric and stone inlet protection
Pre-fabricated inlet protection
Water surface withdrawal -answer-when discharging from sediment
basins, utilize outlet structures that only withdraw water from near the
waters surface within the basin, unless infeasible
What are the additional requirements for sediment basins -answer-
surface water withdrawal ( skimmers or stop log risers)
Clean out stake ( 1/2 of sediment storage volume)
Public safety addressed, (as applicable)
Safety fences and signs, vector control(mosquitoes)
,Sediment forebays (as applicable)
Porous baffles (as applicable)
3 row minimum/ may not use silt fence
Sediment forebay benefits -answer-reduce runoff velocities
Improve sediment trapping
Promotes sedimentation away from outlet structure
Ease of maintenance
Sediment forebay requiremnts -answer-install in all sediment basins
Sized based off of total sediment storage.
Earthen berms, riprap berms, and excavations.
Porous baffles requirements -answer-minimum of 3 row
Place between basins inlets and outlets
Do not use silt fence
Porous baffles beneifts -answer-reduce runoff velocities
Improve sediment trapping
Promotes sedimentation away from outlet structure
Skimmers shallow pit -answer-provides an area for sediment to
accumulate under skimmer
Skimmers rock pad -answer-prevents skimmer from becoming stuck in
accumulated sediment
Skimmer rope -answer-aids in maintenance of skimmer without having
to enter basin. Route rope through trash rack and attach to
embankment
, Sediment basin description -answer-structure designed to capture
sediment from storm water runoff before it leaves construction site and
basin dewatering achieved through riser and pipe leading to outlet on
downstream side of embankment.
Sediment basin installation -answer-basins should be constructed
before any grading takes place within drainage area.
Basins with earthen embankments should be outfitted with dewatering
pipe and riser set just above sediment removal cutoff level.
Multipurpose basin description -answer-permanent detention basins
designed for use as temporary sediment basins during construction
phase of project.
Sediment dam trap -answer-formed by excavating pond or by placing
earthen embankment across low area or drainage swale
Sediment dam trap outlet or spillway is -answer-constructed using
no.5 washed stone and class b riprap aggregate.
Sediment dam trap installation -answer-allow stone to extend
downstream past toe of embankment.
Upstream side of outlet should be lined with uniform 6 inch thick layer
of no.5 stone.
Mark sediment cleanout level of dam with stake at 1/2 sediment
storage volume.
Seed and mulch all disturbed areas.
Questions and Correct Answers
Rated A+
Polyacrylamide (pam) -answer-used as non toxic chemical temporary
tackifier for controlling soil erosion and as a flocculant to aid
sedimentation
3 types of pam -answer-dry/powder polyacrylamides
Liquid polyacrylamides
Solid/block polyacrylamides
Sediment control bmp's -answer-sediment tube ditch check
Stabilized construction entrance
Filter fabric inlet protection
Block and gravel inlet protection
Hardware fabric and stone inlet protection
Pre-fabricated inlet protection
Water surface withdrawal -answer-when discharging from sediment
basins, utilize outlet structures that only withdraw water from near the
waters surface within the basin, unless infeasible
What are the additional requirements for sediment basins -answer-
surface water withdrawal ( skimmers or stop log risers)
Clean out stake ( 1/2 of sediment storage volume)
Public safety addressed, (as applicable)
Safety fences and signs, vector control(mosquitoes)
,Sediment forebays (as applicable)
Porous baffles (as applicable)
3 row minimum/ may not use silt fence
Sediment forebay benefits -answer-reduce runoff velocities
Improve sediment trapping
Promotes sedimentation away from outlet structure
Ease of maintenance
Sediment forebay requiremnts -answer-install in all sediment basins
Sized based off of total sediment storage.
Earthen berms, riprap berms, and excavations.
Porous baffles requirements -answer-minimum of 3 row
Place between basins inlets and outlets
Do not use silt fence
Porous baffles beneifts -answer-reduce runoff velocities
Improve sediment trapping
Promotes sedimentation away from outlet structure
Skimmers shallow pit -answer-provides an area for sediment to
accumulate under skimmer
Skimmers rock pad -answer-prevents skimmer from becoming stuck in
accumulated sediment
Skimmer rope -answer-aids in maintenance of skimmer without having
to enter basin. Route rope through trash rack and attach to
embankment
, Sediment basin description -answer-structure designed to capture
sediment from storm water runoff before it leaves construction site and
basin dewatering achieved through riser and pipe leading to outlet on
downstream side of embankment.
Sediment basin installation -answer-basins should be constructed
before any grading takes place within drainage area.
Basins with earthen embankments should be outfitted with dewatering
pipe and riser set just above sediment removal cutoff level.
Multipurpose basin description -answer-permanent detention basins
designed for use as temporary sediment basins during construction
phase of project.
Sediment dam trap -answer-formed by excavating pond or by placing
earthen embankment across low area or drainage swale
Sediment dam trap outlet or spillway is -answer-constructed using
no.5 washed stone and class b riprap aggregate.
Sediment dam trap installation -answer-allow stone to extend
downstream past toe of embankment.
Upstream side of outlet should be lined with uniform 6 inch thick layer
of no.5 stone.
Mark sediment cleanout level of dam with stake at 1/2 sediment
storage volume.
Seed and mulch all disturbed areas.
