E&S Certification Questions
A concrete washout structure - ANS-*Must have at least 4" of freeboard at all times
*May be prefabricated or constructed on site
*Must be lined with impervious material
*Is typically 10'x10'x3'
A filter bag must be replaced when it - ANS-*Becomes full of sediment
*The geotextile becomes clogged
*The bag develops a rip or tear
A grading unit as it pertains to Maryland regulations is - ANS-20 acres
A NOI (Notice of Intent) must be submitted and coverage obtained under the NPDES General
Permit for Construction Activity for any construction site that disturbs: - ANS-5 acres or more
A perimeter dike/swale -1 (PDS-1) can be used as a clear water diversion when - ANS-a PDS-1
is never allowed as a clear water diversion
A primary goal of ESD is to - ANS-mimic natural runoff conditions when developing a site
A stabilized construction entrance - ANS-uses nonwoven geotextile underneath the
stone/recycled concrete
A temporary earth dike is differentiated from a temporary swale on a plan sheet by - ANS-A dike
is shown with a single arrow and a swale with a double arrow as its standard symbol
A temporary sediment basin or trap is designed to - ANS-Detain sediment-laden water allowing
sediment to settle out prior to discharge of runoff
A temporary sump pit is designed for durations ____ or less - ANS-3 months
Accumulated sediment must be removed from behind a temporary stone outlet structure when
the sediment deposition is within ____ of weir crest - ANS-6 inches
All erosion and sediment control devices must be - ANS-*Built according to approved design
*Stabilized
*Inspected and approved
Although 2/3's of earth's surface is water, what percentage is fresh water? - ANS-3%
, An inlet protection type not included in MDE's 2011 Handbook may be used if - ANS-It is shown
on the approved erosion and sediment control plan
An ST-III requires ____ cu ft of storage per acre of drainage area - ANS-5400
An untrenched filter log requires staking every - ANS-4 feet
Areas of Special Concern with respect to an erosion and sediment control plan include: -
ANS-*Wetlands and streams
*Highly erodible soils
*Steep slopes
At a minimum, a clear water dike or swale must be stabilized with - ANS-Soil stabilization
matting
Benching is required on a slope steeper than 2:1 if its height is greater than - ANS-20 feet
Clean water provides: - ANS-*Critical wildlife habitat
*an important part of Maryland's economy
*enhances recreational opportunities
Cleanout of a sediment trap/basin is required when sediment accumulation has reached ____ of
its total storage volume - ANS-1/4 or 25%
Compliance with the NPDES General Permit for Stormwater Associated with Construction
Activity (which an Notice of Intent or NOI is submitted) requires the inspection and
documentation of erosion and sediment controls: - ANS-Weekly and the next day after a rain
event that produces runoff
Depending on the type, the allowable drainage area to a storm drain inlet protection practice
may be between - ANS-1/4 to 1 1/2 acres
Erosion and Sediment controls are installed to - ANS-*Reduce sediment yields
*Provide filtration of runoff prior to discharge
*Decrease the volume and velocity of runoff
*Provide settlement and containment of sediments
Following initial soil disturbance or re-disturbance, permanent or temporary stabilization must be
completed within ____ calendar days for all perimeter dikes, swales, ditches, perimeter slopes,
and all slopes steeper than 3 to 1; and ____ calendar days as for all other disturbed or graded
areas on the project site not under active grading - ANS-3 , 7
For super silt fence, the wire fencing must be at least ____ gauge - ANS-9
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