Erosion and Sediment Control
Certification Exam Solved Correctly To
Score A+
The following type of material is used in the installation of silt fence and super silt fence:
a. woven slit film
b. woven monofilament
c. nonwoven
d. none of the above CORRECT ANSWERS a. woven slit film
Per the ASTM D-4355 test method, all geotextiles used in MD for erosion and sediment
control must have an ultraviolet retention strength rating of at least:
a. 70%
b. 95%
c. 60%
d. 50% CORRECT ANSWERS a. 70%
In determining a stone classification size, the stone must be a well graded mixture
where 50% of the pieces by weight are below the weight of the midsize indicated as
d50.
a. true
b. false CORRECT ANSWERS a. true
A local jurisdiction may have stricter requirements than the State for material
specifications.
a. true
b. false CORRECT ANSWERS a. true
The minimum gauge wire for use in gabion baskets is:
a. 7
b. 12
c. 15
d. 11 CORRECT ANSWERS d. 11
The best way to prevent erosion is:
a. double up the silt fence
b. install a good working sediment trap
c. minimize the disturbed area and quickly re-establish vegetative cover
d. schedule construction when rain is not forecasted CORRECT ANSWERS c. minimize
the disturbed area and quickly re-establish vegetative cover
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 3:1; and __________ calendar
days for all other disturbed or graded areas on the project site not under active grading.
a. 1, 2
b. 3, 7
c. 7, 14
d. 14, 21 CORRECT ANSWERS b. 3, 7
Adequate vegetative cover requires __________ percent ground cover.
a. 50
b. 80
c. 95
d. 100 CORRECT ANSWERS c. 95
An earth dike must be stabilized within 3 days of installation.
a. true
b. false CORRECT ANSWERS a. true
A stabilized construction entrance:
a. is made up of Class I riprap or equivalent recycled concrete
b. uses nonwoven geotextile underneath the stone/recycled concrete
c. should slope toward the exterior of the site so runoff from SCE flows offsite
d. none of the above CORRECT ANSWERS b. uses nonwoven geotextile underneath
the stone/recycled concrete
Other than for a single-family home the minimum length of a stabilized construction
entrance is:
a. 25 feet
b. 30 feet
c. 50 feet
d. 60 feet CORRECT ANSWERS c. 50 feet
The discharge from a SCE washrack should not be directed toward silt fence.
a. true
b. false CORRECT ANSWERS a. true
Benching is required on a slope steeper than 2:1 if its height is greater than:
a. 20 feet
b. 30 feet
c. 45 feet
d. 50 feet CORRECT ANSWERS a. 20 feet
The primary purpose of benching or serrated slopes is to:
a. provide additional area for landscaping
b. break up the surface flow of runoff on long steep slopes
c. provide a level area for wildlife crossing
Certification Exam Solved Correctly To
Score A+
The following type of material is used in the installation of silt fence and super silt fence:
a. woven slit film
b. woven monofilament
c. nonwoven
d. none of the above CORRECT ANSWERS a. woven slit film
Per the ASTM D-4355 test method, all geotextiles used in MD for erosion and sediment
control must have an ultraviolet retention strength rating of at least:
a. 70%
b. 95%
c. 60%
d. 50% CORRECT ANSWERS a. 70%
In determining a stone classification size, the stone must be a well graded mixture
where 50% of the pieces by weight are below the weight of the midsize indicated as
d50.
a. true
b. false CORRECT ANSWERS a. true
A local jurisdiction may have stricter requirements than the State for material
specifications.
a. true
b. false CORRECT ANSWERS a. true
The minimum gauge wire for use in gabion baskets is:
a. 7
b. 12
c. 15
d. 11 CORRECT ANSWERS d. 11
The best way to prevent erosion is:
a. double up the silt fence
b. install a good working sediment trap
c. minimize the disturbed area and quickly re-establish vegetative cover
d. schedule construction when rain is not forecasted CORRECT ANSWERS c. minimize
the disturbed area and quickly re-establish vegetative cover
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 3:1; and __________ calendar
days for all other disturbed or graded areas on the project site not under active grading.
a. 1, 2
b. 3, 7
c. 7, 14
d. 14, 21 CORRECT ANSWERS b. 3, 7
Adequate vegetative cover requires __________ percent ground cover.
a. 50
b. 80
c. 95
d. 100 CORRECT ANSWERS c. 95
An earth dike must be stabilized within 3 days of installation.
a. true
b. false CORRECT ANSWERS a. true
A stabilized construction entrance:
a. is made up of Class I riprap or equivalent recycled concrete
b. uses nonwoven geotextile underneath the stone/recycled concrete
c. should slope toward the exterior of the site so runoff from SCE flows offsite
d. none of the above CORRECT ANSWERS b. uses nonwoven geotextile underneath
the stone/recycled concrete
Other than for a single-family home the minimum length of a stabilized construction
entrance is:
a. 25 feet
b. 30 feet
c. 50 feet
d. 60 feet CORRECT ANSWERS c. 50 feet
The discharge from a SCE washrack should not be directed toward silt fence.
a. true
b. false CORRECT ANSWERS a. true
Benching is required on a slope steeper than 2:1 if its height is greater than:
a. 20 feet
b. 30 feet
c. 45 feet
d. 50 feet CORRECT ANSWERS a. 20 feet
The primary purpose of benching or serrated slopes is to:
a. provide additional area for landscaping
b. break up the surface flow of runoff on long steep slopes
c. provide a level area for wildlife crossing
