Erosion and Sediment Control Certification || Questions and
100% Verified Answers.
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
d. none of the above correct answers b. break up the surface flow of runoff on long steep slopes
Temporary stabilization is not required during the winter.
a. true
b. false correct answers b. false
Incremental stabilization should occur for every __________ feet of cut or fill.
100% Verified Answers.
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
d. none of the above correct answers b. break up the surface flow of runoff on long steep slopes
Temporary stabilization is not required during the winter.
a. true
b. false correct answers b. false
Incremental stabilization should occur for every __________ feet of cut or fill.
