Erosion and Sediment Control
Certification questions n answers
rated A+
a. woven slit film - correct answer ✔✔ 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
a. 70% - correct answer ✔✔ 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%
a. true - correct answer ✔✔ 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
a. true - correct answer ✔✔ A local jurisdiction may have stricter requirements than the State
for material specifications.
,a. true
b. false
d. 11 - correct answer ✔✔ The minimum gauge wire for use in gabion baskets is:
a. 7
b. 12
c. 15
d. 11
c. minimize the disturbed area and quickly re-establish vegetative cover - correct answer ✔✔
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
b. 3, 7 - correct answer ✔✔ 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
c. 95 - correct answer ✔✔ Adequate vegetative cover requires __________ percent ground
cover.
, a. 50
b. 80
c. 95
d. 100
a. true - correct answer ✔✔ An earth dike must be stabilized within 3 days of installation.
a. true
b. false
b. uses nonwoven geotextile underneath the stone/recycled concrete - correct answer ✔✔ 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
c. 50 feet - correct answer ✔✔ 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
a. true - correct answer ✔✔ The discharge from a SCE washrack should not be directed toward
silt fence.
a. true
b. false
Certification questions n answers
rated A+
a. woven slit film - correct answer ✔✔ 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
a. 70% - correct answer ✔✔ 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%
a. true - correct answer ✔✔ 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
a. true - correct answer ✔✔ A local jurisdiction may have stricter requirements than the State
for material specifications.
,a. true
b. false
d. 11 - correct answer ✔✔ The minimum gauge wire for use in gabion baskets is:
a. 7
b. 12
c. 15
d. 11
c. minimize the disturbed area and quickly re-establish vegetative cover - correct answer ✔✔
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
b. 3, 7 - correct answer ✔✔ 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
c. 95 - correct answer ✔✔ Adequate vegetative cover requires __________ percent ground
cover.
, a. 50
b. 80
c. 95
d. 100
a. true - correct answer ✔✔ An earth dike must be stabilized within 3 days of installation.
a. true
b. false
b. uses nonwoven geotextile underneath the stone/recycled concrete - correct answer ✔✔ 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
c. 50 feet - correct answer ✔✔ 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
a. true - correct answer ✔✔ The discharge from a SCE washrack should not be directed toward
silt fence.
a. true
b. false
