EROSION AND SEDIMENT CONTROL
INSPECTOR TEST PAPER FULL SOLUTION
QUESTIONS AND CORRECT ANSWERS
GRADED A+
●● 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%
Answer: 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
Answer: a. true
●● A local jurisdiction may have stricter requirements than the State for
material specifications.
,a. true
b. false
Answer: a. true
●● The minimum gauge wire for use in gabion baskets is:
a. 7
b. 12
c. 15
d. 11
Answer: 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
Answer: 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
Answer: b. 3, 7
●● Adequate vegetative cover requires __________ percent ground
cover.
a. 50
b. 80
c. 95
d. 100
Answer: c. 95
●● An earth dike must be stabilized within 3 days of installation.
a. true
b. false
Answer: 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
Answer: 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
Answer: c. 50 feet
●● The discharge from a SCE washrack should not be directed toward
silt fence.
a. true
b. false
Answer: a. true
●● Benching is required on a slope steeper than 2:1 if its height is
greater than:
INSPECTOR TEST PAPER FULL SOLUTION
QUESTIONS AND CORRECT ANSWERS
GRADED A+
●● 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%
Answer: 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
Answer: a. true
●● A local jurisdiction may have stricter requirements than the State for
material specifications.
,a. true
b. false
Answer: a. true
●● The minimum gauge wire for use in gabion baskets is:
a. 7
b. 12
c. 15
d. 11
Answer: 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
Answer: 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
Answer: b. 3, 7
●● Adequate vegetative cover requires __________ percent ground
cover.
a. 50
b. 80
c. 95
d. 100
Answer: c. 95
●● An earth dike must be stabilized within 3 days of installation.
a. true
b. false
Answer: 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
Answer: 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
Answer: c. 50 feet
●● The discharge from a SCE washrack should not be directed toward
silt fence.
a. true
b. false
Answer: a. true
●● Benching is required on a slope steeper than 2:1 if its height is
greater than:
