DEQ ESC Specifications
Comprehensive Questions
(Frequently Tested) with
Verified Answers
What is the minimum height for plastic and metal SAF? - Answer: 5, 6
What kind of stone is used for a construction entrance? - Answer: VDOT #1
For Construction Road Stabilization, what is the minimum width for one-way and two-way traffic? -
Answer: 14, 20
What is the type of stone and depth required for construction road stabilization? - Answer: 6" of VDOT
#1 coarse aggregate
Straw bales decrease the velocity of - Answer: sheet flow
Straw bales should not be used for - Answer: ditches or swales
How many stakes per bale? - Answer: 2
Silt fence should be placed __ to __ feet beyond the base of a slope __% or greater - Answer: 5, 7, 5
Max distance between stakes when silt fence does not have wire and when it does have wire - Answer:
6, 10
Height range for silt fence - Answer: 16" to 34"
, Where joints overlap in silt fence, a minimum of __of fabric shall be wrapped around the stake from
each side - Answer: 6"
How much fabric should be in a silt fence trench? - Answer: 8" (4"*4" trench)
Max drainage area for the storm drain inlet protection - Answer: 1 acre
For silt fence drop inlet protection, - Answer: use 2"*4" stakes, space 3' apart and entrench fabric 12 "
For gravel and wire mesh drop inlet - Answer: 1/2" wire mesh over inlet, minimum 1' beyond each side
of inlet, depth of stone to be 12" and extend 18" on all sides
Block and gravel inlets - Answer: 4", 8", or 12" blocks placed on sides, minimum 12" high, maximum 24"
high, 1/2" wire mesh between concrete blocks and #3, #357, #5 stone
Gravel curb inlet protection - Answer: 1/2" wire mesh (extend 12" over top and 12" in gutter pan), pile
stone against wire to cover inlet opening
Wooden weir curb inlet protection - Answer: attach wire mesh to 2"*4" wooden weir (30" deep, inlet
opening plus 4'), Use 2"*4" anchors, place 2"*4" across inlet and nail together
Block and gravel curb inlet protection - Answer: 2 concrete blocks placed on sides against the curb at
either side of the inlet opening, 2"*4" placed flat through outer holes of each spacer block to keep front
blocks
Silt Fence culvert inlet protection has an expected life span of - Answer: 3 months
For silt fence culvert inlet protection there should not be more than - Answer: 1 acre of drainage
The silt fence when used in culvert inlet protection should be placed __ feet away from culvert opening -
Answer: 6'
Comprehensive Questions
(Frequently Tested) with
Verified Answers
What is the minimum height for plastic and metal SAF? - Answer: 5, 6
What kind of stone is used for a construction entrance? - Answer: VDOT #1
For Construction Road Stabilization, what is the minimum width for one-way and two-way traffic? -
Answer: 14, 20
What is the type of stone and depth required for construction road stabilization? - Answer: 6" of VDOT
#1 coarse aggregate
Straw bales decrease the velocity of - Answer: sheet flow
Straw bales should not be used for - Answer: ditches or swales
How many stakes per bale? - Answer: 2
Silt fence should be placed __ to __ feet beyond the base of a slope __% or greater - Answer: 5, 7, 5
Max distance between stakes when silt fence does not have wire and when it does have wire - Answer:
6, 10
Height range for silt fence - Answer: 16" to 34"
, Where joints overlap in silt fence, a minimum of __of fabric shall be wrapped around the stake from
each side - Answer: 6"
How much fabric should be in a silt fence trench? - Answer: 8" (4"*4" trench)
Max drainage area for the storm drain inlet protection - Answer: 1 acre
For silt fence drop inlet protection, - Answer: use 2"*4" stakes, space 3' apart and entrench fabric 12 "
For gravel and wire mesh drop inlet - Answer: 1/2" wire mesh over inlet, minimum 1' beyond each side
of inlet, depth of stone to be 12" and extend 18" on all sides
Block and gravel inlets - Answer: 4", 8", or 12" blocks placed on sides, minimum 12" high, maximum 24"
high, 1/2" wire mesh between concrete blocks and #3, #357, #5 stone
Gravel curb inlet protection - Answer: 1/2" wire mesh (extend 12" over top and 12" in gutter pan), pile
stone against wire to cover inlet opening
Wooden weir curb inlet protection - Answer: attach wire mesh to 2"*4" wooden weir (30" deep, inlet
opening plus 4'), Use 2"*4" anchors, place 2"*4" across inlet and nail together
Block and gravel curb inlet protection - Answer: 2 concrete blocks placed on sides against the curb at
either side of the inlet opening, 2"*4" placed flat through outer holes of each spacer block to keep front
blocks
Silt Fence culvert inlet protection has an expected life span of - Answer: 3 months
For silt fence culvert inlet protection there should not be more than - Answer: 1 acre of drainage
The silt fence when used in culvert inlet protection should be placed __ feet away from culvert opening -
Answer: 6'
