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Virginia ESC (Basic) > Virginia ESC Minimum Standards > Flashcards

Virginia ESC Minimum Standards Flashcards

1
Q

What is Minimum Standard 1?

A

Stabilization

Module 5 /Page 5

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2
Q

What is Minimum Standard 4?

A

First Step Measures

Module 5 /Page 8

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3
Q

What is Minimum Standard 10?

A

Inlet Protection

Module 5 /Page 10

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4
Q

What is Minimum Standard 17?

A

Vehicular Tracking and Construction Entrances

Module 5 /Page 21

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5
Q

What is Minimum Standard 19?

A

Stormwater Management in relation to Erosion and Sediment Control

(Module 5 /Page 23)

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6
Q

Minimum Standard 5 refers to Earthen Structure Stabilization. According to the Virginia Erosion and Sediment Control Handbook, when should stabilization measures be applied to earthen structures?

A

Immediately after installation

In this case, MS-5 overrules MS-1

(Module 5 /Page 9)

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7
Q

What are some structural control practices that would be considered earthen structures? (Note: There are 5)

A
  • Temporary Diversion Dike
  • Diversion
  • Temporary Sediment Trap
  • Temporary Sediment Basin
  • Stormwater Conveyance Channel

(Module 6 /Page 32-34)

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8
Q

Minimum Standard 8 refers to concentrated runoff. What does MS-8 try to ensure?

A

MS-8 wants to ensure concentrated runoff does not flow down cut or fill slopes unless it is contained within a channel, flume, or slope drain.

(Module 5 /Page 12)

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9
Q

What is the purpose of MS-11, outlet protection?

A
  • To prevent scour at Stormwater outlets
  • To minimize potential for downstream erosion by reducing velocity and energy of concentrated Stormwater flows

(Module 5 /Page 15)

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10
Q

What amount of stream crossings needed for construction in a six month period will warrant a temporary stream crossing based on MS-13?

A

2 times in a 6 month period will warrant a temporary stream crossing

(Module 5 /Page 17)

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11
Q

The state of Virginia has had the minimum standards for Erosion and Sediment Control in place since when?

A) 1970
B) 1980
C) 1990
D) 2000

A

C) 1990

Module 5 /Page 2

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12
Q

Minimum Standard 15 states that what should be stabilized immediately after work is completed?

A

The bed and bank of a watercourse

Module 5 /Page 19

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13
Q

When constructing an underground utility, MS-16 states only how many linear feet of trench may be opened at once?

A

500 linear feet

Module 5 /Page 20

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14
Q

When does MS-18, Control Removal, state that all temporary ESC measures should be removed by?

A

Within 30 days of final site stabilization

Module 5 /Page 22

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15
Q

When should soil stabilization be applied to denuded areas after final grade is reached based on MS-1?

A

Within 7 days after final grade is reached on any portion of the site

(Module 5 /Page 5)

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16
Q

If a site will be left dormant for more than one year, what action does MS-1 require?

A

Permanent seeding shall be applied

Module 5 /Page 5

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17
Q

Based on the project schedule, it is estimated that a portion of a site will see no work for three weeks. What action should be taken and why?

A

This section of the site should be temporarily seeded since it will be dormant for more than 14 days based on MS-1.

(Module 5 /Page 5)

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18
Q

Can sediment basins be considered first step measures based on MS-4?

A

Yes. If a practices will be needed to assure sediment does not leave the land disturbance area once site clearing, grading, and construction begins it should be installed as a first step.

(Module 5 /Page 8)

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19
Q

What is Minimum Standard 6?

A

Traps and Basins

(Module 5 /Page 10

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20
Q

When should a sediment trap be used and when should a sediment basin be used?

A

Sediment Traps are for drainage areas less than 3 acres, sediment basins should be used for drainage areas larger than 3 acres.

(Module 5 /Page 10

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21
Q

If a sediment trap will be functioning for a drainage area of 1 acre, how large should it be?

A

134 cubic yards

“The minimum storage capacity of a sediment trap shall be 134 cubic yards per acre of drainage areas”

(Module 5 /Page 10)

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22
Q

If a slope is found to be excessively eroding after 1 year of permanent stabilization, what does MS-7 recommend?

A

The slope shall be provided with additional slope stabilizing measures until the problem is corrected.

(Module 5 /Page 11)

23
Q

MS-9, Water Seeps, refers to aquifers or groundwater tables. Why might this be relevant on a construction project?

A

Because cut and fill operation may expose shall aquifers or groundwater tables, causing the slope to erode.

(Module 5 /Page 13)

24
Q

What are two negative impacts of sediment entering a storm sewer system?

A

Sediment can be transported to a receiving channel during high velocity storm events

Sediment may be deposited in pipes resulting in clogging during low velocity storm events

(Module 5 /Page 14)

25
Q

What is an acceptable grade for outlet protection?

A

Outlet protections MUST be constructed at grade of 0%

Module 5 /Page 15

26
Q

What material must be used to construct a causeway or cofferdam based on MS-12?

A

“Non-erodible materials”

Module 5 /Page 16

27
Q

MS-14, Other Watercourse Regulations, states what?

A

All applicable federal, state, and local requirements pertaining too working in or crossing live streams should be met.”

(Module 5 /Page 18)

28
Q

What is an approved method for cleaning paved roads based on MS-17 and when should it take place.

A

Sediment should be removed from paved surfaces by shoveling and sweeping at the end of each day.

(Module 5 /Page 21)

29
Q

Does cleaning of roadways at the end of every work day apply to small individual lots?

A

Yes. “This provision applies to individual development lots as well as larger land-disturbing activities.”

(Module 5 /Page 21)

30
Q

Is washing of streets permitted based on MS-17?

A

Yes, but only after shoveling and sweeping

Module 5 /Page 21

31
Q

To meet the requirements of MS-19 what 3 components of Stormwater discharge must be addressed?

A
  1. ) channel capacity
  2. ) channel stability
  3. ) peak flow rate

(Module 5 /Page 26)

32
Q

When MS-19 states channel stability must be addressed, what does that mean?

A

It means each structure or conduit has a permissible velocity, or the highest velocity allowed

(Module 5 /Page 26)

33
Q

When MS-19 states channel capacity must be addressed, what does that mean?

A

Channel capacity means the volume and duration

Module 5 /Page 26

34
Q

MS-19 requires natural channels to be analyzed based on what type of storm event?

A

The 2-year storm

Module 5 /Page 27

35
Q

When natural channels are analyzed due to MS-19, what needs to be verified?

A

The 2-year storm needs to be used to verify that stormwater will not overtop channel banks
nor cause erosion of the channel bed or banks.

(Module 5 /Page 27)

36
Q

When analyzing pipes to meet the requirements MS-19, what criteria needs to be met?

A

The 10-year storm must be contained within the pipe or system

(Module 5 /Page 27)

37
Q

Are the “Minimum Standards” found in the Erosion and Sediment Control Laws or Regulations?

A

Found in the Regulations

9VAC25-840-40

38
Q

What is a “cofferdam”?

A

A watertight temporary structure in a river, lake, etc., for keeping the water from an enclosed area that has been pumped dry so that bridge foundations, dams, etc, may be constructed.

(9VAC25-840-10 Definitions)

39
Q

What is a “dike”?

A

An earthen embankment constructed to confine or control water, especially one built along the banks of a river to prevent overflow of lowlands; levee

(9VAC25-840-10 Definitions)

40
Q

What is an “energy dissipator”?

A

A non-erodible structure which reduces the velocity of concentrated flow to reduce its erosive effects.

(9VAC25-840-10 Definitions)

41
Q

What is a “flume”?

A

A constructed device lined with erosive-resistant materials intended to convey water on steep grades.

(9VAC25-840-10 Definitions)

42
Q

What is a “ten-year storm”?

A

A storm that is capable of producing rainfall expected to be equaled or exceeded on the average of once in 10 years.

(9VAC25-840-10 Definitions)

43
Q

What does “stabilized” mean?

A

Land that has been treated to withstand normal exposure to natural forces without incurring erosion damage

(9VAC25-840-10 Definitions)

44
Q

What design concepts need to be included so that stream restoration/relocation projects are not considered man-made channels?

A

“Natural Channel Design Concepts”

62.1-44.15:52 A

45
Q

What is “Stormwater detention”?

A

The process of temporarily impounding runoff and discharging it through a hydraulic outlet structure to a downstream conveyance system

(9VAC25-840-10 Definitions)

46
Q

What is a “live watercourse”?

A

A definite channel with bed and bank within which concentrated water flows continuously

(9VAC25-840-10 Definitions)

47
Q

What does “denuded” mean?

A

Land that has been physically disturbed and no longer supports vegetative cover.

(9VAC25-840-10 Definitions)

48
Q

What one thing are minimum standards 1, 2, 3, and 5 all focused on?

A

-Erosion control stabilization

Module 5 / Page 4

49
Q

What one thing are minimum standards 12, 13, 14, and 15 all focused on?

A

Water courses

Module 5 / Page 4

50
Q

What one thing are minimum standards 7, 8, and 9 all focused on?

A

Slope protection

Module 5 / Page 4

51
Q

What one thing are minimum standards 10 and 11 both focused on?

A

Channels, culverts, and outlets

Module 5 / Page 4

52
Q

What one thing are minimum standards 4 and 6 both focused on?

A

Sediment control

Module 5 / Page 4

53
Q

When man-made channels are analyzed due to MS-19, what needs to be verified?

A

The 10-year storm needs to be used to verify that stormwater will not overtop the banks
and the 2-year storm needs to be used to verify stormwater will not cause erosion of channel bed or banks.

(Module 5 /Page 27)

Virginia ESC (Basic) (9 decks)

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