Florida Stormwater, Erosion, and Sedimentation Control Study Guide

Chapter 1 - Erosion and Sedimentation

___________ is the process by which the land surface is worn away by the action of wind, water, and gravity.

erosion

___________ is the settling out of soil particles transported by water and wind.

sedimentation

soil erosion can be classified as either _________ erosion or ________ erosion, and the sources can be either __________ or ____________

wind; water; natural; manmade

water erosion can be classified as either ______ erosion or _____________ and ____________ erosion.

overland; stream; channel

four processes of overland erosion are?

splash or rain drop erosion, sheet erosion, rill erosion, and gully erosion

four principle factors influencing soil erosion are?

soil characteristics, vegetative cover, topography, and climate

list three physical effects of erosion and sedimentation:

increased flooding reduced hydraulic capacity in rivers, streams, channels, reservoirs; increased maintenance of stormwater systems; increased water treatment costs; and decreased recreational value

list three biological effects of erosion and sedimentation

*reduced light for aquatic plants

*clogs fish gills

*impairs spawning

*disrupts food chain

*blankets bottom, suppresses aquatic life

*disrupts ecosystem

planning the development to fit the terrain using the particular:

topography; soils; drainage patterns; natural vegetation of the site; and minimize the extent of the area exposed at one time and the duration of exposure

apply _____________ practices to protect the disturbed area from off-site runoff and to protect off-site areas from sediment damage

perimeter control

apply _________ practices to prevent excessive on-site damage

erosion control

Keep runoff velocities ___ and _____ runoff on the site.

low; retain

it is very important to stabilize disturbed areas ________________ after final grading to prevent raindrop impacts from causing erosion

immediately

implement a thorough ______________ and _____________ program as required in the Construction Generic Permit (CGP).

maintenance; follow up

Chapter 2 - Soils

soil particles smaller than 0.002 mm are classified as ______ and _______ are the two soil types that cause the most erosion/turbidity problems in Florida and the Word

clay; muck

Soils in the Type A hydrologic group have _________ infiltration rate and _________ runoff potential even when thoroughly wetted

high; low

Soils in the Type D hydrologic group have ___________ infiltration rates and _______ runoff potential when thoroughly wetted

low; high

the ____________________ is the only factor in the Universal Soil Loss Equation which is beyond the developer's control

rainfall index

________________, _______________, and _______________ are the factors most easily manipulated by the developer

slope length, gradient, and cover factor

the RUSLE is used on our construction sites to predict: __________

soil loss

stabilize disturbed lands immediately to save ____________

money

who can you contact for soil survey information?

NRCS

what are the five soil forming factors?

climate, topography, organisms, parent material, time

Chapter 3 - Temporary BMPs for Erosion and Sedimentation Control

waste disposal is a problem for the individual workers and some subcontractors, but it's no big deal

false

truck washing should be done in designated area, not near the perimeter controls

true

storage paints, solvents, cements, pesticides, acids, or other potentially polluting chemicals is no big deal because they are only stored temporarily and get used up quickly

false

the public needs to understand that dust is just a normal part of construction

false

a temporary gravel construction entrance must extend the full width of the entrance. it must be at least ____ feet long and at least ___ inches thick. Aggregate should be ___ in. stone or FDOT No. 1 stone. prior to installing the gravel, a ___________ should be placed on the ground to simplify installation and maintenance

50; 6; 2; 1; geotextile

maintenance should be performed when void spaces are full of ________

sediment

the maximum drainage area for a silt fence under sheet flow conditions are ________ acre per 100 feet of barrier length

1/4

the average usable life of a silt fence is _______ months

6

for proper installation of a silt fence, a trench ____ inches deep and ____ inches wide must be excavated. this will allow the ___ inches of fabric to extend into the ground for backfilling and compaction

4; 4; 8

the maximum drainage area for an inlet protection device is ___ acre

1

when constructing a silt fence drop inlet sediment filter, a trench ___ inches deep and ___ inches wide must be excavated to allow ___ inches of the fabric to extend into the trench

4; 4; 8

stakes shall be ____ x ____ by ____ feet long and a 2" x 4" frame will be constructed _______________________ for proper stability

2"; 4"; 3; around the top of the stakes

the purpose of a sediment trap is to ______________ turbid water

detain

the maximum drainage area for a temporary sediment trap is ____ acres. the initial storage capacity is ________ cubic yard per acre. maximum life should be ____ months

5; 134; 18

when constructing a pipe outlet sediment trap, the top of the riser pipe must be at least ____ feet below the top of the embankment

1.5

when constructing a storm inlet sediment trap, the trap shall be between _____ feet deep measured from the low point of the outlet

1 -2

the purpose of a sediment basin is to ___________ turbid runoff from disturbed areas

detain

a sediment basin is required for a drainage area of more than _____ acres

10

in a sediment basin, baffles are used to increase flow length

true

the maximum allowable drainage area for a temporary slope drain is _____ acres

5

a diversion or earthen dike shall be used to direct stormwater into the temporary slope drain

true

the height of the dike at the inlet shall be equal to the ________________ plus ____ inches

pipe diameter; 6

the maximum spacing between check dams should be such that the ____________ of the upstream dam is at same elevation as the _______ of the downstream dam

bottom; top

sediment should be removed from check dams, when it reaches __________ of the original height or before.

half

a floating turbidity curtain is designed to ___________ sediment laden water and allow enough _______ for sediments to settle out of suspension

contain; time

a type III floating turbidity curtains may be used in considerable flow conditions, meaning less than ____ feet per second or ____ knots

5; 3

in flowing water turbidity curtains should be places ______________________ the direction of flow, not ______________

parallel/along to; perpendicular/across

anchor lines shall be attached to the ___________, not to the ___________________

buoys; bottom of the curtain or float

in tidal and/or wind and wave conditions there should be a ______-foot gap between bottom of the curtain and the floor of the water body at mean low water

one

sediments shall be allowed to settle a minimum of 72 hours prior to removal of the turbidity curtain

false

Chapter 4 - Vegetation

the three purposes of soil roughening are:

aid in establishment of vegetative cover; reduce runoff velocity & increase infiltration and reduce erosion and provide for sediment trapping

the purpose of _____________ is to provide a suitable growth medium for final site stabilization with vegetation

top-soiling

the subgrade should be prepared by _____________ or __________ to insure bonding of the topsoil with the subsoil

discing or scarifying

areas that are at rough grade for 14 days or more should receive ___________ seeding immediately

temporary

list three soil conditioners

peat, sand, vermiculite, rotted manure, rotted sawdust, treated sewage sludge

Name the two soil amendments usually required prior to permanent seeding:

fertilizer and lime

A stand of vegetation is considered fully established after ___ year.

one

when sodding a slope, strips should be laid ______________ the contour. joints should be __________. start from the ____________ and ________ toward the top

along; staggered; bottom; work

list three beneficial function of mulch

1. protects soil from raindrop erosion

2. moderates soil temperature

3. moderates soil moisture

4. reduces velocity of overland flow

5. improves soil texture and nutrients

6. control/reduce weeds

Straw mulch should be applied at a rate of ___ lbs. per 1000 sq. ft.; ___ bales per 1000 sq. ft. or ___ tons per acre

70-90; 1.5-2; 1.5 - 2

when installing erosion control nets or blankets, work from the ________ towards the _________

top; bottom

Effective tree protection should be installed no closer than _ feet from the trunk or the _____ of the tree.

8; dripline

a good place for material storage, parking, and portable toilets is inside the tree protection zone

false

Chapter 5 - Dewatering

what types of dewatering systems generally produce clear, non-turbid groundwater?

Well-point and Sock pumps

what kind of water quality does a rim ditch system produce?

the poorest water quality with highest turbidity NTU levels

what does a well-point and sock/horizontal pump systems must have in order to function properly?

requires some sandy soils to function

what methods are used to manage non-stormwater discharges & remove sediment from construction pumping?

sediment traps & basins, weir & dewatering tanks, and chemical treatment

FDEP General Permit for Dewatering requires that you be how many feet from a "known contamination source"?

500 feet or greater

what tools can be used by the permit applicant to determine the cleanup and restotration status of a known contamination site?

The Contamination Locator Map and the Institutional Controls Registry Web Viewer

what must the permittee do if the discharge from their dewatering notcies the presence of a pollutant or pollutants such as sheen, or odor?

cease operation immediately, contact their DEP District Ground Water Section for guidance, and contact the 24 Hour Reporting - State Warning Point

when using chemical treatment systems, what should you remember?

the right chemical at the right dosage

What two are the most common and approved flocculant chemicals utilized to control turbidity on a job site to reduce turbidity?

anionic polyacrylamide (PAM) and Aluminum Sulfate (Alum)

before discharging chemically treated water, what should you test for?

pH and turbidity limits

the US EPA authorized Florida to implement the NPDES in what year:

2000

the NPDES Generic Permit for Florida in the phase II implemented was effective on this year:

2015

small construction activity that results in disturbing ______________ acres total land area.

one up to 4.99

large construction activity that results in disturbing __________ acres or more total land area.

five

what is a construction activity?

clearing pine trees and burning them

a conveyance or system of conveyances is what?

stormwater systems

a linear project is a road?

true

is getting a permit the first responsibility of the

operator

the person, firm, contractor, public organization, or other legal entity are known as the

operator

does the operator must develop what first?

develop the SWPPP

can you now complete the whole NOI application electronically and submit it as well electronically?

true

after getting the NOI and the acknowledgement letter you can start clearing land?

false

what do you do with the NOI once you get it for the Notice Center?

post on the job board

the CGP permit will allow you to do the following:

construction activity

Chapter 7 - SWPPP

the Qualified Inspector is anyone who has:

passed the FSESCI class

can the SWPPP exceed the requirements under Part IV of the CGP?

true

once your site has achieved final stabilization of 70% or greater you have how many calendar days to submit an NOT?

14

can you transfer your NOI to a new contractor

false