8. Site Development Flashcards
Bank (BCY) =
material in its natural state before disturbance
Loose (LCY) =
material that has been disturbed or loaded
Compacted (CCY) =
material after compaction
What is relative density?
ratio of field dry density/lab max dry density.
Erosion vs Sedimentation.
Erosion is the process by which land is worn away; Sedimentation is the process by which the eroded material is transported and deposited.
Types of Erosion?
- Splash Erosion - cover is stripped away by rain
- Sheet Erosion - sheet flow transports soil particles that have been detached by splash erosion
- Rill Erosion - sheet flow becomes deeper concentrated flow along the low spots (rills)
- Gully Erosion - when runoff cuts rills deeper and wider or when rills come together to form a large channel.
- Streambank and Streambed Erosion - scouring away of stream banks.
- Wind Erosion - similar to sheet erosion only via wind; suspension and saltation - very find dirt and dust particles lifted in the wind; saltation when particles drift horizontally across the surface increasing in velocity; surface creep: large particles too heavy to be lifted into the air roll across the surface and cause damage
What are some impact of construction on adjacent facilities?
- Noise
- Changing the landscape of affected area
- Right-of-way
- Economic or social impact (e.g. impact to business or neighborhood)
When is a Storm Water Pollution Prevention Program (SWPPP) required?
Construction sites of ONE acre and more of disturbed area.
What are some methods of erosion control?
- Compost blanket
- Grass channels
- Prefabricated blanket made of natural or synthetic materials
- Seeding and fertilizing (most effective)
- Geotextiles
- Chemical stabilization
- Stream bank stabilization
What are some runoff control practices?
- Check dam
- Diversion Dike/Swale
- Grass-lined Swale
- Outlet Protection
- Pipe Slope Drain
- Surface Roughening
Methods of sediment control?
- Silt fences
- Sediment Trap
- Sediment Basin
- Riprap basin
- Wattles
When and what spacing must safe access and egress be provided per OSHA for excavations?
4 feet or deeper; spaced no more than 25 feet of lateral travel. Inspected daily.
Per OSHA when must fall protection be provided?
Where an unprotected side or edge is 6 feet or more above a lower level . For steel erection, trigger elevation is 15 feet and for scaffolds is 10 feet.
How much weight should a scaffold be capable of supporting?
at least 4x the maximum intended load.
What are OHSA’s ladder requirements?
- Ladder to be 1 foot away from the wall for every 4 feet of the ladder’s length to the support point.
- Ladder side rails shall extend at lease 3 feet or 3 rungs above the landing surface
- nonconductive side rails is used where employee or ladder could be exposed to energized electrical equip.
