Erosion
What is erosion?
movement of soil particles from one location to another by wind, water, or ice
What does NOI stand for?
Notice of Intent
What does BMP stand for?
Best Management Practice
What is turbidity?
The cloudiness caused by suspended soil particles in water
What does SWPPP stand for?
Stormwater Pollution Prevention Plan
what is sedimentation?
Part 2 of erosion: depositing of soil
When do you have to file an NOI in Washington?
60 days before construction starts
What is the best BMP against erosion?
When can you use a transparency tube?
On projects in Washington that are under 5 acres
Name 3 of the 13 elements required in a Washington SWPPP
#1 – Preserve Vegetation / Mark Clearing Limits
#2 – Establish Construction Access
#3 – Control Flow Rates
#4 – Install Sediment Controls
#5 – Stabilize Soils
#6 – Protect Slopes
#7 – Protect Drain Inlets
#8 – Stabilize Channels and Outlets
#9 – Control Pollutants
#10 – Control De-Watering
#11 – Maintain BMPs
#12 – Manage the Project
#13 – Protect Low Impact Development BMPs
Name 1 of the 3 soil types
sand, silt, clay
Department of Ecology
What is an example of a sediment control BMP?
Silt fence, straw wattles, slope breakers, check dams
What does NTU stand for?
Nephelometric Turbidity Units
How long does a SWPPP need to be maintained?
For 3 years, or until 70% revegetation has been achieved
What is mass wasting?
Large scale natural erosion
What 2 items must be posted in a visible location on your job site?
The NOI and the CESCL contact information
What is an example of an erosion control BMP?
Vegetation, seed an mulch, blanket, hydroseed, plastic
What units do you use for a transparency tube?
Centimeters
When do you have to conduct a SWPPP inspection?
Every week and after discharge to waters of the state
OR
Monthly if your site is temporarily stabilized
What is the best way to prevent erosion?
Leave the natural vegetation!
Create a designated area for hazardous materials
Cover that area
Label the 55 gallon drums/containers
Use secondary containment
Keep haz mat away from sensitive areas
Is a CESCL a BMP?
YES!
What units does a turbidity meter use?
NTUs
What does NPDES stand for?
National Pollution Discharge Elimination System