Storm Water Runoff Flashcards
What size construction sites require a National Pollutant Discharge Elimiination System (NPDES) Permit?
Construction sites which disturb 5 or more acres of land
What are the six major phases of the pollution prevention plan process?
- Site Evaluation and design development
- Assesment
- Control Selection and Plan Design
- Certification and Notification
- Construction/Implementation
- Final stabilization/termination
What information is collected from the site during site evaluation?
Existing soil information, existing runoff water quality, location of surface waters, name of receiving water
What are the four requirements within the site evaluation phase?
A. Collect Site Information
B. Develop Site Design
C. Describe Construction Activity
D. Prepare pollution prevention site map
What are the three things that should be done during the assesment phase?
A. Measure the site area
B. Measure the drainage areas
C. Caculate the runoff coefficient
What is the ācā runoff coefficient?
Indicates the percent of water that falls on a type of material that will end up as surface runoff.
To complete the storm water pollution prevention plan during the control plan design phase one must:
A. Review and incorporate State and Local Requirements
B. Select Erosion and Sediment Controls
C. Select other controls
D. Select storm water management controls
E. Indicate the location of controls in the site map
F. Prepare an inspection and mainteance plan
G. Prepare a description of controls
H. Prepare a sequence of major activities
Disturbed areas of the construction site that will not be redistrubed for 21 days or more mut be stabilized by the what day after the last disturbance?
14th day by temporary or permanent seeding or mulching
What are some structural control measures to divert flows away from disturbed areas?
Earth Dike, Silt Fence, Sediment Trap, Sediment Basin
What control must be used where more than 10 acres in the upstream drainage area are distubred at one time? And the required capacity?
A temporary or permanent sediment basin must provide at least 3,600 cubic feet of storage for every acre of land which it drains.
The EPA expects that most sites can employ measures to remove at least what percentage of the total suspended soilds from post-construction run-off?
80%
What measures will be installed to control pollutants in storm water after construction?
> Retention Pond - holds runoff without release except by evaporation, infiltration or emergency bypass
Detention Pond - holds runoff for limited time releasing it slowly
Infiltration Measures - allow the percolation of water through ground surface into subsurface soil
Vegetated seales and natural depressions - transport, filter and enhance infiltration runoff
During the certification and notification phase you must?
A. Certify the pollution prevention plan by a signature from an authorized representative of the company.
B. Submit a Notice of Intent at least 2 days before construction activities begin.
How often should inspections occur during construction?
Every 7 days or within 24 hours of a storm of 0.5 inches or more in depth
After the inspection, how many days do you have before it must be repaired?
7 days
