Charleston Bus Annex
Charleston Annex Sto.. - Trb-adc60.org
Charleston Annex Sto.. - Trb-adc60.org
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<strong>Charleston</strong> <strong>Bus</strong> <strong>Annex</strong><br />
Stormwater Pollution Prevention<br />
A Case Study
Typical NYCT Construction
NYCT <strong>Bus</strong>es<br />
‣ 4500+ buses<br />
‣ 20+ Depots<br />
‣ 700 Hybrid Electric<br />
‣ All use Ultra Low Sulfur Diesel (ULSD)<br />
and have Diesel Particulate Filters (DPF)<br />
‣ The “cleanest” fleet in North America
ARTHUR KILL<br />
MANHATTAN
The Site<br />
‣ 11 acres<br />
‣ Soil: mostly clay<br />
‣ Topography: 60’ difference in elevation
Regulations
Stormwater Regulations - Federal<br />
‣ Section 402 of the Clean Water Act<br />
“stormwater<br />
discharges from certain<br />
construction activities to waters of the US are<br />
unlawful unless authorized by a National<br />
Pollutant Discharge Elimination System<br />
(NPDES) permit or approved State program”<br />
‣ EPA’s s Phase II Stormwater Regulations<br />
• Need NPDES for construction sites > 1 acre
Stormwater Regulations - State<br />
‣ New York State<br />
‣ State Pollutant Discharge Elimination<br />
System (SPDES) – NYS DEC<br />
‣ General Permit for Stormwater Runoff<br />
from Construction Activity (GP-0-08<br />
08-001) 001)<br />
‣ Includes post-construction controls!
Stormwater Regulations - State<br />
‣ Construction Start Date – no ground<br />
intrusive activity until we have a permit<br />
‣ Stormwater Pollution Prevention Plan<br />
(SWPPP)<br />
‣ Five (5) Day Coverage<br />
‣ Sixty (60) Day Coverage<br />
‣ Depends on compliance with technical<br />
standards
What are construction pollutants?<br />
‣ Silt<br />
‣ Sediment<br />
‣ Nutrients<br />
‣ Floatables (oil and grease)
Stormwater Pollution Prevetion<br />
Plan (SWPPP)
Contents of SWPPP<br />
1. Erosion & Sediment Control<br />
2. Inspection & Maintenance<br />
3. Water Quality Control Plan
1. Erosion and<br />
Sediment Control
SWPP Temporary<br />
[Construction] Measures<br />
‣ Silt fence/straw bales<br />
‣ Stabilized Construction Entrance/Exit<br />
‣ Dust Control<br />
‣ Soil Stabilization<br />
‣ Catch Basin/Inlet Protection<br />
‣ Sediment Traps<br />
‣ Slopes & Swales<br />
‣ Construction Sequencing
Silt Fence/Straw Bales
Stabilized Construction<br />
Entrance/Exit
Truck Wheel Washing
Dust Control
Soil Stabilization
Catch Basin/Inlet Protection
Sediment Traps
Slopes & Swales
Construction Sequencing<br />
‣ Install silt fence along perimeter<br />
‣ Install Construction entrance<br />
‣ Clear & grub<br />
‣ Grade eastern portion of site to Sediment<br />
Trap #2<br />
‣ Construct temporary roadway & stabilize<br />
with gravel<br />
‣ Grade western portion of site to Sediment<br />
Trap # 1
2. Inspection and<br />
Maintenance
Sediment<br />
leaving site<br />
is bad<br />
inspect 2x every 7 days<br />
& after 1/2” rainfall
No riprap at<br />
outlet
Torn silt fence,<br />
improper installation
3. Water Quality<br />
Control
‣ Permanent measures – post construction<br />
• Catch Basins with Sumps and Hoods<br />
• Hydrodynamic Separators<br />
• 80% load reduction
CATCH BASIN<br />
WITH SUMP & HOOD
Hydrodynamic Separator
Prepared by:<br />
Thomas Abdallah, P.E.<br />
Chief Environmental Engineer<br />
MTA New York City Transit
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