Transcript Street Sweep Project

Background
Street Sweeping!
•The City wanted a pilot study before committing to wide-scale use
of street sweeping as a BMP
•Watershed for the City’s nested stormwater monitoring site chosen
for pilot study
Background
Background
Pilot Area Facts
•Moores Run Watershed Area – 2,335 acres
•Moores Run Watershed % Imperviousness – 33%
•Total Pilot Watershed Area (Within Moores Run Watershed) – 107
acres
•Pilot Watershed % Imperviousness – 34%
Background
Pilot Area Facts
•Total Route Length – 22,424 feet
•Sweeping Path Width – 12 feet
•Total Area Swept (both sides of the street) – 12.35 acres
•Percentage of Pilot Watershed area swept – 11.6%
Procedure
1. Every second and fourth Wednesday of the month, streets are
swept in the pilot study area. After completing the route, the
sweeper goes to the NW Transfer Station
Procedure
Baltimore City Pilot Street Sweeping Program
Findings
Total Copper Storm EMCs (ppb)
Hamilton Watershed Stormwater EMCs
Compare Storms Before & After Street Sweeping Began
Copper concentration declined.
120
100
80
60
40
20
0
Before
After
Findings
Total Nitrogen Storm EMCs (ppm)
Hamilton Watershed Stormwater EMCs
Compare Storms Before & After Street Sweeping Began
Total nitrogen concentration declined.
10
8
6
4
2
0
Before
After
Findings
Total Phosphorus Storm EMCs (ppm)
Hamilton Watershed Stormwater EMCs
Compare Storms Before & After Street Sweeping Began
No reduction for total phosphorus.
2
1.6
1.2
0.8
0.4
0
Before
After
Summary
In Conclusion…
•The Street Sweeping Program is removing a tremendous amount of
debris
•Signs of reductions in the Storm water samples
•Due to variability, it is hard to credit the reductions to the Street
Sweeping Program
Summary
Plans in the future…
•Need to keep collecting data
•Reduce the amounts of variability by increasing the frequency of
sweeping
Any Questions…
Contact:
William P. Stack, Chief
Water Quality Management Section
410-396-0732
[email protected]
Norman Seldon
[email protected]
Daisuke Matsuo
[email protected]