Background The City wanted a pilot study before committing to wide-scale use of street sweeping as a...

Background

•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

Street Sweeping!

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%

Background

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

ProcedureBaltimore City Pilot Street Sweeping Program

Total Copper Storm EMCs (ppb)

Before After0

20

40

60

80

100

120

Hamilton Watershed Stormwater EMCs Compare Storms Before & After Street Sweeping Began

Copper concentration declined.

Findings

Hamilton Watershed Stormwater EMCs Compare Storms Before & After Street Sweeping Began

Total nitrogen concentration declined.

Total Nitrogen Storm EMCs (ppm)Before After

0

2

4

6

8

10

Findings

Hamilton Watershed Stormwater EMCs Compare Storms Before & After Street Sweeping Began

No reduction for total phosphorus.

Total Phosphorus Storm EMCs (ppm)Before After

0

0.4

0.8

1.2

1.6

2

Findings

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, ChiefWater Quality Management Section410-396-0732bill.stack@baltimorecity.gov

Norman Seldonnorman.seldon@baltimorecity.gov

Daisuke Matsuodaisuke.matsuo@baltimorecity.gov