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  1. 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

  2. Background

  3. 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%

  4. 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%

  5. Procedure • 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

  6. Procedure Baltimore City Pilot Street Sweeping Program

  7. Findings Hamilton Watershed Stormwater EMCs Compare Storms Before & After Street Sweeping BeganCopper concentration declined.

  8. Findings Hamilton Watershed Stormwater EMCs Compare Storms Before & After Street Sweeping BeganTotal nitrogen concentration declined.

  9. Findings Hamilton Watershed Stormwater EMCs Compare Storms Before & After Street Sweeping BeganNo reduction for total phosphorus.

  10. 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

  11. Summary • Plans in the future… • Need to keep collecting data • Reduce the amounts of variability by increasing the frequency of sweeping

  12. Any Questions… Contact: William P. Stack, Chief Water Quality Management Section 410-396-0732 bill.stack@baltimorecity.gov Norman Seldon norman.seldon@baltimorecity.gov Daisuke Matsuo daisuke.matsuo@baltimorecity.gov