Loose gravel in Bike Lane

Category: 15. Location where a hazard (ie: bad drainage grate, dangerous driveway, poor sight distance, etc.) exists. Please explain in comment field.

Used in the following map:

Philadelphia Pedestrian and Bike Master Plan

There is a lot of gravel and debris in the bike lane making this corner particularly dangerous. I think it has to do with the run off from the plantings on the sidewalk.