Seattle Public Utilities (SPU) and Herrera conducted a study to examine the pollutant removal effectiveness of regenerative air street sweeping compared to catch basin cleaning and structural stormwater BMPs. Herrera provided support for the experimental design, monitoring implementation, and reporting. The project entailed analyzing 33 catch basin, street dirt, and sweeper waste samples from 9 locations over one water year and determined that Street Sweeping is pound for pound one of the most cost effective BMPs available for sediment removal.