Region 1 nutrient reduction efficiency factors for sweeping impervious areas (USEPA 2017a) Region 1 nutrient reduction efficiency factors for sweeping impervious areas (USEPA 2017a)

Region 1 nutrient reduction efficiency factors for sweeping impervious areas (USEPA 2017a).
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Frequency	Sweeper technology	Phosphorus reduction factor	Nitrogen reduction factor
2/year (spring and fall)	Mechanical Broom	0.01	0.01
2/year (spring and fall)	Vacuum Assisted	0.02	0.02
2/year (spring and fall)	High-efficiency Regenerative Air-Vacuum	0.02	0.02
Monthly	Mechanical Broom	0.03	0.03
Monthly	Vacuum assisted	0.04	0.04
Monthly	High-efficiency Regenerative Air-Vacuum	0.08	0.08
Weekly	Mechanical broom	0.05	0.06
Weekly	Vacuum assisted	0.08	0.07
Weekly	High-efficiency Regenerative Air-Vacuum	0.10	0.10