Summary of Chesapeake Bay Program street sweeping crediting

Summary of Chesapeake Bay Program street sweeping crediting.
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Pollutant Reductions Associated with Different Street Cleaning Practices (SCP)
Practice #	Description	Approx passes per year*	TSS Removal (%)**	TN Removal (%)**	TP Removal (%)**
SCP-1	AST- 2 PW	100	21	4	10
SCP-2	AST- 1 PW	50	16	3	8
SCP-3	AST- 1 P2W	25</td	11	2	5
SCP-4	AST- 1 P4W	10	6	1	3
SCP-5	AST- 1 P8W	6	4	0.7	2
SCP-6	AST- 1 P12W	4	2	0	1
SCP-7	AST- S1 or S2	15	7	1	4
SCP-8	AST- S3 or S4	20	10	2	5
SCP-9	MBT- 2PW	100	0.7	0	0
SCP-10	MBT- 1 PW	50	0.5	0	0
SCP-11	MBT- 1 P4W	10	0.1	0	0

*Depending on the length of the winter shutdown, the number of passes/yr may be 10 to 15% lower than shown.

• •  % removal represents the proportion of the impervious surface unit area load removed
    

Table abbreviations: AST: Advanced Sweeping Technology ; MBT: Mechanical Broom Technology ; 2PW: 2 passes per week; 1PW: 1 pass every week; 1P2W: 1 pass every 2 weeks; 1P4W: 1 pass every 4 weeks; 1P8W: 1 pass every 8 weeks; 1P12W: 1 pass every 12 weeks