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City of Middleton Stormwater Quality Plan TABLE 3.1- Implementation Alternative #1 BMP Drainage Area (Acres) Direct Watershed TSS Load Received (tons/yr) Stand Alone BMP Removal Efficiency1 Stand Alone Street Sweeping Removal Efficiency2 Net BMP Removal Efficiency After Street Sweeping3 TSS Load Trapped by BMP after Street Sweeping (tons/yr) 40% TSS Removal Area Overall Reduction Construction Cost Land Purchase Total Cost Amount TSS Removed per $1000 (lbs/$1000) BMP Alternative Ranking 200.01 119 17.5 80.5% 5.3% 75.2% 13.1 2.1% $153,911 $0 $153,911 170.8 #1 300.01 75 12.6 61.2% 5.3% 55.9% 7.0 1.2% $72,870 $51,480 $124,350 113.3 #2 1200.01 25.8 3.2 37.5% 5.3% 32.2% 1.0 0.2% $50,325 $0 $50,325 40.5 #4 21.2 3.5% $277,106 $51,480 $328,586 EXISTING STRUCTURAL BMP TOTAL: 191.9 31.4% ONCE-PER-WEEK MECHANICAL STREET SWEEPING TOTAL: 32.4 5.3% GRAND TOTAL: 245.5 40.1% $328,586 1. Stand Alone BMP Removal Efficiency is equal to the Direct Watershed TSS Load Received/TSS Load Trapped. 2. Stand Alone Street Sweeping Removal is the percent removal achieved by using a Mechanical SS, with No Parking Controls 3. Net BMP Removal Efficiency After Street Sweeping is equal to the Stand Alone BMP Efficiency minus the Stand Alone SS Efficiency PROPOSED STRUCTURAL BMP TOTAL: