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346 <br /> Project Summary <br /> Project Name: Lawerence Road Development <br /> Project Area (ft): 3,680,820 ft 84.5000 acres Submission Date: <br /> Disturbed Area (ft): 3,680,820 ft2 84.5000 acres <br /> County: Local Jurisdiction: Orange County <br /> Development Land Use Type: Mixed-Use Owner Type: Private <br /> Development Activity Type: Development- New Designated Downtown Area? no <br /> Nutrient Management Watershed: Falls Lake Subwatershed: Falls- Upper <br /> Phosphorus Delivery Zone:1 Falls- Upper Nitrogen Delivery Zone: Falls- Upper <br /> Phosphorus Delivery Factor(%): 100% Nitrogen Delivery Factor(%): 100% <br /> Phosphorus Loading Rate Target(Ib/ac/yr): 0.33 Nitrogen Loading Rate Target(Ib/ac/yr): 2.20 <br /> Phosphorus Load Target at Site(lb/yr): 27.89 Nitrogen Load Target at Site(lb/yr): 185.90 <br /> Phosphorus Load Leaving Site w/SCMs(lb/yr): 29.18 Nitrogen Load Leaving Site w/SCMs(lb/yr): 148.61 <br /> P Offsite Buy-Down Threshold Loading Rate(lb/ac/yr): 0.49 N Offsite Buy-Down Threshold Loading Rate 2.49 <br /> Total P Load Reduction Needed (lb/yr): 26.54 Total N Load Reduction Needed (lb/yr): 48.25 <br /> P Load Treatment Balance at Site(lb/yr): 1.29 N Load Treatment Balance at Site(lb/yr): -37.29 <br /> P Load Treatment Balance at Lake(lb/yr): 1.29 N Load Treatment Balance at Lake(lb/yr): -37.29 <br /> Pre-Project Post-Project Post-Project Post-Project <br /> Nutrient Export Summary Whole Site Whole Site Whole Site with SCM-Treated Post-Project <br /> p ry Untreated Area <br /> Conditions without SCMs SCMs Area <br /> Percent Impervious(for runoff calculation) (%) 0.0% 14.1% 14.1% 15.7% 9.4% <br /> Percent Built-Upon Area (BUA) (%) 0.0% 11.4% 11.4% 12.1% 9.4% <br /> Annual Runoff Volume ft3/ r 653,023 2,331,222 2,012,449 1,569,247 4431203 <br /> Annual Runoff%Change(relative to pre-D) 0% 257% 208% <br /> Total Nitrogen EMC(mg/L) 2.48 1.61 1.19 0.99 1.91 <br /> Total Nitrogen Load Leaving Site(lb/yr) 101.13 234.15 148.61 95.69 52.92 <br /> Total Nitrogen Loading Rate(Ib/ac/yr) 1.20 2.77 1.76 1.52 2.48 <br /> Total Nitrogen%Change(relative to pre-D) 0% 132% 47% <br /> Total Phosphorus EMC(mg/L) 1.07 0.37 0.24 0.14 0.58 <br /> Total Phosphorus Load Leaving Site(lb/yr) 43.63 54.43 29.18 13.11 16.07 <br /> Total Phosphorus Loading Rate(Ib/ac/yr) 0.52 0.64 0.35 0.21 0.75 <br /> Total Phosphorus%Change(relative to pre-D) 0% 25% -33% <br />