SW5211201_Design Calculations (NSW)_20220221

Nitrogen Calculations (on -site areas)
Item
Proposed Site Information
On -Site Area
Off -Site Area
Total
1
Total project acreage
2.00
0.00
2.00
2
Total proposed impervious
area
0.89
0.00
0.89
3
Existing impervious area
0.08
0
0.08
4
New impervious area
(Item 2-Item 3)
0.81
0
0.81
5
ennanent y -protected
undisturbed open space
0
0
0
6
Permanently protected
managed open space
1.11
0.00
1.11
Existi nq Conditions Loadin (On- site areas
Tye of Land Cover
Area acres
TN export/coefficient
lbs a r
TN export from use
lbs/ r
Permanently protected
undisturbed open space
0
0.6
0.00
Permanently protected
managed open space
1.920
1.2
2.30
Impervious surfaces
0.08
21.2
1.70
Total
2.000
4.00
Item 7
Item 8
Nitrogen Loading Rate (Ibs/ac/yr)
2.00
Proposed Development Areas On -Site areas
TN export/coetr1cient
TN export from use
Type of Land Cover
Area (acres)
lbs/acl r
lbs/yr
Permanentiy pro e
undisturbed open space
(Item 5
0
0.6
0.00
ermanen y pro eaed
managed open space*
(Item 6)
1.110
1 1.2
1.33
Impervious surfaces
(Item 4)
0.890
21.2
18.87
Total
2.000
20.20
Item 7
Item 8*
Nitrogen Loading Rate (Ibs/ac/yr)
10.10
Post-Dev ment Loadin after Offset Pa ents
Item
Description
Pre -Developed +Post -
Developed Loading
8
Total TN export (lb/yr)
14.56
Post -De ve% ment Loadlnjg after Offset Payments
Item
Description
Nitrogen Loading Rate
Ilbs/ac r
9
Post -Developed TN Load
719
10
Nitrogen load offset by
3.68
Davments (Item 9 - 3.6)
Amount of Offset (buy -down loading rate x apportioned site area)(lbs/yr): 7.36
30-Year Offset Amount (Pounds of Nitrogen x 30 Years)(lbs): 220.72
NCEEP Offset Payment Rate ($/Ib) $24.77
NCEEP Offset Payment Amount: 45,467.14

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