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Project Title: ______________________________________________

Part I. Riparian Buffers

Area includes riparian buffers?     [ ] No                [ ] Yes              [ ]Exempt

If yes,                                                   [ ] 50 foot          [ ] 100 foot

River Basin?                                          [ ] Neuse           [ ] Cape Fear

Basis for exemption_________________________________________

Show buffers on site plan.

 

Part II. Nitrogen Calculations (Method 1, Appendix C):

a. Subdivision information:

Number of lots

 

 

Amount of Right-of-Way

 

Total area of lots (excluding R/W and open space)

 

 

Percent of Right-of-Way

that is impervious area

 

Number of lots/acre

 

 

Amount of Right-of-Way

 

Average lot size

 

 

that is impervious area

 

Impervious area per lot

 

 

Total estimated impervious area

 

 

b. Pre-development loading:

 

Area

 

TN export coeff.

TN export

from use

Type of Land Cover

(acres)

(lbs/ac/yr)

(lbs/yr)

Permanently protected undisturbed open space (forest, unmown meadow)

 

 

0.60

 

Permanently protected managed open space (grass, landscaping, etc.)

 

 

1.20

 

Impervious Area

 

21.20

 

TOTAL

 

 

 

 

Pre-development Nitrogen Loading Rate (lbs/ac/yr) = __________

 

c. Post-development loading:

 

 

Area

 

TN export coeff.

TN export

from use

Type of Land Cover

(acres)

(lbs/ac/yr)

(lbs/yr)

Permanently protected undisturbed open space (forest, unmown meadow)

 

0.60

 

Permanently protected managed open space (grass, landscaping, etc.)

 

1.20

 

Right-of-Way (read TN export from Graph1)

 

 

 

Lots (read TN export from Graph 2)

 

 

 

TOTAL

 

 

 

 

Post-development Nitrogen Loading Rate (lbs/ac/yr) = __________

 

Proposed BMP(s) ________________________

Nitrogen Load after BMP = _________________

Nitrogen Load Offset by Payments = _________

Net change in on-site N Load = _____________ (Post BMP load less Pre-development N load)

 

Part III. Control of Peak Stormwater Flow (for 1 year, design storm)

Calculated Pre-development Peak Flow    __________

Calculated Post-development Peak Flow__________

Proposed BMP(s)____________________________

Post BMP Peak Flow _________________________

 

I, the undersigned, certify to the best of my knowledge that the above information is correct (affix seal).