SW5240501_SNAP Tool_20240925 (2)

Project Information Complete this sheet if required by your reviewing authority.
Contact them for any questions. Grey boxes/text are optional.
SNAPv4.2.0 LOCATION
Project Name(optional): Gaston Concrete Parcel ID(optional):
Submission Date(optional): 8/21/2024 date Nutrient Management Watershed: Tar Pamlico menu
Local Jurisdiction/Reviewing Agency: Youngsville menu Subwatershed: Upper_Tar_River menu
Project Latitude Coordinates(optional): N Phosphorus Delivery Zone: Tar- Upper 03020101 menu
Project Longitude Coordinates(optional): W Nitrogen Delivery Zone: Tar- Upper 03020101 menu
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PROJECT DETAILS
Development Land Use Type: Commercial menu Disturbed Area: 108,728 ft2
Part of Common Development Plan? no yin Project Activity: New Development menu
Designated Downtown Area? no yin Project Drains to SA Waters? yes yin
Public Linear Road/Sidewalk Project? .no yin Pre-Project Land Use: forest menu
Project Owner Type: Private menu 1 Project Description(optional):
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STORMWATER DETAILS
(Falls ONLY)Onsite Reduction%Req. % Project Uses LID/Runoff Volume Match? no y/n
Existing BUA/Development Onsite? no yin Local Gov't nutrient req's same as State? N/A yin
Local Gov't cutoff date for Existing BUA: 07/06/2012 date Project Drains to Regional SCM? no yin
Nitrogen Export Rate Target: 4.00 Ib/ac/yr Total Nitrogen Offset Credits Needed: Ib/yr
Phosphorus Export Rate Target: 0.40 Ib/ac/yr Total Phosphorus Offset Credits Needed: Ib/yr

SNAP v4.2.0
Project Area and Offsite Land Cover Characteristics Precipitation Louisburg
Station:
Copy i Paste VALUES ONLY for Best Results Click here to scroll down to error messages on this sheet.
PROJECT AREA LAND COVERS TN EMC (mg/L) TP EMC (mg/L) Pre-Project Area (ft2) Post-Project Area (ft2) Change pre-to-post(ft2)
1
Roof 1.18 0.11 4,600 4,600
Roadway 1.64 0.34 0
Parking/Driveway/Sidewalk 1.42 0.18 36,000 36,000
Protected Forest 0.97 0.03 0
Managed Pervious/Landscaping 2.48 1.07 221,550 180,950 -40,600
Offsite or Existing Roof 1.18 0.11 0
Offsite or Existing Roadway 1.64 0.34 0
Offsite or Existing Parking/Driveway/Sideww 1.42 0.18 0
Offsite Protected Forest 0.97 0.03 0
•
Offsite Managed Pervious 2.48 1.07 0
CUSTOM LAND COVER 1 0
CUSTOM LAND COVER 2 0
CUSTOM LAND COVER 3 0
LAND TAKEN UP BY SCM 1.18 0.11 0
Total (Regulated & UnReg)Area 221,550.00 221,550.00
Project (Regulated)Area 221,550.00 221,550.00

Nutrient Export Summary SNAP v4.2.0
Landcover ft SCM Data Review
Errors/Advisories Errors/Advisories
Avg Annual precip(in)= 45.63 SCM Area(ftZ)= 0
Total(Regulated+
Unregulated)Area(ft2)= 221,550 SCM Treated Area(ft2)= 0
Project(Regulated)
Area(ft)= 221,550 Catchment Routing: No errors
Net BUA(Project Area Treating Runoff from
40,600 Net BUA indicates new development or expansion. no
BUA only ftZ)= Existing BUA or Offsite:
Custom Landcovers are no Disturbed Area(ft2)= 108,728
present:
Total Nitrogen Export Target Total Phosphorus Export Target
Scaled to Project Area(Ib/yr): 20.34I Scaled to Project Area(Ib/yr): 2.03
Total Area Total Area Project Area Total Area Project Area Total Area Project Area
Project Area Total Area Project Area
Nutrient Export Summary (Onsite+ (Onsite Only) Post-Project Post-Project Post-Project Post-Project Post-Project Post-Project Post-Project Post-Project
Offsite) pre-Proiect before before after Treatment after Treatment SCM-Treated SCM-Treated Untreated Untreated
Pre-Proiect Treatment I Treatment Area Only Area Only Areas Areas
Area(All Landcover Types)(acres) 5.0861 5.0861 5.0861 5.0861 5.0861 , 5.0861 0.0000 0.0000 5.0861 5.0861
Percent Built-Upon Area(BUA)(%) 0% 0% _ 18% 18% 18% 18% 0% 0% 18% 18%
Built-Upon Area(BUA)(sqft) 0 0 _40,600 40,600 40,600 40,600 0 0 40,600 40,600
Annual Runoff Volume(ft3/yr) 37,910 37,910 162,959 162,959 162,959 162,959 0 0 162,959 162,959
Annual Runoff%Change 330% 330% 330% 330%Total Runoff Change(cuft/yr) 125,049 125,049 125,049 125,049
Total Nitrogen EMC(mg/L) tt 1.60 1.60 1.60 1.60 0.00 0.00 1.60 1.60
Total Nitrogen Load Leaving Site(Ib/yr) MEMMEEM 16.27 16.27 16.27 16.27 0.00 0.00 16.27 16.27
Total Nitrogen Loading Rate(1b/ac/yr) 3.20 3.20 3.20 __ 3.20 0.00 0.00 3.20 3.20
Total Nitrogen%Change Pre-to-Post _ 177% 177% 177% 177%Total Nitrogen Change(Ib/yr)Pre-to-Post 10.40 10.40 10.40 10.40
Total Phosphorus EMC(mg/L) _ 1.07 1.07 0.34 0.34 0.34 0.34 0.00 0.00 0.34 0.34
Total Phosphorus Load Leaving Site(Ib/yr) 2.53 2.53 3.49 l 3.49 3.49 3.49 0.00 0.00 3.49 3.49
Total Phosphorus Loading Rate(Ib/ac/yr) 0.50 0.50 0.69 0.69 0.69 0.69 0.00 0.00 0.69 0.69
Total Phosphorus%Change Pre-to-Post 38% 38% 38% 38%
Total Phosphorus Change(Ib/yr)Pre-to-Post 0.95 0.95 0.95 0.95
SCM/Catchment Summary
SCM ID and Type Volume TN Reduction TP Reduction TN Out TP Out Falls Lake ONLY:Onsite Reduction Compliance Check
Reduction(%) (%) (%) (lbs/ac/yr) (Ibs/ac/yr)
Catchment 1 _ 0.00% 0.00% 0.00% 0.00 0.00 _ II Nitrogen II Phosphorus
101:NA 0.00% 0.00% 0.00% 0.00 0.00 Onsite%Reduction Requirement
102:NA 0.00% _ 0.00% 0.00% 0.00 0.00 Export Target Scaled to Area(Ib/yr) 20.34 2.03
103:NA 0.00% 0.00% 0.00% 0.00 0.00 Export Load Post-Project Before Treatment 16.27 3.49
Catchment 2 0.00% _ 0.00% 0.00% 0.00 0.00 Total Reduction Need(Ib/yr)
201:NA 0.00% 0.00% 0.00% 0.00 0.00 Onsite Reduction Need(Ib/yr)
202:NA 0.00% _ 0.00% 0.00% 0.00 0.00 Onsite Export Target(Ib/yr)
203:NA 0.00% 0.00% 0.00% 0.00 0.00 Project Area Post-Project After Treatment 16.27 3.49
Catchment 3 0.00% _ 0.00% 0.00% 0.00 0.00
301:NA 0.00% 0.00% _ 0.00% 0.00 0.00
302:NA 0.00% 0.00% 0.00% 0.00 0.00
303:NA 0.00% 0.00% - 0.00% 0.00 0.00
Catchment 4 0.00% 0.00% 0.00% 0.00 0.00
401:NA 0.00% _ 0.00% 0.00% 0.00 0.00
402:NA 0.00% 0.00% 0.00% 0.00 0.00
403:NA _ 0.00% 0.00% 0.00% 0.00 0.00
Catchment 5 0.00% 0.00% 0.00% 0.00 0.00
501:NA 0.00% 0.00% 0.00% 0.00 0.00
502:NA 0.00% 0.00% 0.00% 0.00 0.00
503:NA 0.00% I 0.00% 0.00% 0.00 0.00
Catchment 6 0.00% _ 0.00% 0.00% 0.00 0.00
601:NA 0.00% 0.00% 0.00% 0.00 0.00
602:NA 0.00% 0.00% 0.00% 0.00 0.00
603:NA 0.00% 0.00% 0.00% 0.00 0.00

Nutrient Management Strategy Watershed - Nutrient Offset Credit Reporting Form
SNAP v4.2.0
Please complete and submit the following information to the local government permitting your development project
to characterize it and assess the need to purchase nutrient offset credits. Contact and rule implementation
information can be found online at:
http://deq.nc.gov/about/divisions/water-resources/planning/non poi nt-sou rce-ma nagement/n utrient-offset-information
PROJECT INFORMATION
Applicant Name: Gaston Concrete
Project Name: Gaston Concrete
Project Address: 0 Bert Wintson Road,Youngsville,NC
Date: (mm/dd/yyyy) 9/25/2024 Development Land Use Type: Commercial
County: Franklin Project Activity Type: New Development
Project Area(sqft): 221,550 Project Latitude: 0.000000
Post-Project Built-Upon Area%: 18.33% I Project Longitude: 0.000000
WATERSHED INFORMATION
Nutrient Management Watershed: Tar Pamlico N Target Export Rate(Ib/ac/yr): 4.00
Subwatershed: Upper_Tar_River P Target Export Rate(Ib/ac/yr): 0.40
Nitrogen Delivery Zone: Tar-Upper 03020101 Nitrogen Delivery Factor: 100%
Phosphorus Delivery Zone: Tar-Upper 03020101 Phosphorus Delivery Factor: 100%
PERMANENT NUTRIENT OFFSET REQUEST
Post-Project Nitrogen Calculations-Projects with No Offsite or Built-Upon Area
(A) (B) (C) (D) (F) (G) (Where
Applicable)
TN Export TN Remaining TN Permanent Additional Total TN
TN Untreated TN Treated TN Delivery Offsets Permanent
Load(Ib/yr) Target Load Load(Ib/yr) Reduction Factor(%) Required Local Gov't Offsets to
(Ib/yr) Need(lb/yr) (Ib/yr) Offsets(Ib/yr) Buy(Ib/yr)
16.3 20.3 16.3 0.0 100.0% 0.0 0.0 I
Post-Project Phosphorus Calculations-Projects with No Offsite or Built-Upon Area
(A) (B) (C) (D) (F) (G) (Where
Applicable)
TP Permanent Total TP
TP Export TP Remaining Additional
TP Untreated TP Treated TP Delivery Offsets Permanent
Load(lb/yr) Target Load Load(Ib/yr) Reduction i Factor(%) Required Local Gov't Offsets to
(lb/yr) Need(lb/yr) (Ib/yr) Offsets(lb/yr) Buy(Ib/yr)
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3.5 2.0 r 3.5 r 1.5 100.0% 1.5 I 1.5
LOCAL GOVERNMENT AUTHORIZATION
Local Government Name:I
Staff Name: Phone:
Staff Email: Date:
Local Government Authorizing Signature: