SW4230801_SNAP Tool_20231208

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): ACC Public Safety Training Center Parcel ID(optional):
Submission Date(optional): date Nutrient Management Watershed: Jordan Lake menu
Local Jurisdiction/Reviewing Agency: Winston-Salem menu Subwatershed: Haw_River menu
Project Latitude Coordinates(optional): N Phosphorus Delivery Zone: Jordan-030050 menu
Project Longitude Coordinates(optional): W Nitrogen Delivery Zone: Jordan-030050 menu
PROJECT DETAILS
Development Land Use Type: Institutional menu Disturbed Area: 1,470,586 ft2
Part of Common Development Plan? no yin Project Activity: New Development menu
Designated Downtown Area? no y/n Project Drains to SA Waters? no y/n
Public Linear Road/Sidewalk Project? no y/n Pre-Project Land Use: fallow/open menu
Project Owner Type: State non-NCDOT menu Project Description(optional):
L
STORM WATER DETAILS
(Falls ONLY)Onsite Reduction%Req. % Project Uses LID/Runoff Volume Match? no y/n
Existing BUA/Development Onsite? yes y/n Local Gov't nutrient req's same as State? yes y/n
Local Gov't cutoff date for Existing BUA: 08/11/2009 date Project Drains to Regional SCM? no y/n
Nitrogen Export Rate Target: 1.43 Ib/ac/yr Total Nitrogen Offset Credits Needed: Ib/yr
Phosphorus Export Rate Target: 1.43 Ib/ac/yr Total Phosphorus Offset Credits Needed: lb/yr

SNAP v4.2.0
Project Area and Offsite Land Cover Characteristics Precipitation Burlington
Station:
Copy & Paste VALUES ONLY for Best Results Click here to scroll down to error messages on this sheet.
I I
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)
Roof 1.18 0.11 0 32,013 32,013
Roadway 1.64 0.34 55,597 292,083 236,486
Parking/Driveway/Sidewalk 1.42 0.18 0 77,217 77,217
Protected Forest 0.97 0.03 2,196,478 2,196,478 0
Managed Pervious/Landscaping 2.48 1.07 1,687,041 1,307,177 -379,864
Offsite or Existing Roof 1.18 0.11 0 0
Offsite or Existing Roadway 1.64 0.34 0 0
Offsite or Existing Parking/Driveway/Sidem 1.42 0.18 0 0
Offsite Protected Forest 0.97 0.03 0 0
Offsite Managed Pervious 2.48 1.07 0 0
CUSTOM LAND COVER 1 -II 0
CUSTOM LAND COVER 2 0
CUSTOM LAND COVER 3 0
LAND TAKEN UP BY SCM 1.18 0.11 34,148 34,148
Total (Regulated & UnReg)Area 3,939,116.00 3,939,116.00
Project(Regulated)Area 3,939,116.00 3,939,116.00
,

SCM Characteristics
Stormwater Control Measure (SCM)Characteristics Click here to go to Click here to go to Click here to go back to the
Copy Et Paste VALUES ONLY for
SCM101's Land Cover Data Click here to review Errors Summary Data tos
SNAP v4.2.0 Best Results
- Catchment ID 1 1 1 2 2 2
SCM ID 101 Drai' 102 103 201 202 203
•
Type of SCM We[Pond
1
Hydrologic soil group at SCM location C
SCM Description
` Design Storm Size(inches/24hrs) 1.00
Percent of Full Size 100%
r %Annual Effluent 72% 0% 0% 0% 0% 0%
%Annual Overflow 16% 0% 0% 0% 0% 0%
%Annual ET/Infiltrated 13% 0% 0% 0% 0% 0%
Custom%Annual Effluent
Custom%Annual Overflow
Custom%Annual ET/Infiltrated
SCM Effluent TP EMC(mg/L) 0 0.13 0.00 0.00 0.00 0.00 0.00
SCM Effluent TN EMC(mg/L) 0.86 0.00 0.00 0.00 0.00 0.00
Custom Effluent TP EMC
Custom Effluent TN EMC
SCM Land Cover TP EMC(mg/L) 0.11 0.00 0.00 0.00 0.00 0.00
III SCM Land Cover TN EMC(mg/L) 1.18 0.00 0.00 0.00 0.00 0.00
I. This SCM Drains to Numbered SCM 0 0 0 0 0 0
Catchments Draining to Catchments Draining to Catchments Draining to Catchments Draining to Catchments Draining to Catchments Draining to
Catchment Routing SCM 101 SCM 102 SCM 103 SCM 201 SCM 202 SCM 203
Catchment 1
Catchment 2
Catchment 3
Catchment 4
Catchment 5
Catchment 6
IError Check-Missing SCM Area:
Ir
Error Check-Min/Max Size:
LError Check-Hydrology:
IError Check-Missing SCM Info:
1 Error Check-Drainage Data w/o SCM:
I
Error Checks-SCM Type:
■ SCM ID: 101 102 103 201 202 203
SCM Drainage Area Land Covers Area Draining Directly to Area Draining Directly to Area Draining Directly to Area Draining Directly to Area Draining Directly to Area Draining Directly to
SCM 101(ft2) SCM 102(ft2) SCM 103(ft2) SCM 201(ft2) SCM 202(ft2) SCM 203(ft2)
1
Roof 32,012
Roadway 252,130
Parking/Driveway/Sidewalk 76,103
Protected Forest 0
Managed Pervious/Landscaping 530,786
Offsite or Existing Roof
Offsite or Existing Roadway
Offsite or Existing Parking/Driveway/Sidewalk
Offsite Protected Forest
Offsite Managed Pervious
CUSTOM LAND COVER 1
CUSTOM LAND COVER 2
CUSTOM LAND COVER 3
LAND TAKEN UP BY SCM 34,148
TOTAL AREA DRAINING TO SCM(ft): 925,179 0 0 0 0 0
CATCHMENT AREA(ft): 925,179 0

Nutrient Export Summary SNAP v4.2.0
Landcover Et SCM Data Review
Errors/Advisories Errors/Advisories
Avg Annual precip(in)= 44.68 SCM Area(ft')= 34,148
Total(Regulated+
Unregulated)Area(k�)= 3,939,116 SCM Treated Area(ft2)= 925,179
Project(Regulated)
2 3,939,116 Catchment Routing: No errors
Area(ft)=
Net BUA(Project Area Treating Runoff from
345,716 Net BUA indicates new development or expansion. n0
BUA only ft2)= Existing BUA or Offsite:
Custom Landcovers are
present:
no Disturbed Area(fte)= 1,470,586
Total Nitrogen Export Target 120.31 I Total Phosphorus Export Target 129.31
Scaled to Project Area(Ib/yr): Scaled to Project Area(Ib/yr):
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) before before SCM-Treated SCM-Treated Untreated Untreated
Pre-Project Pre-Project Treatment Treatment after Treatment after Treatment Area Only Area Only Areas Areas
-
Area(All Landcover Types)(acres) 90.4297 90.4297 90.4297 90.4297 90.4297 _ 90.4297 21.2392 21.2392 69.1905 69.1905
Percent Built-Upon Area(BUA)(%) _ 1% 1% 10% 10% 10% 10% 39% 39% 1% 1%
Built-Upon Area(BUA)(sqft) 55,597 55,597 401,313 401,313 401,313 401,313 360,245 I 360,245 41,068 41,068
Annual Runoff Volume(ft3/yr) 827,674 827,674 1,979,027 1,979,027 1,808,053 1,808,053 1,179,211 1,179,211 628,842 628,842
Annual Runoff%Change 139% 139% 118% 118%Total Runoff Change(cuft/yr) 1,151,353 1,151,353 980,379 980,379
Total Nitrogen EMC(mg/L) 1.63 ME= 1.53 1.53 1.14 1.14 0.99 0.99 1.42 1.42
Total Nitrogen Load Leaving Site(lb/yr) 84.19 MEM_ 189.16 189.16 128.42 I 128.42 72.64 72.64 55.77 55.77
Total Nitrogen Loading Rate(Ib/ac/yr) 0.93 WE= 2.09 2.09 1.42 1.42 3.42 3.42 0.81 0.81
Total Nitrogen%Change Pre-to-Post _ 125% 125% 53% 53%
Total Nitrogen Change(Ib/yr)Pm-to-Post 104.98 104.98 44.23 44.23
Total Phosphorus EMC(mg/L) 0.45 0.45 0.32 , 0.32 0.21 0.21 0.16 0.16 0.31 0.31
Total Phosphorus Load Leaving Site(Ib/yr) 23.33 23.33 39.31 39.31 24.19 24.19 12.07 12.07 12.12 I 12.12
Total Phosphorus Loading Rate(Ib/ac/yr) 0.26 0.26 0.43 0.43 0.27 0.27 0.57 0.57 0.18 0.18
Total Phosphorus%Change Pm-to-Post 68% 68% =rIZ= 4%
Total Phosphorus Change(Ib/yr)Pre-to-Post I 15.98 15.98 0.86 0.86
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) (lbs/ac/yr)
Catchment 1 12.66% I 45.54% 55.60% 3.42 0.57 II Nitrogen II Phosphorus
101:Wet Pond 12.66% 45.54% 55.60% 3.42 0.57 Onsite%Reduction Requirement
102:NA _ 0.00% 0.00% _ 0.00% 0.00 _ 0.00 Export Target Scaled to Area(Ib/yr) 129.31 129.31
103:NA 0.00% 0.00% 0.00% 0.00 _ 0.00 _ Export Load Post-Project Before Treatment 189.16 39.31
Catchment 2 0.00% 0.00% _ 0.00% 0.00 _ 0.00 Total Reduction Need(lb/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(lb/yr)
203:NA 0.00% 0.00% 0.00% 0.00 0.00 Project Area Post-Project After Treatment _ 128.42 24.19
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 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% 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
1

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/nonpoint-source-management/nutrient-offset-information
PROJECT INFORMATION
Applicant Name:1
Project Name: ACC Public Safety Training Center
Project Address:
Date: (mm/dd/yyyy) Development Land Use Type: Institutional
County: Project Activity Type: New Development
Project Area(sqft): 3,939,116 Project Latitude: 0.000000
Post-Project Built-Upon Area%: 10.19% I Project Longitude: 0.000000
WATERSHED INFORMATION
Nutrient Management Watershed: Jordan Lake N Target Export Rate(Ib/ac/yr): 1.43
Subwatershed: Haw_River P Target Export Rate(Ib/ac/yr): 1.43
Nitrogen Delivery Zone: Jordan-030050 Nitrogen Delivery Factor: 64%
Phosphorus Delivery Zone: Jordan-030050 Phosphorus Delivery Factor: 62%
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 I Total TN
TN Untreated TN Treated TN Delivery Offsets Permanent
Load(Ib/yr) Target Load Load(lb/yr) Reduction Factor(%) Required Local Gov't Offsets to
(Ib/yr) Need(Ib/yr) (Ib/yr) Offsets(Ib/yr) Buy(Ib/yr)
189.2 129.3 128.4 0.0 I 64.0% 0.0 0.0
Post-Project Phosphorus Calculations -Projects with No Offsite or Built-Upon Area
(A) (B) (C) (D) (F) (G) (Where
Applicable)
TP Export TP Remaining TP Permanent Additional Total TP
TP Untreated TP Treated TP Delivery Offsets Permanent
Load(Ib/yr) Target Load Load(Ib/yr) Reduction Factor(%) Required Local Gov't Offsets to
(Ib/yr) Need(Ib/yr) (Ib/yr) Offsets(Ib/yr) Buy(Ib/yr)
39.3 129.3 24.2 0.0 62.0% 0.0 0.0
LOCAL GOVERNMENT AUTHORIZATION
Local Government Name:I
Staff Name: Phone:
Staff Email: Date:
Local Government Authorizing Signature: