20190224 Ver 1_Jordan Falls-LSNL-Accounting tool-030819_20190328

Watershed Characteristics Ver2.0 I Clear All Values I Return to Instructions , I Proceed to RMP Characteristics I Skip to Development Summary
Instructions
1. Select your physiographic/geologic region. (see map on 'instructions' page)
2. Enter the area of the entire development in square feet (ft').
3. Select the location that is most representative of the site's precipitation characteristics. (see map on 'instructions' page)
4. For each applicable land use, enter the total area of that land use that lies within the development under pre -development conditions.
5. For each applicable land use, enter the total area of that land use that lies within the development under post -development conditions, before BMP implementation.
6. Ensure that the sum of pre- and post -development areas entered equal the orginal development area.
7. Continue to "BMP Characteristics" tab.
Additional Guidelines
- For non-residential watersheds, indicate acreages of each land use type in Column 1 for both pre -and post -development conditions.
- For residential watersheds, complete the required information in Column 2 for both pre- and post -development conditions.
If a given land use is not present in the given watershed, leave the cell blank or enter a zero.
Ensure that land use areas entered for both pre -and post -development conditions match the total development area entered in cell 021.
Residential areas may be entered by average lot size (column, part A), or may be separated into individual land uses (column 2, part B) -- do NOT list out individual land uses within an
area already described by lot size.
Unless runoff flowing onto the development from offsite is routed separately around or through the site, the offsite catchment area draining in must be included in the acreage
values of the appropriate land use(s) and treated.
Physiographic/Geologic Region: Piedmont
Soil Hydrologic Group B
Precipitation location: Butner
COLUMN 1 -- NON-RESIDENTIAL LAND USES
COLUMN 2 -- RESIDENTIAL LAND USES
COMMERCIAL
Parking lot
TN EMC
(mg/L)
1.44
TP EMC
(mg/L)
0.16
Pre-
Development
W)
Post -
Development
W)
Roof
1.08
0.15
Open/Landscaped
2.24
0.44
%-ac lots
INDUSTRIAL
Y -ac lots
Parking lot
1.44
0.39
9,907
15,425
Roof
1.08
0.15
23,126
25,350
Open/Landscaped
2.24
0.44
14,625
5,383
TRANSPORTATION
Multi -family
High Density (interstate, main)
3.67
0.43
Townhomes
Low Density (secondary, feeder)
1.4
0.52
Custom Lot Size
Rural
1.14
0.47
PART B
Sidewalk
1.4
1.16
Roadway
Driveway
Parking lot
Roof
Sidewalk/Patio
PERVIOUS
1.4 0.52
1.44 0.39
1.44 0.39
1.08 0.15
1.4 1.16
Lawn
Managed pervious
3.06
0.59
Managed pervious
Unmanaged (pasture)
3.61
1.56
Forest
Forest
1.47
0.25
Natural wetland`
JURISDICTIONAL LANDS'
Riparian buffer`
Open water'
LAND TAKEN UP BY BMPs
Natural wetland
Riparian buffer
Open water
LAND TAKEN UP BY BMPs
1.08
0.15
1,500
'Jurisdictional land uses are not included in nutrient/flow calculations.
Total Development Area (ft'): 47,658
Development Name: Creedmoor - Building C Resin Storage Expa
Model Prepared By: CE
LAND USE AREA CHECK
Total Development Area Entered (ft'): 47,658
Total Pre -Development Calculated Area (ft'): 47,658
Total Post -Development Calculated Area (ft'): 47,658
COLUMN 2 -- RESIDENTIAL LAND USES
Custom
Lot Size Age
(ac) (Yrs)
Pre-
TN EMC TP EMC Development
(mg/L) (mg/L) (ft)
Post -
Development
W)
PART A
%-ac lots
Y -ac lots
Y. -ac lots
1 -ac lots
2 -ac lots
Multi -family
Townhomes
Custom Lot Size
PART B
Roadway
Driveway
Parking lot
Roof
Sidewalk/Patio
1.0
1.4 0.52
1.44 0.39
1.44 0.39
1.08 0.15
1.4 1.16
Lawn
2.24 0.44
Managed pervious
3.06 0.59
Forest
1.47 0.25
Natural wetland`
Riparian buffer`
Open water'
LAND TAKEN UP BY BMPs
1.08 0.15
LAND USE AREA CHECK
Total Development Area Entered (ft'): 47,658
Total Pre -Development Calculated Area (ft'): 47,658
Total Post -Development Calculated Area (ft'): 47,658

BMP Characteristics Vill C-All—
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3. Development Summary
Development: Al- Creedmppr- Building C Resin SWmge Expansion
Prepared By: CE
Dare: March 26, 2019
WATERSHED SUMMARY Ver2.0 BMP VOLUME REDUCTIONS/EFFLUENT CONCENTRATIONS
REGION: Piedmont
TOTAL DEVELOPMENT AREA (ft-): 47,658
Pre-Deyelopmem Conditions
Post De lopmem C .ditbm
ppst4 elopmem w/ BMps
Pe -M Impervious 69.3%
88.7%
88.7%
(%)
0.95
0.12
Annual Runoff Volume 125,614
158,150
130,]95
(U)
Bbretentlon whhout
35%
Total Nltmgen EMC 1.21
1.22
1.09
(mg/L)
Total Nitrogen Loading 8.69
11.00
8.11
(Ib/ac/yr)
Grassed Swale
0%
Total Phosphorus EMC
0.23
0.24
0.13
XL)
1.08
0.15
Total Phosphorus Loading 1.63
2.16
0.97
(lb/aJttl
Strip
Percent Di(/erenm Between:
'Negative percent difkrentt values indicate a decrease in runoRvolume, pollutant cpncenbadon or pollutant loading. Posidve values Indkate an increase.
BMP SUMMARY Ver2.0
Return to lnrtructions
Return to Watershed Characteristic I
Return to BMP Characteristics
Print Summary
Catchment Outflow Nitrogen EMC(mg/L)
Volume Reduction Effluent Con<en.
TPEHluent Concen.
8.05 - -- - - -
IT.
1%)
Img/L)
(mg/L)
Bbretention with
50%
0.95
0.12
IWS
Wtchment Outflow
0.984 - -- - - -
Total Phosphoms (Ib/nm
Bbretentlon whhout
35%
1.00
0.12
IWS
Dry Detemipn pond
o%
1.20
0.20
Grassed Swale
0%
1.21
0.26
Green Roof
50%
1.08
0.15
Level Spdr, Fllter
40%
1.20
0.15
Strip
Permeable
Paw:mear
0%
1.44
0.39
Sand Filter
5%
0.92
0.14
Water Harvesting
user de0ned
1.08
0.15
Wet Detention Pond
10%
1.01
0.11
Wetland
20%
1.08
0.12
Return to lnrtructions
Return to Watershed Characteristic I
Return to BMP Characteristics
Print Summary
Catchment Outflow Nitrogen EMC(mg/L)
1.10 - - - - -
6Uhment Outflow
8.05 - -- - - -
TotalNltrogenllb/ac/tt)
Percent ...wm Nitrogen Load (%)
30% - - - - -
Crtchment 0u 1_Phosphoms EMC
0.135 - -- - - -
(mg/L)
Wtchment Outflow
0.984 - -- - - -
Total Phosphoms (Ib/nm
Percent Reductlon In Phosphorus Load (%)
58% - -- - - -