SW4200301_Supp EZ_3/18/2020

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1
Project Name Haw Village Phase 2
2
Project Area ac
27.31
3
Coastal Wetland Area ac
0
4
Surface Water Area ac
0
5
Is this ro'ect High or Low Density?
Low
6
Does this project use an off -site SCM?
No
WITH D2H .'1003(4)
!Width of vegetated setbacks provided (feet)
r1G,OMPLIANCE
IWillthe ve etated setback remain ve etated?
Is BUA other that as listed in .1003(�(c=d out pf the setback?
Yes
I Is streambank stabilization proposed on this project?
No
NUMBER AND TYPE OF SCMs:
11
Infiltration System
0
12
Bioretention Cell
0
13
'Wet Pond
0
14
Stormwater Wetland
0
15
Permeable Pavement
0
16
Sand Filter
0
17 Rainwater Harvesting RWH
0
18 Green Roof
0
19 ;Level Spreader -Filter Strip LS-FS
0
20
IlDisconnected Impervious Surface (DIS)
0
21
,Treatment Swale
0
22
1Dry Pond
0
23
StormFilter
0
24
-Silva Cell
0
25
Bayfilter
0
26
Filterra
0
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title: Thomas S _eight, PE
28 Or anization: Bateman Civil Survey Company
29 IStreet address: 2524 Reliance Avenue
Phone number(s): 919-577-1080
Email: tomrdhatemandvilsumavrmm_ 1_amnoerr
Certlflralior Slatilnlenl,
I certify, under penalty of law that this Supplement-EZ form and all supporting information were prepared under my direction or
supervision; that the information provided in the form is, to the best of my knowledge and belief, true, accurate, and complete; and
that the engineering plans, specifications, operation and maintenance agreements and other supporting information are consistent
with the information provided here.
nurlrr
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SEAL.
202343s�
N a I-tJti. Gyp' •"
Signature of Designerf
Date

DRAINAGE AREAS
1 ; Is this ahiqh densi ro'ect? No
2 ' If so, number of drainage areas/SCMs 1
i Is all/part of this project subject to previous rule
3 aversions? No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
4
Type of SCM
5
Total BUA in project (sq ft
196560 sf
6permitting)
New BUA on subdivided lots (subject to
s ft
154000 sf
7permitting)
New BUA outside of subdivided lots (subject to
s
42560 sf
8
Offsite - total area (sq ft)
sf
9
Offsite BUA (sq ft)
sf
10
. Breakdown of new BUA outside subdivided lots:
Parking (sq ft
56000 sf
Sidewalk (sq ft
sf
Roof (sq ft
98000 sf
- Roadway s ft
42560 sf
Future (sq ft
sf
Other, please specify in the comment box
Ibelow (sq ft
sf
11
New infiltrating permeable pavement on
;subdivided lots s ft
sf
12
New infiltrating permeable pavement outside of
subdivided lots (sq ft
sf
13permitting)
Exisitng BUA that will remain (not subject to
s ft
sf
14
Existing BUA that is already permitted (sq ft
sf
15
Existin BUA that will be removed s ft
sf
16
Percent BUA
17%
17
IDesign storrn inches
7in
18 Design volume of SCM cu ft
19 :Calculation rnethad for design volume
ADDITIONAL INFORMATION
'Please use this space to provide any additional Information about the
20 drainage area(s):
This is a low density development and was evaluated as a single drainage
area.

LOW DENSITY
DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H .1003
1
Is project below density thresholds set forth in the applicable stormwater rule?
Yes
2
Does project maximize dispersed flow and minimize channelization of flow?
Yes
3
Has the use of piping been minimized per .1003(2)(c)?
Yes
4
Side slopes of the vegetated conveyances (H:V)
-3-sf- 3:1
5
Maximum velocity in the vegetated conveyances during the 10-year storm?
5.53 ftls
6
I.Are curb outlet swales proposed?
No
7
Maximum longitudinal slope of curb outlet swale(s) (%)
8
Bottom width of curb outlet swale(s) (feet)
9
Maximum side slope of curb outlet swale(s) (H:V)
10
Minimum length of curb outlet swale(s) (feet)
11
Are treatment swales used instead of curb outlet swales?
12
Is stormwater released at the edge of the setback as dispersed flow?
Yes
13
Have stormwater outlets been designed to prevent downslope erosion?
Yes
14 Are variations to rule .1003 proposed? No
ADDITIONAL INFORMATION
15 Please use this space to provide any additional information about this low density project;
The project area has a ridge near the center of the project, the site generally drains away from the center towards the property boundary.
This pattern will remain. The roads are located along the ridge and most of the site will continue to drain towards the property boundary.
The roadside ditches will only capture runoff from the ROW and a small portion of front yards that may drain towards the street. Lot
grading will be minimized because the lots will have individual on -site septic systems. _ 1