SW4211101_Supplement-EZ Form_20211109

Green Mountain Engineering, PLLC Civil Engineering Consultants
To: Jim Farkas
Address: 512 N. Salisbury St. Office 640E, Raleigh, NC 27604
From: Jordan D. Young, PE, Green Mountain Engineering, PLLC
Date: 2021-November- 4
Re: Barrow Farms Phase 1 & 2
Messages
Jim,
Attached please two sets of plans for the Barrow Farms Subdivision, one copy of the
original signed Supplemental-EZ form, one copy of the original signed channel and
density calculations and one check for $505.
Please let me know if you require additional information, I can be reached via email
Jordan(& rg eenmountainengiineers.com or by telephone [phone]) at your convenience.
Sincerely,
Jordan D. Young, PE
7A Wendy Court - Greensboro, NC 27409 - [phone]
Page 1 of 1

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name
i �—.. Barrow Farms
------------
2 Project Area (ac) -- f 341
3 Coastal Wetland Area (ac) 0
4 Surface Water Area (ac) _ _.0
5 ds thi- s �ro�ect Hi6h or Low Density?_ _ _ _ _ Low
6 Does this project use an off -site SCM? No
NUMBER AND TYPE OF SCMs:
11 Infiltration System-
12 Bioretention Cell
------- ----------------
13 Wet Pond
14
Stormwater Wetland
15
Permeable Pavement
16
Sand Filter
17
Rainwater Harvesting�RWW)
18
19
Green Roof
Level Spreader -Filter Strip--(LS-Fq_..—_--
20
Disconnected Impervious Surface (DIS)
21
Treatment Swale
23
+Silva
StormFilter
24
Cell
25
Bayfiiter
FORMS LOADED
DESIGNER CERTIFICATION
e and Title: JORDAN D. YOUNG, P.E.
_ _
T
nization:
---_ ....._-__
GREEN MOUNTAIN ENGINEERS, PLLCet
address:
7A WENDY CT
State, Zi
. _. _ p------------� --.
GREENSBORO NC 27409 11
_
31
Phone numbers):
336 294-9394 1
32
Email:
J 0 R AN@GREENMOUNTXINENGINEERS CO
Certification Statement:
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_
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DRAINAGE AREAS
1
Is this a high density pLoject?
No M_
2
If so, number of drainage areasISCMs
� 0
3
Does this Proiect have low density areas?
.�
Yes
4 m_
If so, number of low density drainage areas
_ ^1
5
Is all/part of this project subject to previous rule
versions?
tNo
FORMS LOADED
r6RAINA'GIE,AREA INF—OR MAt10N ,���,� En6re Site ��_LD 1
4
Type of SCM�
NIA
5
Total drainage area (sq ft
40.47 _
6
Onsite drainage area (sq ft
^ 3_41�` M� m
7
Offsite drainage areas ft)�
6.37
8
Total BUA in project (sq ft)
185414 sf
New BUA on subdivided lots (subject to permitting)
9
sc] ft�
118919 sf
New
BUA not on subdivided lots (subject to
10permitting)
65776 sf
11
Offsite BUisgft�
12
113rekdown of new BUA not on subdivided lots:
- Parking (sqftft
- oof s ft)
-
Roadway (sq ft)_
-
other, please specify in the comment box
below
(sq ft)
----_-;:_.____
-
New
infiltrating permeable pavement on
13
subdivided
lots ft
New infiltrating permeable pavement not on
_
14
sub droided lots Le!tZ_.__..___._..__._ ___.__r
_
Existing BUA that will remain (not subject to
15
ermiltin��sg ftZ___ _
16
Existing BUA that is already rmitted (sq ft
17
Existing BUA that will be removed
18
Percent BUA
19
Design storm (inches)
�- NIA ___....
20
Design volume of Sj (cu ft)
NIA
21
Calculation method for design volume
N/A
INFORMATION
IADDMONAL
_ _.._ _._.______ __.._..._-____.__ ._.._ _ .._ ._-..—_ _._____:
`Please use this space to provide any additional information about the
22
drainage a__,_)____�_ _
33 LOT SINGLE FAMILY SUBDIVISION

LOW DENSITY
DE5IGN.REOUIREMENTS FOR LOW DENSITY PROJECTS FROM 112H ]003
- 1
2
Is pr 'ect below density thresholds set forth in the appficable stormwater rule?
�o -_ _ __._ - __ ___._.._..
Does project maximize dispersed flow and minimize channelization of flow?
Yes
_._...._...._...__
Yes
3
Has the use of piping been minimized per .1003(2)(c)?
-- - -- -- - -
Yes
4
- ---- - ---- --
Side slopes of the vegetated conveyances (H:V)
_- ..... ,.......
sf
Maximum velocity in the vegetated conveyances during the 10-year stone?
1.21
_5
6
7
_
Are curb outlet swales proposed? - �-
_ Maximum longitudinal slope of curb outlet swale(s) (°,b)-__---
No
8
9
Bottom width of curb outlet swale(s) (feet)
Maximum side slope of curb outlet swede(s) (H:V)
10
- Minimum length of curb outlet swale(s)Afeet) ---- - _ ---
11
Are treatment swales used instead of crab ouflet swales?
12
is stormwater released at the edge of the setback as dispersed flow?
JN.
13
Have stormwater outlets been designed to prevent downslope erosion?14 Lt
Are vadadons to rule .1003 proposed?
ADDITIONAL INFO
RMATION
15 Please use this space to provide any additional information about this low density project:
- . _... _. .. --- - -- - - -- - ---- - _ - _. ._- , - - - — - --- _.
The project mainly consists of roadside swales that conveys the stormwater runoff. The applicant is proposing minimal stormwater
piping only where necessary to cross under roads while avoiding utilifies then daylights to discharge said collected stormwater.
These few discharge points are then conveyed through vegetated areas that are greater than 100 feet in length to meet the
Swale
#_(ac)
Drainage pervious
Area BUA area D Q Slope V,�_
(cfs) (%) (fps)
� V., Flow depth
i (ips) (ft)
1
0.55
t 015
0.40
0.65
-
2 40
2.30 0.61
_ „D 61 0.86
. --
2
030
010
0.20
065
128
i 120 041
041 j073
i(
3
M_ 1 t36
0.32
-
1.54
j- 0.65
1 8.06
-
j 6.20 1 12_
)
1.12 �t 1.57
4
2 93
0 55
2 38
0 65
_
12 70
4 50 i 27
I 121 1.57
L
5
065
029
fI
036
.
065
2 6
430 i 081
081 { 080
6
7
9
10
11
12
13
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-
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-
14
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18
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211
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