SW5230802_Supplement-EZ Form_20231222

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name Chatham Habitat for Humanity
2 Project Area(ac) 3.12
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 0
5 Is this project High or Low Density? High
6 Does this project use an off-site SCM? No
'COMPLIANCE WITH 02FI.1003(4)
7 Width of vegetated setbacks provided(feet) 30
8 Will the vegetated setback remain vegetated? Yes
9 If BUA is proposed in the setback,does it meet NCAC 02H.1003(4)(c-d)? N/A
10 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 Disconnected Impervious Surface(DIS) 0
21 Treatment Swale 0 _
22 Dry Pond 1
23 StormFilter 0
24 Silva Cell 0
• 25 Bayfilter ..--. ,. - 0 26 Filterra 0
FORMS LOADED
DESIGNER CERTIFICATION - - - -
27 Name and Title: - Robert W.Brantly,P.E.-Consulting Engineer
28 Organization: Engineering&Environmental Science Company
29 Street address: 3008 Anderson Dr.Ste.102
30 City,State,Zip: Raleigh,NC 27609
31 Phone number(s): 919-781-7798
32 Email: e2s( bellsouth:nel
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 project? Yes
2 If so,number of drainage areas/SCMs 1
3 Does this project have low density areas? No
4 If so,number of low density drainage areas 0
Is all/part of this project subject to previous rule
5 versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site 1
4 Type of SCM Dry Detention Dry Detention
5 Total drainage area(sq ft) 135907 465656
6 Onsite drainage area(sq ft) 135907 135907
7 Offsite drainage area(sq ft) 0 329749
8 Total BUA in project(sq ft) 28583 sf 84301 sf
New BUA on subdivided lots(subject to permitting)
9 (sq ft) 19200 sf 19200 sf
New BUA not on subdivided lots(subject to
10 permitting)(sf) 9383 sf 9383 sf
11 Offsite BUA(sq ft) sf 55718 sf
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) 6918 sf 6918 sf
-Sidewalk(sq ft) 2465 sf 2465 sf
-Roof(sq ft) sf sf
-Roadway(sq ft) sf sf
-Future(sq ft) sf sf
-Other,please specify in the comment box
below(sq ft) sf sf
New infiltrating permeable pavement on
13 subdivided lots(sq ft) sf sf
New-infiltrating permeable pavement not on ---- ---
14 subdivided lots(sq ft) - sf --- sf
Existing BUA that will remain(not subject to �_.
15--permitting)(sq ft) — sf_ —sf
16 Existing BUA that is already permitted(sq ft) sf sf
17 Existing BUA that will be removed(sq ft)- 3280 sf 3280 sf
18 Percent BUA 19% 18% -
19 Design storm(inches) - 3.0 in
20 Design volume of SCM(cu ft) 25995 cf
21 Calculation method for design volume SCS
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
Entire Site only includes the Total Property Area/Project Area.Column'1'
includes the off-site and future off-site Impervious that was used to design the
Dry Detention Basin.etc.)

DRY POND
1 Drainage area number 1
2 Minimum required treatment volume(cu ft) 25995 cf
GENERAL MDC FROM 02H.1050
3 Is the SCM sized to treat the SW from all surfaces at build-out? _ Yes
4 Is the SCM located away from contaminated soils? Yes
5 What are the side slopes of the SCM(H:V)? 3:1
6 Does the SCM have retaining walls,gabion walls or other engineered No
side slopes?
Are the inlets,outlets,and receiving stream protected from erosion
7 Yes
(10-year storm)?
8 Is there an overflow or bypass for inflow volume in excess of the No
design volume?
9 What is the method for dewatering the SCM for maintenance? Pump(preferred)
10 If applicable,will the SCM be cleaned out after construction? Yes
11 Does the maintenance access comply with General MDC(8)? Yes
12 Does the drainage easement comply with General MDC(9)? Yes
13 If the SCM is on a single family lot,does(will?)the plat comply with N/A
General MDC(10)?
14 Is there an O&M Agreement that complies with General MDC(11)? Yes
15 Is there an O&M Plan that complies with General MDC(12)? - Yes
16 Does the SCM follow the device specific MDC? Yes
17 Was the SCM designed by an NC licensed professional? Yes_
DRY POND MDC FROM 02H.1062
18 SHWT elevation(fmsl) 609
19 Elevation of the bottom of the dry pond(fmsl) 612
20 Distance from bottom to SHWT(feet) 3 ft
21 Elevation of the temporary pool during the design storm(feet) 614 ft
22 Ponding depth of the design storm(feet) 2 ft
23 Will the dry pond be uniformly graded to flow toward the outlet? Yes
24 Is a low flow channel being provided? No
25 Are the inlet(s)and outlet located in a manner that avoids short- Yes
circuiting?
26 Will berms or baffles be provided to increase the flow path? No
27 What method of pretreatment will be provided? Class B EC Stone
---28 Design volume ofSCM(cu ft) — 25995
29 Diameter of drawdown orifice(in) 4 in
_30 Drawdown time for the temporary pool(hours) ... .. _.. _ -____ 55_
31 Does the pond minimize impacts to the receiving channel from the 1- Yes
yr,24-hr storm?
32 Is there a small permanent pool near the orifice to prevent clogging? Yes
33 Will the outlet be designed to prevent clogging? Yes
34 Are the dam and embankment planted in non-clumping turf grass? - - - Yes .— -
35 Species of turf that will be used on the dam and embankment Rye
36 Will trees and shrubsbe prevented from growing on the dam and Yes -
embankment?
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
37 dry pond(s):
Dry Pond 1 1:24 PM 12/22/2023