SW5240201_Supplement-EZ Form_20241004

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name Wrenn Farms
2 Project Areac) 30
3 Coastal Wetland Area(ac 0
4 .Surface Water Area(ac) 0.51
5 Is this Droiect High or Low Density? Both High and Low Density
6 Does this project use an off-site SCM? No
COMPLIANCE WITH 02H.1003(4)
7 Width of vegetated sethacks provided(feet) _ 50
8 Will the vegetated setback remain vegetated? Yes
9 If BUA is Dr000sed in the setback,does it meet NCAC 021-1.1003(4)(c-d)? NIA
10 Is streambank stabilization proposed on this project? No
NUMBER AND TYPE OF SCMs:
11 Infiltration System
12 Bioretention Cell
13 Wet Pond 1
14 Stormwater Wetland
15 Permeable Pavement _
16 Sand Filter
17 Rainwater Harvesting(RWH)
18 Green Roof i
19 Level Spreader-Filter Strip(LS-FS)
20 Disconnected Impervious Surface(DIS)
21 Treatment Swale
22 Dry,Pond _
23 Storm Filter
24 JSilva Cell
25 lBavrilter
26 ,Filterra
FORMS WAOED
DESIGNER CERTIFICATION
27 Name and Title_: John R Wadsworth.PE-Project Engineer
28 Organization: Timmons Grout)
29 !Street address: 5410 Trinity Road.Suite 102
30 1 Citv.State,Zip: _ Raleigh,NC 27607
31 Phone number(s): 919-866-4516
32 lEmail. [e-mail]
ertirration 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.
❑esirrner
����(i11 N.lf11l1*�
C A R `a
o a yy.
s Sig t 8signer
r24� SEAL �
r 05's G.
so
I� Date
•-•�,,,+�*WAD 7 09

DRAINAGE AREAS
1 its this a high density project? _ Yes
2 If so number of drainage areas/SCMs f
3 'Does this project have low density areas?
4 If so,number of low density drainage areas I _2 Is all/part of this project subject to previous rule
5 �versians? No
fQLMJ Lgazib
DRAINAC111AREA INFORMATION Entire Site 1 LD 1 LD 2
4 Typq of SCM _ WO P
5 'ToW drainage area wfit _ 3633008 1692117 28749 68825 _
6 :Omsiie drain® area fit 1562932 1E6?932 — — 28749 68824
7 ClUslte drainage areasSp fI} 2268604 29185 NIA N/A
A ITptal BUA in or ct(so 8) _ 577_g31 sf 49179_1 sf 8022 sf 9A11_R sf
New BUA on subdivided lots(subject to permitting),
9 (soft) 201247 sf 201247 sf NIA NIA
New BUA not on subdivided lots(subject to
9n n mnHin.)!f 274784sf 2261359.sf 3297.sf 10128 sf
11 off .SUA R 29185 sf 29185 sf _NIA NIA
12 _Breakdown of new BUA not on subdivided lots., NIA NIA.
Parinnq(s_o_}_t 8712 sf 8712
-Sidewalk fit 37026 sf 37026 sf
-R s€a n1
-Roadway_(sgb _113177 sf 99752 sf. —3297 sf 10128 sf
Future sa ft 115869 sf 115869 sf
Olhlr,please specify in the comment box
brdow Igg hl NIA N/A
New infiltrating permeable pavement on subdividedl
13 lots(sq ft N/A N/A N/ NIA
New infiltrating permeable pavement not on
14__ s!Mivided.lots(sq ft) _ N/A N/A N/A _ _ _ NIA
Existing BUA that will remain(not subject to
15 permittingL(sq ft) N/A N/A NIA NIA
16 Ex1s1L1y�SUA that ie a y�ern1i11ed�s�g 17715 sf N/A 4745of 12990 sf
17 .FXtlnp RUA JIM will be rerrevo A _ N/A WA NIA _ N/A
18 Percent BUA 33% 31% 11% 15%
19 1DsaVstwm flq&sill 1.0in
2q Dgssan volume a(SCM(cu ft 101791 of
21 CWAstlan mathDd for doon viAm Simple Method
ADDITNAL PMFORMAYM
_ZO _
Please use this space to provide any add lull Irrfprm0bpn about the
22 .drainage area(s�'
Drainage area 1 drains to the SCM.The offsite BUA form Wrenn Villas to the
west.This is area is mostly road and right of way that will drain into Wrenn
Farms and be captured and directed to the SCM.Drainage area LD1 and LD2
are low density and drain to POI 2 and POI 3 respectively.

WET POND
1 t7rainage area number I
21 Minimum Mquired treatment volume cult I d7756 d
GENERAL MDC FR6M a2H.305fl
31 Is the SCM sized to treat the SW from all surfaces at build-wO Yes
41 Is the SCM located away.from contaminated soils? Yes
51 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 Yes
7(10-vearstorm)?
Is there an overflow or bypass for inflow volume in excess of the Yes
8 design volume?
9 What is the method for dewaterinq the SCM for maintenance? PumD(preferred)
101 If applicable,will the SCM be cleaned out after construction? Yes
111 Does the maintenance access comply with General MDC(8)? Yes
121 Does the drainage easement comply with General MDC 9? Yes
If the SCM is on a single family lot,does(will?)the plat comply with N/A
13 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 She 8CM de' U.an NC licensed mfessfomal? Yes.
WET PONY f�EfitOM 62M {
18_Sizing method used SAIDA _
19 Has a stage/storage table been provided in the calculations? Yes _
20'Elevation of the excavated main pool depth(bottom of sediment 401.00
emovall ffmsh
211IElevation of the main pool bottom(top of sediment removal)(fmsl) I 402.00
22 Elevation of the bottom of the veoetated shelf(fmsl) 407.00
23 E�yation of the permanent pool(fmsl) 408,00
24 Elevallom of the fop of ftvegetated shelf(fmsl) _ 407.00
25 Elevation of the temoorary Dool(fmsl) 413.00
26 Surface area of the main permanent cool(square feet) 18533
27 Volume of the main permanent pool(cubic feet) 79581 cf
28 Average depth of the main pool(feet) 4.00 ft
29 P arage depth equation used Eouation 2
30 If usina equation 3,main pool perimeter(feet)
31 If using equation 3,width of submerged veq-shelf(feet)
32'Vnh_me-of the foreha (cubic feet �- [ 13988 cf
3211 Is this 15-20%of the volume in the main pool? Yes
34 Clean-out de th for forebav(inches) 12 in
35 Dasipn volume of SCM(cu ft) 101791 Of
3fi Is the outlet an orifice or a weir? Orifice
37 If orifice,orifice diameter(inches) 3 in
34 If weir,weir height(inches)
38 If weir.weir length(inches)
4G Drawdown time for the temoorary pool(days) j 2.8
41 Are the inlet(s)and outlet located in a manner that avoids short- Yes
gctrcuitino?
42 Are herm_s or haf0es provided to improve the flow oath? No
43 Depth of forebav at entrance(inches) 60 in
44 Depth of forebav at exit(inches) 66 in
45 Dnes water flow put of the forebav in a non-erosive manner? Yes
46 Width of the vegetated shelf(feet) 6 ft
47 Slope of veaetated shelf(H:V) [ 6:1
48 Does the orifice drawdown from below the top surface of the No
Derma_nent pool?
49 Does the pond minimize impacts to the receiving channel from the 1_ Yes
vr.24-hr storm?
Are fountains proposed?(If Y,please provide documentation that No
50 MDC(91 is met,)
51 Is a trash rack or other device provided to protect the outlet system? Yes
52 Are the dam and embankment planted in non-clumping turf grass? Yes
53 Species of turf that will be used on the dam and embankment Bermuda
54 Has a nlantino plan been Drovided for the vegetated shelf? Yes
ADE)1'f'fONAL INFORMATION
55
Please use this space to provide any additiwtsl information about the
Walj7omd(3]�
Wet Pond 3 2:46 PM 9/4/2024

WET POND
1 f Drainage area number 1
2'Minimum re aired treatment volume cu ft 47756 d
M
$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
51'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?
7 Are the inlets,outlets,and receiving stream protected from erosion(10. Yes
vear st.rm)?
Is there an overflow or bypass for inflow volume in excess of the Yes
8 design volume?
9 What is the method for dewaterina the SCM for maintenance? Pumo(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
If the SCM is on a single family lot,does(will?)the plat comply with NIA
13 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 _
161 Does the SCM follow the device specific MOMYes l
17 Was the SCM des fined an NC Ilcemed fesslonal? Yes
WEEP RWM02H.1
18 Smog method used SAIDA
19 Hasa stagalst a table been provided in the calculations? Yes
20 Elevation of the excavated main pool depth(bottom of sediment 401.00
removal)ffmsh _
21 Elevation of the main pool bottom(tap of sediment removal)(fmsl) 402.00
22 Elevation of the bottom of the vegetated shelf(fmsl) _ 407.00 _
23 Elevation of the Permanent pool(fmsl) _ 408.00
24 Elevation of the top of the vegetated shelf(fmsl) 407.00
25 Elevation of the temporary pool(fmsl) 413.00.
26 Surface area of the main permanent pool(square feet) 18533
27 Volume of the main permanent pool(cubic feet) 79581 of
28[Averaae denth of the main Pool(feet) 4.00 ft
29 Average depth equation used EauaG�n 22
301 If usin a uation 3,main pool perimeter(feet)
31 If usino equation 3.width of submerqed veq.shelf(feet)
32 Volume of the forebav(cubic feet) 13988 cf
33 Is this 15-20%of the volume in the main pool? Yes
34 Clean-out depth for forebay(inches) 12in
35 Design volume of SCM(cu ft) 101791 of
36 Is the outlet an orifice or a weir? Orifice
37 If orjflice orifice diameter(inches) 3 in
38 If weir,weir height(inches)
39 If weir,weir length(inches)
40 Drawdown time for the temporary pool(days) 2.8
41 Are the inlet(s)and outlet located in a manner that avoids short- Yes
arcuitinq? _
42 Are berms or baffles provided to improve the flow path? No
43 08 of at entrance(inches) 60 in
44 Depth of forebav at exit inches 48 in
45 Does water flow out of the forebay in a non-erosive manner?_ Yes
46 Width of the veqetated shelf(feet) 6 f.
47 Slope of vegetated shelf(H:V) 6:1
48 Does the orifice drawdown from below the top surface of the No
Permanent pool?
49 Does the pond minimize impacts to the receiving channel from the 1- 'Yes
yr.24-hr storm?
Are fountains proposed?(If Y,please provide documentation that No
50 MDC(9)is met,)
51 Is a trash rack or other device provided to protect the outlet system? I Yes
52 Are the dam and embankment planted in non-clumping turf grass? I Yes
55:Species of turf that will be used on the dam and embankment I Bermuda
54 Hl 5. a nlantina plan been Provided_for the vegetated shelf? Yes
ADD TIONA4INFORMATION
55.Please use this space to provide any additional information about the
wet Dond(s):
Wet Pond 7 3:34 PM 9/4/2024