SW3141103_Supplement-EZ Form_20240416

SUPILEMENT-EZ COVER PAGE
rI ORMS lr)AQ:Q
PROJECT INFORMATION
1 !Project Name Agility-Building Expansion
2 Protect Area-(cc) 32.5486
3 Coastal Wetland Area Lac)
4 Surface Water Area(ac)
5 Is this_projiect High or Low Density? High
6 O es this project use an off-site SCM? No
COMPLIANCE WITH 02H1:1003(4)._�
7 W dth of vegetated setbacks provided(feet) - - -
t_
__8 Will the vegetated setback remain vegetated? _ NIA
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? I No
NUMBER AND TYPE OF SCMs:
11 Infiltrat on System a _
12 Bioretention Cell
13 Wet Pond
14 Stormwater Wet and _ N+
15 Permeable Pavement
16 Sand Filter 2
IIRainwater Harvesting(RWH)
Green Roof
19 Level S.reader-Filter Stri. LS-FS
20 Disconnected Impervious Surface(DIS)
21 Treatment Swale
i
22 Dry Pond — _
_23 StormFilter
24 'Silva Cell _
25 B: liter
26 Fillerra -_-
FORMS LOADED
DESIGNER CERTIFICATION
®Name and Title: 1- Carlton T Burton,Principle _
EllOrganization: Burton Engtneerina Associates
Street address: I 5950 Fairview Rd.Suite 100
30 C ,State.Zip. Charlotte,NC 28210
31 Phonenumber(s) 704 533 8881
32 Email_ [e-mail]
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 w th the nformation provided here.
Designer
N01t1t11111111111//#1�'
OI��......,oil,,,,,
.•••OFESS/O. 9
VI
SEAL Signature of Designer
12557
z•
•.F
l N T.13 �;``\`�� ' 20 a
If tl Dale % • d+ 2

DRAMAGE AREAS
1 l Is this a high density project? Yes
2 It so,number of drainage areas/SCMs 2
3 Does this project have low density areas? No
4 It so,number of low density drainage areas 0
1s all/part of this project subject to previous rule
5 versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site 1 2
4 Type of SCM Sandlilter Sandfilter
~5 Total drainage area(sq ft) 127195 1 230868
6 Onsite drainage area(sq ft) 114127 230868
7 Offsite drainage area(sq ft) 13068
8 Total BUA in project(sq ft) I 114127 sf 175547 sf _,
New BUA on subdivided lots(subject to
9 permitting)(sq ft)
New BUA not on subdivided lots(subject to
` 10 permitting)(sf) 1 114127 st 175547 sf
11 Offsite BUA(sq ft)
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) — 54886 sf 116274 sf
-Sidewalk(sq ft) 2573 sf
-Root(sq ft) 56700 sf 56700 sf
-Roadway(sq ft) _
-Future(sq ft) _ ,
-Other,please specify in the comment box
below(sq ft)
New infiltrating permeable pavement on
13 subdivided lots(sq ft)
New infiltrating permeable pavement not on
14 subdivided lots(sq ft) _� _ — +
Existing BUA that will remain(not subject to
15 permitting)(sq ft) _.
16 Existing BUA that is already permitted(sq ft) __._T
17 Existing BUA that will be removed(sq ft) _.
18 Percent BUA 90'0 76°-
19 Design storm(inches) 1.0 in 1.0 in
20 Design volume of SCM(cu ft) _ 7072 cf 17472 cf _
21 Calculation method for design volume Stage Storage Stage Storage
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 ldrainage area(s):

SAN( FILTER
1 Drainage area number _ 1 2
2 Minimum required treatment volume(cu ft) 6818 sf I 10592 sf
RALMDC Mebili2MAN MI. lit
3 Is the SCM sized to treat the SW from all surfaces at build-out? i Yee Yas
4 Is the SCM located away from contaminated soils? _ Yes Yes
•5 What are the side slopes of the SCM(H:V)? _ 3:1_ 3:1
6 Does the SCM have retaining walls,gabion walls or other No No
engineered side slopes? _
7 Are the inlets,outlets,and receiving stream protected from erosion Yes Yes
(10-year storm)?
8 Is there an overflow or bypass for inflow volume in excess of the Yes Yes
design volume? �__
9 What is the method for dewaterin4 the SCM for maintenance? Other Other
10 If applicable,will the SCM be cleaned out after construction? Yes Yes
11 Does the maintenance access comply with General MDC(8)? Yes - Yes
12 Does the drainage easement comply with General MDC(9)? Yes Yes
If the SCM is on a single family lot,does(will?)the plat comply with
13TTGeneral MDC(10)? NIA N/A
14 Is there an O&M Agreement that complies with General MDC(11)? Yes Yes _
15}1 Is there an O&M Plan that complies with General MDC(12)? Yes Yes _
16 Does the SCM follow the device specific MDC? Yes Yes
17t Was the SCM designed by an NC licensed professional? t Yes Yes
NECILTLR MDC FROM Q2NJag
18 SHWT elevation(fmsl) not encountered not encountered
19 Type of sand filter(open or closed) _ Open Open _
20 If closed,will the filler will be pre-cast or pour-in-place?
21 If closed,top of Irate elevation(fmsl) —
22,Is this sand filter designed to attenuate peak flows? Yes i Yes
Sediment Chamber
23 Volume that can be retained in the sediment chamber(cubic feet) 3349 cf 5177 cf
- 24 Will there be a permanent pcol in the sediment chamber? No No
25,Bottom of the sediment chamber(fmsl) 790.00 _ 788.00
26 Area of the sediment chamber(square feet) _ 5986 sf 7639 sf
27 Physical depth of the sediment chamber(inches) _24 in 24 In
28 Ponding depth In the sediment chamber,above any permanent gin 15 in
pool(inches) _
29 Elevation of top of weir between chambers(fmsl) 792 790
Sand Chamber
30 Volume that can be retained in the sand chamber(cubic feet) 3443 cf _ 5410 cf
31 Bottom of the sand chamber ifms' 789.00 — 787 00
32 Area of the sand chamber I scuare leeti 3062 sf — 3944 sf
33 Physical de;Jth of the sand chamber{inches; _ 36 in 36 in
_.
34 Ponding depth in the sand chamber above the sand surface 9 in 15 in
(inches) __
35 Elevation of the bypass device(fmsl) 790.7 — _- 790
36 Type of bypass device nser — riser
37 Mechanism for distributing f ow over the sand surface Rip Rap , R_p Rap
38 Sand specification for sand chamber f C33 C33
39 Depth above underdrain pipe(inches) 18 in _ 18 n
40 Will the media be maintained to drain at least two in:hes per hour at Yes Yes
the sand surface? _
41 Is at least one clean-cut pipe prov ded at the low point of each Yes Yes
underdrain ine?
42 Will clean-out pipes be capped? J Yes Yes
ADDITIONAL INFORMATION
43'
1 Please use this space to prov de any additional information about
i the sand filteqs;7.
Snnc$a otter 3 10:52 AM 2/1/2024