SW3230803_Supplement-EZ Form_20240405

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name MCCOY FARM
2 Project Area(ac) 61.97
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 2.4
5 Is this project High or Low Density? High
6 Does this project use an off-site SCM? No
COMPLIANCE WITH 02H.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
12 Bioretention Cell
13 Wet Pond
14 Stormwater Wetland
15 Permeable Pavement
16 Sand Filter 2
17 Rainwater Harvesting(RWH)
18 Green Roof
19 Level Spreader-Filter Strip(LS-FS)
20 Disconnected Impervious Surface(DIS)
21 Treatment Swale
22 Dry Pond
23 StormFilter
24 Silva Cell
25 Bayfilter
26 Filterra
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title: HY NGUYEN,PRINCIPLE&ENGINEER
28 Organization: DPR DESIGN
29 Street address: 919 BERRYHILL RD.
30 City,State,Zip: CHARLOTTE,NC 28208
31 Phone number(s): 704-340-0641
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 with the information provided here.
Designer
CItiA Irruiiiirrr.
N9.9;
e4 SEAL et
030523 i — Signature of Designer
° !GINEF' ta \�otiR
wino" p
Hy guy 8/12/2022
Seal Date

DRAINAGE AREAS
1 Is this a high density project? Yes
2 If so,number of drainage areas/SCMs 2
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 2
SAND FILTER- SAND FILTER-
4 Type of SCM SAND FILTERS SCM 1 SCM#2
5 Total drainage area(sq ft) 1,402,632 1128204 274428
6 Onsite drainage area(sq ft) 1,367,932 1096504 271428
7 Offsite drainage area(sq ft) 34,700 31700 3000
8 Total BUA in project(sq ft) 581962 sf 495970 sf 120522 sf
New BUA on subdivided lots(subject to permitting)
9 (sq ft) 430000 sf 343140 sf 86860 sf
New BUA not on subdivided lots(subject to
10 permitting)(sf) 151962 sf 121130 sf 30662 sf
11 Offsite BUA(sq ft) 34700 sf 31700 sf 3000 sf
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) sf sf sf
-Sidewalk(sq ft) 33431 sf 24738 sf 6262 sf
-Roof(sq ft) sf sf sf
-Roadway(sq ft) 88137 sf 67511 sf 17089 sf
-Future(sq ft) sf sf sf
-Other,please specify in the comment box
below(sq ft) 30394 sf 23700 sf 6300 sf
New infiltrating permeable pavement on
13 subdivided lots(sq ft) sf sf sf
New infiltrating permeable pavement not on
14 subdivided lots(sq ft) sf sf sf
Existing BUA that will remain(not subject to
15 permitting)(sq ft) sf sf sf
16 Existing BUA that is already permitted(sq ft) sf sf sf
17 Existing BUA that will be removed(sq ft) sf sf sf
18 Percent BUA 36% 44% 44%
19 Design storm(inches) 1.0 in 1.0 in 1.0 in
20 Design volume of SCM(cu ft) 81500 cf 58000 cf 23500 of
Simple Method, Simple Method, Simple Method,
21 Calculation method for design volume Schuler Schuler Schuler
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
Other BUA=Cluster Mailbox and Entry Monuments. Note:Future for HOA
area is part of the OTHER BUA values.

SAND FILTER
1 Drainage area number 1 2
2 Minimum re uired treatment volume cu ft 32083 sf 29162 sf
GENERAL MDC FROM 02H.1050
3 Is the SCM sized to treat the SW from all surfaces at build-out? Yco Yco
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 engineered No No
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 No No
design volume?
9 What is the method for dewatering the SCM for maintenance? Other Other
10 If applicable,will the SCM be cleaned out after construction? N/A N/A
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
13 General MDC(10)? N/A N/A
14 Is there an O&M Agreement that complies with General MDC(11)? Yes Yes
15 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
17 Was the SCM designed by an NC licensed professional? Yes Yes
SAND FILTER MDC FROM 02H.1056 I �
18'SHWT elevation(fmsl) 589 608
19 Type of sand filter(open or closed) _ Open Open
20 If closed,will the filter will be pre-cast or pour-in-place?
21 If closed,top of grate elevation(fmsl) _
22 Is this sand filter designed to attenuate peak flows? Yes Yes
Sediment Chamber
23 Volume that can be retained in the sediment chamber(cubic feet) 25000 cf 6000 cf
24 Will there be a permanent pool in the sediment chamber? No No
25 Bottom of the sediment chamber(fmsl) 596.00 612.00
26 Area of the sediment chamber(square feet) _ 25000 sf 5600 sf _
27 Physical depth of the sediment chamber(inches) 12 in 12 in
28 Ponding depth in the sediment chamber,above any permanent pool
(inches) _
29 Elevation of top of weir between chambers(fmsl) 597 613
Sand Chamber
30 Volume that can be retained in the sand chamber(cubic feet) 21025 cf 10475 cf
31 Bottom of the sand chamber(fmsl) _ 595.00 611.50
32 Area of the sand chamber(square feet) 8050 sf 2650 sf
33 Physical depth of the sand chamber(inches) _ 24 in 18 in _
34 Ponding depth in the sand chamber,above the sand surface 24 in 18 in
(inches)
35 Elevation of the bypass device(fmsl) I 597 613 _
36 Type of bypass device Outlet structure Outlet structure
with Orifice with Orifice. _
37 Mechanism for distributing flow over the sand surface RIP-RAP BERM RIP-RAP BERM
38 Sand specification for sand chamber ASTM C-33 ASTM C-33 _
39 Depth above underdrain pipe(inches) 12 in 12 in
40 Will the media be maintained to drain at least two inches per hour at Yes Yes
the sand surface?
41 Is at least one clean-out pipe provided at the low point of each Yes Yes
underdrain line?
42 Will clean-out pipes be capped? Yes Yes
ADDITIONAL INFORMATION
43 Please use this space to provide any additional information about the
sand filter(s):
SCM#2 only has an impermiable liner to protect against SHWTE infiltration.
Dewater:these are sand filters;there should be no need for dewatering;if
there is a complete failure of the sand media then any excess water would
have to be pumped out;refer to DEWATERING DETAIL on CDs,C3 series.
Sand Filter 1 11:35 AM 4/3/2024