SW3241101_Supplement-EZ Form_20241118

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name MCCOY FARM
2 Project Area(ac) 61.68
3 Coastal Wetland Area(ac)
4 Surface Water Area(ac) 2.73
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 AND ENGINEER
28 Organization: DPR DESIGN(NC C-650)
29 Street address: 919 BERRY HILL 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
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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
4 Type of SCM SAND FILTER SAND FILTER
5 Total drainage area(sq ft) 2686781 1128204 274428
6 Onsite drainage area(sq ft) 2686781 1096504 271428
7 Offsite drainage area(sq ft) N/A 31700 3000
8 Total BUA in project(sq ft) 581792 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) 151792 sf 121130 sf 30662 sf
11 Offsite BUA(sq ft) N/A 31700 sf 3000 sf
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) sf sf sf
-Sidewalk(sq ft) 31000 sf 24738 sf 6262 sf
-Roof(sq ft) sf sf sf
-Roadway(sq ft) 84600 sf 67511 sf 17089 sf
-Future(sq ft) 25000 sf 19950 sf 5050 sf
-Other,please specify in the comment box
below(sq ft) 11192 sf 8931 sf 2261 sf
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)
17 Existing BUA that will be removed(sq ft) 78400 sf 62563 sf 15837 sf
18 Percent BUA 19% 44% 44%
19 Design storm(inches) 1.0 in 1.0 in 1.0 in _
20 Design volume of SCM(cu ft) N/A 32083 cf 7804 cf
21 Calculation method for design volume N/A Simple Method Simple Method 4
DDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):

SAND FILTER
1 Drainage area number 1 2
2 Minimum required treatment volume(cu ft) 32083 sf I 7804 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 Yes Yes
design volume?
9 What is the method for dewatering the SCM for maintenance? _ Pump(preferred) Pump(preferred_
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
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
18 SHWT elevation(fmsl) 589 608
19 Type of sand filter(open or closed) Open Closed
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) 31775 cf 6050 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) _ 23900 sf 7350 sf
27 Physical depth of the sediment chamber(inches) 16 in 12 in
28 Ponding depth in the sediment chamber,above any permanent pool
(inches)
29 Elevation of top of weir between chambers(fmsl) 597 613.5
Sand Chamber
30 Volume that can be retained in the sand chamber(cubic feet) 18515 cf 3975 cf
31 Bottom of the sand chamber(fmsl) 592.50 609.00 _
32 Area of the sand chamber(square feet) 8050 sf 2650 sf
33 Physical depth of the sand chamber(inches) _ 58 in 48 in
34 Ponding depth in the sand chamber,above the sand surface 28 in 18 in
(inches) _
35 Elevation of the bypass device(fmsl) 597.3 613 _
36 Type of bypass device Oriface Orifiace _
37 Mechanism for distributing flow over the sand surface _ Rip-Rap Berm Rip-Rap Berm _
38 Sand specification for sand chamber ASTM-33 Medium ASTM-33 Medium
39 Depth above underdrain pipe(inches) _ 16 in 16 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):
Concerning#10:both SCMs will be converted from E&SC basins to Sand
Filters when the E&SC stages end. This will include a complete basin
restoration and cleanout as necessary. SCM#2 is a Closed Bottom SCM
utilizing an impermeable liner due to the SHWTE. It does not utilize
concrete,and it is open at the top.
Sand Filter 1 9:46 AM 10/24/2024