SW3230701_Supplement-EZ Form_20240223

,SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name Stewart's Grove
2 Project Area(ac) 18 41
3 Coastal Wetland Area(ac) 0 _
4 Surface Water Area(ac) 0 58
5 _Is this p ject High or Low Density? High _, . _ _ _
8 Does this project use an off-site SCM? No
COMPLIANCE WITH1.02H'.1003(4)
7 Width of vegetated setbacks provided(feet)_ _ 50'
8 i Will the vegetated setback remain vegetated? _ Yes
9 `If BUA is ppposed in the setback,does it meet NCAC 02H.1003(4)(c-d)? NIA
10 Its streambank stabilization proposed on this project? No
;NUMBER AND TYPE OF SCMs:
_11 Infiltration System 0
12 Biorelention Cell 0 _
13 Wet Pond 0
14 LStormwater Wetland 0
15 'Permeable Pavement 0
16 'Sand Filter 2
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 Day Pond 2
23 StormFiller ` 0
24 Silva Cell 0
25 Bayfilter -
26 Filterra 0
FORM LOADED
DESIGNER CERTIFICATION •
27 Name and Title: Jack McFadden PE
28 Organization: Thomas&Hutton
29 Street address: 1020 Euclid Ave
30 City,State,Zip. Charlotte NC 28203
31 Phone numberO: [phone]
32 Email mcfadden j@tandh corn
CerJfi atlor 5:a!ement
I certify under penalty of taw 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 _ 2
3 Does this project have low density areas? _ No
4 If so,number of low density drainage areas _
Is all/part of this project subject to previous rule
5 versions? No
CLICK TO LOAD FORM

SAND FILTER
1 Drainage area number 4 5 I
2 Minimum required treatment volume(Cu ft) 14776 sf 1729 sf
GENERAL MDC FROM 02H.1050
3 Is the SCM sized to treat the SW from all surfaces at build-out? Yen Ye:,
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? Drawdown Orifice Drawdown Orifice
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 N/A N/A
General MDC(10)?
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)
19 Type of sand filter(open or closed) Closed Closed
20 If closed,will the filter will be pre-cast or pour-in-place?
21 If closed,top of grate elevation(fmsl) 534 537
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) 7200 cf 800 cf
24 Will there be a permanent pool in the sediment chamber? No No
25 Bottom of the sediment chamber(fmsl) 532.50 535.50
26 Area of the sediment chamber(square feet) 3600 sf 400 sf
27 Physical depth of the sediment chamber(inches) 18 in 18 in
28 Ponding depth in the sediment chamber,above any permanent pool 24 in 24 in
(inches)
29 Elevation of top of weir between chambers(fmsl) 539.5 539.5
Sand Chamber
30 Volume that can be retained in the sand chamber(cubic feet) 7800 cf 1000 cf
31 Bottom of the sand chamber(fmsl) 532.50 535.50
32 Area of the sand chamber(square feet) 3900 sf 500 sf
33 Physical depth of the sand chamber(inches) 18 in 18 in
34 Ponding depth in the sand chamber,above the sand surface 24 in 24 in
(inches)
35 Elevation of the bypass device(fmsl) 539.5 539.5
36 Type of bypass device Emergency Emergency
Spilllway Spillway
37 Mechanism for distributing flow over the sand surface Natural Flow Natural Flow
38 Sand specification for sand chamber ASTM C33 or ASTM C33 or
equivalent equivalent
39 Depth above underdrain pipe(inches) 18 in 18 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):
20)Filter installation type to be determined by contractor
2

DRY POND
1 Drainage area number 4 5
2 Minimum required treatment volume(cu ft) 14776 sf 14776 sf
GENERAL MDC FROM 02H.1050
3 Is the SCM sized to treat the SW from all surfaces at build-out? No No
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 dewatering the SCM for maintenance? Drawdown Orifice Drawdown Orifice
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
13 If the SCM is on a single family lot,does(will?)the plat comply with N/A N/A
General MDC(10)?
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? No No
17 Was the SCM designed by an NC licensed professional? Yes Yes
DRY POND MDC FROM 02H.1062
18 SHWT elevation(fmsl)
19 Elevation of the bottom of the dry pond(fmsl) 534 537
20 Distance from bottom to SHWT(feet)
21 Elevation of the temporary pool during the design storm(feet) 539.54 ft 539.31 ft
22 Ponding depth of the design storm(feet) 5.54 ft 2.31 ft
23 Will the dry pond be uniformly graded to flow toward the outlet? No No
24 Is a low flow channel being provided? No No
25 Are the inlet(s)and outlet located in a manner that avoids short- Yes Yes
circuiting?
26 Will berms or baffles be provided to increase the flow path? No No
27 What method of pretreatment will be provided? Forebay Forebay
28 Design volume of SCM(cu ft) 71,882.91 11,148.33
29 Diameter of drawdown orifice(in) 6 in 6 in
30 Drawdown time for the temporary pool(hours) _ N/A N/A
31 Does the pond minimize impacts to the receiving channel from the 1- Yes Yes
yr,24-hr storm?
32 Is there a small permanent pool near the orifice to prevent clogging? No No
33 Will the outlet be designed to prevent clogging? Yes Yes
34 Are the dam and embankment planted in non-clumping turf grass? Yes Yes
35 Species of turf that will be used on the dam and embankment fescue/centipede fescue/centipede
blend _ blend
36 Will trees and shrubs be prevented from growing on the dam and Yes Yes
embankment?
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
37 dry pond(s):
In this design,both dry ponds will be acting as secondary SCMs in direct
connection with one of the two sand filters,which will be acting as the
design's primary SCM
16)MDC 8,we do not have a small permanent pool for the above reasoning.
2