SW5231201_Supplement-EZ Form_20240101

SAND FILTER
1 Drainage area number 1
2 Minimum required treatment volume(cu ft) 4839 sf
`NERAL MDC FROM 02H.1050
3 Is the SCM sized to treat the SW from all surfaces at build-out? Yen
4 Is the SCM located away from contaminated soils? No
5 What are the side slopes of the SCM(H:V)? 3:1
6 Does the SCM have retaining walls,gabion walls or other engineered Yes
side slopes?
7 Are the inlets,outlets,and receiving stream protected from erosion Yes
(10-year storm)?
8 Is there an overflow or bypass for inflow volume in excess of the Yes
design volume?
9 What is the method for dewatering the SCM for maintenance? Drawdown Orifice
10 If applicable,will the SCM be cleaned out after construction? Yes
11 Does the maintenance access comply with General MDC(8)?
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
13 N/A
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 the SCM designed by an NC licensed professional? Yes
SAND FILTER MDC FROM 02H.1056
18 SHWT elevation(fmsl) N/a
19 Type of sand filter(open or closed) 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? No
Sediment Chamber
23 Volume that can be retained in the sediment chamber(cubic feet) 1000 cf
24 Will there be a permanent pool in the sediment chamber? No
25 Bottom of the sediment chamber(fmsl) 303.00
26 Area of the sediment chamber(square feet) 267 sf
27 Physical depth of the sediment chamber(inches) 30 in
28 Ponding depth in the sediment chamber,above any permanent pool 30 in
(inches)
29 Elevation of top of weir between chambers(fmsl) I 305.5
Sand Chamber
30 Volume that can be retained in the sand chamber(cubic feet)
31 Bottom of the sand chamber(fmsl) 303.00
32 Area of the sand chamber(square feet) 570 sf
33 Physical depth of the sand chamber(inches) 30 in
34 Ponding depth in the sand chamber,above the sand surface 12 in
(inches)
35 Elevation of the bypass device(fmsl) 305.5
36 Type of bypass device spillway
37 Mechanism for distributing flow over the sand surface Gravity
38 Sand specification for sand chamber I C-33
39 Depth above underdrain pipe(inches) [ 30 in
40 Will the media be maintained to drain at least two inches per hour at Yes
the sand surface?
41 Is at least one clean-out pipe provided at the low point of each Yes
underdrain line? _
42 Will clean-out pipes be capped? Yes
ADDITIONAL INFORMATION
43 Please use this space to provide any additional information about the
sand filter(s):
2

DRY POND
1 Drainage area number 1
2 Minimum required treatment volume(cu ft) 15000 cf
GENERAL MDC FROM 02H.1050
3 Is the SCM sized to treat the SW from all surfaces at build-out? Yco
4 Is the SCM located away from contaminated soils? No
5 What are the side slopes of the SCM(H:V)? 3:1
6 Does the SCM have retaining walls,gabion walls or other Yes
engineered side slopes?
7 Are the inlets,outlets,and receiving stream protected from erosion Yes
(10-year storm)?
8 Is there an overflow or bypass for inflow volume in excess of the Yes
design volume?
9 What is the method for dewatering the SCM for maintenance? Drawdown Orifice
10 If applicable,will the SCM be cleaned out after construction? Yes
11 Does the maintenance access comply with General MDC(8)?
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
13 N/A
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 the SCM designed by an NC licensed professional? Yes
DRY POND MDC FROM 02H.1062
18 SHWT elevation(fmsl) N/A
19 Elevation of the bottom of the dry pond(fmsl) 303
20 Distance from bottom to SHWT(feet) N/A
21 Elevation of the temporary pool during the design storm(feet) 305.85 ft
22 Ponding depth of the design storm(feet) 2.85 ft
23 Will the dry pond be uniformly graded to flow toward the outlet? Yes
24 Is a low flow channel being provided? No
25 Are the inlet(s)and outlet located in a manner that avoids short- Yes
circuiting?
26 Will berms or baffles be provided to increase the flow path? No
27 What method of pretreatment will be provided? FOREBAY
28 Design volume of SCM(cu ft) 17097
29 Diameter of drawdown orifice(in) 1 in
30 Drawdown time for the temporary pool(hours) 47
31 Does the pond minimize impacts to the receiving channel from the 1- Yes
yr,24-hr storm?
32 Is there a small permanent pool near the orifice to prevent clogging? No
33 Will the outlet be designed to prevent clogging? Yes
34 Are the dam and embankment planted in non-clumping turf grass? Yes
35 Species of turf that will be used on the dam and embankment
36 Will trees and shrubs be prevented from growing on the dam and Yes
embankment?
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
37 dry pond(s):
2