SW1240201_Supplement-EZ Form_20240227

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name Horsepasture River Wastewater Treatment Plant&Collect
2 Project Area(ac) 16
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 0.99
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) 25
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)? Yes
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 _ 1
15 Permeable Pavement
16 Sand Filter
17 Rainwater Harvesting(RWH)
18 Green Roof
19 Level Spreader-Filter Strip(LS-FS)
20 Disconnected Impervious Surface(DIS)
21 Treatment Swale
22 DryPond
23 Storm Filter
24 Silva Cell
25 Bayfilter
26 Filterra
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title: Scott Burwell
28 Organization: McGill Associates PA
29 Street address: 55 Broad Street
30 City,State,Zip: Asheville,NC 28805
31 Phone number(s): 828-252-0575
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 1
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
C FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site 1
4 Type of SCM Wetland Wetland
5 Total drainage area(sq ft) 697600 164189
6 Onsite drainage area(sq ft) 697600 164189
7 Offsite drainage area(sq ft) N/A N/A
8 Total BUA in project(sq ft) 72410 sf 72410 sf
New BUA on subdivided lots(subject to
9 permitting)(sq ft) N/A N/A
New BUA not on subdivided lots(subject to
10 permitting)(sf)
11 Offsite BUA(sq ft) N/A N/A
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) 324 sf 324 sf
-Sidewalk(sq ft) sf sf
-Roof(sq ft) 7184 sf 7184 sf
-Roadway(sq ft) 59348 sf 59348 sf
-Future(sq ft) 9533 sf 9533 sf
-Other,please specify in the comment box
below(sq ft) 3205 sf 3205 sf
New infiltrating permeable pavement on
13 subdivided lots(sq ft) N/A N/A
New infiltrating permeable pavement not on
14 subdivided lots(sq ft) N/A N/A
Existing BUA that will remain(not subject to
15 permitting)(sq ft) N/A N/A
16 Existing BUA that is already permitted(sq ft) N/A N/A
17 Existing BUA that will be removed(sq ft) N/A N/A
18 Percent BUA 10% 44%
19 Design storm(inches) 1.0 in 1.0 in
20 Design volume of SCM(cu ft) 4790 cf 4790 cf
21 Calculation method for design volume Discrete NRCS Discrete NRCS
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
Other includes equipment pads,process equipment,etc.The wetland has
been designed to account for all of the impervious area on the entire site
(including future BUA),not strictly what is flowing to it.This has created a
more conservative design.

STORMWATER WETLAND
1 Drainage area number
2 Minimum required treatment volume(cu ft)
GEN ERM.MDC FROM 0211.1050 ' ••• -;
3 Is the SCM sized to treat the SW from all surfaces at build-out? '" :Wei I •
4 Is the SCM located away from contaminated soils?
5 What are the side slopes of the SCM(FIN)?
6
Does the SCM have retaining walls,gabion walls or other
• N •
engineered side slopes? O•
Are the Inlets,outlets,and receiving stream protected from erosion .7 yes
(10-year storm)? . .
8 Is there an overflow or bypass for inflow volume in excess of the • •,
.•
design volume?
9 What is the method for dewatering the SCM for maintenance? Drawdown OnTiqe
•
10 if applicable,wilt the SCM be cleaned out after construction?
11 Does the maintenance access comply with General MDC(8)?
12 Does the drainage easement comply with General MDC(9)? .• "Yes •
13 If the SCM is on a single family lot,does(will?)the plat comply with :• 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)? r' Yes
16 Does the SCM follow the device specific MDC?
17 Was the SCM designed by an NC licensed professional? Yes
STORMWATER WETLAND MDC FROM RR.1054 ,*>"'T • -,. I
18 Design volume of SCM(cu ft) 9758
Are the inlet(s)and outlet located in a manner that avoids short- ' yes
19
circuiting?
20 Are berms or baffles provided to improve the flow path?
Does the orifice drawdown from below the top surface of the
21
permanent pool?
22 Does the wetland minimize impacts to the receiving channel from the •
1-yr,24-hr storm? es
. .
23 Is a trash rack or other device provided to protect the outlet system? Yes- .-.• •
ElevadonS . . .
Elevation,peak attenuation above temporary pool(if applicable) •
3193.00 •24(fmsl)
. .
Elevation,temporary pool(top of the temporary inundation zone)
25(fmsl) 3192.00
26 Elevation,permanent pool(top of the shallow water zone)(fmsl) 3190.75
27 Elevation,bottom of shallow water zone(fmsl) 3190.00 :•
28 •Elevation,bottom of forebay deep pool at deepest point(at forebay —
3180.uu
entrance)(fmsl)
Elevation,bottom of forebay deep pool at shallowest point(at
3190.00-
29 forebay exit)(fmsl)
30 Elevation,bottom of non-forebay deep pool at deepest point(fmsl) 3187.50 . •
Mandng Zones
Area,total surface area of the SW wetland at temporary pool elev ' • '
31 8 573.00 — •
(sq ft)
32 Area,temporary inundation zone at temporary pool elev,(sq(t) 2,974.00
33 Area,shallow water zone at temporary pool elev.(sq ft)
34 Area,forebay at temporary pool elev.(sq ft)
35 Area,non-forebay deep pool at temporary pool elev.(sq ft) 1,250.00,
Percent area provided,temporary inundation zone(should be 30
36
45%)
37 Percent area provided,shallow water zone(should be 35-45%) , 39%
38 Percent area provided,deep pool(forebay)(should be 10-15%) 12% •
39 Percent area provided,deep pool(non-forebay)(should be 5-15%) 15%
Depths and Outlet
..
40 Peak attenuation depth above temporary inundation zone(inches) •
Temporary inundation zone depth(temporary pool to permanent .
41 15 in
pool)(inches)
Shallow water zone depth(permanent pool to bottom of wetland) .
42 9 in
(Inches)
Depth,forebay at entrance(permanent pool to bottom of forebay
43 33 in
entrance)(inches)
Depth,forebay at exit(permanent pool to bottom of forebay exit)
9 in
44 (inches)
Depth,non-forebay deep pools(permanent pool to deep pool
45 39 in
bottom)(inches)
46 If there Is an orifice,diameter(inches) 2 in
47 If there is a weir,weir height(Inches) NJA
48 If there is a weir,weir length(inches) • NJA,
Drawdown time for the temporary pool(days) 3

STORMWATER WETLAND
Soil and Plants
50 Soil amendment depth(Inches) N/A
51 Has a soil amendment specification been provided? _ No
52 Has a landscaping plan that meets SW Wetland MDC(12)been Yes
provided?
53 Number of plants per 200 square feet(#)in the shallow water zone:
54 Does the temporary inundation zone planting comply with SW Yes
Wetland MDC(14)?
Are the dam structure and temporary fill slopes planted In non-
55 clumping turfgrass? Yes
66 Will cattails be planted In the wetland? No
ADDITIQNAL INFORMATION' ., ,,. '`'°' ' .. ,
57 Please use this space to provide any additional Information about the
storrnwater wetland(s):
#53(did not allow input):50 plantings per 200sf