SWA000075_Supplement-EZ Form_20231130

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name Pinnacle Cranes _
2 Project Area(ac) 10
3 Coastal Wetland Area(ac) _ 0
4 Surface Water Area(ac) _ 0
, 5 Is this project High or Low Density? _ High
6 1Does this project use an off-site SCM? No
COMPLIANCE WITH 02H.1003(4)
7 I Width of vegetated setbacks provided(feet) _- 40' __
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 0 -
12 Bioretention Cell 0 _
13 Wet Pond 0
14 Stormwater Wetland 0
15 Permeable Pavement 0 _
16 Sand Filter 1
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 1
22 Dry Pond _ 0
23 StormFilter _ 0 _
24 Silva Cell _ 0
25 Bayfilter 0
26 Filterra 0
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title: Brian Rossi,PE/Project Manager
28 Organization: _ EMH&T
29 Street address: 5500 New Albany Road
30 City,State.Zip: Columbus,Ohio 43054
31 Phone number(s): [phone]
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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Signature of 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 Treatment Swale
5 Total drainage area(sq ft) 451586.52 317029.68 134556.84
6 Onsite drainage area(sq ft) 360197.64 317029.68 43167.96
7 Offsite drainage area(sq ft) 91388.88 0 91388.88
8 Total BUA in project(sq ft) 328094 sf 242542 sf 85552 sf
New BUA on subdivided lots(subject to permitting)
9 (sq ft) 0 sf sf
New BUA not on subdivided lots(subject to
10 permitting)_(sf) 0 sf sf
11 Offsite BUA(sq ft) 77667.48 sf 77667 sf
12 Breakdown of new BUA not on subdivided lots: 0
-Parking(sq ft) 224913.565 224914 sf sf
-Sidewalk(sq ft) 0 sf sf
-Roof(sq ft) 17628.515 17629 sf sf
-Roadway(sq ft) 7884.36 sf _ 7884 sf
-Future(sq ft) 0 __sf sf
-Other,please specify in the comment box
below(sq ft) 0 sf sf
New infiltrating permeable pavement on
13 subdivided lots(sq ft) _ 0 sf sf
New infiltrating permeable pavement not on
14 subdivided lots(sq ft) - 0 sf sf
Existing BUA that will remain(not subject to
15 permitting)(sq ft) 0 sf sf
16 Existing BUA that is already permitted(sq if) —_ 0 sf sf _
17 Existing BUA that will be removed(sq ft) 0 sf sf
18 Percent BUA 73% 77% 64%
19 Design storm(inches) - 1 inch .8 in
20 Design volume of SCM(cu ft) - 19512 cf N/A
21 Calculation method for design volume - Rational Method Rational Method
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 'drainage area(s):
19-20 for Area 2:The drive entrances cannot physically drain to the Sand
Filter onsite,so the drives and site frontage will drain to a treatment swale.
This swale receives water from a portion of an existing industrial site.The
treatment swale was designed for the 0.75-inch WQ event

SAND FILTER
1lDrainage area number 1
21Minlmum required treatment volume(cu ft� - 19512 cf
GENERAL MDC FROM 02H.1050 _ _ _
3l Is the SCM sized to treat the SW from all surfaces at build-out? Yco
4 Is the SCM located away from contaminated soils? Yes
5 What are the side slopes of the SCM(H:V)? 2:1
6 Does the SCM have retaining walls,gabion walls or other engineered No
side slopes?
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 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)? Yes
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 I No
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) -500.5 _
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? Yes
Sediment Chamber
23 Volume that can be retained in the sediment chamber(cubic feet) 8847 cf
24 Will there be a permanent pool in the sediment chamber? No
25 Bottom of the sediment chamber(fmsl) 510.00 -
26 Area of the sediment chamber(square feet) 6311 sf
27 Physical depth of the sediment chamber(inches) 24 in
28 Ponding depth in the sediment chamber,above any permanent pool 24 in
(inches)
29 Elevation of top of weir between chambers(fmsl) 512
Sand Chamber
30':Volume that can be retained in the sand chamber(cubic feet) - 80417 cf
311Bottom of the sand chamber(fmsl) 509.00
32IArea of the sand chamber(square feet) 3120 sf
331 Physical depth of the sand chamber(inches) 24 in
34 Ponding depth in the sand chamber,above the sand surface 60 in
(inches)
35 Elevation of the bypass device(fmsl) 510.76
36 Type of bypass device Window
37 Mechanism for distributing flow over the sand surface Forebay Berm
38 Sand specification for sand chamber ASTM C33
39 Depth above underdrain pipe(inches) 9 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 I W ill clean-out pipes be capped? Yes
ADDITIONAL INFORMATION
43 Please use this space to provide any additional information about the
sand filter(s): _
18.Boring at sand filter did not find water at 10.5 feet down from existing
grade(-511.00 feet)
39.Note the underdrain outlet comes out of the sand filter at 9 inches of
depth,however the rest of the underdrain is-3 feet below the sand filter
surface.
Sand Filter 3 11:02 AM 1/12/2023

TREATMENT SWALE
1 Drainage area number 2
2 Design flow rate of SCM(cfs) 1.12 cfs
GENERAL MDC FROM 02H.1050
3 Is the SCM sized to treat the SW from all surfaces at build-out? Yes
4 Is the SCM located away from contaminated soils? Yes
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 No
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)? Yes
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 No
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
TREATMENT SWALE MDC FROM 02H.1061
18 SHWT elevation(fmsl) [ —500.5
19 Bottom of the treatment swale(fmsl) 507.36
20 Depth of treatment swale(feet) _ 5 cf
21 Is the swale trapezoidal in shape? Yes
22 Width of bottom of swale(feet) r 5 ft
23 Side slopes of treatment swale(H:V) 3:1
24 Length of swale(feet) 310 ft
25 Flow depth during the 0.75 inch/hour storm(inches) 2 in
26 Flow velocity during the 0.75 inch/hour storm(feet per second) 2 cfs
27 Hydraulic retention time for swale(minutes) 18 min
28 Species of grass that will be used Bermuda or
Fescue
29 Will the grass be maintained at an average height of 6 inches? Yes
30 Will the grass not be cut lower than 4 inches? Yes
31 Velocity during the 10-year storm(feet per second) 4 ft/s
32 Is the swale designed to non-erosively pass the 10-year storm? Yes
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
33 treatment swale(s):
TrSwale 4 11:02 AM 1/12/2023