SW3231102_Supplement-EZ Form_20240430

SUPPLEMENT-EZ COVER PAGE
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PROJECT INFORMATION
1 Project Name Heritage Building Company Site Improvements
2 Project Area(ac) 12.91
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 0
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) 3
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 1
13 Wet Pond
14 Stormwater Wetland
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 Dry Pond
23 StormFilter
24 Silva Cell
25 Bayfilter
26 Filterra
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DESIGNER CERTIFICATION
27 Name and Title: Darion George
28 Organization: Ravian Engineering,LLC
29 Street address: PO Box 802
30 City,State,Zip: Paducah,KY,42002
31 Phone number(s): 618-638-4788
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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Date

DRAINAGE AREAS
1 Is this a high density project? Yes
2 If so,number of drainage areas/SCMs 4
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 3 4
4 Type of SCM Bioretention None None None
5 Total drainage area(sq ft) 562396.83 418768 79111.11 7980.48 56537.24
6 Onsite drainage area(sq ft) 562396.83 418768 79111.11 7980.48 56537.24
7 Offsite drainage area(sq ft) 0 0 0 0 0
8 Total BUA in project(sq ft) 314793.14 187355 sf 65444 sf 5457 sf 56537 sf
New BUA on subdivided lots(subject to
9 permitting)(sq ft)
New BUA not on subdivided lots(subject to
10 permitting)(sf) 197132.9 180259 sf 11417 sf 5457 sf sf
11 Offsite BUA(sq ft) 0 sf sf sf sf
12 Breakdown of new BUA not on subdivided lots: 0
-Parking(sq ft) 0
-Sidewalk(sq ft) 0
-Roof(sq ft) 0
-Roadway(sq ft) 0
-Future(sq ft) 0
-Other,please specify in the comment box
below(sq ft) 197132.78 180259 sf 11417 sf 5457 sf sf
New infiltrating permeable pavement on
13 subdivided lots(sq ft) 0
New infiltrating permeable pavement not on
14 subdivided lots(sq ft) 0
Existing BUA that will remain(not subject to
15 permitting)(sq ft) 0 _ sf _ sf
16 Existing BUA that is already permitted(sq ft) 123694.58 10783 sf 56374 sf sf 56537 sf
17 Existing BUA that will be removed(sq ft) 3704 sf
18 Percent BUA 45% 83% 68% 100%
19 Design storm(inches) 5.1 in 5.1 in 5.1 in 5.1 in 5.1 in
20 Design volume of SCM(cu ft) 62826 cf
21 Calculation method for design volume TR-55
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
Gravel Pad

BIORETENTION CELL
1 Drainage area number 1
2 Minimum required treatment volume(cu ft) 75644 cf
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 side slopes? No _
Are the inlets,outlets,and receiving stream protected from erosion 7
(10-year storm)? Yes _
8 Is there an overflow or bypass for inflow volume in excess of the
design volume? Yes —
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
General MDC(10)? N/A
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
BIORETENTION CELL MDC FROM 02H.1052
18 SHWT elevation(fmsl) 772.42 _
19 Bottom of the bioretention cell(fmsl) 773.50
20 Ponding depth of the design storm(inches) 11 in _
21 Surface area of the bioretention cell(square feet) 33758 sf
22 Design volume of SCM(cu ft) 62826 cf _
23 Is the bioretention cell used for peak attenuation? Yes
24 Depth of peak attenuation over planting surface(in) 18 in _
25 Height of peak attenuation outlet above the planting surface(in) 12 in
26 Infiltration rate of the in situ soil(inch/hour) 1 in/hr _
27 Diameter of the underdrain pipes(if applicable) 6 in
28 Does the design include Internal Water Storage(IWS)? Yes _
29 if so,elevation of the top of the IWS(fmsl) 774.5
30 Elevation of the planting surface(fmsl) 776 _
31 What type of vegetation will be planted? (grass,trees/shrubs,
other)? Grass _
32 Media depth(inches) 30 in
33 Percentage of medium to coarse washed sand by volume 85% _
34 Percentage of fines(silt and clay)by volume 10% _
35 Percentage of organic matter by volume 5% _
36 Type of organic material pine bark fines_
37 Phosphorus Index(P-Index)of media(unitless) 30 _
38 Will compaction be avoided during construction? Yes _
39 Will cell be maintained to a one inch/hour standard? Yes _
40 Depth of mulch,if applicable(inches) N/A
41 Type of mulch,if applicable N/A
42 How many clean out pipes are being installed? 11
43 Type of pretreatment that will be used: Rock Check Filters
ADDITIONAL INFORMATION
44 Please use this space to provide any additional information about
the bioretention cell(s):
Bioretention 3 9:58 AM 4/30/2024