SW6221006_Supplement-EZ Form_20230731

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
'PROJECT INFORMATION
1 Project Name CCBCC-Fayetteville
2 Project Area(ac) 13.7
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) 30
8 Will the vegetated setback remain vegetated? N/A
9 If BUA is proposed in the setback,does it meet NCAC 02H.1003(4)(c-d)? N/A
10 Is streambank stabilization proposed on this project?
NUMBER AND TYPE OF SCMs:
11 Infiltration System
12 Bioretention Cell
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 2
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title: Ethan Hart, P.E.-Civil Engineer
28 Organization: Fitts and Goodwin,Inc.
29 Street address: 120 Corporate Blvd.
30 City,State,Zip: West Columbia,SC 29169
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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DRAINAGE AREAS
r5 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
versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site 1 2
4 Type of SCM Filterra Filterra
5_Total drainage area(sq ft) 596772 22651 22651
6 Onsite drainage area(sq ft) 596772 22651 22651
7 Offsite drainage area(sq ft) 0 0 0
8 Total BUA in project(sq ft) 325831 sf 21344 sf 21344 sf
New BUA on subdivided lots(subject to permitting)
9 (sq ft) -
New BUA not on subdivided lots(subject to
10 permitting)(sf) 31798 sf
11 Offsite BUA(sq ft)
1
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) _ 31798 sf
-Sidewalk(sq ft) ...___
-Roof(sq ft)
— T-Roadway(sq ft)-Future(sq ft)
-Other,please specify in the comment box
below(sq ft)_
New infiltrating permeable pavement on
13 subdivided lots(sq ft)
New infiltrating permeable pavement not on
14 subdivided lots(sq ft)
Existing BUA that will remain(not subject to
15 permitting)(sq ft) 294033 sf 21344 sf 21344 sf
16 Existing BUA that is already permitted(sq ft)
17 Existing BUA that will be removed(sq ft)
18 Percent BUA _ 55% 94% 94%
19 Design storm(inches) —— _ 1.0 in 1.0 in
20 Design volume of SCM cu ft 1407 cf 1407 cf
21 Calculation method for design volume Discrete Discrete
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
Expansion to existing site results in a net increase of 0.73-ac(31,798-sf)
impervious area.Runoff from an existing 1-ac parking lot draining to the site's
existing basin is being treated by a two(2)-Filterra bioretention SCMs in lieu
of modifications to the existing basin.

FILTERRA BIORETENTION
1 Drainage area number 1 2
2 Minimum required treatment volume(cu ft) 1407 1407
GENERAL MDC FROM 02H.1050
3 Is the SCM sized to treat the SW from all surfaces at build-out? Yes Yes
4 Is the SCM located away from contaminated soils? Yes Yes
5 What are the side slopes of the SCM(H:V)?
6 Does the SCM have retaining walls,gabion walls or other engineered
side slopes?
Are the inlets,outlets,and receiving stream protected from erosion Yes Yes
7 (10-year storm)?
Is there an overflow or bypass for inflow volume in excess of the Yes Yes
8 design volume?
9 What is the method for dewatering the SCM for maintenance?
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
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? Yes Yes
17 Was the SCM designed by an NC licensed professional? Yes Yes
FILTERRA BIORETENTION MDC FROM THE STORMWATER DESIGN MANUAL
18 Type of pretreatment that will be used Rip Rap Rip Rap
Dissipation Dissipation
19 Depth of storage above the filter media surface(in) 6 in 6 in
20 Surface area of the Filterra Bioretention system(sq ft) 91 sf 91
21 Method of flow distribution over the media Disperse Disperse
22 Infiltration rate of engineered media(inch/hour) 140 in/hr 140 in/hr
23 Diameter of the underdrain pipes(if applicable) 6 in 6 in
24 Does the design include Internal Water Storage(IWS)? No No
25 if so,elevation of the top of the IWS(fmsl) N/A N/A
26 Elevation of the planting surface(fmsl) 94.5 94.7
27 Species of tree(s)that will be planted Eastern Redbud Eastern Redbud
28 Media depth(inches) 15 in 15 in
29 Number of clean out pipes 1 each 1
Will maintenance be performed per the Filterra Operations and Yes Yes
30 Maintenance Manual?
ADDITIONAL INFORMATION
31 Please use this space to provide any additional information about the
Filterra Unit( ):
The ponding depth and filter media depth differ from the MDC.This is due to
a shallow existing invert on the catch basin both Filterra units will tie into.The
design parameters have been approved by Contech as stated in the attached
email.