SW5240101_Supplement-EZ Form_20240301

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
i 1 Project Name Siler City WWTP Expansion
2 Project Area(ac) 55.26
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 0.69
•
5 Is this project High or Low Density? Low
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? Yes
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? 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 0
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 0
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: David Honeycutt.PE
28 Or.anization: McGill Associates
29 Street address: _ 5 Regional Circle,Suite A
30 Ci ,State,Zi.: Pinehurst,NC 28374
®Phone number(s: 910-295-3159;910-690-2583(cell)
32 ;Email: j david.honeycuttimcgillassociates.com
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? No
2 If so,number of drainage areas/SCMs 0
3 Does this project have low density areas? Yes
4 If so,number of low density drainage areas 1
Is all/part of this project subject to previous rule
5 versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site LD 1
4 Type of SCM N/A N/A
5 Total drainage area(sq ft) 2,407,126 2407126
6 Onsite drainage area(sq ft) 2,407,126 2407126
7 Offsite drainage area(sq ft) 0 0
8 Total BUA in project(sq ft) 174517 sf 174517 sf
New BUA on subdivided lots(subject to permitting)
9 l(sq ft) NA N/A
New BUA not on subdivided lots(subject to
10 permitting)(sf) 58475 sf 58475 sf
11 Offsite BUA(sq ft) sf sf
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) sf sf
-Sidewalk(sq ft) 2587 sf 2587 sf
-Roof(sq ft) 10682 sf 10682 sf
-Roadway(sq ft) 36081 sf 36081 sf
-Future(sq ft) sf sf
-Other,please specify in the comment box
below(sq ft) 9125 sf 9125 sf
New infiltrating permeable pavement on
13 subdivided lots(sq ft) NA N/A
New infiltrating permeable pavement not on
14 subdivided lots(sq ft) NA N/A
Existing BUA that will remain(not subject to
15 permitting)(sq ft) 116042 sf 116042 sf
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 7% 7%
19 Design storm(inches) N/A N/A
20 Design volume of SCM(cu ft) N/A _ N/A
21 Calculation method for design volume N/A N/A
,ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
The other impervious includes various features of the WWTP such as
headworks,clarifier,anaerobic basin,valve vaults,etc.

LOW DENSITY
(DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H.1003 W
1 its project below density thresholds set forth in the applicable stormwater rule? Yes
2 Does project maximize dispersed flow and minimize channelization of flow? Yes
3 Has the use of piping been minimized per.1003(2)(c)? I Yes
4 Side slopes of the vegetated conveyances(H:V) (3:1)
5 Maximum velocity in the vegetated conveyances during the 10-year storm? 4.16
6 ;Are curb outlet swales proposed? No
7 Maximum longitudinal slope of curb outlet swale(s)(%) N/A -
8 Bottom width of curb outlet swale(s)(feet) i N/A
9 Maximum side slope of curb outlet swale(s)(H:V) N/A
10 Minimum length of curb outlet swale(s)(feet) N/A
11 Are treatment swales used instead of curb outlet swales? N/A
12 Is stormwater released at the edge of the setback as dispersed flow? Yes
13 Have stormwater outlets been designed to prevent downslope erosion? I Yes
• 14 Are variations to rule.1003 proposed? No
;ADDITIONAL INFORMATION
s
I15 Please use this space to provide any additional information about this low density project:
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Swale Drainage BUA Pervious I O I Slope V,Ro„ V.,„,„, 1 Flow depth
, Area# (ac) (ac) (a�1 C (cfs) (%) (fps) (fps) (ft)
1 0.67 0.06 0.61 0.44 i 1.74 3.40 - 5.50 2.86 0.45
2 1.39 0.24 1.15 0.35 2.86 i 7.77 5.00 4.16 0.34
3 0.14 0.00 0.14 0.16 0.13 I- 5.83 5.00 1.00 0.10
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