SW3240102_Supplement-EZ Form_20240816

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED I
PROJECT INFORMATION
1 Project Name Lanes Creek Volunteer Fire Department
2 Project Area(ac) 3.22
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 0
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
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 StripJLS-FS)
20 Disconnected Impervious Surface_SDIS)
21 Treatment Swale
22 Dry Pond
23 Storm Filter
24 Silva Cell
25 Bayfilter _ _ -_._
26 Filterra
FORMS LOADED
DESIGIsIOAETRIfiBCCATION
27 Name and Title: Jeff McClusk -President
28 Organization: Mc2 Engineering,Inc.
29 Street address: 2110 Ben Craig Drive,Suite 400
30 City,State,Zip: Charlotte,NC 28262
31 Phone number(s): 704-510-9797
32 Email: jeff©mc2eng.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
Np0; ,0ffrJ 00001411,41
) tltl y^. ... ®tlp`T�,r.r9�6 ,�M1yi' °°'(°°° °O°p°* 1 ` �...e..�.
��
ck-
e Q e # ee.'8` 7!� r Signature f Desig er
r• •
= SEAL
:• 29606 = •
•
•' r nt��, • cep :c� ��.' C�t
J''-1 /;4 t°'�L .-C�tl°'`c� �°"� a�°`A'°.;ta jlN °�� � 5�.�r� IJ. F10. �„'.l�'i00 96 � `: °0°°°°°°° Ord .01512 2 A
D. cO v;° seal Soso W A/EEa���°`� Date
�f�i►1!!!!lla%�

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 2
Is all/part of this project subject to previous rule
5 versions? No
CLICK TO LOAD FORM
DRAINAGE AREA INFORMATION Entire Site LD 1
Disperesed Flow
4 Type of SCM Disperesed Flow Level Spreader_
5 Total drainage area(sq ft) 140,263 _ 10,725
6 Onsite drainage area(sq ft) 140,263 _ 10,725
7 Offsite drainage area(sq ft) 0 _ 0
8 Total BUA in project(sq ft) 27925 sf 2010 sf
New BUA on subdivided lots(subject to
9 permitting)(sq ft) sf sf
New BUA not on subdivided lots(subject to
10 permitting)(sf) 27925 sf 2010 sf
11 Offsite BUA(sq ft) sf sf
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) 8579 sf sf
-Sidewalk(sq ft) 1423 sf 621 sf
-Roof(sq ft) 2760 sf 1389 sf
-Roadway(sq ft) sf sf
-Future(sq ft) sf sf
-Other,please specify in the comment box
below(sq ft) sf sf
New infiltrating permeable pavement on
13 subdivided lots(sq ft) sf sf
New infiltrating permeable pavement not on
14 subdivided lots(sq ft) sf sf
Existing BUA that will remain(not subject to
15 permitting)(sq ft) 15163 sf 1528 sf
16 Existing BUA that is already permitted(sq ft) sf sf
17 Existing BUA that will be removed(sq ft) 14559 sf sf
18 Percent BUA 20% 19%
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):
Net decrease impervious area of 1,797 sf.

LOW DENSITY
DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H.1003
1 Is 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)? Yes
4 Side slopes of the vegetated conveyances(H:V) 3:1
5 Maximum velocity in the vegetated conveyances during the 10-year storm? 1.19
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) 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? Yes
12 Is stormwater released at the edge of the setback as dispersed flow? Yes
13 Have stormwater outlets been designed to prevent downslope erosion? Yes
14 Are variations to rule .1003 proposed? Yes
ADDITIONAL INFORMATION
15 Please use this space to provide any additional information about this low density project:
As indicated above in#14 this project is requesting a variation to rule .1003. Do to existng flooding issues with the rear of the ex
building and protection for the proposed addition the plan is to install a roof header system with drop inlets only on the rear of the
building to capture this runoff and then discharge it under the parking lot do to grade challenges. The proposed pipe has been
reduced to the minimum length possible and incorporates a level spread outlet at the discharge to provide dispersed flow. Non-
erosive discharges are provided within the channel per the calculations. The discharge from the pipe and the sheet flow from
the parking lot will then enter an 18'wide grass swale along the edge of the parking lot which then sheet flows off-site to the
existing stream which is 190'away from the level spreder. All of the drainage areas into the storm sewer system are low density
along with the project bein lowc�density. Finally the project actually provides a reduction in the BUA
Drainage Pervious
Swale BUA Q Slope Vallow Vactual Flow depth
Area area
(ac) (cfs) (%) (fps) (fps) (ft)
(ac) (ac)
1 0.52 I 0.22 0.30 0.58 2.33 2.00 4.50 1.19 0.17
2
3
4
5
6
7
8
9
_10
11
12
13