SWA000227_Supplement-EZ Form_20231031

SUPPLEMENT-EZ COVER PAGE
LOAD SUPPLEMENT FORMS
PROJECT INFORMATION
1 Project Name Waxhaw Volunteer Fire Department
2 Project Area(ac) _ _ _ 4.15
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) N/A
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? 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 0
22 Dry Pond 0
23 StormFilter 0
24 Silva Cell _ _ _ 0
25 Bayfilter 0
26 Filterra 0
LOAD SUPPLEMENT FORMS
DESIGNER CERTIFICATION
27 Name and Title: Brad Smith,PE,PMP
28 Organization: _ Timmons Group
29 Street address: 610 E Morehead St,Suite 250
30 City,State,Zip: Charlotte,NC 28202
31 Phone number(s): 704-376-1079
32 Email: brad.smith@timmons,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
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DRAINAGE AREAS
I Is this a high density project? Yes
2 If so,number of drainage areas/SCMs 1
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
4 Type of SCM sand filter sand filter
5 Total drainage area(sq ft) 189486 101930
6 Onsite drainage area(sq ft) 126056 101685
7 Offsite drainage area(sq ft) 63430 245
8 Total BUA in project(sq ft) 49361 sf 49361 sf
New BUA on subdivided lots(subject to
9 permitting)(sq ft) - -
New BUA not on subdivided lots(subject to
10 permitting)(sf) 49361 sf 49361 sf
11 Offsite BUA(sq ft) - -
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) 30851 sf 30851 sf
-Sidewalk(sq) 2860 sf 2860 sf
-Roof(sq ft) 10326 sf 10326 sf
-Roadway(sq ft) - -
-Future(sq ft) 5324 sf 5324 sf
-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
15permitting)(sq ft) - -
16 Existing BUA that is already permitted(sq ft) - -
17 Existing BUA that will be removed(sq ft) - -
18 Percent BUA sf 28%
19 Design storm(inches) 5.2 in
20 Design volume of SCM(cu ft) 38262 sf 38262 cf
21 Calculation method for design volume Prismatic Prismatic
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 !drainage area(s):

SAND FILTER
1 Drainage area number 1
2 Minimum required treatment volume(cu R) 8752 sf
GENERAL MDC FROM 02H.1050
3 Is the SCM sized to treat the SW from all surfaces at build-out? 4ee _
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)?
is there an overflow or bypass for inflow volume in excess of the
8 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 _
If the SCM is on a single family lot,does(will?)the plat comply with
13 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
amFILTER MCC FROM 02H.10.11
18 SHWT elevation(fmsl) below 570'
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) 19131 cf
24 Will there be a permanent pool in the sediment chamber? No
25 Bottom of the sediment chamber(fmsl) 577.00
26 Area of the sediment chamber(square feet) 4745 sf
27 Physical depth of the sediment chamber(inches) 72 in _
28 Ponding depth in the sediment chamber,above any permanent pool N/A
(inches)
29 Elevation of top of weir between chambers(fmsl) 579
Sand Chamber
3&Volume that can be retained in the sand chamber(cubic feet) 19131 cf
31 Bottom of the sand chamber(fmsl) 577.00 _
32 Area of the sand chamber(square feet) 4745 sf
33 Physical depth of the sand chamber(inches) 18 in
34 Ponding depth in the sand chamber,above the sand surface 60 in
(inches)
35 Elevation of the bypass device(fmsl) 578.21
36 Type of bypass device ORIFICE
37 Mechanism for distributing flow over the sand surface FLOW _
38 Sand specification for sand chamber ASTM C-33
39 Depth above underdrain pipe(inches) 12 in _
Will the media be maintained to drain at least two inches per hour at
40 the sand surface? Yes
Is at least one clean-out pipe provided at the low point of each
41 underdrain line? Yes
42 Will dean-out-pipes be capped? Yes
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
43Isand filter(s):
2