SW1240604_Supplement-EZ Form_20240813

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name Workforce Outdoor Training Site
2 Project Area(ac) 11.12
3 Coastal Wetland Area(ac) _
4 Surface Water Area(ac) 0.01
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) 0
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
12 Bioretention Cell
13 Wet Pond
14 Stormwater Wetland
15 Permeable Pavement
16 Sand Filter 1
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 Storm Filter
24 Silva Cell
•
25 Bayfilter
26 Filterra
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title: D.Harry Luzius Jr.,P.E.
28 Organization: Civil Design Concepts
29 Street address: 168 Patton Avenue
30 City,State,Zip: Asheville,NC,28801
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
1 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 Total Site Sand Filter
5 Total drainage area(sq ft) 484388 193581
6 Onsite drainage area(sq ft) 484388 193581
7 Offsite drainage area(sq ft) 0 0
8 Total BUA in project(sq ft) 124245 sf 119552 sf
New BUA on subdivided lots(subject to permitting)
9 (sq ft)
New BUA not on subdivided lots(subject to
10 permitting)(sf)
11 Offsite BUA(sq ft) sf sf
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) 122229 sf 117536 sf
-Sidewalk(sq ft) 1073 sf 1073 sf
-Roof(sq ft) 943 sf 943 sf
-Roadway(sq ft)
-Future(sq ft)
-Other,please specify in the comment box below
(sq ft)
New infiltrating permeable pavement on subdivided
13 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)
16 Existing BUA that is already permitted(sq ft)
17 Existing BUA that will be removed(sq ft) 4693 sf 4693 sf
18 Percent BUA 26% 62%
19 Design storm(inches) 1.0 in
20 Design volume of SCM(cu ft) 5896 cf
21 Calculation method for design volume Discrete Method
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):

SAND FILTER
1 Drainage area number 4.44
2 Minimum required treatment volume(cu ft) 5896 sf
GENERAL MDC FROM 02H.1050
3 Is the SCM sized to treat the SW from all surfaces at build-out? Yet,.
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)?
8 Is there an overflow or bypass for inflow volume in excess of the Yes
design volume?
9 What is the method for dewatering the SCM for maintenance? Pump(preferred)
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)? _ N/A
If the SCM is on a single family lot,does(will?)the plat comply with
13 N/A
General MDC(10)?
14 Is there an O&M Agreement that complies with General MDC Li 1)? _ 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
SAND FILTER MDC FROM 02H.1056
18 SHWT elevation(fmsl) 2618
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) _ 8308 cf
24 Will there be a permanent pool in the sediment chamber? No
25 Bottom of the sediment chamber(fmsl) _2624.25
26 Area of the sediment chamber(square feet) 615 sf
27 Physical depth of the sediment chamber(inches) 81 in
28 Ponding depth in the sediment chamber,above any permanent pool 57 in
(inches)
29 Elevation of top of weir between chambers(fmsl) 2629
(Sand Chamber
30 Volume that can be retained in the sand chamber(cubic feet) 8935 cf
31 Bottom of the sand chamber(fmsl) 2622.75
32 Area of the sand chamber(square feet) 615 sf
33 Physical depth of the sand chamber(inches) 105 in
34 Ponding depth in the sand chamber,above the sand surface(inches) 57 in
35 Elevation of the bypass device(fmsl) 2629
36 Type of bypass device Open Top
Level grading &rip
37 Mechanism for distributing flow over the sand surface rap berm,
standpipe manifold
38 Sand specification for sand chamber "CONCRETE"
SAND ASTM C33
39 Depth above underdrain pipe(inches) 18 in
40 Will the media be maintained to drain at least two inches per hour at Yes
the sand surface?
41 Is at least one clean-out pipe provided at the low point of each yes
underdrain line?
42 Will clean-out pipes be capped? Yes
ADDITIONAL INFORMATION
43 Please use this space to provide any additional information about the
sand filter(s):
For lines 26&32 the area of sediment chamber and sand chamber are at
2624.25'elevation.
Sand filters,are designed to treat 0.75 times the design volume:7861 cf X
75%=5896 cf
2