SW3141103_Supplement-EZ Form_20240822

SUPPLEMENT-EZ COVER PAGE
1 FORMS LOADED,
PROJECT INFORMATION
1 Project Name AIIYIy-Building lttpansion
2 Prc(ect Area iaci- — 32.5486
3 Coastal Wetland Area(ac)
4 Surface Water Area(ac)
5 Is this project High or Low Densityl T t•IQh
6 Does this project use an off-site SCM? No
COMPLIANCE WITH 02H.1003(4)
7 Width of vegetated setbacks provided(feet)
_ 8 Will the vegetated setback remain vegetated? NIA
9 If BUA Is ed In the setback,does It meet NCAC 02H.1003(4Xc-d)? NIA
10 Is streembank stabilization proposed on this prooect? No
NUMBER AND TYPE OF SCMs:
11 Infiltration System -.
12 Bioretention Cel
13 Wet Pond
14 Stormwater Wetland -
15 Permeable Pavement
16 Sand Filter 5
17 Rainwater Harvesting(RWHI
18 Green Roof
19 jlevel Spreader-Filter Strip(LS-FS)
20 Disconnected Impervious Surface(DIS)
21 Treatment Swale
22 Dry Pond_
23 StarmFllter •
•
24 3ilva Cell —
25 Bayilter
26 Fitterra
FORMS t.0AME0
DESIGNER CERTIFICATION
27 Name and Title: Carlton T Burton,Principle
28 Organization Burton Engineering Associates
i29 Street address: 5950 Fairview Rd,Suite 100
30 City,State,Zip Charlotte.NC 28210
31 Phone number(s!: 704 533 8881
32 Email. cburtonOburtoneng.corn
Certification Statement;
I certify,under penalty of law that this Supplement-EZ form and all supporting information ware 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
Orsfgnor
dk FESSI
•'QO Otii' aPiZh
4 •
SEAL • = Signature of Designer
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DRAINAGE AREAS
1 Is this a high density project? i Yes
2 If so,number of drainage areaslSCMs i 5
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
FORM LOAgja
DRAINAGE AREA INFORMATION Entire Sits 1 2 3 4
4 Type of SCM Sandfilter Sandfilter _Y- Sandfitter Sandfilter
5 Total drainage area(sq ft) 127195 230868 a 148054 131377
6 Onsite drainage area(sq ft) 114127 230868 _ 148054 131377
7 Offsite drainage area(sq ft) 13068 _
8 Total BUA in p_roject(sgftt 114127 sf r_175547 sf 118.943 sf 79266 sf
New BUA on subdivided lots(subject to
9 permittiV(sgk -�
New BUA not on subdivided lots(subject to
10 'permitting)(sl) - - 114127 sf - 175547 sf 118943 sf 79266sf_. _
11 Offsite BUA(stilt) __
12 Breakdown of new___B__UA not on subdivided_lots: _ _ _
-Parking(sq ft) 54886 sf 116274 sf 3655 sf 58316 sf
--
-Sidewalk(sq ft) 2573 sf 668 sf -'_ 3153 sf
►--- -Roof(sq ft) k 56700 sf 56700 sf 107318 sf
^4 -Roads Mil 7302 sf 17797 sf
_ -Future(sq ft)
-Other,please specify In the comment box
below(sq. --• -,--- — �— -- .
New infiltrating permeable pavement on
_13 subdivided lots(sq fti -
New infiltrating permeable pavement not on
14subdivided 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) —
18 Percent BUA 90% _76% _ 80% 60%
19 Design storm(inchesL 1.0 in 1-0 in 1.0 in _ 1.0 in
20 Design volume of SCM(cu ft) 7072 cf 17472 cf _ _ 13327 cf - 6704 cf
21 Calculation method for design volume , Stage Storage _ Stage Storage _ Stale Storage Stage Storage
DITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage areais):

DRAINAGE AREAS
1 Is this a High density project? Yes
2 If so,number of drainage areas!SCMs 5
3 Does this ,r•ect have low density areas? No
If so number of low density drainage areas 0
©Is alvpart of this project subject to previous rule
versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site 5
4 _Type of SCM Sandfilter
5 Total drainage area(sq ft) 202198
6 Onsite drainage area(sq ft) 202198
Offsite drainage area(sq ft)
8 Total BUA in project(sq ft) 169641 sf
'New BUA on subdivided lots(subject to
9 pormitting)isgft)
New BUA not on subdivided lots(subject to
10 permitting)(sf) 169641 sf
11 Ofsite BUA(sq ft)
12 Breakdown of new BUA not on subdivided lots:
-Parkirx�(sq ft) _ 71964 sf
-Sidewalk(sq ft) 980 sf
-Roof(sq ft) 96697 sf
-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)
16 Existing BUA that is alread1rpermitted(sq ft)
17 Existing BUA that will be removed(sq ft) + _
18 Percent BUA 84%
19 Design storm(inches) __ 1-0 In
20 Design volume of SCMjcu ft) 14958 cf
21 Calculation method for design volume } Stage Storage
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):

SAND FILTER
1 1 Drainage area number 1 2 3 4 5
2,Minimum required treatment volume Lou 1 8818 sf I 10592 sf I 9995 sf I 5028 sf I 11219 sf 1
1GE101 AL MDC FROM Q2t( - R
3 Is the SCM sized to treat the SW from all surfaces at build-out? Yee Yes Vas Yes v-es
4 Is the SCM located away from contaminated soils? Yes Yes Yes Yes Yes
5 What are the side slopes of the SCM i H:V)? 3:1 3:1 3:1 _ 3:1 _ F 3:1
6 Does the SCM have retaining walls,gablon walls or other engineered No No No No No
side sl—:•-? _
7 Are the inlets,outlets,and receiving stream protected from erosion Yes Yes Yes Yes ` Yes
(10-year storm)? _-
8 Is there an overflow or bypass for Inflow volume in excess of the Yes Yes Yes Yes Yes
design volume? i
9 What is the method for dewatering the SCM for maintenance? Other Other Other Other Other
- 10 If applicable,will the SCM be cleaned out after construction? Yes Yes N!A_ N/A N/A
_11 Does the maintenance access comply with General MDC l81? Yes Yes _ _Yes Yes Yes
I.12 Does the drainage easement comply with General MDC(917 Yes Yes - Yes Yes Yes
13 If the SCM is on a single family lot,does(will?)the plat comply with N/A NIA N/A NIA N/A
General MDC 10? __
14 Is there an O&M Agreement that complies with General MDC(11)? Yes Yes Yes Yes Yes
15 Is there an O&M Plan that complies with General MDC(12)? Yes Yes Yes Yes Yes
16 Does the SCM follow the device specific MDC? Yes Yes- Yes Yes Yes
17 Was the SCM designed byan NC licensedprofessional? Yes Yes Yes __ Yes Yes
18 SHWT elevation(fmsl) not encountered . not encountered-' not encountered not encountered not encountered
19'Type of sand filter(open or closed) .- Open _ Open Open Open Open _
20 If closed,will the filter will be pre-cast or pour-in-place? - _ -
21 If dosed,top ofrrate elevation(fmsl)
22 Is this sand filter designed to attenuate peak flows? Yes Yes Yes Yes Yes _
[Sediment Chamber
23 Volume that can be retained In the sediment chamber(cubic feet) 3349 cf 5177 cf 10928 d 8163 cf 9225 cf
24 Will there be a permanent pwaci in the sediment chamber? No No No No No
25 Bottom of the sediment chamber(fmsl) 790.00 788.00 775 60 769.00 784.50
26 Area of the sediment chamber(square feet) 5986 sf 7639 sf 2600 sf 1600 sf 2050 sf V
27 Physical depth of the sediment chamber(inches) 24 In _ 24 In 42In_ 24 In 36 in .W
28 Pending depth in the sediment chamber,above any permanent pool gin 15 in 22 In 12 in 18in
(inches)
29 Elevation of top of weir between chambers(fmsl) I 792 790 779.2 771 786
Sand Chamber y
30 Volume that can be retained in the sand chamber(cubic feet; 3443 d 5410 of 10928 cf 8163 d 1 9225 cf
311Bottom Bottom of the sand chamberffmsl) _ 789.00 787.00 775.60 769.00 784.50
32IArea of the sand chamber(square feet) 3062 sf 3944 sf 2000 sf 775 sf 2050 sf
33 Physical depth of the sand chamber(Inches) _ 36 In_ 36 in 42 in 24 in 36 in
Pending depth in the sand chamber,above the sand surface
34(inches) 9 in Y 15 in 22 in 121n 18 in
35 Elevation of the bypass device(fmst) 790.7 790 778.5 772 789.25 _ _
36 Type of bypass device riser riser _ riser riser riser
37 Mechanism for distributing flow over the sand surface Rip Rap Rip Rap_ Rip Rap Rip Rae Rip Rap
38 Sand specification for sand chamber C33 T C33 C33 C33 C33
39 Depth above underdrain pipe(inches) 18 in _� 18 in 18 in 18 in 18 in
401Aill the media be maintained to drain at least two inches per hour at Yes Yes Yes Yes Yes
!the sand surface?
41 Is at least one clean-out pipe provided at the low point of each Yes Yes Yes Yes Yes
underdrainline? _ __ __ _
42 Will clean-outp'es be capped? Yes Yes Yes Yes Yes
ADDITIONAL INFORMATION �-
43 Please use this space to provide any additional information about the
sand filter(s):
2