SW4200702_Supplement-EZ Form_20201106

SUPPLEMENT-EZ COVER PAGE
COMPLIANCE WITH 02H 1003(4) ,e, .
7 Width of vegetated setbacks provided (fee&
8 Will the vegetated setback remain vegetated?
9 proposed O(` )?
If BUA is ro osed in the setback, does it meet NCAC 02H.1t76J3 �1 u..d
10 Is streambank stabilization proposed on this project?
NUMBER AND TYPE OF SCMs:
v — -. , .w „ ... a,om , r,.„ �,,,,b
1 I tnfRtration System
12 ,Bioretention Cell
13 Wet Pond
14 Stormwater Wetland
15 Permeable Pavement
16 ISand Filter
17 Rainwater Harvesting (RWH)
18 ,Green Roof
19 Level Spreader -Filter Strip (LSD
20 Dusconnecled Impervious Surface (DIS)
21 Treatment Swale
22 i Dry Pond
23 StormFilter
24 ;Silva Cell
25 , By
a 'utter
26 Filterra
Ad nli Cprroh, PE, Sr, Prrotecl anagerr
Timmons 4lrotap
8642 W, Market Street, Suite 136
ans corn
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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Signature ofibesigner IF
Date

DRAINAGE AREAS
1 Is this a high density project? E 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 iversions? _ No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site 1
� 4
Type of SCM
BEocell
5
mTotal drains a areas ft
207415 124146
6
Onsite drainage area (sq ft
207415 124146
7
Offsite drainage area (sq ft)
8
Total BUA in project (sq ft)
79377 sf 70109 sf
New BUA on subdivided lots (subject to permitting),
P 9
,(sq ft)'New
BUA n subdivided lots (subject to
10
permitting)79377
(�
sf 70109 sf
11
Offsite BUA ssqft
12
Breakdown of new BUA not on subdivided lots
Parking (sq ft)
56347 sf 48469 sf
Sidewalk q ft)
s
_ Roof (sq ft)
11719 sf 89 19sf,...
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 already permitted (sq ft)
- -
17
Existing BUA that will be removed (sq ft)
_ t _
9953 sf
18
Percent BUA
38% 57%
19
Design storm (inches)
1.0 in
20
!Design volume of SCM (cu ft)
5777 cf
j 21
Calculation method for design volume
Simple Method
P t od
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ADDITIONAL INFORMATION
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Please use this space to provide any additional information about the
22
drainage area(s):
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pig

BIORETENTION CELL
1 Drainage area number
2 Minimum inquired treatment volume Ictj'ft)
i 1
5777 off
3 Is the SCM shed to treat the SW from ail surfaces at btuitd-out?
4 Is the SCM located away from contaminated soils?
5 j What are the side slopes of the SCM (H:V)?
6 Does the SCM have retaining walls, gabion walls or other engineered
side slopes?
7 Are the inlets outlets and receiving stream protected from erosion
(10-year storm)?
8 Is there an overflow or bypass for inflow volume in excess of the
;design volume?
9 What is the method for dewatering the SCM for maintenance? Pi
10 If applicable, will the SCM be cleaned out after construction?
11 Does the maintenance access comply with General MDC (8)?
12 j Does the drainage easement comply with General MOC (9)?
If the SCM is on a single family lot, does (will?) the plat comply with
13 ,General MDC (10)?
14 f
Is there an O&M Agreement that complies with General MDC (11)?
15 'is there an O&M Plan that complies with General MDC (12)?
16 Does the SCM follow the device specific MDC?
17 Was the SCM destined by an NC licensed professional?
18 SHWI elevation (find)
19 'Bottom of the bioretention cell (frnsl)
20 Ponding depth of the design storm (inches;)
21 Surface area of the bioretention cell (square feet)
22 Design volume of SCM (cu It)
23 Is the bioretention cell used for peak attenuation?
24 Depth of peak attenuation over planting surface (in)
25 Height of peak attenuation outlet above the planting surface (in)
26 Infiltration rate of the in situ soil (inch/hour)
27 Diameter of the underdrain pipes (if applicable)
28 Does the design include Internal Water Storage (IWS)?
29 if so, elevation of the top of the IWS (fmsl)
30 Elevation of the plantng surface (fmsl)31 —
What type of vegetation will be planted? (grass, trees/shrubs,
other)?
t
32 Media depth (inches)
33 Percentage of mednzm to coarse washed sand by volume
34 Percentage of fines (silt and clay) by volume
35 Percentage of organic matter by volume
36 Type of organic material
37 Phosphorus Index (P•Index) of media (unitless)
38 Will compaction be avoided during construction?
39 ! Will cell be maintained to a one inch/hour standard?
40 rDepth of mulch if applicable (Inches)
41 Type of mulch if applicable
42 j How many clears out pipes are being installed?
43 i Type of pretreatment that will be used:
ADDITIONAL INFORMATION
44 ! Please use this space to provide any additional information about the
bioretention cell(s):
rinal cell mix to be reviewed and verified to meet NCDEQ prior to
ristalfabon. SHWT was not found in the boring nearest to the biocell. The
lepth shown is the termination elevation of the boring..
Yes
Yes
Yes
Yes
Yes
Yes,.
<905„
909.83
12 in
6005 sf
6005 cf
Yes
12 in
12 in,.
6in.,
Yes
912 5
914.
Grass
30 in
75-85%
8-15%
5-10%
TBD
10to50
Yes
Yes
NA
NA
13
Bioretention 3 3:50 PM 11/5/2020