SW1201001_Supplement-EZ Form_20201229

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1
Project Name
Circle K Mills River (Jeffress Road)
2
Project Area (ac)
1.8
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
imisimimminuilligic
DESIGNER CERTIFICATION
27
Name and Title:
Paul N. Lawler, P.E. Project Manager
28
Organization:
Bowman Consulting Group
29
Street address:
4350 Main St.; Suite 219
30
City, State, Zip:
Harrisburg, NC 28075
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.
O�.-O-SS/
•'0 ,
E L'"_
A •. GINE Q—
Signature 6f Designer 6"
Date
11 /25/20

DRAINAGE AREAS
1
Is this a high densityproject?
p j t?
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
FOftMSI..OADFD
DRAINAGE AREA INFORMATION
Entire Site
1
4
Type of SCM
Sand Filter
5
JTotal drainage area (sq ft)
67285
67285
6
Onsite drainage area (sq ft
67285
67285
7
Offsite drainage area (sq ft)
0
0
.........................................................................................................................................................................................................................................................................................................................................................
8
Total BUA in project (sq ft)
52370 sf
52370 sf
New BUA on subdivided lots (subject to permitting)
9
(sq ft)
sf
sf
New BUA not on subdivided lots (subject to
10
permitting) (so
52370 sf
52370 sf
11
Offsite BUA (sq ft)....
sf
sf
12
Breakdown of new BUA not on subdivided lots:
Parking (sq ft)
42300 sf
42300 sf
Sidewalk (sq ft)
4740 sf
4740 sf
Roof (sq ft)
5330 sf
5330 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)
sf
sf
16
Existing BUA that is already permitted (sq ft)
sf
sf
17
Existing BUA that will be removed (sq ft)
18800 sf
18800 sf
18
Percent BUA
56%
56%
19
Design storm (inches)
0 in
1.0 in
20
Design volume of SCM (cu ft)
cf
3154 cf
21
Calculation method for design volume
cf....
Simple Method
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22
drainage area(s):
See
plan sheet C2.3 for breakdown in existing & proposed BUA areas. Design
volume for sand filter was calculated at 0.75 times required treatment vollume
per MDC 3.

SAND FILTER
III 13rainaae area number
fl
3 Is the SCM sized to treat the SW from all surfaces at build -out?
Yes
4 Is the SCM located away from contaminated soils?
Yes
5 What are the side slopes of the SCM (H:V)?
:1
6 Does the SCM have retaining walls, gabion walls or other engineered
Yes
side slopes?
7 Are the inlets, outlets, and receiving stream protected from erosion
Yes
00-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?
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
13 If the SCM is on a single family lot, does (will?) the plat comply with
N/A
General MDC (10)
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
18 SHWT elevation (fmsl)
2080
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)
1460 cf
24 Will there be a permanent pool in the sediment chamber?
No
25 Bottom of the sediment chamber (fmsl)
2092.00
26 Area of the sediment chamber (square feet)
1516 sf
27 Physical depth of the sediment chamber (inches)
48 in
28 Ponding depth in the sediment chamber, above any permanent pool
24 in
(inches) ...
29 Elevation of top of weir between chambers (fmsl)
2097
Sand Chamber
30 Volume that can be retained in the sand chamber (cubic feet)
12835 cf
31 Bottom of the sand chamber (fmsl)
2092.00
32 Area of the sand chamber (square feet)
1516 sf
33 Physical depth of the sand chamber (inches)
48 in
34 Ponding depth in the sand chamber, above the sand surface
24 in
(inches)
35 Elevation of the bypass device (fmsl)
2094.08
36 Type of bypass device
Orifice & Weir
37 Mechanism for distributing flow over the sand surface
Multiple Inflows
38 Sand specification for sand chamber
ATSM C33 or
Equal
39 Depth above underdrain pipe (inches)
27 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
43 Please use this space to provide any additional information about the
sand filter(s):
indwater was not encountered in geotechnical investigation
Sand Filter 1 5:11 PM 11/24/2020