SW6211101_Supplement-EZ Form_20220311

SUPPLEMENT-EZ COVER PAGE
LOAD SUPPLEMENT FORMS
PROJECT INFORMATION
1 iProject Name
MASON RIDGE SUBDIVISION
1
5 1 Is this project High or Low DensW LVa'
6 1 Does this project use an off -site SCM? No
)MPLIANCE WITH 02H .1003(4)
7 Width of vegetated setbacks provided (feet)
8 Will the vregetated setback remain vegetated?
9 Is BUA other that as listed in .1003(4)(C-d) out of
0 Ils streambank stabilization proposed on this proj
NUMBER AND TYPE OF SCMs:
11 Mfiltration System _ _ 0
___
12 Bioretention Cell 0­___
13 Wet Pond -- _ 0_
14 Stormwater Wetland 0
15
Permeable Pavement
0
16
Sand Filter
0
17
Rainwater Harvesting RWH
0
18
Green Roof
0
19
Level Spreader- ifter Strip LS-FS
0
20
Disconnected Impervious Surface (DIS)
0
21
Treatment Swale
0
22
Dry Pond
0 —
23
StornFilter
0
24
Silva Cell
0
25
Bayfifter
0
2g
Fiiterra
0
LOAD SUPPLEMENT FORMS
DESIGNER CERTIFICATION
1 27 Name and Title: ___�_ KEN W. BRIGHT
Phone numbers): 919-776-3444
Email: kw bnght®kenbrightengin
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.
�0 Ess;ijpf 9
SEAL
17535
JAI oil 110
3
Date
•

DRAINAGE AREAS
1 Is this a high dens' project? No
2 If so, number of drainage areas/SCMs
Is all/part of this project subject to previous rule
3 versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site 1
4
Type of SCM
Swales
5
Total BUA in project (sq ft)
338300 sf
New BUA on subdivided lots (subject to permitting)
6
(sq ft
245000 sf
New BUA outside of subdivided lots (subject to
7permitting)
s
93300 sf
8
Offsite - total area (sq ft
9
Offsite BUA ft
10
Breakdown of new BUA outside subdivided lots:
--Parking s ft
- Sidewalk (sq ft
- Roof (sq ft
- Roadway s ft)
92300 sf
Futures ft
_ (_q__.).__—
Other, please specify in the comment box
below (sq ft
1000 sf
__
New infiltrating permeable pavement on
11
subdivided lots (sq ft
New infiltrating permeable pavement outside of
12
subdivided lots (sq ft
Exisitng BUA that will remain (not subject to
13permitting)
s it
sf
14
Existing BUA that is already permitted Lsq ft
15
Existing BUA that will be removed s ft
16
Percent BUA
23%
17
Design storm (inches)
18
Design volume of SCM (cu ft)
_.
19
Calculation method for design volume
ADDITIONAL INFORMATION
Please use this space to provide any additional information
about the
20 _drainage
area(sy
The "other" area is for the sidewalk and mail kiosk.
DRAINAGE AREA INFORMATION Entire Site 1
4
;Type of SCM
3. 38300 sf
3383 00 sf
r5
Total BUA from project (sq ft)
6
1995 rules
SL 2006-246
4
2008 rules
2017 rules
7
New BUA on subdivided lots (subject to
permitting) (sq ft)
245000 sf
245000 sf
1995 rules
SL 2006-246
2008 rules
2017 rules
8
New BUA outside of subdivided lots (subject to
permitting) (sf)
93300 sf
93300 sf
1995 rules

SL 2006-246
2008 rules
2017 rules
9
Oflsits - total area (sq ft)
1995 rules
SL 2006-246
2008 rules
2017 rules
10
Offsite BUA (sq ft)
1995 rules
SL 2006-246
2008 rules
2017 rules
11
Design storm (Inches)
rules
SL 2006-246
2008 rules
r1995
2017 rules
12
Breakdown of new BUA:
- Parking s ft
- Sidewalk (sq ft)
-Roof (sq ft) _
Roadway (sq ft)
Future Is q_ft
- Other, please specify in the comment box
' below (sq ft
92300 sf
92300 sf
1000 sf
1000 sf
13
New infiltrating permeable pavement on
subdivided lots (sq ft
14
New infiltrating permeable pavement outside of
subdivided lots (sq ft
15permitting)
Exisitng BUA that will remain (not subject to
s ft
16
Existing BUA that is already permitted (sq ft
17
Existing BUA that will be removed ft
18
Percent BUA
23%
23%
19
Design volume of SCM cu ft
20 Calculation method for design volume
ADDITIONAL INFORMATION
Please use this space to provide any additional
21 information about the drainage area(s):
The "other" area is for the sidewalk and mail kiosk.

LOW DENSITY
DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 021-1.1003
1 Is project below density thresholds set forth in the applicable stormwater rule?
2 Does project maximize dispersed flow and minimize channelization of flow?
3 Has the use of piping been minimized per .1003(2)(c)?
4 Side slopes of the vegetated conveyances (H:V)
5 Maximum velocity in the vegetated conveyances during the 10-year storm?
6 Are curb outlet swales proposed?
7 Maximum longitudinal slope of curb outlet swale(s) (%)
8 Bottom width of curb outlet swale(s) (feet)
9 Maximum side slope of curb outlet swale(s) (H:V
10 Minimum length of curb outlet swale(s) (feet)
11 Are treatment swales used instead of curb outlet swales?
12 Is stormwater released at the edge of the setback as dispersed flow?
13 Have stormwater outlets been designed to prevent downslope erosion?
14 'Are variations to rule .1003 proposed?
ADDITIONAL INFORMATION
15 Please use this space to provide any additional information about this low density project:
Maximum velocity in the swales is 2.68 ft/sec
Yes
-------Yes
Yes
4:1
No
Yes
Yes
No
Swale
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