SW6190802_2020-01-05 Supplement Form_1/5/2020

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
.PROJECT INFORMATION
1
Project Name
Four Sierra Ranch
10
2
Project Area ac
Coastal Wetland Area ac
3
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[4j
7
Width of vegetated setbacks provided feet
8
Will the vegetated setback remain vegetated?
Yes
9
Is BUA other that as listed in .1 0034 c-d out of the setback?
Yes
10
Is streambank stabilization proposed on this project?
No
NUMBER AND TYPE OF SCMs:
11
Infiltration System
Bioretention Cell
1
12
0
0
0
13
Wet Pond
14
Stormwater Wetland
15
Permeable Pavement
0
16
Sand Filter
0
17
Rainwater Harvesting RWH
0
18
Green Roof
0
19
Level Spreader -Filter Strip LS-F5
0
20
Disconnected Impervious Surface (DIS)
0
21
Treatment Swale
0
22
Da Pond
0
23
StormFilter
0
24
Silva Cell
0
25
Ba filter
0
26 1
Filterra
0
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
Jeffrey A, Nobles, PE
Larry King & Associates, RLS, PA
28
JOrganization.
29
Street address:
1333 Morganton Road Suite 201
30
City, tateZip:
Fayetteville, NC 28305
31
Phone numbe s : _
Email:
910-483-4300
32
_
[e-mail]
Certification Statement:
I certify, under penalty of law that this Supplement-FZ 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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DRAINAGE AREAS
1 Jjs this a high den ity project? Yes
2 If so, number of drainage areas/SCMs 1
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
Infil Basin
266341 sf
27885 sf
5
Total BUA in ro ect ft
71776 sf
6
New BUA on subdivided lots (subje7topermitting)
s ft
58500 sf
13276 sf
7
New BUA outside of subdivided lots (subject to
rmitting) (so
11391 sf
8
Offsite - total area Lsq ft
sf
sf
9
Offsite BUA (sq ft
sf
sf
10
Breakdown of new BUA outside subdivided lots:
Parking (sq ft
sf
sf
Sidewalk (sq ft
sf
sf
Roofs ft
sf
sf
Roadway (sq ft
13276 sf
11391 sf
Future (sq ft
sf
sf
Other, please specify in the comment box
below ft
sf
sf
11
New infiltrating permeable pavement on
subdivided lots ft
sf
sf
12
New infiltrating permeable pavement outside of
subdivided lots s ft
Exisitng BUA that will remain (not subject to
s ft
Existing BUA that is already permitted tt
sf
sf
13permitting)
sf
sf
14
sf
sf
sf
15
Existing BUA that will be removed (sq ft
sf
16
Percent BUA
16%
16%
17
Desi n storm inches
1 in
1 in
18 1
Design volume of SCM cu ft
6493 cf
6493 cf
19 1
Calculation method for design volume
Simple Method
Simple Method
DDITIIONAL INFORMATION
Please use this space to provide any additional information about the
20 draina a area(s):

INFILTRATION SYSTEM
1 Drainage area number
2I Design volume of SCM (cu ft)
UKRAL MQC FROM 021-1.1050
3 Is the SCM sized to treat the SW from all surfaces at build -out?
4 Is the SCM located away from contaminated soils?
5 What are the side slopes of the SCM (H:V)?
6 Does the SCM have retaining walls, gabion walls or other engineere
7 Are the inlets, outlets, and receiving stream protected from erosion 1
8 Is there an overflow or bypass for inflow volume in excess of the de:
9 What is the method for dewatering the SCM for maintenance?
10 If applicable, will the SCM be cleaned out after construction?
11 Does the maintenance access comply with General MDC (8)?
12 Does the drainage easement comply with General MDC (9)?
If the SCM is on a single family lot, does (will?) the plat comply with
13 (10)?
14 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 designed by an NC licensed professional?
NFILTRATION SYSTEM Mnt FRf3M 02H .7r1S7
side
volume?
General MDC
1
Yes
Yes
3:1
No
Yes
No
Pump (preferred)
Yes
Yes
Yes
Yes
Yes
Yes
18
Proposed sfope of the subgrade surface (%)
0%
19
Are terraces or baffles provided?
No
20
Type of pretreatment:
Forebay
I Sails Data
21
Was the soil investigated in the footprint and at the elevation of the infiltration
system?
Yes
22
SHWT elevation (fmsl)
Avg 155.07
23
Depth to SHWT per soils report (in)
>120
24
Ground elevation at boring in soils report (fmsl)
165.20
25
Is a detailed hydrogeologic study attached if the separation is between 1 and 2 feet?
26
Soil infiltration rate (inlhr)
0.24
27 IFactor
of safety (FS) (2 is recommended):
2.00
crerveruwis
29 Bottom elevation (fmsl) 159 ft
30 IStorage elevation (fmsl) 165. ft
31 jBypass elevation (fmsl)
For Basins Oral
32 Bottom surface area, ff : 12747 ft
33 jStorage elevation surface area (ft2) 13000. ft
For Trenches Only
34 Length (ft)
35 Width (ft)
36 Perforated pipe diameter, if applicable (inches)
37 Number of laterals
38 Total length of perforated piping
39 Stone type, if applicable
40 Stone void ratio (%)
41 Is stone free of fines?
42 Is the stone wrapped in geotextile fabric?
43 Has at least one infiltration port been provided?
Volumes/Drawdown
44 Design volume of SCM (cu ft) 6493 cf
_ 45 Time to drawdown (hours) 47 hrs
X750FTIONAL INFORMATION
Please use this space to provide any additional information about the infiltration
46 system(s):
Infiltration 1 6755 PM 11517n2n