SW6120802_401 Certification Application_20120822

Permit No. 51V (� 1 ZD F CV -
NCDENR
The
Project Name
Contact Person
Phone Number
Date
Drainage Area Number
Site Characteristics
Drainage area
Impervious area
Percent impervious
Design rainfall depth
Peak Flow Calculations
1-yr, 24-hr rainfall depth
1-yr, 24-hr intensity
Pre -development 1-yr, 24-hr
Post -development 1-yr, 24-h
Pre/Post 1-yr, 24-hr peak flo
Storage Volume: Non -SA L
Minimum design volume req
Design volume provided
Storage Volume: SA Wate
1,5' runoff volume
Pre -development 1-yr, 24-hr
Post -development 1-yr, 24-h
Minimum required volume
Volume provided
Soils Report Summary
Soil type
Infiltration rate
SHWT elevation
Basin Design Parameters
Dmwdown time
Basin side slopes
Basin bottom elevation
Storage elevation
Storage Surface Area
Top elevation
Basin Bottom Dimensions
Basin length
Basin width
Bottom Surface Area
(to be provided by DWQ)
Qp h r�R
Or CG
STORMWATER MANAGEMENT PERMIT APPLICATION DORM
401 CERTIFICATION APPLICATION FORM p T
INFILTRATION BASIN SUPPLEMENT
This form must be filled out, printed and submitted.
Items Checklist (Part Ill) most be printed, titled out and submitted along with all of the required information.
So}angles'
Michael O'Rourke
704-527-3440
Post -Developed Area #1
45,239.00 q2
35,409.00 ft2
78.27 %
1.00 in
3.02 in
0.13 inmr
ischarge 0.12 0sec
discharge 3.90 ffJlsec
control 3,78 Wisec
atered 7,088,00 fe 21 %� o r FUG
fe OK for non -SA waters
unoff volume
runoff volume
NIA
fl'
0.00
W
0.00
ft3
NIA
ff3
NIA
ft 3
OK
NoB
1.26 inlhr
158.65 fmsl
0% hv.
5,00 days OK ?,vS
3.00 A OK ,E �� ( oA/
161.00 fm51 OK}��tS
6,605.00 (f2
164.00 fmsl
120.00 It
40.00 #t , r
4,510,00 ft2
Form SW401-Infiltration Bann-Rev,5 1 Mpr2011 Parts I. & II. Design Summary, Page 1 of 2

Permit No.
(to be pru'lWed by DWQp
Additional Information
Maximum runoff to each inlet to the basin?
0.82
ac-in
OK
Length of vegetative filter for overflow
N/A
ft
OK
Distance to structure
80.00
tt
OK
Distance from surface waters
>50
ft
OK
Distance from water supply well(s)
>100
€t
OK
Separation from impervious soil layer
4.00
ft
Ott
Naturally occuring soil above shwt
4.33
ft
OK
Bottom covered with 4-in of clean sand?
Y
(Y or N)
OK
Proposed drainage easement provided?
Y
(Y or N)
OK
Capures all runoff at ultimate build -out?
Y
(Y or N)
OK
Bypass provided for larger storms?
Y
(Y or N)
OK
Pretreatment device provided
Forebay
off-line bypass
& ve etaled filter strip waived - infiltrate 2.5 x WQv @ 0.5K
Glrtf�z
Form SW401-Infiltration Basin-Rev.5 11Apr2011 Parts t. & U. Design Summary, Page 2 of 2

(to be provided by DWQ)
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Page/ Plan
Initials Sheet No.
r
5 AJ0 1. Plans (1" - 54' or larger) of the entire site showing:
Design at ultimate build -out,
Off -site drainage (if applicable),
Delineated drainage basins (include Rational C coefficient per basin), Saf- :%fEM C(6.0 r �•�
- Basin dimensions,
Pretreatment system,
High flow bypass system,
- Maintenance access,
Proposed drainage easement and public right of way (ROW).
Overflow device, and
Boundaries of drainage easement.
C3.0 2. Partial plan (1" = 30' or larger) and details for the infiltration basin showing:
C4.0 Bypass structure,
Maintenance access,
- Basin bottom dimensions,
- Basin cross-section with benchmark for sediment cleanout,
Flow distribution detail for inflow,
-Vegetated filter, and swe tAAm a 0w Skear C4•0
- Pretreatment device.
C3'b 3. Section view of the infiltration basfn (1' = 20' or larger) showing:
C.5.1 -Pretreatment and treatment areas, and SEA t*W-113VE ON SRiE�r Gq'd
- Inlet and outlet structures.
4. A table of elevations, areas, incremental volumes & accumulated volumes to verify the volume provided.
5. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. The
results of the soils report must be verified in the field by DWQ, by completing & submitting the soils
investigation request form. County soil maps are not an acceptable source of soils information.
C14• O 6. A construction sequence that shows how the infiltration basin will be protected from sediment until the
entire drainage area is stabilized.
ArjoEr,> 7. The supporting calcu}ations.
M8. A copy of the signed and notarized operation and maintenance (00) agreement.
9. A copy of the deed restrictions (if required).
Form SW401-Infiltration Basin-Rev.4 Page 1 of 1 Part III. Required Items Checklist. Page 1 of 1