SW6130203_Supplement Form_20130422

-.
Permit No.
(to be Provided by DWD)
AA WArfq
mIr o2 OG
♦�!^ STORMWATER MANAGEMENT PERMIT APPLICATION FORM p�C 'c
NCDENR 401 CERTIFICATION APPLICATION FORM I
INFILTRATION BASIN SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part W) must be printed, filled out and submitted along with all of the required information.
Project Name
Contact Person
Phone Number
Dale
Drainage Area Number
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 discharge
Post -development 1-yr, 24-hr discharge
Pre/Post 1-yr, 24-hr peak flow control
Storage Volume: Non -SA Waters
Minimum design volume required
Design volume provided
Storage Volume: SA Waters
1.5' runoff volume
Pre -development 1-yr, 24-hr runoff volume
Post -development 1-yr, 24-hr runoff volume
Minimum required volume
Volume provided
Soils Report Summary
Soil type
Infiltration rate
SHWT elevation
Basin Design Parameters
Drawdown time
Basin side slopes
Basin bottom elevation
Storage elevation
Storage Surface Area
Top elevation
Basin Bottom Dimensions
Basin length
Basin width
Bottom Surface Area
Store #705283
919-390-4227
2/15/2013
72,310.00 ftz
45,910.00 flz
63.49 %
1.00 in
Jun In
0.13 in/hr
1.50 ft3/seC
0.00 RI/sec
-1.50 ft3/sec
3,826.00 ft3
8,778.00 It'
ft3
ft3
ft3
ft3
W
I
I
I
OK for non -SA waters
Lakeland Sand
8.07
infhr
417.00
first
0.25
days OK
3
1 OK /
428.08.00
fmsl OK ✓/
430.50
first /
5,765.00
f?
431.50
first
235.00 It
8.00 It
1,885.00 flz
Foon SW401-Infinration Basin-Rev.S 11Ap2011 Palls 1. a IL Design Summary, Page 1 of 2

Permit
(to be provided by DWQ)
Additional Information
Maximum runoff to each inlet to the basin?
1.01
ac-in
OK
Length of vegetative filter for overflow
NIA
it
OK
Distance to structure
16.00
it
OK
Distance from surface waters
NIA
it
OK
Distance from water supply well(s)
NIA
it
OK
Separation from impervious soil layer
12.00
it
OK
Naturally occuring soil above shwt
12.00
it
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
iwales, Catch Basins and Energy Dissipator
Fonn SW401-Infiltration Basin-Rev.5 11Ap2011 Parts I. E 11. Design Summary, Page 2 of 2

Permit
(to be provided by DWQ)
III. REQUIRED ITEMS CHECKLIST
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.
Pagel Plan
iti s Sheet No.
1. Plans (1" - 50' 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),
- Basin dimensions,
- Pretreatment system,
- High flow bypass system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROW),
- Overflow device, and
�.-1 - Boundaries of drainage easement.
� 1 2. Partial plan (1" = 30' or larger) and details for the infiltration basin showing:
- Bypass structure,
- Maintenance access,
- Basin bottom dimensions,
- Basin cross-section with benchmark for sediment cleanout,
- Flow distribution detail for inflow,
- Vegetated filter, and
- Pretreatment device.
3. Section view of the infiltration basin (1" = 20' or larger) showing:
- Pretreatment and treatment areas, and
c,•'_' - Inlet and outlet structures.
J 4. A table of elevations, areas, incremental volumes & accumulated volumes to verify the volume provided.
V C& tom! 5. A soils report that is based upon an actual field investigation, soil bodngs, 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.
6. A construction sequence that shows how the infiflration basin will be protected from sediment until the
/� entire drainage area is stabilized.
lI0 J/ 7. The supporting calculations.
�"
8. A copy of the signed and notarized operation and maintenance (0&M) 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