20061855 Ver 2_More Info Received_20070710

^ ~ ^ Kimley-Horn
~ antl Associates, Inc,
July 9, 2007
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Attn: Ian McMillan
2321 Crabtree Blvd., Suite 250
Raleigh, NC 27604
Re: Wal-Mart Store No. 4447-00 Raleigh SE
NWP # 39 Request For More Information
Raleigh, Wake County, North Carolina
Dear Mr. McMillan:
Enclosed for your review is the additional information requested by NCDWQ on
July 5, 2007. If there is any additional information you need or any way we can
assist in expediting the processing of this application, please do not hesitate to
contact me at [phone].
Very truly yours,
Kimley-Horn and Associates, Inc.
~ ~-
Tommy Cousins
Q~~c~on~p
JUL 1 ,0 2001
wer °w~,E" ~ ~wr a~a
^
Suite 300
4651 Charlotte Park Drive
Charlotte, North Carolina
28217
^
TEL [phone]
FAX [phone]

DWOProjectNo. 06-1855, Ver. 2
DIVISION OF WATER QUALITY - 401 EXTENDED DETENTION (and POCKET*) WETLAND WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name: wa1-Mart Supercenter, Store No. 4447-00, Raleigh, NC
Contact Person: Austin watts, P.E. Phone Number:
For projects with multiple basins, specify which basin this worksheet applies to: n/a
Permanent Pool Elevation
Temporary Pool Elevation
Permanent Pool Surface Area
Drainage Area
Impervious Area
Forebay Surface Area
Marsh~9='-9'=Surface Area (0"-6")
Marsh~9"--48° Surface Area (6"-12")
Micro Pool Surface Area
222.00 ft
224 . oo ft.
40,390 sq. ft.
25.97 ac.
21.1s ac.
3,141 sq. ft.
14 , 416 sq. ft.
14 , 416 sq. ft.
s, 623 sq. ft.
Temporary Pool Volume sl, 751 cu. ft.
SAIDA used 3.42
Diameter of Orific 2.5 ~~ x 5.5 ~~ (Rectangular) in.
REQUIRED ITEMS CHECKLIST
(elevation of the orifice invert out)
(elevation of the outlet structure invert in)
(water surface area at permanent pool elevation)
(on-site and off-site drainage to the basin)
(on-site and off-site drainage to the basin)
(at permanent pool elevation approximately 15%)*
(at permanent pool elevation approximately 35%)*
(at permanent pool elevation approximately 35%)*
(at permanent pool elevation approximately 15%)*
(volume detained on top of the permanent pool)
(surface area to drainage area ratio)*
(draw down orifice diameter)
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes
a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed
drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for
additional information and will substantially delay final review and approval of the project
Aoolicants Initials
.Y/ The temporary pool controls runoff from the 1 inch rain.
/~/ The basin side slopes are no steeper than 3:1.
A planting plan for the marsh areas with plant species and densities is provided.
Vegetation above the permanent pool elevation is specified.
An emergency drain is provided to drain the basin.
The temporary pool draws down in 2 to 5 days.
~~ Sediment storage is provided in the permanent pool.
n/ a A sediment disposal area is provided. Sedimen# will be disposed of in an offsite landfill.
Access is provided for maintenance.
/L A site specific, signed and notarized operation and maintenance agreement is provided.
,~ The drainage area (including any offsite area) is delineated on a site plan.
,Qi Access is provided for maintenance.
Plan details for the wetland are provided.
Plan details for the inlet and outlet are provided.
A site specific operation and maintenance agreement, signed and notarized by the responsible party is provided (see
http:llh2o.ehnr.state.nc.uslncwetlandsloandm.doc).
* Pocket Wetlands have different design parameters and are only assumed to remove 35% TSS -See pp.19and 20 of the NC DENR
stormwater BMP Manual, April 1999.10% open water, 50% high marsh, 40% low marsh.
7041 319-5698

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