20061223 Ver 2_More Info Received_20070219

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Matpass & Associates
," Engineering and Planning
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To: NCDENR
^ Under separate cover via
^ Plans ^
NCDWQ-401 DIVISION
2321 CRABTREE BLVD
RALEIGH, NC 27604
WE ARE SENDING YOU:
^ Shop drawings
^ Gopy of Letter
Attached
^ Prints
^ Change Order
Letter of Transmittal
Date: 2!16/2007
Attention: Annette Lucas
Rec BROOKSTONE SUBDIVISION
Job No P-776
the following items
Samples ^ Specfications
FEB 1 9 2007
Df=iVf~ - WATE(2 QUALITY
~ETlAN0.4 A,~D STORAi1NATER Bi2AlJCh
Co ies Date No. Description
1 2!16/2007 Wetland Worksheet Wetland #1
1 2/16/2007 Wetland Worksheet Wetland #2
3 2/16/2007 Broakstone Subdivision Construction Plans

THESE ARE TRANSMITTED As Checked Below:
For Approval ^ Approved As Submitted
^ For Your Use ^ Approved As Noted
^ As requested ^ Returned for corrections
^ For review and comment ^
^ FOR BIDS DUE
^ Resubmit copies far approval
^ Submit copies for distribution
^ Return corrected prints
REMARKS
^ PRINTS RETURNED AFTER LOAN TO US
Ms. Lucas
The wetlands have been revised per our conversatson on 02/15/07. The worksheets have been updated as have the
planting plan and outlet details. Please iet me know, as soon as possible, if there is anything else you need.
Thank you,
Jamie Midgette
COPY TO: Flle
' SIGNED: d.t..~J
If enclosures are not as noted, kindly notify us at once.

DWQ Project No.
DIVISION OF WATER QUALITY -401 EXTENDED DETENTION (and POCKET*) WETLAND WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name : BROOKSTONE SUBDIVISION
Contact Person: JAMIE MIDGETTE Phone Number: [phone]
For projects with multiple basins, specify which basin this worksheet applies to: WETLAND 1 -WEST OF STREAM
Permanent Pool Elevation
Temporary Pool Elevation
Permanent Pool Surface Area
Drainage Area
Impervious Area
Forebay Surface Area
Marsh 0"-9" Surface Area
Marsh 9"-18" Surface Area
Micro Pool Surface Area
Temporary Pool Volume
~ , SAIDA used
Diameter of Orifice
II. REQUIRED ITEMS CHECKLIST
48.00 ft. (elevation of the orifice invert out)
49.12 ft. (elevation of the outlet structure invert in)

9,496 sq. ft. (water surface area at permanent pool elevation)
15.89 ac. (on-site and off-site drainage to the basin)
3.89 ac. (on-site and off-site drainage to the basin)
1.568 sq. ft. (at permanent pool elevation approximately 15°~)*
3,310 sq. ft. (at permanent pool elevation approximately 35%)*
3.101 sq. ft. (at permanent pool elevation approximately 35%)*
1,517 sq. ft. (at permanent pool elevation approximately 15%)*

15,250 cu. ft. (volume detained on top of the permanent pool)

1.4 (surface area to drainage area ratio)*
1.5 in. (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
Applicants Initials
/li7 The temporary pool controls runoff from the 1 inch rain.
~~ The basin side slopes are no steeper than 3:1.
/lh A planting plan for the marsh areas with plant species and densities is provided.
/lint Vegetation above the permanent pool elevation is specified.
d~ An emergency drain is provided to drain the basin.
~ The temporary pool draws down in 2 to 5 days.
/lip'! Sediment storage is provided in the permanent pool.
/I'rl A sediment disposal area is provided.
/]!'7 Access is provided for maintenance.
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.
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:/m2o.ehnr.state.nc.usincwetlands/oandm.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°k low marsh.