20070468 Ver 1_Worksheets_20070726

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1601 Mail Service Center
Raleigh, North Carolina 27699-1601
Phone: [phone]
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DATE 26-Jul-07 JOB NO. 2864
ATTENTION Annette Lucas, Environmental Engineer III
RE: Red Oak/Dortchess Park
Red Oak, North Carolina
SOLUTIONS
2 3 2 0
W. Morehead Street
Charlotte, NC 28208
WE ARE SENDING YOU
^ Shop drewings
^ Copy of letter
P 704.521.9880 F 704.521.8955
www.sitesolutionsoa. com
^~ Attached ^ Under separete cover via FedEx the following items:
^ Prints ^ Plans ^ Samples ^ Specifications
^ Change order (]
COPIES DATE NO. DESCRIPTION
1 08-Jun-07 1 Wet Pond Maintenance Agreement -executed copy
1 26-Jul-07 2 401 Wet Detention Basin Worksheet -executed original copy
1 26-Jul-07 3 Grassed Swale Worksheet -executed original copy
1 26-Jul-07 4 Swalw Calculations -signed/sealed copy

I rlt5t AKt I KHNJMI I t to as cnecKea Deiow:
^ For approval ^ Approved as submitted ^ Resubmit
^ For your use ^ Approved as noted ^ Submit
Q As requested ^ Returned for corrections ^ Return
^~ For review and comment ^
REMARKS
Annette, enclosed are the items that you had requested.
Respectfully submitted.
copies for approval
copies for distribution
corrected prints
coPY To: File SIGNED: Dave Rector

STORMWATER CONTROL STRUCTURE MAINTENANCE AGREEMENT
~ -o~~~
PROJECT: RED OAK/DORTCHESS PARK ~
RESPONSIBLE PARTY: TOWN OF RED OAK PHONE: [phone]
ADDRESS: 120 W. WASHINGTON ST.
NASHVILLE. NC 27856
1. Monthly or after every runoff producing rainfall, whichever comes first:
a. Remove debris from trash rack.
b. Check and clear orifice of any obstructions.
c. Check pond side slopes; remove trash, repair eroded areas before next rainfall.
II. Quarterly
a. Inspect the collection system (i.e. catch basin, piping, grassed swales) for proper functioning.
Clear accumulated trash from basin grates, and basin bottoms, and check piping for obstructions.
b. Check pond inlet pipes for undercutting. Repair if necessary.
c. Repair any broken pipes.
d. Replace rip rap that is choked with sediment.
Ill. Semi-Annually
a. Remove accumulated sediment from bottom of outlet structure.
b. Check pond depth at various locations. If depth is reduced to 75% of original design depth, remove
sediment to original design depth.
c. Reseed grassed swales twice yearly, Repair eroded areas immediately.
IV. General
a. A natural buffer is encouraged along the banks of the pond where appropriate. Annual mowing can
be used to maintain a low buffer. Vegetation along the dam should be mowed on a regular basis to
discourage root intrusion.
b. Wetland, plants are encouraged along pond perimeter, however, invasive species such as cattails
must be removed when they cover the entire surface area of pond.
c. All components of impoundment system to be kept in good working order.
d. In case the ownership of the Impoundment Transfers, the current owner shall, within thirty (30) days
of transfer of ownership, notify the Town of Red Oak of such ownership transfer.
e. This property and impoundment is also subject to the Operation and Maintenance Manual filed with
the register of deeds.
I, AL WESTER ,hereby acknowledge that on the behalf of the Town of Red Oak, I am
the financially responsible party for maintenance of this impoundment. The Town will perform the
maintenance as outlined above, as part of the Certificate of Compliance with Stormwater Regulations
received for this project.
Signature: ~~ Date: ~~ ~`~~~'~
AL WESTER, MAYOR
I, ~h~~-z- ~1kylS, a Notary Public for the State of I~dr'~- C.~ro f ~nc.~ County of ~~5~
do hereby certify that fll ~ c.~~-c~c' personally appeared before me this ~ day of
~u,~n,e._ _, 2007 and acknowledge due execution of the foregoing instrument. Witness my hand
and official seal,
JANICE EVANS ~
.NOTARY PUBLIC
Seal FAx couNTY N.c. My commission expires: ~ '"~ 8''o~Ol D

Project No. DWQ
o7-o~rl~4
(to be provided by DWQJ
DIVISION OF WATER QUALITY - 401 WET DETENTION BASIN WORKSHEET
DWQ Stormwater Management Plan Review:
A complete stormwater management plan submittal includes a wet detention basin worksheet for each basin,
design calculations, plans and specifications showing all basin and outlet structure details, 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.
I. PROJECT INFORMATION (please complete the following information):
Project Name : Red Oak/Dortchess Park
Contact Person: David P. Rector. PE Phone Number: (7042521-9880
For projects with multiple basins, specify which b asin this worksheet applies to: Single (1) pond
Basin Bottom Elevation 195.00 ft. (average elevation of the floor of the basin)
Permanent Pool Elevation 201.00 ft. (elevation of the orifice invert out)
Temporary Pool Elevation 201.35 ft. (elevation of the outlet structure invert in)

Permanent Pool Surface Area 27,850 sq. ft. (water surface area at permanent pool elevation)
Drainage Area 23.41 ac. (on-site and offsite drainage to the basin)
Impervious Area 2.81 ac. (on-site and offsite drainage to the basin)

Permanent Pool Volume 119,115 cu. ft. (combined volume of main basin and forebay)
Temporary Pool Volume 13,427 cu. ft. (volume detained on top of the permanent pool)
Forebay Volume 2,844 cu. ft.

SA/DA used 0.8 (surface area to drainage area ratio)
Diameter of Orifice 2.5 in. (draw down orifice diameter)
II. REQUIItED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stormwater Best Management Practices manual
(N.C. Department of Environment, Health, and Natural Resources, November 1995) and Administrative Code
Section: 15 A NCAC 2H .1008. 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.
Applicants Initials
DPR The temporary pool controls runoff from the 1 inch storm event.
N/A The basin length to width ratio is greater than 3:1.
DPR The basin side slopes are no greater than 3:1.
DPR A submerged and vegetated perimeter shelf at less than 6:1 is provided.
DPR Vegetation to the permanent pool elevation is specified.
DPR An emergency drain is provided to drain the basin.
DPR The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet).
DPR The temporary pool draws down in 2 to 5 days.
DPR The forebay volume is approximately equal to 20% of the total basin volume.
DPR Sediment storage is provided in the permanent pool.
DPR Access is provided for maintenance.
N/A A minimum 30-foot vegetative filter is provided at the outlet.
DPR A site specific operation and maintenance (O&M) plan is provided.
DPR A vegetation management/mowing schedule is provided in the O&M plan.
DPR Semi-annual inspections are specified in the O&M plan.
DPR A debris check is specified in the O&M plan to be performed after every storm event.
DPR A specific sediment clean-out benchmark is listed (elevation or depth) in O&M plan.
DPR A responsible party is designated in the O&M plan.
FORM S WG 100 09/97 Page 1 of 1

II. Required Items Checklist
Explanation of Requirements That Have Not Been Met
1. The basin length to width ratio is greater than 3:1.
The proposed pond configuration is more square than rectangular in shape. However, we have added a
forbay area for the "piped" discharge into the pond. The pond geometry is driven by existing site constraints
and the available area with the proposed park master plan.
2. A minimum 30-foot vegetative filter is provided at the outlet.
The 30 ft vegetative filter is not provided due to the proximity of the pond to the existing outfall (i. e. roadside
ditch for SR 1524 (Red Oak - Battleboro Road).

DWQ Project No.
DIVISION OF WATER QUALITY • GRASSED SWALE WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name:. Red OakiDortchess Park
Contact Person: David P. Rector, PE Phone Number: [phone] x3188
Swale ID: 1
Grass Swale Length 130 ft.
Tributary Drainage Area 1.16 ac.
Impervious Area 0.72 ac.

Max. Velocity from 2 Yr. Storm 1.46 fps
Max. Velocity from 10 Yr. Storm 2.31 fps
Min. Side Slopes 3:1 ratio

Steepest Effective Slope 1.08 ft/ft
Cover Crop Fescue
(at least 100 ft. per tributary acre)
(at least 100 ft. per tributary acre)
(at least 100 ft. per tributary acre)
(at least 100 ft. per tributary acre)
(at least 100 ft. per tributary acre)
(3:1 min.)
(check dams may be used)
II. REQUIRED ITEMS CHECKLIST
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
structures, 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
DPR Vegetation Plan provided on plans
DPR The underlaying soils are permeable and non-compacted
DPR Swale carries only stormwater flow
DPR Water table depth is greater than 1 foot
DPR Plan details for the swale are provided
DPR Plan details for the inlets and outlets are provided
DPR Check dams are provided
DPR The operation and maintenance agreement includes annual erosion and vegetation repair, and at
least twice annual mowing.
DPR The operation and maintenance agreement signed and notarized by the responsible party is
provided

R

Grassed Swa-e Capacity Analysis
Worksheet for Triangular Channel
Project Description
Project File g:\red oak\redoak_s.fm2
Worksheet Grassed Swale No. 1
Flow Element Triangular Channel
Method Manning's Formula
Solve For Discharge
Input Data
Mannings Coefficient 0.030
Channel Slope 0.010800 ft/ft
Depth 1.00 ft
Left Side Slope 3.000000 H : V
Right Side Slope 3.000000 H : V
Results
Discharge 9.39 cfs
Flow Area 3.00 ft2
Wetted Perimeter 6.32 ft
Top Width 6.00 ft
Critical Depth 0.91 ft
Critical Slope 0.018320 ft/ft
Velocity 3.13 ft/s
Velocity Head 0.15 ft
Specific Energy 1.15 ft
Froude Number 0.78
Flow is subcritical.
Notes:
Design Runoff Analysis:
Drainage Area, A = 1.16 Ac
Time of Conc, Tc = 5 Min
Wt'd Runoff Coefft, Cw = 0.70
(0.72 ac imperv at 0.95, 0.44 ac perv at 0.30)
Rainfall Intensity, 12 = 5.39 Ins/Hr
110 = 6.92 Ins/Hr
Q2 = 4.39 cfs (Q =CIA)
V2 = 4.39/3.00 = 1.46 ft/s (V= Q/a)
Q10=6.92 cfs
V10 = 2.31 ft/s
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07/26/07 Academic Edition FlowMaster v5.17
12:46:23 PM Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 [phone] Page 1 of 1

Cross Section
Cross Section for Triangular Channel
Project Description
Project File g:\red oak\redoak_s.fm2
Worksheet Grassed Swale No. 1
Flow Element Triangular Channel
Method Manning's Formula
Solve For Discharge
Section Data
Mannings Coefficient 0.030
Channel Slope 0.010800 ft/ft
Depth 1.00 ft
Left Side Slope 3.000000 H : V
Right Side Slope 3.000000 H : V
Discharge 9.39 cfs
1.00 ft
1
VD
H 1
NTS
07/26/07 Academic Edition FlowMaster v5.17
12:38:56 PM Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 (203} 755-1666 Page 1 of 1

Precipitation Frequency Data Server
' POINT PRECIPITATION ~`~~
FREQUENCY ESTIMATES ~~
FROM NOAA ATLAS 14 ~:M,,,,~..~
ROCKY MOUNT 6 SW, NORTH CAROLINA (31-7395) 35.91 N 77.8892 W 150 feet
from "Precipitation-Frequency Atlas of the United States" NOAA Atlas 14, Volume 2, Version 3
G.M. Bonnin, D. Martin, B. Lin, T. Parzybok, M.Yekta, and D. Riley
NOAA, National Weather Service, Silver Spring, Maryland, 2004
Extracted: Tue Mav 22 2007
Page 1 of 4
C
http://hdsc.nws.noaa.gov/cgi-bin/hdsc/buildout.perl?type=idf&series=pd&units=us&staten... 5/22/2007
Text version of table ~ These preapitation frequency estimates are based on a partial duration series. ARI is the Average Recurrence Interval.
Please refer to the documentation for more information. NOTE: Formatting forces estimates near zero to appear as zero.