20041801 Ver 1_Stormwater Info_20051021

IWK
LETTER OF TRANSMITTAL WDICKSON
community infrastructure consultants
3101 John Humphries Wynd Raleigh, North Carolina 27612 919.782.0495 tel. [phone] fax
TO: NC Division of Water Quality
Wetlands/401 Unit
1650 MSC
Raleigh, NC 27699-1650
ATTENTION: Mr. Sam Aehimien
DATE: 10/21/05
RE: Ford's Colony at Rocky Mount
DWQ Project No. 04-1801
WKD# 40371.00.RA
We are sending via: ? Overnight ? Regular Mail ? Pick-up ® Hand Delivered
The following items: ? Correspondence ? Plans ? Specifications ® Other as listed below:
COPIES DATE NO. I DESCRIPTION
1 NA NA October 21, 2005 Letter requesting a waiver for the proposed forebay. 1
THESE ARE TRANSMITTED as checked below:
? For Approval ® As Requested ? Approved as Submitted ? Returned for Corrections
? For Your Use ® For Review and Comment ? Approved as Noted ? Forward to Subcontractor
REMARKS:
OCT 2 1. ZOOS
DENR - WATER QUALITY
WETLANDS AND STORMWATER BRANCH
P
WDICKSON
community infrastructure consultants
October 21, 2005
Mr. Sam Aghimien
Environmental Engineer II
NC DENR/Division of Water Quality, Wetlands Unit
1650 Mail Service Center
Raleigh, NC 27699-1650
OCT 2 S_ N05
,_.tNR -WATER QUALITY
(,_jVj rS AND STORMWATER BRANCH
Re: Ford's Colony at Rocky Mount - 401 Water Quality Certification - Focus Area #1 -
Clubhouse Pond
Dear Mr. Aghimien:
On behalf of the Ford's Colony at Rocky Mount development, WK Dickson is formally requesting a
waiver for the required forebay volume at the Clubhouse Pond in Focus Area #1. We feel that the
proposed Clubhouse Pond should exceed minimum design standards for a wet pond. The subject
forebay has been designed to be 20% of the minimum reservoir volume needed to meet Division of
Water Quality (DWQ) requirements for a wet pond. The minimum reservoir volume was determined
based on the percent imperviousness of the upstream drainage area as described in the DWQ design
manual "Stormwater Best Management Practices", dated April 1999. The reservoir or aft bay of the
pond was enlarged beyond the minimum required sized due to aesthetic needs of the project as
dictated by the landscape architect for the development.
We have attached design spreadsheets, a DWQ worksheet and a stormwater plan of the pond in
question for your review. Although the aft bay portion of the pond is larger than the minimum pond
needed, we feel that the proposed pond meets DWQ's requirements to treat water quality and the
forebay is appropriately sized. Prior to our recent submittal we spoke with Mr. Boyd DeVane of DWQ
and asked if it would be acceptable to provide a permanent pool volume larger than the volume
determined using the standard DWQ approach. Mr. DeVane spoke with Mr. Bradley Bennett of DWQ
and they indicated that this would be acceptable. The following is a summary for the wet pond design
parameters:
• Drainage Area - 16.65 acres.
• Impervious Area - 10.69 acres.
• Impervious % - 64.2.
• Minimum Required Surface Area - 17,266 square feet.
• Minimum Required Reservoir Volume - 60,254 cubic feet.
• Minimum Required Forebay Volume - 12,033 cubic feet (20% of minimum required reservoir
volume).
Provided (proposed) Surface Area - 22,650 square feet.'
?, -
} Q 4_-,
Gcor is Florida
• Provided (proposed) Reservoir Volume - 79,044 cubic feet.
• Provided (proposed) Forebay Volume - 12, 033 cubic feet.
With this letter we request your approval of the proposed forebay and aft bay for the Clubhouse Pond.
We appreciate your help with this matter and if any additional information is required or you have any
questions, please contact me at 919-782-0495.
Sincerely,
Co., Inc.
W.K. DicksP411
c4,, David Kiker, P.E.
Project Manager, WK Dickson
Attachments
Gcr(ll , a Notary Public for the State of N I' fi 1 ?? I' 111 ?L
County of Lti' i, K do hereby certify that
l, personally appeared before me this Zl S' day of t"UhT) N V
S and acknowledge the due execution of the forgoing water quality treatment device
maintenance requirements. Witness my hand and official seal,
T. CO
pUB`?G ?V.

SEAL
My commission expires `f 1$} (J ?'
W,.?WK
WDICKSON
community infrastructure consultants
TELEPHONE CONVERSATION RECORD
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Project No. DWO 0'{- mo ll (to be provided by DWQ)
DIVISION OF WATER QUALITY - 401 WET DETENTION BASIN WORKSHEET
DWO Stormwater Management Plan Review:
1. PROJECT INFORMATION (please complete the following information):
Project Name : R `5 GOt k e me
Contact Person: Phone Number:
For projects with multiple basins, specify which basin this worksheet applies to:
Basin Bottom Elevation
Permanent Pool Elevation
Temporary Pool Elevation
Permanent Pool Surface Area
Drainage Area
Impervious Area
10.00 ft.
9S oc> ft.
yG•(o? ft.
2&650 sq. ft.
16.45 ac.
10.69 ac.
Permanent Pool Volume ?guot?e?) 19, 044 A--Cu. ft.
Temporary Pool Volume A LOO cu. ft.
Forebay Volume 12.032 * cu. ft.
SA/DA used
Diameter of Orifice
z.33
z.5 in.
(average elevation of the floor of the basin)
(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)
4p 1 Z54 muJ k0QOik-1
(combined volume of main basin and forebay)
(volume detained on top of the permanent pool)
ik,A'l kwL = 60, 454 Ft 3
(surface area to drainage area ratio)
(draw down orifice diameter)
II. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stormwater Best Management Practices Manual. 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
The temporary pool controls runoff from the 1 inch storm event.
The basin length to width ratio is greater than 3:1.
WK The basin side slopes are no steeper than 3:1.
A submerged and vegetated perimeter shelf at less than 6:1 is provided.
Vegetation to the permanent pool elevation is specified.
be An emergency drain is provided to drain the basin.
Wr The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet).
The temporary pool draws down in 2 to 5 days.
The forebay volume is approximately equal to 20% of the total basin volume.
Sediment storage is provided in the permanent pool.
e'G Access is provided for maintenance.
A notarized site specific operation and maintenance (0&M) plan is provided.
A vegetation management/mowing schedule is provided in the 0&M plan.
Semi-annual inspections are specified in the 0&M plan.
A debris check is specified in the 0&M plan to be performed after every storm event.
?tC A specific sediment clean-out benchmark is listed (elevation or depth) in 0&M plan.
Z1itC A responsible party is designated in the 0&M plan.
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