20000664 Ver 2_More Info Received_20070316

Environmental Consultants, PA
;Road Raleigh, North Carolina 27614 Phone: [phone] Fax: [phone]
March 15, 2007
S&EC Project #3034.W4
DWQ Project #00-0664v2
Department of Environment and Natural Resources
Division of Water Quality
Attn: Cyndi Karoly
2321 Crabtree Boulevard, Suite 250 (~ (~~/J
Raleigh, NC 27604 ~ l5~ ~ 1~ `.~f ~ D
Re: Reply to the Division of Water Quality's Request for More Information MAR l ~ 20(17
Land Bay U-Brier Creek Country Club ~r~R.w~~i;HOJ`y~',~
Raleigh, Wake County, NC ~,,~'TMIII~MI~~~i~#wvd~aH
Dear Mrs. Karoly:
The purpose of this letter is to respond to your Request for More Information letter dated.
February 19, 2007. The original questions/requests are copied below as they appear within
letter and are then followed by our response.
Additional Information Requested:
1. Geotechnical Report
Your geotechnical report references auger refusal at a depth of 13ft. You must reach
bedrock at a depth of 3-5 feet in order to have the required soils to allow for a bottomless
culvert per, Division of Highways-Guidelines For Drainage Studies and Hydraulic
Design-prepared by A.L. Hankins, Jr., PE State Hydraulics Engineer-1999. This report
states, "When a .shallow (3-5 ft. max. depth) non-erosive rock foundation is found
throughout the proposed site, the structure can be built on footings without a bottom
allowing. retention of the natural channel bed. Please revise your plans to show you are not
using a bottomless culvert in the proposed location.
This open bottom culvert was constructed in November 2006. Through correspondence
with Tom Reeder, it has been confirmed that no additional information is needed for this
item.
2. Diffuse Flow
On February 6, 2007, DWQ had a meeting with you to discuss the possible alternatives for
diffuse flow at your site. Please submit the revised plan sheets reflecting the diffuse flow
provisions discussed in the meeting. Also, be sure to include all applicable worksheets and
operations and maintenance agreements.
In our February 6, 2007 meeting, we agreed on a modified plunge pool at the outlet
points along the retaining wall. Attached is a typical cross-section for this devise. In
addition, we have included a signed and notarized operations & maintenance agreement
for these devises. There are no additional areas of concentrated flow directed towards a
Charlotte Office: Greensboro Office:
236 LePhillip Court, Suite C 3817-E Lawndale Drive
Concord, NC 28025 Greensboro, NC 27455
Phone: [phone] Phone: [phone]
Fax: [phone] Fax: [phone]

riparian buffer for this project; the diversion ditch shown on sheet 5 of 7 is temporary.
After final design of this adjacent parcel, the future, proposed Helmond Way will include
a permanent diffuse flow measure/BMP for review and approval by the NCDWQ.
We anticipate that this answers all of the DWQ's questions in order to complete the final review
process fora 401 Water Quality Certification. If you have any further questions or any
additional explanation is needed, please don't hesitate to call.
Sincerely,
Debbie Edwards
Environmental Specialist
CC:
Martin Fuchs-Toll Brothers Inc., 2310 TW Alexander Dr. Suite G, Raleigh, NC 27617
Keith Fenn-The John R. McAdams Co. Inc., 2905 Meridian Parkway, Durham, NC 27713
Attachments:
1) Impact maps (sheets 1-7)
2) Signed and notarized Operations & Maintenance Agreement
- ---1

Y 2~ oo- o~~~{
MODIFIED PLUNGE POOL OPERATION AND MAINTENANCE AGREEMENT
The modified plunge pool is defined as a bedding of class B rip-rap with turf reinforcement liner,
designed to diffuse stormwater runoff exiting the retaining wall at five points.
Maintenance activities shall be performed as follows:
1. After construction and until vegetation has been established, modified plunge pool(s)
shall be inspected after every rainfall. Thereafter, modified plunge pool(s) shall be
inspected at least every month and more frequently during the fall season and after heavy
rainfall events:
a. Accumulated sediment, leaves, and trash shall be removed, and repairs made if
required.
b. Inspect modified plunge pool(s) for evidence of scour, undercutting, settlement of
the structure, and concentrated flows downhill from the modified plunge pool(s).
c. A level elevation shall be maintained across the entire flow-spreading structure at all
times. Repair or replace the modified plunge pool if it is damaged.
d. Mow vegetative cover to a height of six (6) inches and prune plants if they cover
over half of the modified plunge pool surface.
e. Repair eroded areas and replace/replant dead or damaged vegetation.
2. The contractor should avoid the placement of any material on and prevent construction
traffic across the structure. If the measure is damaged by construction traffic, it shall be
repaired immediately.
3. Inspect and repair the collection system (e.g., catch basins, pipes, swales, riprap) four (4)
times a year to maintain proper functioning.
I acknowledge and agree by my signature below that I am responsible for the performance of the
maintenance procedures listed above. I agree to notify DWQ of any problems with the system or
prior to any changes to the system or responsible party.
Print name: {~,~,Y.-F-, ~ ~1.~ ~ .L~ `~
Title: L.ct.n~t ~~~~ac~~~~ ~~~~~x~~~ /
Address: •Z~to ~vJ ~~r~~.~l,~,~ ~3-r. '2~~1T-a~,M Nc 2~co~~-
Phone: (~ i~ ~3Z1 ,,'~~c~~
Signature: /~~ ~-~,~-~i~-
Date: ,S//y/c^ ~'
Note: The legally responsible party should not be a homeowners association unless more than 50%
of the lots have been sold and a resident of the subdivision has been named the president.
I, ~~~~ ~-{, L . C~-u-~-v~~,l~~- , a Notary Public for the State of I`~~ r--F4~ C~r~~,~ rte.
County of W«1~- , do hereby certify that 1'Y~GL.r--}-,,,~ ~~;~hS
personally appeared before me this day of YV~«~ ch ~%-I z~c~~-, and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand
and official seal, ~~~,.,~,' L , C~I~1~
~`' ' LIC
'fir . r ~~~I"i ' N.G.
---
SEAL My commission expires S- ~~ - ~`~
Page 1 of 1

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