20050054 Ver 2_More Info Received_20110603

~~~
~~~
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins Dee Freeman
Governor
Director Secretary
May 13, 2011
DWQ Project # 2005-0054v2
L~~LS~~~r t3'
CERTIFIED MAIL: RETURN RECEII'T REQUESTED
KB Home-Carolinas Division JUN ~ 2 ~ ~ ~ ~
Attn: Mr. Ryan Jackson r
8161 Brier Creek Pkwy DENR . Gyp k UAL
Raleigh, NC 27617 w°p°^~ ~ star Branch
Subject Property: Twin Lakes Stormwater Best Management Practice (BMP) and E Greenway
Trail
UT Crabtree Creek [030402, 27-33-(10), C, NSW)
REQUEST FOR MORE INFORMATION
Dear Mr. Jackson:
On Apri17, 2011, the Division of Water Quality (DWQ) received your application dated A~ri15, 2011 to
impact 1,587 square feet (ft2) of Zone 1 protected riparian buffers and 1,590 square feet (ft) of Zone 2
protected riparian buffers to construct the proposed stormwater BMP and greenway trail. The DWQ has
determined that your application was incomplete and/or provided inaccurate information as discussed
below. The DWQ will require additional information in order to process your application to impact
protected wetlands and/or streams on the subject property. Therefore, unless we receive five copies of the
additional information requested below, we will place this project on hold as incomplete until we receive
this additional information. If we do not receive the requested information, your project will be formally
returned as incomplete. Please provide the following information so that we may continue to review your
project.
Additional Information Requested:
r~l. Please provide a full-size plan sheet showing the design of the proposed greenway, including one-
foot proposed topographic lines. Include on the plan sheet any swales that are being installed to
drain the greenway. If swales (or other stormwater conveyances) are being installed, then please
show how diffuse flow requirements have been met at every proposed outlet location via a level
spreader or other appropriate design per Chapter 8 of the BMP Manual.
1~2. Please provide one Level Spreader Supplement Farm for each proposed level spreader, available
at: htto:/lportal.ncdenr or web/wq/ws/su/bmp manual. Please include the Requited Items
checklist and all items listed therein.
V 3. One (1) data CD of full size plans in TIFF Group 4 format (black and white, not grayscale or
color). If the plans are too large to store in TIFF format, they can be stored in PDF format.
Wetlands, Buffers, Stormwater, Compliance and Permitting Unit (WeBSCaPe)
1650 Mail Service Center, Raleigh, North Carolina 27699-1650 *~
Phone [phone] FAX: [phone]~1 a CEO •na
Internet: hllp:h'porlal ncdenr.org/web/wglws ~r /
An Equal Opportunity 1 Ai*firmalive Action Employer ~tu` a' r`~
1

Strickland, Bev
From: Lucas, Annette
Sent: Thursday, June 02, 2011 9:33 AM
To: Strickland, Bev
Subject: FW: KB Home Twin Lakes Buffer Authorization
Attachments: 2011-06-31 Greenway Area #9 Buffer Impact.pdf; 2011-06-01 Greenway Area #4 & #9.pdf;
2011-06-01 Greenway Area #9 DWQ LS Design.pdf
In case these are helpful to you.
From: Timothy Nau [mailto:[e-mail]]
Sent: Wednesday, June 01, 2011 10:57 AM
To: Lucas, Annette
Cc: 'Walter Cole'
Subject: RE: KB Home Twin Lakes Buffer Authorization
Annette:
We have completed the Level Spreader design and updated the plans. We also had the surveyor change the contours to
1' intervals instead of 2' which caused a delay due to vacations and holidays.
I will hand deliver or mail a package out tomorrow morning with the Level Spreader Supplement, photo of the
vegetation downstream of the level spreader, a hard copy of the design plans and a hard copy of the Buffer Impact
Exhibit. Do you need a O&M Agreement for the Level Spreader?
Timothy P. Nau, PE
The Nau Company, PLLC
Mobile: [phone]
[e-mail]
From: Timothy Nau [mailto:[e-mail]]
Sent: Friday, May 13, 2011 11:13 PM
To: 'Lucas, Annette'
Subject: RE: KB Home Twin Lakes Buffer Authorization
How's this?
Timothy P. Nau, PE
The Nau Company, PLLC
Mobile: [phone]
[e-mail]
From: Lucas, Annette [mailto:[e-mail]]
Sent: Thursday, May 12, 2011 12:06 PM
To: Timothy Nau
Subject: RE: KB Home Twin Lakes Buffer Authorization
Tim -
I have to head out to a meeting soon and won't be in tomorrow. So let's just plan on discussing this on Monday after I
have a chance to look at the updated .pdfs.

Thanks,
Annette
From: Timothy Nau [mailto:[e-mail]]
Sent: Thursday, May 12, 2011 12:05 PM
To: Lucas, Annette
Cc: Chapman, Amy
Subject: RE: KB Home Twin Lakes Buffer Authorization
Yes, but I won't have it on the previous PDFs until Monday. In the interim, here is a PDF of the latest topo in the area,
perhaps this will help in the short term.
Timothy P. Nau, PE
The Nau Company, PLLC
Mobile: [phone]
[e-mail]
From: Lucas, Annette [mailto:[e-mail]]
Sent: Thursday, May 12, 2011 11:56 AM
To: Timothy Nau
Cc: Chapman, Amy
Subject: RE: KB Home Twin Lakes Buffer Authorization
Tim,
I will need to see all of the contours, particularly the ones within the adjacent riparian buffer, before I can comment on
this. Can you please send mean updated .pdf with that information?
Thanks,
Annette
From: Timothy Nau [mailto:[e-mail]]
Sent: Thursday, May 12, 2011 11:49 AM
To: Lucas, Annette
Cc: 'Walter Cole'; 'Michelle Logut'
Subject: F1N: KB Home Twin Lakes Buffer Authorization
Per our conversation, see attached greenway design and buffer encroachment. I estimated less than 0.20 acres draining
into the Swale upstream of the greenway. If something is required to diffuse flow, we would prefer a Preformed Scour
Hole (DWQ BMP Manual 8.3.7) versus a Level Spreader at the bottom Swale.
Call my mobile to discuss.
Thank you,
Timothy P. Nau, PE
The Nau Company, PLLC
Mobile: [phone]
[e-mail]

From: Walter Cole [mailto:[e-mail]]
Sent: Thursday, May 12, 2011 10:15 AM
To: Timothy Nau
Cc: Michelle Logut
Subject: FW: KB Home Twin Lakes Buffer Authorization
Tim,
Please see Annette's email below. Let me know if you have any questions.
Thanks
Walter
From: Lucas, Annette [mailto:[e-mail]]
Sent: Thursday, May 12, 2011 9:45 AM
To: Walter Cole
Cc: Chapman, Amy
Subject: RE: KB Home Twin Lakes Buffer Authorization
Walter,
I just sent my comments to Amy Chapman, who will prepare the request for more information letter. Here is the text I
sent her in case you want to get started on the response:
1. Please provide afull-size plan sheet showing the design of the proposed greenway, including one-foot
proposed topographic lines. Include on the plan sheet any swales that are being installed to drain the
greenway. If swales (or other stormwater conveyances) are being installed, then please show how
diffuse flow requirements have been met at every proposed outlet location via a level spreader or other
appropriate design per Chapter 8 of the BMP Manual.
2. Please provide one Level Spreader Supplement Form for each proposed level spreader, available at:
http://portal.ncdenr.or web/wq/ws/su/bmp-manual. Please include the Required Items checklist and all
items listed therein.
Let me know if you have questions.
Thanks,
Annette
Annette M. Lucas, PE
Environmental Engineer
NCDENR ~ DWQ ~ Wetlands and Stormwater Branch
1650 Mail Service Center, Raleigh, NC 27699-1650 (Mail)
512 N. Salisbury St, Raleigh, NC 27604 ~ 9~ Floor (L~u~atiuu t~, I'arc<~ls)
Phone: [phone] ~ Fax: [phone] ~ Email: ~nncxtr Lu<<a~~in~~~lrtii
Website- I~t~~., l'L>c~rt~iLi~<<1~~>>i_~ir~/_~~<~h~'~~~~sg"~~~~s, lUl
~~ Before printing this email, please consider your budget and the environment.

E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to
third parties.
From: Walter Cole [mailto:[e-mail]]
Sent: Wednesday, May 11, 2011 11:13 AM
To: Lucas, Annette
Subject: KB Home Twin Lakes Buffer Authorization
Annette,
Just wanted to check with you and see where the project mentioned above was in the review process. It originally went
to Amy because it was a buffer authorization request, however when I spoke with her, she said she sent it over to you
because it involved stormwater. The project number is listed below.
Thanks for your help!
DWQ Project number 20050054 V2
Walter Cole, LSS, REHS
Environmental Scientist
ME
ENGINEERING INTEGRITY.
S&ME, Inc.
3201 Spring Forest Road
Raleigh NC 27616
Ph: 919-872-2660
Fax: [phone]
Mobile: [phone]
wcole(a,smeinc.com
www.smeinc.com
This electronic message and its attachments are forwarded to you for convenience and "for information only."
The message may represent a summary with limitations, conditions and further explanations omitted in the
interest of brevity and time constraints. The contents of this electronic message and any attachments maybe
preliminary and incomplete, subject to review and revision. If this electronic transmittal contains Findings,
Conclusions or Recommendations, S&ME, Inc. will submit afollow-up hard copy via mail or overnight
delivery for your records, and this hard copy will serve as the final record. In the event of conflict between
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protected from disclosure. The information this electronic message contains is intended solely for the use of the
one to whom it is addressed, and any other recipient should delete this electronic message and destroy all
copies. VER 4, Rev 1 -- 03 1207

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I. PROJECT INFORMATION
Project name Twin Lakes -Area #9 (Cary, NC)
Contact name Tim Nau
Phone number [phone]
Date May 26, 2011
Drainage area number
II. DESIGN INFORMATION
The purpose of the LS-VFS Buffer Rule: Diffuse Flow
Stormwater enters LS-VFS from The drainage area
Type of VFS Herbaceous stormwater setback W of I-95 (slope < 8%)
Explanation of any "Other" responses above
If Stormwater Enters the LS-VFS from the Drainage Area
Drainage area 9,670 ft2
Impervious surface area 0 ft2
Percent impervious 0.00
Rational C coefficient 0.30
Peak flow from the 1 in/hr storm 0.07 cfs
Time of concentration 5.00 min
Rainfall intensity, 10-yr storm 7.5 in/hr
Peak flow from the 10-yr storm 0.50 cfs
Design storm 10-year storm
Maximum amount of flow directed to the LS-VFS 0.5 cfs
Is a flow bypass system going to be used? N (Y or N)
Explanation of any "Other" responses above
If Stormwater Enters the LS-VFS from a BMP
Type of BMP Pick one:
Peak discharge from the BMP during the design storm cfs
Peak discharge from the BMP during the 10-year storm cfs
Maximum capacity of a 100-foot long LS-VFS 5 cfs
Peak flow directed to the LS-VFS cfs
Is a flow bypass system going to be used? (Y or N)
Explanation of any "Other" responses above
Form SW401 - LS-VFS - 29Nov2010 - Rev.8 page 1 of 3

LS-VFS Design
Forebay surface area
Depth of forebay at stormwater entry point
Depth of forebay at stormwater exit point
Feet of level lip needed per cfs
Computed minimum length of the level lip needed
Length of level lip provided
Width of VFS
Elevation at downslope base of level lip
Elevation at the end of the VFS that is farthest from the LS
Slope (from level lip to the end of the VFS)
Are any draws present in the VFS?
Is there a collector swale at the end of the VFS?
Bypass System Design (if applicable)
Is a bypass system provided?
Is there an engineered flow splitting device?
Dimensions of the channel (see diagram below):
M
B
W
y (flow depth for 10-year storm)
freeboard (during the 10-year storm)
Peak velocity in the channel during the 10-yr storm
Channel lining material
Does the bypass discharge through a wetl'and'?
Does the channel enter the stream at an angle?
Explanation of any "Other" responses above
0 sq ft
18 in
6 in
20 ft/cfs
10 ft
10 ft
50 ft
319.00 fmsl
315.50 fmsl
7.00
N (Y or N) OK
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(Y or N)
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ft
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(Y or N)
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III. REQUIRED ITEMS CHECKLIST
Form SW401 - LS-VFS - 29Nov2010 - Rev.8 page 2 of 3

EDIT Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will result in
a request for additional information. This will delay final review and approval of the project. Initial in the space provided to indicate the following
design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been met, attach
justification.
Requried Item:
1. Plans (1" - 50' or larger) of the entire site showing:
- Design at ultimate build-out,
- Off-site drainage (if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Forebay (if applicable),
- High flow bypass system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROW), and
- Boundaries of drainage easement.
Initials Page or plan sheet number and any notes:
See sheet C-1.
2. Plan details (1" = 30' or larger) for the level spreader showing:
- Forebay (if applicable),
- High flow bypass system,
- One foot topo lines between the level lip and top of stream bank,
-Proposed drainage easement, and
- Design at ultimate build-out.
Section view of the level spreader (1" = 20' or larger) showing:
See sheet C-1.
See sheet C-2.
- Underdrain system (if applicable),
- Level lip,
- Upslope channel, and
- Downslope filter fabric.
Plan details of the flow splitting device and supporting calculations (if applicable).
N/A
A construction sequence that shows how the level spreader will be protected from sediment- Sheet C-1
until the entire drainage area is stabilized.
6. If anon-engineered VFS is being used, then provide a photograph of the VFS showing that
no draws are present.
See enclosed photos.
The supporting calculations.
A copy of the signed and notarized operation and maintenance (0&M) agreement.
This form represents the calculations for this project.
See enclosed.
Form SW401 - LS-VFS - 29Nov2010 - Rev.8 page 3 of 3

. ,
Permit Number:
(to be provided by DWQ)
Drainage Area Number;
Filter Strip, Restored Riparian Buffer and Level Spreader
Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important maintenance procedures:
- Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
- Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
- Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
-- Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
maybe allowed to grow as tall as 12 inches depending on aesthetic requirements
(1VIPC,1993). Forested filter strips do not require this type of maintenance.
- Once a year, the soil will be aerated if necessary.
- Once a year, soil pH wiIl be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than I.0 inch (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that aze found shall
be repaired immediately.
BMP element: Potential roblem: How I will remediate the roblem:
T'he entire filter strip Trash/debris is present. Remove the trash/debris.
s stem
The flow sputter device The flow sputter device is Unclog the conveyance and dispose
{if applicable) clo ed. of an sediment off-site.
The flow sputter device is Make any necessary repairs or
d~S~• replace if damage is too large for
re air.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 hags 1 of 3

BMP element: Potential roblem: How I will remediate the roblem:
The Swale and the level The Swale is clogged with Remove the sediment and dispose
lip sediment. of it off-site.
The level lip is cracked, Repair or replace lip.
settled, undercut, eroded or
otherwise dama ed.
There is erosion azound the Regrade the soil to create a berm
end of the level spreader that that is higher than the level lip, and
shows stormwater has then plant a ground cover and
bypassed it, water until it is established. Provide
time and aone-time fertilizer
a lication
Trees or shrubs have begun Remove them.
to grow on the Swale or just
downslo of the level li .
The bypass channel Areas of haze soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then
reestablish ro r erosion control.
Turf reinforcement is Study the site to see if a larger
damaged or ripap is rolling bypass channel is needed (enlarge if
downhill. necessary). After this, reestablish
the erosion control material.
The filter strip Grass is too short or too long Maintain grass at a height of
if a licable . a roximateI three to six inches.
Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer a lication
Sediment is building up on Remove the sediment and
the filter strip. restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer a lication
Plants aze desiccated. Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or Determine the source of the
dy~g• problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide aone-time
fertilizer a lication
Nuisance vegetation is Remove vegetation by hand if
choking out desirable species, possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality local Regional Office, or the
outlet. 401 Oversi ht Unit at 919-733-1786.
Form SWU401-Level Spreader, Filter Scrip, Restored Riparian Buffer O&M-Rev.3 Page 2 Of 3

Permit Number:
(to be provided by DWQ)
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 responstble party.
Project name:Twin Lakes - Greenwav Area #9
BMP drainage area number:NA
Print name:Rvan Jackson
Title:President -Twin Lakes Master Association
Address:6739 Falls ofNeuse Road Ralei h NC 27615
Phone:[phone]
Si
Date:~~l1 ~
Note: The legally responsible party should not be a homeowners association unless more than 50°/a of
the Lots have been sold and a resident of the subdivision has been named the president.
I, ~~ ~~'Jt ~ ~~~'~ ~~ ~1 , a Notary Public for the State of
- G'``~~1. t!~2f'ta.., County of ~~ , do hereby certify that
V ~ ~ ~ ~ s ~ pexsonally appeared before me this ~
day of _ ~~ , ~, and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or levels reader maintenance requirements.
Witness my hand and official seal, ~~~~u~-.. d
d~: •'~rsr't'~
.,
. ~t A A 1%':.c
- q~•~
~i • •
~ +. •
•
~ •
SEAL
My commission expires f~
Form SWU401-bevel Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3
Page 3 of 3