20070453 Ver 1_More Info Received_20070424

KELLER ENVIRONMENTAL
ENVIRONMENTAL CONSULTANTS
7921 Haymarket Larte, Raleigh, tVC
(919}844-7437
Fax [phone]
D1 - o~ S 3
LETTER OF TRANSMITTAL
DATE: April 23, 2007
TO: NC Division of Water Quality ATTENTION: Staff
RE: Panther Rock Subdivision
WE ARE SENDING YOU THE FOLLOWING:
^ Prc-constn~ction Notification (PCN) ®Plans
~ Documents ^ Other
^ Maps ^ Specifications
THESE ARE TRANSMITTED AS CI-iECKED BELOW: p ~~~a~~
® For approval ®As requested ®For revie«° & comment D
~ Flcasereply~ APR 2 4 2007
^ Sec below ® For your flies
NANO S70RMyygTE t~TM4NCH
^ ReguIar Mail ^ Fed-Er ~ Delivered b~~ KE ^ Picked Up
COPIES DATE DESCRIPTION _
_
5 4-17-07 DWQ Request for More Tnformation
~ 401 Wet Detention Worksheets _ _
_
i 4-lE)-07 Wet Detention Basin O & M Agreements
5 =1-17-07 Stormy-eater Fond Plans

Remarks:
TI~ANK YOU!
Recd By: ~~
~~~ja~~Z
Signed
,~ ,.....

KELLER ENVIRONMENTAL
ENVIRONMENTAL CONSULTANTS
7921 Haymarket Lane, Raleigh, NC
(919) 8447437
Fax [phone]
0'1 - 0~5 3
To: NC Division of Water Quality
401 Oversight and Express Permits Unit
Attn: Staff
2321 Crabtree Boulevard
Suite 250
Raleigh, North Carolina 27604-2260
Re: Panther Rock Subdivision
Knightdale, NC
April 23, 2007
On behalf of the applicant, Panther Rock, LLC, please find attached a complete application and supplemental
information requesting written concurrence from the United States Army Corps of Engineers (COE} and the North Carolina
Division of Water Quality {DWQ) that the activities proposed below may precede utilizing Nationwide Permit 39. We are
requesting to place culverts and headwafls in 1 stream and 1 subterranean sewer line in another stream for the purpose of
constructing Panther Rock Subdivision Phase 1. The proposed road crossing location will also include a sewer line. A third
aerial sewer crossing is also proposed. 61 homesites are proposed for this subdivision. These proposed impacts are
contained in the attached packet of information.
DD~1 iCC`T CI IMMdRV
Pro'ect Name PANTHER ROCK
Pro'ect T SUBDIVISION
Owner / ficant Panther Rock, LLC, do Pablo Reiter
Cou Wake
Nearest Town Kn' htdale
Waterbo Name UT to Neuse River
Basin /Sub-basin Neuse 03-04-02
Index Number 27 22.5}
Class C, N5W
IMD~(T CI IMM~RV
Stream Im act acres 0.016 acres Went ; 0.004 acres tem ra
Neuse River Buffer Impacts acres 0.29 acres rmanent
Wetland Im cts acres 0.046 em
Total Im act to Waters of the State acres 0.016 acres Went ; 0.050 acres tem ra
Total Stream Im ct linear feet 113 linear feet ermanent; 30 feet tem ora
Please contact me at [phone] (office) or [phone] (cell) or iay(c~kellerenvironmental.com if you have any
questions or require any additional information.
Sincerely,
KELLER ENVIRONMENTAL, LLC
~-~
Jay Keller
Principal
Attachments:
DW© Request for More Infarrrration 4-17-07
401 Wet Detention Worksheet
Wet Detenrtion Basin O & M Agreement
Stomiwater Pond Plan

Michael F. Easley, Governor
William G. Ross .lr., Secretary
North Carolina Department of Environment and Natural Resources
April 17, 2007
CERTIFIED MAIL: RETURN RECEIPT REQUESTED
Mr. Pablo Reiter
Panther Rock, LLC
6736 Falls of the Neuse Road, Suite 201
Raleigh, NC 27615
Subject Property: Panther Rock Subdivision
Ut to Neuse River [030402, 27-(22.5), C, NSW]
REQUEST FOR MORE INFORMATION
Dear Mr. Reiter:
Alan W. Klimek, P.E. Director
Division of Water Quality
DWQ Project # 07-0453
Wake County
On March 12, 2007, the Division of Water Quality (DWQ) received your application dated March 9,
2007, to fill or otherwise impact 0.046 acres of 404/wetland, 143 linear feet of perennial stream (113
linear feet permanent impact, 30 linear feet temporary impact), and 7,750 square feet of Zone 1 Neuse
River basin. protected riparian buffers and 5,000 square feet of Zone 2 Neuse River basin protected
riparian buffers to construct the proposed residential subdivision. On April 12, 2007, the DWQ received
additional information from you, however, the DWQ has determined that your application remains
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 prcpetty, Therefore, unless we receive five copies of the additional information requested below,
we will have to move toward denial of your application as required by 15A NCAC 2H .0506 and will
place this project on hold as incomplete until we receive this additional information. Please provide the
following information so that we may continue to review your pm,ject.
Additional Information Requested:
1. Please include plan details for the level spreader.
2. Please provide a plan view of the level spreader with topographic lines at a 1" = 50' scale or larger
to allow DWQ staff to verify that appropriate slopes are present and that the level spreader has been
placed parallel to contour lines.
3. Since the dry detention basin is part of the diffuse flow system, please provide appropriate
calculations and plans as well as a DWQ worksheet (available at:
http://h2o.enr.state.nc.us/ncwetlands/dr.~dY etwk~df_). You must provide all items listed in Part II:
Required Items Checklist.
Please contact the DWQ within three weeks of the date of this letter to verify that you have received this
letter and to provide us with a date that we may expect to receive this requested information. [f we do not
receive this requested information within one week of the date y<~u indicate it will be forthcoming, your
Nose hCarolina
401 OversighdExpress Review Permittine Unit ~atura!!If
1650 Mail Service Center, Raleigh, North Carolina 27699-1650
2321 Crabtree Boulevard, Suite 250, Raleigh, North Carolina 27604
Phone: [phone] /FAX [phone] /Internet: http://h2o.enr.state.nc.uti/ncwetlands
An Equal Opportunity/Affirmative Action F.,mployer- SO4io Recycled/10°~ Pest Consumer Papcr

Panther Rock, LLC
Page 2 of 2
April 17, 2007
project will be withdrawn and you will need to reapply with a new application and a new fee. Please
contact me in writing and Lauren Cobb of the DWQ Raleigh Regional Office. if we do not hear from you
within three weeks, we will assume that you no longer want to pursue this project and we will consider
the project as withdrawn.
This letter only addresses the application review and does not authorize any impacts to wetlands, waters
or protected buffers. Please be aware that any impacts requested within your application are not
authorized (at this time) by the DWQ. Please call Ms. Cyndi Karoly or Mr. Ian McMillan at 919-733-
1786 if you have any questions regarding or would like ro set up a meeting to discuss this matter.
Sincerer.
Cyndi Karoly, Supervisor
401 Oversight/Express Review Permitting Unit
CBKlijm
ce: Lauren Cobb, DWQ Raleigh Regional Office
USACE Raleigh Regulatory Field Office
File Copy
Central Files
Jay Keller, Keller Environmental, 7921 Haymarket Lane, Raleigh, NC 27615
Filename 070453PantherRockSD(Wake)On_Hold2

Project No. DWQ ~ 1 ' ~ ~ [J 3 (to be provided by DWQ~
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 IN O TION (please mplete the following information):
Project Name s
Contact Person: Phone Number:
For projects with multiple asins, specify which basin this worksheet applies to: .
Basin Bottom Elevafion ~~~ ~~ ft. (average elevation ofthe floor of the basin)
Permanent Pool Elevation ~,~. ~ ft. (elevation of the orifice invert out)
Temporary Pool Elevation ~~• I ft. (elevation of the outlet structure invert in)
Permanent Pool Surface Area r~,.~~ sq. ft.
Drainage Area ~ ac.
Impervious Area ac.
Permanent Pool Volume o ~ cu. ft.
Temporary Pool Volume cu. ft.
Forebay Volume ~ cu. ft.
(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)
(combined volume of main basin and forebay)
(volume detained on top of the permanent pool)
SA/DA used G.a.2 . (surface area to drainage area ratio)
Diameter of Orifice '~ in. (draw down orifice diameter):
II. REQUIRED 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.
.The temporary pool controls runoff from the 1 inch storm event.
The basin length to width ratio is greater than 3: L
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.
An emergency drain is provided to drain the basin.
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.
~ Access is provided for maintenance.
L A minimum 30-foot vegetative filter is provided at the outlet.
.G A site specific operation and maintenance (O&M) plan is provided.
A vegetation management/mowing schedule is provided in the O&M plan.
G Semi-annual inspections are specified in the O&M plan.
A debris check is specified in the O&M plan to be performed after every storm event.
A specific sediment clean-out benchmark is listed (elevation or depth) in O&M plan.
A responsible party is designated in the O&M plan.
FO SWG100 09/97 Page 1 of 1

•~-~ ~- _ 0~ - fl~S 3
WET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
The wet detention basin system is de#ined as the wet detention basin, pretreatment including forebays and the
' vegetated fil er if one is provided.
Maintenance activities shall be performed: as follows:
1. After-every significant runoff producing rainfall event and at least monthly:
a. Inspect the wet detention basin system far sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover,.. mow
vegetative coverto maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping., swales, riprap, etc.) quarterly to
maintain proper functioning.
~4. Remove accumulated sediment from the uret detention basin °system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed
of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality
(i.e. stockpiling near a wet detention basin or stream, etc.).
The measuring device. used to :determine the sediment, elevation shall be such that it will give an accurate
depth reading and not readily penetrate into accumulated sediments'.:
When the permanent pool depth reads feet in the main pond, the sediment shall be removed.
When the permanent pool depth reads feet in the forebay [and micro-pool], the sediment shall
be removed.
BASIN DIAGRAM
(fill in fhe blanks)
---~ 0 Permanent Pool Elevation ~~$,~~o ~--
,-
_.
Sediment moval E!. 2 75%
-------------- -- Sediment Removal Elevation '.ZrT 75°10
Bottom E Ovation 5fl1~ ~~~.~,
Bottom fl
FOREBAY
MAIN P+DND
5. Remove cattails and other indigenous wetland. plants when they cover 50% of the basin surface. These
plants shall be encouraged to grflw along the vegetated shelf and forebay berm.
6. If the basin must be drained for an emergency or to perform maintenance, the .flushing of sediment
through the emergency drain shall be minimized to the maximum extent practical..

~'"
7. All components of the dry detention basin system shall be maintained in good working order.
8. Level spreaders or other structures that provide diffuse flow shall. be maintained every six months. All
accumulated sediment and debris sha l be removed from the structure, and a level elevation shall be
maintained across the entire flow spreading structure. Any dGiwn gradient erosion must be repaired and/or
replanted as necessary.
I acknowledge and agree by my signature below that I am responsible for the performance of the seven
maintenance procedures lis#ed above. I agree to notify DWQ of any problems with the system or prior to any
changes to the system or responsible party.
Print Warne: ~~Af.A 2~ t ~ ,
Title: ,~~tit~~~~
~'~ ~~ -,
Address: ~'~((.S Cs~ tii`=t'S~- IJ'~~ S7- ~( ~=.fit-~t~~~r ~- Z~~~~~
Phone:
Signature.:
Date:
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 tDeen named the president.
I, .~~ ~ ~ , ~~ • ( g` ;~ , a Notary Public for the State of ~~~ C~'
County of . ~r~f°t r~ ~;-~-.t r-~ , do hereby certify that ~~ ~~ ~, Y. ~. ~"~.~.°4
personally appeared before me this ~ ~i day of ~~~,~, ~ ~,.. ; .F ~~>~' •~ ,and acknowledge the due
ecution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,
.~~~,Rt R• ~~
Comn,~~p, I
...~~~~
`~H coves
SEAL
My commission expires "~~ - ~ (~'`~^,~
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