20081832 Ver 1_More Info Received_20100517

Environmental Consultants, PA
Road • Raleigh, North Carolina 27614 • Phone: [phone] • Fax: [phone]
May 17, 2010
S&EC Project # 4011.P3
DWQ No. # 08-1832
Division of Water Quality
Attn: Ian McMillan/Annette Lucas
2321 Crabtree Boulevard
Suite 250
Raleigh, NC 27604
Re: Reply to the Division of Water Quality's January 5, 2009 and February 24, 2010 requests for
additional information
SE 40 Centre
Wake County, North Carolina
Dear Mr. McMillan and Ms. Lucas:
MAY 1
QUAUTY
This letter is in response to your letters dated January 5, 2009 and February 24, 201*iKW WATERftWftWM
requested additional information for the proposed SE 40 Centre project. The following resta
your questions/comments and is then followed by our response.
Additional Information Requested on January 5. 2009
1. Please clarify what the proposed 404/wetland impacts should be.
The SE 40 Centre proposes to permanently impact 0.0989 acres of 404 jurisdictional wetlands for
the proposed internal roadway for the development.
2. Please provide documentation that the DWQ has reviewed the stream feature proposed
for impact.
In 1999, S&EC personnel met with DWQ staff on site to review the stream features present on
the subject property for the applicability of the Neuse River Riparian Buffer Rules. Please see
attached Neuse Buffer letter (NBRRO-99-25). On August 12, 2008, S&EC personnel visited the
site with Ms. Natalie Landry (DWQ) and Mr. James Shern (USAGE) as the result of the 2008
Notice of Violation letter (NOV-2008-PC-0178). During this site visit, jurisdictional
determinations were made regarding the wetlands and streams onsite and the Neuse River
Riparian Buffer boundaries previously surveyed and staked by the site engineer. These areas
were provided by Keller Environmental in the original Preconstruction Notification (PCN)
application which was statutorily approved by the USACE.
Charlotte Office:
236 LePhillip Court, Suite C
Concord, NC 28025
Phone: [phone]
Fax: [phone]
Greensboro Office:
3817-E Lawndale Drive
Greensboro, NC 27455
Phone: [phone]
Fax: [phone]
Southeast 40 Centre
Response to DWQ
S&EC Project No. 4011.P3
May 17, 2010
3. This project must comply with Stormwater Management Plan (SMP) Requirements for
Applicants Other Than the North Carolina Department of Transportation, available at:
http •//h2o enr state nc us/ncwetlands/documents/SMPRequirements orApplicantsothertha
nNCDOT.pdf. If you would like to phase the project with the road as "Phase One, " then
please include an SMP that removes a minimum of 85 percent TSS and 30 percent TN
from the stormwater generated by the road.
Please see the attached Downstream Channel, Level Spreader, and Conceptual Stormwater Pan
Calculations for Southeast 40 Centre narrative prepared by Bass, Nixon & Kennedy, Inc.
Attached are updated `DWQ Submittal' full size plan sheets revised 5/17/2010 depicting pre and
post construction drainage, a BMP concept plan and level spreader details.
Additionally, it is important to note that the City of Raleigh is a certified jurisdiction for
stormwater management plan review. A copy of the Grading & Drainage Plan, 5/02/2007,
including approved City of Raleigh SMP signed by the City in 2008 is attached. This plan was
reviewed and found to be acceptable by Annette Lucas during our meeting on April 19, 2010 and
a PDF copy was emailed to Ms. Lucas later that day.
4. For the remainder of the project, please provide a conceptual stormwater management
plan for the project that includes the following.-
a. A depiction of the drainage areas on the site.
b. An estimation of the percentage imperviousness associated with each of the
drainage areas.
c. A preliminary calculation of the water quality volume associated with each
drainage area.
d. A depiction of the proposed BMPs (state the type of BMPs you plan to use) on the
site plan that is correctly sized based on the water quality volume.
Please refer to the attached documents referenced in No. 3 above.
Additional Information Requested on February 24, 2010
The document "Downstream Channel Calculations for Southeast 40 Centre, 'dated July
17, 2009, and submitted by your consultant, Bass, Nixon, Kennedy, Inc. shows that the
flows are being discharged to the ephemeral channels at an erosive velocity. Therefore,
the current configuration of the stormwater outfalls is not be considered by the DWQ to
meet the criteria for "Existing drainage ditches, roadside ditches and stormwater
outfalls " in Item (6) of the Neuse Riparian Buffer Rule (15A NCAC 2B . 0233).
Please refer to the attached Downstream Channel, Level Spreader, and Conceptual Stormwater
Pan Calculations for Southeast 40 Centre narrative prepared by Bass, Nixon & Kennedy, Inc.
2. The riparian buffers are too steep to allow for diffuse flow in these locations. Please
provide a BMP or series ofBMPs that removal a minimum of 85 percent TSS and 30
percent TNfrom the stormwater discharged from the roadways. For each proposed
BMP, please provide a completed BMP Supplement Form, with all the required items.
The BMP Supplement Forms are available at:
http:// portal.ncdenr.org/web/wq/ws/su/bmp-manual. Please include both the Design
Summary and the Required Items Checklist along with all the required items listed
therein.
Page 2 of 3
Southeast 40 Centre
Response to DWQ
S&EC Project No. 4011.P3
May 17, 2010
As agreed to with DWQ in our meeting on April 19, 2010, APMW will redesign the stormwater
management system on the property to achieve pre-development velocity at the existing
stormwater outlet to an ephemeral stream. TN, including that contained in stormwater discharged
from the roadways, will be managed in accordance with the stormwater management plan
approved by the City of Raleigh, as illustrated in the enclosed conceptual plan.
Please refer to the attached Downstream Channel, Level Spreader, and Conceptual Stormwater
Pan Calculations for Southeast 40 Centre narrative prepared by Bass, Nixon & Kennedy, Inc.
Also, please see attached updated `DWQ Submittal' full size plan sheets revised 5/17/2010
depicting pre and post construction drainage, a BMP concept plan and level spreader details.
3. Please provide a conceptual stormwater management plan for the project that includes
the following:
a. A depiction of the drainage areas on the site.
b. An estimation of the percentage imperviousness associated with each of the
drainage areas.
c. A preliminary calculation of the water quality volume associated with each
drainage area.
d. A depiction of the proposed BMPs (state the type of BMPs you plan to use) on the
site plan that is correctly sized based on the water quality volume.
Please refer to the documents attached documents referenced in Nos. 1 and 2 above.
Please feel free to call me if you require any further explanation.
Sincerely,
SOIL & ENVIRONMENTAL CONSULTANTS, PA
Bob Zarzecki
Wetlands & Permitting Division Manager
Attachments: 5 copies of Response letter
5 copies of DWQ Request For More Information Letters (dated January 5, 2009 and February 24, 2010)
5 copies of DWQ Neuse River Buffer letter (NBRRO-99-25)
5 copies of Level Spreader DWQ Supplement Forms & Signed O&M Agreement
5 copies of Grading & Drainage Plan, 5/02/2007, including approved City of Raleigh SMP signed 2008
5 copies of Downstream Channel, Level Spreader, and Conceptual Stormwater Plan Calculations narrative
5 copies of related drawings (11X17)
5 copies of updated `DWQ Submittal' full size plan sheets revised 5/17/2010 (24X36)
Page 3 of 3
O?pF W AT -9QG Michael F. Easley, Governor
William G. Ross Jr., Secretary
r North Carolina Department of Environment and Natural Resources
>
O `C Coleen H. Sullins, Director
Division of Water Quality
January 5, 2009
DWQ Project # 08-1832
Wake County
CERTIFIED MAIL: RETURN RECEIPT REQUESTED
T. Allen Pipkin
11030 Raven Ridge Road, Suite 109
Raleigh, NC 27614
Subject Property: SE 40 Centre
Poplar Branch [030402,27-34-11-1, C, NSW]
REQUEST FOR MORE INFORMATION
Dear Sir or Madam:
On December 16, 2008, the Division of Water Quality (DWQ) received your application dated December
12, 2008, to fill or otherwise impact 4,312 acres of 404/wetland, 170 linear feet of reportedly ephemeral
stream, and 0.00 square feet of Zone 1 Neuse River basin protected riparian buffers and 0.00 square feet
of Zone 2 Neuse River basin protected riparian buffers to construct the proposed residential/commercial
project at the site. 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:
1. Please clarify what the proposed 404/wetland impacts should be.
2. Please provide documentation that the DWQ has reviewed the stream feature proposed for impact.
3. This project must comply with Stormwater Management Plan. (SMP) Requirements for Applicants
Other Than the North Carolina Department of Transportation, available at:
http://h2o.enr.state.nc.us/ncwetlands/documents/SMPRequirementsforApplicantsotherthanNCDOT p
ff. If you would like to phase the project with the road as "Phase One," then please include an SMP
that removes a minimum of 85 percent TSS and 30 percent TN from the stormwater generated by the
road.
4. For the remainder of the project, please provide a conceptual stormwater management plan for the
project that includes the following:
a. A depiction of the drainage areas on the site.
b. An estimation of the percentage imperviousness associated with each of the drainage
areas.
c. A preliminary calculation of the water quality volume associated with each drainage area.
401 Oversight/Express Review Permitting Unit
1650 Mail Service Center, Raleigh, North Carolina 27699-1650
2321 Crabtree Boulevard, Suite 250, Raleigh, North Carolina 27604
Phone: [phone] / FAX [phone] / Internet: htti):/Ai2o.enr.state.Lic.us/ncwetlands
N?pl?` ,Carolina
AalurAlly
An Equal Opportunity/Affirmative Action Employer - 50% Recycled/10% Post Consumer Paper
T. Allen Pipkin
Page 2 of 2
January 5, 2009
d. A depiction of the proposed BMPs (state the type of BMPs you plan to use) on the site
plan that is correctly sized based on the water quality volume.
Please submit this information within 30 calendar days of the date of this letter. If we do not receive this
requested information within 30 calendar days of the date of this letter, your project will be withdrawn
and you will need to reapply with a new application and a new fee.
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 McMll n at 919-733-
1786 if you have any questions regarding or would like to set up a meeting to discypsgis matter.
Cyndi Karoly, Supervisor
401 Oversight/Express Review Permitting Unit
CBK/ym
cc: Lauren Witherspoon, DWQ Raleigh Regional Office
USACE Raleigh Regulatory Field Office
File Copy
Matt Matthews, DWQ Wetlands and Stormwater Branch Manager
Jay Keller, Keller Environmental, 7921 Haymarket Lane, Raleigh, NC 27615
Filename: 081832_SEOCentre(wake)On_Hold
IVA
A
MUM
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins Dee Freeman
Governor Director Secretary
February 24, 2010
CERTIFIED MAIL: RETURN RECEIPT REQUESTED
T. Allen Pipkin
11030 Raven Ridge Road, Suite 109
Raleigh, NC 27614
Subject Property: SE 40 Centre
Poplar Branch [030402, 27-34-11-1, C, NSW]
REQUEST FOR MORE INFORMATION
Dear Mr. Pipkin:
DWQ Project # 08-1832
Wake County
On December 16, 2008, the Division of Water Quality (DWQ) received your application dated December 12,
2008, to fill or otherwise impact 4,312 acres of 404/wetland, 170 linear feet of reportedly ephemeral stream, and
0.00 square feet of Zone 1 Neuse River basin protected riparian buffers and 0.00 square feet of Zone 2 Neuse
River basin protected riparian buffers to construct the proposed residential/commercial project at the site. On
January 12, 2010, the DWQ returned your project to you, however, based on discussions with your attorney,
Steve Levitas, the DWQ has agreed to reinstate your project and requests the following information as
discussed below. The DWQ will require this 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:
1. The document "Downstream Channel Calculations for Southeast 40 Centre,' dated July 17, 2009, and
submitted by your consultant, Bass, Nixon, Kennedy, Inc. shows that the flows are being discharged to
the ephemeral channels at an erosive velocity. Therefore, the current configuration of the stormwater
outfalls is not be considered by the DWQ to meet the criteria for "Existing drainage ditches, roadside
ditches and stormwater outfalls" in Item (6) of the Neuse Riparian Buffer Rule (I 5A NCAC 2B .0233).
The riparian buffers are too steep to allow for diffuse flow in these locations. Please provide a BMP or
series of BMPs that removal a minimum of 85 percent TSS and 30 percent TN from the stormwater
discharged from the roadways. For each proposed BMP, please provide a completed BMP Supplement
Form, with all the required items. The BMP Supplement Forms are available at:
http://Portal.ncdenr.org/web/wg/ws/su/bmp-manual. Please include both the Design Summary and the
Required Items Checklist along with all the required items listed therein.
401 Oversight/Express Review Permitting Unit
1650 Mail Service Center, Raleigh, North Carolina 27699-1650
Location: 2321 Crabtree Blvd., Raleigh, North Carolina 27604
Phone: [phone] \ FAX: [phone]
Internet: http:l/h2o.enr.state.nc.us/ncwetlands/
NorthCarolina
Naturally
An Equal Opportunity \ Affirmative Action Employer
T. Allen Pipkin
Page 2 of 2
February 24, 2010
Please provide a conceptual stormwater management plan for the project that includes the following:
a. A depiction of the drainage areas on the site.
b. An estimation of the percentage imperviousness associated with each of the drainage areas.
c. A preliminary calculation of the water quality volume associated with each drainage area.
d. A depiction of the proposed BMPs (state the type of BMPs you plan to use) on the site plan that
is correctly sized based on the water quality volume.
Please submit this information within 30 calendar days of the date of this letter. If we do not receive this
requested information within 30 calendar days of the date of this letter, your project will be withdrawn and you
will need to reapply with a new application and a new fee.
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 to set up a meeting to discuss this matter.
Sincerely,
C ov
01 1
Cyndi Karoly, Supervisor
401 Oversight/Express Review Permitting Unit
CBK/ijm
cc: Lauren Witherspoon, DWQ Raleigh Regional Office
USACE Raleigh Regulatory Field Office
File Copy
Jay Keller, Keller Environmental, 7921 Haymarket Lane, Raleigh, NC 27615
Filename: 08 l 832_S E40Centre(Wake)On_Hold2

ON/
W
Steve Roberts
Soil &. Environmental Consultants
244 West Mallbrook Road
Raleigh NC, 27609
Deaf Mr. Roberts:
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
RALEIGH RxaioNAL Orrics
February 15, 19.99 , .
t
i ..t r_
Subject: Neuse River Basin Riparian Rules
Eagle Crest
Jones Sausage Road
NBRRO-99-25
Wake County
I met with you at a proposed development located. on Jones Sausage Road in Wake
County. At your request, an evaluation was performed to determine whether four (4)
features as indicated by a blue high lighter on the attached map would require
compliance with the Neuse River Buffer requirements, (Please note: these are the only
features that I reviewed). Feature # 1, 2, 3 and 4, as indicated on the attached map, are
streams and are subject to the Riparian. Buffer Rule.
In addition, in accordance with the rule, concentrated runoff from new ditches or
manmade conveyances must be dispersed into sheet flow before the runoff enters Zone
2 of the riparian area.
If you have any questions please call this office at [phone].
5' erely,
Danny With
Environmental Specialist
h:%aeuEbuflteaglecrest.
cc: RRD - file copy
;John Dorney- Wetlands/401 Group
3000 6ARRETT DRIVC, OUITIt lot, RALF16K. MORIN CAROLINA 17400
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STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely filled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)!
I. PROJECT INFORMATION
Project name Southeast 40 Centre
Contact name Travis Crissman
Phone number 919-851-4422
Date May 17, 2010
Drainage area number
IL DESIGN INFORMATION
For Level Spreaders Receiving Flow From a BMP
Type of BMP Level Spreader and Filter Strip
Drawdown flow from the BMP 0.00 cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area
Impervious surface area
Percent impervious
Rational C coefficient
Peak flow from the 1 in/hr storm
Time of concentration
Rainfall intensity, 10-yr storm
Peak flow from the 10-yr storm
Where Does the Level Spreader Discharge?
To a grassed bioretention cell?
To a mulched bioretention cell?
To a wetland?
To a filter strip or riparian buffer?
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
(Y or N)
(Y or N)
(Y or N)
Y (Y or N) Please complete filter strip characterization below.
Width of grass 50.00 ft
Width of dense ground cover 0.00 ft
Width of wooded vegetation 0.00 ft
Total width 50.00 ft
Elevation at downslope base of level lip 251.16 fmsl
Elevation at top of bank of the receiving water 247.66 fmsl
Slope (from level lip to to top of bank) 7.00 %
Are any draws present? N (Y or N) OK
Level Spreader Design
Forebay surface area 186.00 sq ft OK
Feet of level lip needed per cis 13 ft/cfs
Answer "Y' to one of the following:
Length based on the 1 in/hr storm? Y (Y or N)
Length based on the 10-yr storm? N (Y or N)
Length based on the BMP discharge rate? N (Y or N)
Design flow 3.65 cfs
Is a bypass device provided? Y (Y or N) OK
481,512.24 ft2
97,047.00 ft2
20.15 %
u.ss
3.65 cfs
5.00 min
7.22 in/hr
26.34 cfs
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Parts I. and II. Design Summary, page 1 of 2
Length of the level lip
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
y
Peak velocity in the channel during the 10-yr storm
Channel lining material
50.00 ft Level spreader length OK.
N (Y or N)
N (Y or N)
N/A (Y or N)
1.00 ft
10.00+/- ft
1.50 ft
4.95 cfs
Rip rap: 60=12"
? W
iT n
t ? Y -----------?
M M

Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Parts I. and II. Design Summary, page 2 of 2
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
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC,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 will 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 1.0 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 are found shall
be repaired immediately.
BMP element: Potential problem: How I will rernediate the problem:
The entire filter strip Trash/debris is present. Remove the trash/debris.
system
The flow splitter device The flow splitter device is Unclog the conveyance and dispose
(if applicable) clog ed. of an sediment off-site.
The flow splitter device is Make any necessary repairs or
damaged. replace if damage is too large for
repair.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 1 of 4
BMP element: Potential problem: How I will remediate the problem:
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 damaged.
There is erosion around 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 water
bypassed it. until it is established. Provide lime
and a one-time fertilizer application.
Trees or shrubs have begun Remove them.
to grow on the swale or just
downslo e of the level lip.
The bypass channel Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then
reestablish proper 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 applicable). approximately 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 application.
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 application.
Plants are desiccated. Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application.
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 Oversight Unit at 919-733-1786.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 2 of 4
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 responsible party.
Project name: Southeast 40 Centre
BMP drainage area number: l (Level Spreader Drainage Area)
Print name:Allen Pipkin / APMW, LLC
Title:Managina Member
Address: 1103 0 Raven Ridge Rd, Ste 109, Raleigh, NC 27614
Phone
Signat
Date: 0
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, 4
P
? c i c? ?,.cS ? , a Notary Public for the State of
O v KD_, County of 1 •,?cn , do hereby certify that
^? i fl k h personally -appeared before me this
day of c? 2.0 ? 0, and acknowledge the due
execution of the forgoing filter strip, riparian buffer, and/or level spreader maintenance
requirements. Witness my hand and official seal,
A, 8 4,
?O T'A
r
91t? . ?VB
COUNT

SEAL
My commission expires
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 4 of 4
BASS, NIXON & KENNEDY, INC., CONSULTING ENGINEERS
6310 CHAPEL HILL ROAD, SUITE 250, RALEIGH, NC 27607
919/851-4422 ¦ FAX [phone]
DOWNSTREAM CHANNEL, LEVEL SPREADER, AND CONCEPTUAL
STORMWATER PLAN CALCULATIONS
FOR
SOUTHEAST 40 CENTRE
RALEIGH, NORTH CAROLINA
DEVELOPED BY:
APMW, LLC
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May 2010
BASS, NIXON & KENNEDY, INC., CONSULTING ENGINEERS
6310 CHAPEL HILL ROAD, SUITE 250, RALEIGH, NC 27607
919/851-4422 ¦ FAX [phone]
CALCULATION NARRATIVE
FOR
SOUTHEAST 40 CENTRE
RALEIGH, NORTH CAROLINA
1. BACKGROUND AND PURPOSE
The purpose of this report is to outline the calculations which were performed by Bass,
Nixon & Kennedy, Inc. at the project known as Southeast 40 Centre in Raleigh, NC.
These calculations are being performed at the request of NC DWQ as part of the
resolution of a Notice of Violation (NOV - DWQ Project 08-1832) which was issued for
the project.
The calculations for this resolution consist of 3 parts:
• Channel velocity calculations (pre-developed and post-developed)
• Level spreader design calculations
• Conceptual per lot stormwater plan calculations (bioretention areas)
The above calculations will have accompanying illustrations and drawings.
2. CHANNEL VELOCITY CALCULATIONS
The stormdrainage conveyance system for project collects stormwater from
approximately 23 acres of drainage area, which includes all street drainage and a large
portion of the lot drainage. Approximately 3.93 acres of impervious surface is included
in the 23 acres of drainage (17.1% Impervious). The 23 acres of drainage which are
collected into the stormwater conveyance system are discharged at a single discharge
point shown as Structure 1 on the approved plans. The discharge point includes an
energy dissipater consisting of Class B rip-rap extending from the pipe termination to
the start of the Neuse River Buffer.
Previous calculations performed by Bass, Nixon & Kennedy, Inc. reflected as-built 2-
year velocities in the receiving stream which exceeded levels acceptable to the NC
Division of Water Quality. The purpose of the channel calculations included herein is to
demonstrate that by rearranging and redirecting drainage areas within the development,
velocities in the receiving stream mentioned above can be reduced to approximately
pre-developed levels.
There are numerous changes that will be required to the approved and constructed plan
in order to accomplish the redirection of flow. The changes required will include
1 of 4 5/12/2010
additional piping, stormdrainage inlets, and grading for ditches and are shown on the
plans referenced below.
The following illustrations and attachments are included as part of this calculation:
• DRAWING Q1.0 - Pre-developed drainage area
• DRAWING Q1.1 - Current drainage area
• DRAWING Q1.2 - Drainage areas after modification (including site changes to
redirect flow)
• FIGURE 1 - Location of channel section measurement used in calculation
• Receiving channel 2-Year velocity calculations after drainage area modification
2.1. Methodology
Data was collected about the receiving channel, including channel section and
channel/floodplain lining and roughness coefficients. The data was used to
determine the velocity and depth of flow in the channel based on Manning's formula
for open channel flow. A more detailed breakdown of the channel section and
Roughness coefficients is provided in the attached calculations.
Flow quantity calculations were calculated based on the Rational Method. The time
of concentration was taken from stormdrainage conveyance system calculations
which were performed as part of the original plan set generation.
2.2. Rational "C" Value Calculation
As part of the Stormwater Management Plan approved by the City of Raleigh, no
stormwater quantity attenuation was required for the lots which were created by this
subdivision; however, each lot is required by the City to reduce its nitrogen export to
levels acceptable under City code by limiting the amount of impervious surface,
buydown, stormwater quality treatment, or any combination of the three. Nitrogen
export calculations for each lot must include the lot itself and also must account for
areas within the public right of way (including impervious surface) along the lot's
frontage up to the centerline of that road.
Despite the fact that no quantity attenuation is required for these lots, a significant
amount of small storm (2-Year) quantity attenuation benefit will likely be provided by
the quality treatment measures which may, depending on the nitrogen export
calculations, be proposed on each lot (wet ponds, bioretention areas, constructed
wetlands, etc). It is therefore assumed that since the channel velocity and normal
depth calculations are for the 2-Year storm events, most lots will passively attenuate
their post-developed flows to pre-developed levels through the quality measures
they may be providing. Furthermore, the owner will require the developer of lots
which drain to the existing discharge point 1 (after modifications) to attenuate their
postdeveloped flows to predeveloped levels for the 2-Year event (Lots 2, 3, 4, 14,
16, and 17), in order to contribute to the flow reduction to the discharge point. This
would be accomplished by using the nitrogen reduction BMP selected for each lot
(as part of the City's approved Stormwater Management Plan) to also control
quantity and would be provided at time of lot development. On this basis, the
2 of 4 5/12/2010
Rational "C" values were calculated based on the drainage area being comprised of
the already constructed street infrastructure and the undeveloped lots.
3. LEVEL SPREADER CALCULATIONS
The flows which are redirected away from the single discharge point will be discharged
onto lot 9, which was previously lots 9-11 on the approved subdivision plan. These lots
were recombined into a single lot for an end user. Because this lot contains a buffered
stream and there is no ephemeral stream between the beginning of the buffered stream
and the buffer start, the flow will be diffused by using a level spreader located at the end
of the discharge pipe. The level spreader will be designed in accordance with the latest
requirements of the NCDWQ Best Management Practices Manual (Chapter 8, 09-28-07
version).
The following illustrations and attachments are included as part of this calculation:
• DRAWING Q1.2 - Drainage areas after modification (shows drainage area to
level spreader)
• DRAWING D1.0 - Level spreader details
• Level spreader calculations
4. CONCEPTUAL PER LOT STORMWATER PLAN
As part of the resolution to the NOV associated with this project, NC DWQ has
requested that the owner provide a conceptual stormwater plan showing a feasible type,
size, and location of BMP's for each of the lots in the development. NCDWQ staff has
confirmed that this is a conceptual plan and is not binding on the owner or end users
with respect to type, size, or location of any BMPs which are required as part of the City
of Raleigh's approved stormwater management plan.
The stormwater management strategy and plan for this site was approved under the
City of Raleigh's delegated program. The approved strategy requires each lot to meet
the City's nitrogen export requirements. Each lot must account for impervious surfaces
to the centerline of all streets on which they front such that all impervious surface added
as part of the development (including public street and sidewalk) will be accounted for in
nutrient export calculations. NCDWQ has agreed to accept the City of Raleigh
approved stormwater management strategy and also to accept City's review and
approval of each individual lot as lots are developed.
The following illustrations and attachments are included as part of this calculation:
• DRAWING CON1 - Conceptual plan showing bioretention areas on undeveloped
lots (bioretention areas are shown in concept only. Final type, size, and location
of BMPs required by the City's approved stormwater management plan may
vary).
• Bioretention area calculations (assuming 85% impervious surface per lot with
entire lot draining to bioretention area and 12" ponding depth).
5. PERMITTING OF PLAN CHANGES
3 of 4 5/12/2010
After a plan to resolve the NOV is approved by NC DWQ, the changes shown will
require approval by the City of Raleigh as a revision to previously approved construction
drawings and grading permit or may require new construction drawings and grading
permit for this work only. Upon NC DWQ approval of this plan, the owner will need to
submit plans to the City of Raleigh for approval prior to constructing the approved
changes. It is somewhat uncertain as to the timeframe with which these City approvals
can be obtained, but it is typical for the approval processes to take 6-8+ weeks.
4 of 4 5/12/2010
CHANNEL- VELOCITY
(;AL,CULATIR-NSl,l
FIGURE 1
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BASS, NIXON & KENNEDY, INC. SOUTHEAST 40 CENTRE
CONSULTING ENGINEERS CHANNEL SECTION
• 6310 CHAPEL HILL ROAD, STE 250, RALEIGH, NORTH CAROLINA 27607
• 3319 HERITAGE TRADE DR, WAKE FOREST, NORTH CAROLINA 27587
TELEPHONE: [phone] or [phone] JOB NO. DRAWN BY DATE SHEET OF
FAX: [phone] (RALEIGH), [phone] (WAKE FOREST) 06839000 JTC 5-12-10 1 1
I
y
Pre-Developed Channel Flow Calculation:
Rational Method Flow Calculation:
Q = CIA
Drainage Area: 11.302 acres
Rational Coefficient (C): 0.2
Time of Concentration: 5 min
Storm Event: 2 yr
Rainfall Intensity (1): 5.76 in/hr
Flow (Q): 13.02 cfs
Manning's Channel Depth of Flow:
Channel Manning's n: 0.046
Longitudinal Slope: 0.0055 ft/ft
Base Width: 1.75 ft
Sideslope: 0.44 :1
Depth of Flow: 2.16 ft
Flow: 13.02 cfs
Velocity:
2.24 fps
Channel Section:
Station Elevation
46.71 235.66
48.28 232.06
50.03 232.11
52.13 236.83
Kirpich Time of Concentration Calculation
Length of Flow: 1126 ft
Highest Point on Length of Flow: 298.5 ft EL.
Lowest Point on Length of Flow: 240 ft EL.
Change in Height: 58.5 ft
Time of Concentration: 5.5 min
Channel Section:
238
237 -

239 52.1
236. 3,
83
6.71,

235
-- 35.66
234
233

232 50.0 ,

231 232.06
46 47 49 49 50 51 52 53
Station
Post-Developed Channel Flow Calculation:
Rational Method Flow Calculation:
Q = CIA
Drainage Area: 11.966 acres
Rational Coefficient (C): 0.2
Time of Concentration: 6 min
Storm Event: 2 yr
Rainfall Intensity (1): 5.56 in/hr
Flow (Q): 13.31 cfs
Manning's Channel Depth of Flow:
Channel Manning's n : 0.046
Longitudinal Slope: 0.0055 ft/ft
Base Width: 1.75 ft
Sideslope: 0.44 :1
Depth of Flow: 2.19 ft
Flow: 13.31 cfs
Velocity: 2.25 fps
Channel Section:
Station Elevation
46.71 235.66
48.28 232.06
50.03 232.11
52.13 236.83
Kirpich Time of Concentration Calculation
Length of Flow: 1246 ft
Highest Point on Length of Flow: 302 ft EL.
Lowest Point on Length of Flow: 240 ft EL.
Change in Height: 62 ft
Time of Concentration: 6.0 min
Channel Section:

236
-
237 52.
236.8 3
3'
236
6.71,
% 35.66
235
234
233
50.0 ,
232 4-8-28

231 232.06
46 47 46 49 50 51 52 53
Statio.
LEvEL, SPREADER
DESIGN CALCULATIONS
Level Spreader Calculations
Project Name: Southeast 40 Centre
Flow Contributing to Level Spreader:
Rational "C" Value 0.33
Intensity 1 in/hr
Total Area 11.05 ac
Rational Equation: Q=C*I*A
Required Flow Treatment 3.65 cfs
Downstream Conditions:
Type of Downstream Ground Cover % of Cover Length Req L x %
Grass 100 47 4742
N/A 0 0 0
TOTAL 100 4742
Length based on Weighted Avg 47
CONCEPTUAL STORMWVATER
CALCULTIONS PER. LOT
Conceptual Bioretention Calculations
Project Name: Southeast 40 Centre
Design Criteria: 2007 DWQ BMP Manual (Updated)
Lot Number: 1
'Step 1: Determine Drainage Area and Impervious.Surface
Drainage Area: 2.01 ac Assumes Entire Lot as D.A.
Impervious Area: 1.71 ac 85% of Lot Area
Drainage Area Percent Impervious: 85%
Step 2: Determine the Volume of Water to Treat
Rainfall to Treat: (First Flush)
1 in
Runoff Coefficient (Rv) = 0.05 + 0.009*(% Impervious)
Runoff Coefficient (Rv): 0.82 in/in
Runoff Volume (WQV) = Rainfall * (Rv) * (Drainage Area)
Runoff Volume (WQV): 5,955 cf
Step 3: Determine the Surface Area and Depth Required
Ponding Depth:
Required Surface Area:
12.00 in = 1.00 ft
5,955 sf
R:\2006jobs\06839000\NOV Stuff\Bioretention for Concept Plan.xis
Conceptual Bioretention Calculations
Project Name: Southeast 40 Centre
Design Criteria: 2007 DWQ BMP Manual (Updated)
Lot Number: 2
Step 1: Determine Drainage Area and Impervious Surface
Drainage Area: 1.63 ac Assumes Entire Lot as D.A.
Impervious Area: 1.39 ac 85% of Lot Area
Drainage Area Percent Impervious: 85%
Step 2:' Determine the Volume of Water to Treat
Rainfall to Treat: (First Flush) 1 in
Runoff Coefficient (Rv) = 0.05 + 0.009*(% Impervious)
Runoff Coefficient (Rv): 0.82 in/in
Runoff Volume (WQV) = Rainfall * (Rv) * (Drainage Area)
Runoff Volume (WQV): 4,836 cf
[-Step 3 Determine the Surface Area and Depth Required
Ponding Depth: 12.00 in = 1.00 ft
Required Surface Area: 4,836 sf
R:\2006jobs\06839000\NOV Stuff\Bioretention for Concept PlanAs
Conceptual Bioretention Calculations
Project Name: Southeast 40 Centre
Design Criteria: 2007 DWQ BMP Manual (Updated)
Lot Number: 3
Step 1: Determine Drainage Area and Impervious Surface
Drainage Area: 1.74 ac Assumes Entire Lot as D.A.
Impervious Area: 1.48 ac 85% of Lot Area
Drainage Area Percent Impervious: 85%
Step 2: Determine the Volume of Water to Treat
Rainfall to Treat: (First Flush) 1 in
Runoff Coefficient (Rv) = 0.05 + 0.009*(% Impervious)
Runoff Coefficient (Rv): 0.82 in/in
Runoff Volume (WQV) = Rainfall * (Rv) * (Drainage Area)
Runoff Volume (WQV): 5,134 cf
'Step 3: Determine the Surface Area and Depth Required j
Ponding Depth: 12.00 in = 1.00 ft
Required Surface Area: 5,134 sf
RA2006jobs\06839000\NOV StufflBioretention for Concept Plan.xls
Conceptual Bioretention Calculations
Project Name: Southeast 40 Centre
Design Criteria: 2007 DWQ BMP Manual (Updated)
Lot Number: 4
Step 1: Determine Drainage Area and Impervious Surface
Drainage Area: 1.36 ac Assumes Entire Lot as D.A.
Impervious Area: 1.16 ac 85% of Lot Area
Drainage Area Percent Impervious: 85%
Step 2: Determine the Volume of Water to Treat
Rainfall to Treat: (First Flush) 1 in
Runoff Coefficient (Rv) = 0.05 + 0.009*(% Impervious)
Runoff Coefficient (Rv): 0.82 in/in
Runoff Volume (WQV) = Rainfall * (Rv) * (Drainage Area)
Runoff Volume (WQV): 4,021 cf
'Step 3: Determine the Surface Area and Depth Required
Ponding Depth: 12.00 in = 1.00 ft
Required Surface Area: 4,021 sf
R:\2006jobs\06839000\NOV StufflBioretention for Concept PlanAs
Conceptual Bioretention Calculations
Project Name: Southeast 40 Centre
Design Criteria: 2007 DWQ BMP Manual (Updated)
Lot Number: 5
Step 1: Determine Drainage Area and Impervious Surface -
Drainage Area: 1.01 ac Assumes Entire Lot as D.A.
Impervious Area: 0.86 ac 85% of Lot Area
Drainage Area Percent Impervious: 85%
Step 2: Determine the Volume of Water to Treat
Rainfall to Treat: (First Flush) 1 in
Runoff Coefficient (Rv) = 0.05 + 0.009*(% Impervious)
Runoff Coefficient (Rv): 0.82 in/in
Runoff Volume (WQV) = Rainfall * (Rv) * (Drainage Area)
Runoff Volume (WQV): 2,991 cf
(Step 3: Determine the Surface Area and Depth Required
Ponding Depth: 12.00 in = 1.00 ft
Required Surface Area: 2,991 sf
RA2006jobs\06839000\NOV Stuff\Bioretention for Concept Plan.xis
Conceptual Bioretention Calculations
Project Name: Southeast 40 Centre
Design Criteria: 2007 DWQ BMP Manual (Updated)
Lot Number: 6
Step 1: Determine Drainage Area and Impervious Surface
Drainage Area: 1.93 ac Assumes Entire Lot as D.A.
Impervious Area: 1.64 ac 85% of Lot Area
Drainage Area Percent Impervious: 85%
Step 2: Determine the Volume of Water to Treat
Rainfall to Treat: (First Flush)
1 in
Runoff Coefficient (Rv) = 0.05 + 0.009*(% Impervious)
Runoff Coefficient (Rv): 0.82 in/in
Runoff Volume (WQV) = Rainfall * (Rv) * (Drainage Area)
Runoff Volume (WQV): 5,707 cf
Step 3: Determine the Surface Area and Depth Required
Ponding Depth:
Required Surface Area:
12.00 in = 1.00 ft
5,707 sf
R:\2006jobs\06839000\NOV Stuff\Bioretention for Concept PlanAs
Conceptual Bioretention Calculations
Project Name: Southeast 40 Centre
Design Criteria: 2007 DWQ BMP Manual (Updated)
Lot Number: 7
Step 1: Determine Drainage Area and Impervious Surface
Drainage Area: 2.47 ac Assumes Entire Lot as D.A.
Impervious Area: 2.10 ac 85% of Lot Area
Drainage Area Percent Impervious: 85%
Step 2: Determine the Volume of Water to Treat
Rainfall to Treat: (First Flush)
1 in
Runoff Coefficient (Rv) = 0.05 + 0.009*(% Impervious)
Runoff Coefficient (Rv): 0.82 in/in
Runoff Volume (WQV) = Rainfall * (Rv) * (Drainage Area)
Runoff Volume (WQV): 7,305 cf
"Step 3: Determine the Surface Area and Depth Required
Ponding Depth:
Required Surface Area:
12.00 in = 1.00 ft
7,305 sf
RA2006jobs10683900MOV Stuff\Bioretention for Concept Plan.xls
Conceptual Bioretention Calculations
Project Name: Southeast 40 Centre
Design Criteria: 2007 DWQ BMP Manual (Updated)
Lot Number: 8
Step 1: Determine Drainage Area and Impervious Surface
Drainage Area: 2.01 ac Assumes Entire Lot as D.A.
Impervious Area: 1.71 ac 85% of Lot Area
Drainage Area Percent Impervious: 85%
i Step 2: Determine the Volume of Water to Treat
Rainfall to Treat: (First Flush) 1 in
Runoff Coefficient (Rv) = 0.05 + 0.009*(% Impervious)
Runoff Coefficient (Rv): 0.82 in/in
Runoff Volume (WQV) = Rainfall * (Rv) * (Drainage Area)
Runoff Volume (WQV): 5,957 cf
Step 3: Determine the Surface Area and Depth Required
Ponding Depth: 12.00 in = 1.00 ft
Required Surface Area: 5,957 sf
R:\2006jobs\06839000\NOV Stuff\Bioretention for Concept Plan.xls
Conceptual Bioretention Calculations
Project Name: Southeast 40 Centre
Design Criteria: 2007 DWQ BMP Manual (Updated)
Lot Number: 12
Step 1: Determine Drainage Area and Impervious: Surface
Drainage Area:
Impervious Area:
1.94 ac Assumes Entire Lot as D.A.
1.65 ac 85% of Lot Area
Drainage Area Percent Impervious: 85%
Step 2: Determine the Volume of Water to Treat
Rainfall to Treat: (First Flush)
1 in
Runoff Coefficient (Rv) = 0.05 + 0.009*(% Impervious)
Runoff Coefficient (Rv): 0.82 in/in
Runoff Volume (WQV) = Rainfall * (Rv) * (Drainage Area)
Runoff Volume (WQV): 5,742 cf
Step 3: Determine the Surface Area and Depth Required
Ponding Depth: 12.00 in = 1.00 ft
Required Surface Area: 5,742 sf
R:\2006jobs\06839000\NCV Stuff\Bioretention for Concept Plan.xls
Conceptual Bioretention Calculations
Project Name: Southeast 40 Centre
Design Criteria: 2007 DWQ BMP Manual (Updated)
Lot Number: 13
Step 1: Determine Drainage Area and Impervious Surface
Drainage Area: 1.47 ac Assumes Entire Lot as D.A.
Impervious Area: 1.25 ac 85% of Lot Area
Drainage Area Percent Impervious: 85%
Step 2: Determine the Volume of Water to Treat
Rainfall to Treat: (First Flush)
1 in
Runoff Coefficient (Rv) = 0.05 + 0.009(% Impervious)
Runoff Coefficient (Rv): 0.82 in/in
Runoff Volume (WQV) = Rainfall * (Rv) * (Drainage Area)
Runoff Volume (WQV): 4,361 cf
!Step 3: Determine the Surface Area and Depth Required
Ponding Depth:
Required Surface Area:
12.00 in = 1.00 ft
4,361 sf
RA2006jobs\06839000\NOV Stuff\Bioretention for Concept PlanAs
Conceptual Bioretention Calculations
Project Name: Southeast 40 Centre
Design Criteria: 2007 DWQ BMP Manual (Updated)
Lot Number: 14
Step .1: Determine, Drainage Area-an I d Impervious Surface
Drainage Area: 1.29 ac Assumes Entire Lot as D.A.
Impervious Area: 1.09 ac 85% of Lot Area
Drainage Area Percent Impervious: 85%
Step 2: Determine the Volume of Water to Treat
Rainfall to Treat: (First Flush) 1 in
Runoff Coefficient (Rv) = 0.05 + 0.009'(% Impervious)
Runoff Coefficient (Rv): 0.82 in/in
Runoff Volume (WQV) = Rainfall * (Rv) * (Drainage Area)
Runoff Volume (WQV): 3,807 cf
Step 3: Determine the Surface Area and Depth Required
Ponding Depth: 12.00 in = 1.00 ft
Required Surface Area: 3,807 sf
RA2006jobs\06839000\NOV Stuff\Bioretention for Concept PlanAs
Conceptual Bioretention Calculations
Project Name: Southeast 40 Centre
Design Criteria: 2007 DWQ BMP Manual (Updated)
Lot Number: 16
Step 1: Determine Drainage Area and Impervious Surface
Drainage Area: 1.40 ac Assumes Entire Lot as D.A.
Impervious Area: 1.19 ac 85% of Lot Area
Drainage Area Percent Impervious: 85%
Step 2: Determine the Volume of Water to Treat
Rainfall to Treat: (First Flush) 1 in
Runoff Coefficient (Rv) = 0.05 + 0.009*(% Impervious)
Runoff Coefficient (Rv): 0.82 in/in
Runoff Volume (WQV) = Rainfall * (Rv) * (Drainage Area)
Runoff Volume (WQV): 4,153 cf
,Step 3: Determine the Surface Area and Depth Required
Ponding Depth: 12.00 in = 1.00 ft
Required Surface Area: 4,153 sf
RA2006jobs\06839000\NOV StufflBioretention for Concept Plan.xls
Conceptual Bioretention Calculations
Project Name: Southeast 40 Centre
Design Criteria: 2007 DWQ BMP Manual (Updated)
Lot Number: 17
Step 1: Determine Drainage Area and Impervious Surface
Drainage Area:
Impervious Area:
1.28 ac Assumes Entire Lot as D.A.
1.08 ac 85% of Lot Area
Drainage Area Percent Impervious: 85%
Step 2 Determine the Volume of Water to Treat
Rainfall to Treat: (First Flush) 1 in
Runoff Coefficient (Rv) = 0.05 + 0.009*(% Impervious)
Runoff Coefficient (Rv): 0.82 in/in
Runoff Volume (WQV) = Rainfall * (Rv) * (Drainage Area)
Runoff Volume (WQV): 3,776 cf
Step 3: Determine the Surface Area and Depth Required
Ponding Depth: 12.00 in = 1.00 ft
Required Surface Area: 3,776 sf
R:\2006jobs\06839000\NOV Stuff\Bioretention for Concept Plan.xls
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RALEIGH, NC 27614
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