20061154 Ver 2_More Info Received_20080211

WITHERS ~ RAYENEL
ENGINEERS I PLANNERS I SURVEYORS
111 MacKenan Drive
CARY, NORTH CAROLINA, 27511
[phone] D ~i ~ ~ a V ~ D
FAX [phone] V
FFR I ~ 2008
TO: NC DWQ
401 Wetlands Unit VbETIAtJ[~;;;NC~;7?OR~l1NATEr.ul~:`,itCH
Crabtree Blvd
Raleigh, NC
WE ARE SENDING YOU
^ Shop Drawings
^ Copy of Letter
~ Attached via
® Prints
^ Change order
LJ runs
^ Diskette
COPIES DATE NO. DESCRIPTION
2 2-11-08 1 Revised Plan Sheets
2 2-11-08 2 Calculation and Maintenance Package
1 11-28-07 3 Copy of Original Comments
1 2-11-08 4 Response to Comments

THESE ARE TRANSMITTED as checked below:
® For approval ^ Approved as submitted
^ For your use ^ Approved as noted
^ As requested ^ Returned for corrections
^ For review and comment ^
^ FOR BIDS DUE 20 ^ PRINTS RETURNED AFTER LOAN TO US
REMARKS:
COPY TO:
~ - l~~ ~~.
I~ _li_ ~~Ir ~'~_' ~ 1 _~ ~~ _~
DATE 2-11-08 loB No. 2060543.00
ATTENTION Annette Lucas
PHONE # [phone]
RE: Associate Park II
Resoonse to Comments
copies for approval
copies for distribution
corrected prints
_ the following items:
^ Samples ^ Specifications
^ Resubmit
^ Submit
^ Return
/f enclosures are not as noted, kindly notify us at once.
SIGNED: F~nter Freeman

ENGINEERS I PLANNERS E SURVEYORS
MEMORANDUM
TO: Annette Lucas - NC-DWQ
FROM: Hunter Freeman -Withers & Ravenel
DATE: 2-11-07
PROJECT: Associate Park II -DWQ Project #: 06-1154
SUBJECT: 401 Request and Buffer Compliance
In response to comments dated November 28, 2007, we offer the following comments.
1. Level Spreader 2
a. A dry pond has been added upstream of the level spreader to reduce the overall
length of the system. A bypass riser is included to bypass larger storm events.
b. Dry pond added as noted above.
c. Bypass ditch has been added, calculations for lining are included in the submittal
information.
2. The typical level spreader detail is on sheet 17 as noted on the revised worksheet. The
previous reference to sheet 9 was incorrect.
3. See below
a. Signed agreements are attached
b. Complete level spreader and pond calculations attached
c. A draft deed restriction is attached.
If you have any further comments, please do not hesitate to contact me at the number below.
111 MacKenan Drive ~ Cary, North Carolina 27511 I tel:[phone] ~ fax:[phone] I www.withersravenel.com
704o Wrightsville Ave I Suite 101 Wilmington, North Carolina 28403 ~ tel: 91o.z56.9z77 I fax: [phone]
1027 Sabbath Home Rd., SW I Supply, NC 28462 (tel: [phone] I fax: [phone]

`o~CF w ~ rF9pG
~ I l ~1. r
>_ l V_wv~ =1
o `\.~li ~
.wT~ . vLuvv r ~~
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Coleen H. Sullins, Director
Division of Water Quality
November 28, 2007
DWQ Project # 06-1 lrVe~r.ty2
W ake'F~'' ! j
CERTIFIED MAIL: RETURN RECEIPT REQUESTED ~t/j OFCOS~ ~~
~rs~ ~~~%
Mr. Johnny Blankenship ~d
ABM Associates, LLC ~
2204-F Associates Drive A~~`
Raleigh, NC 27603
Subject Property: Associates Park II
Mills Branch [030403, 27-43-IS-7, C, NSW]
REQUEST FOR MORE INFORMATION
Dear Mr. Blankenship:
On October 17, 2007, the Division of Water Quality (DWQ) received. your application dated October 17,
2007, to fill or otherwise impact 46 feet of perennial stream and 3,110 square feet of Zone 1 Neuse River
basin protected riparian buffers and 2,304 square feet of Zone 2 Neuse River.-basin protected riparian
buffers to construct the proposed office/business park. 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 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 project.
Additional Information Requested:
There aze a number of issues associated with the design of the level spreaders serving drainage
area 2:
a. The DWQ recommends revising the currently proposed design such that flow from the
drainage area is first routed to a dry detention basin and then to one level spreader. This
design would reduce the length of level spreader required to diffuse the flow and would
also eliminate the need for the scour hole and the two forebays proposed in the current
design.
b. If the applicant chooses to .retain the current proposal with two separate level spreaders,
additional details and calculations regarding the flow splitting device must be provided
for the DWQ to insure that it will operate correctly (i.e., provide the correct flows from
the one inch/hour storm to each of the two level spreaders).
c. Regazdless of the design the applicant chooses, a properly designed bypass device must
be provided. .
401 OversightBxpress Review Permitting Unit
1650 Mail Service Center, Raleigh North Carolina 27699-1650
2321 Crabtree Boulevard, Suite 250, Raleigh, North Carolina 27604
Phone: [phone]b /FAX [phone] / Internet: htt~//h2o.enr.state.nc.us/ncwetlands
An Equal Opportunity/Affirmative Action Employer - 50% Recycled/10% Post Consumer Paper
N ~ Carolina
((~~ tlllYlQl~
D ~~L~~~~
FEB 1 1 2008
DENR - WATER QUAU~
~I,pr1DS AND 5'fORMWATER BRAN

ABM Associates, LLC
Page 2 of 2
November 28, 2007
2. The submittal does not include enough information for the DWQ to evaluate the level spreader
serving drainage area 5. Please provide the plan details for this level spreader (they are not on
Plan Sheet 9 as stated in the Required Items Checklist).
Please provide the following items as listed on the Required Items Checklist and provide page
numbers for these items in your resubmittal so that the DWQ can reference them efficiently.
a. An assurance that the installed system will meet design specifications upon initial
operation once the project is complete.
b. The supporting calculations.
c. A copy of the deed restriction that protects the level spreader device.
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 discu this matter.
Sinc ly,
CBK/ijm
Cyndi Karoly, Supervisor
401 OversightlExpress Review Permitting Unit
cc: Lauren Witherspoon, DWQ Raleigh Regional Office
USACE Raleigh Regulatory Field Office
File Copy
Central Files
Todd Preuninger, Withers & Ravenel, 111 MacKenan Drive, Cary, NC 27511
061154Ver1AssociatesParkQ(Wake)On_Hold

LEVEL SPREADER SYSTEM OPERATION AND MAINTENANCE AGREEMENT (1/2007)
A level spreader system includes: a forebay, diverter box, level spreader, riparian buffer/vegetated filter strip,
and flow bypass channel.
Name of Project: Associate Park II
Address: HWY 401 North, Fuquay-Varina, NC
Maintenance activities shall be pertormed as follows:
MAINTENANCE ACTIVITY FREQUENCY
Post-construction monitoring-inspect for vegetation, Check after every heavy rainfall for first 6 months
settlin ,erosion, or concentrated flow. followin construction.
Inspect Diverter Box and clean and/or make repairs. Once a month and after heavy rainfalls/storms.
Look for:
• Clogged inlet or outlet pipes.
• Trash/debris in the box.
Inspect Forebay + Level Spreader. Clean and/or Once a month and after heavy rainfalls/storms.
make repairs. Look for:
• Sediment in forebay and along level spreader
lip;
• Trash and/or leaf buildup.
• Scour, undercutting of level spreader.
• Settlement of level spreader structure (no
longer level; you see silt downhill below level
spreader).
• Fallen trees on level spreader.
• #57 stone washin downhill.
Inspect the Riparian Buffer and the Bypass Swale Once a month and after heavy rainfalls/storms.
and make repairs as needed'. Look for:
• Damaged tun` reinforcement or riprap rolling
downhill
• Erosion within the buffer or swale.
• Concentrated flows downhill of level
s reader-look for ullies or sediment flows.
Mow grass to a 6" height. As needed during growing season.
Remove any weeds/shrubs growing on level spreader Once a year.
or in swale.
1 NOTE: Contact NC Division of Water Quality, 401/Wetlands Unit at 919-733-1786 BEFORE any work
in Protected Riparian Buffers.
Page 1 of 2

LEVEL
SPREADER N0. LOCATION ON SITE (DESCRIBE) HOW WILL IT BE ACCESSED?
1 At Entrance Easement from Industry Drive
2 At Pump Station Access Road to Pump Station
3
4
5
6
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: Johnny BJ~nkerlship
Address: 2204-F Associate Drive, Raleigh, NC 27603
Phor
Sign.
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 been named the president.
1, ~o+~r~a ~5 , a Notary Public for the State of North Carolina, County of
t,Ja~(t~ , do hereby c(e~rtify that t~~u ~I A,n ~tv~ S~~p personally
appeared before me this ~ day of Uc~olo,u2. , aoo~ ,and acknowledge the due execution of
the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and official seal,
s -. -~-
;..~
k.
w ` ~!.
~:~~ as~~.A t~ `tea
SEAL My commission expires 7 ~8 ~.n~o _
Page 2 of 2

Date: ~0• x-07
COMPLIANCE WITH WETLAND & BUFFER REGULATIONS
In accordance with Title 15 A NCAC 2H .0500, the following DEED NOTIFICATION shall be'
recorded in the Wake County Registry prior to the conveyance of lots. Said Deed
Notification shall apply to name of subdivision, lot numbers 7,s,s,~o,~~,12 in wake~ounty, North
Carolina as shown on plans titled Associates Park II prepared by
Withers & Ravenel (insert name of designer) dated date: 8-10-07
"A portion of this lot has been determined to meet the requirements for designation as a wetland,
stream or protected stream buffer. Any subsequent fill or alteration of this area shall conform to
the requirements of the state rules adopted by the State of North Carolina in force at the time. of
the proposed alteration. The intent of this provision is to prevent additional wetland, stream or
buffer filling or draining, so the property owner should not assume that a future application for
filling or draining would be approved. The property owner shall report the name of the subdivision
in any application pertaining to said rules. This covenant is intended to ensure continued
compliance with all rules adopted by the State of North Carolina and therefore the State of North
Carolina may enforce benefits. This covenant is to run with the land and shall be binding on all
Parties and all persons claiming under them".
Signature:
Owner's name: ABM Associates, LLC
Address: 2204-F Associates Drive
City, State, Zip Code: Raleigh, NC 27603
Phone Number: 919-772-4310

.#ii~i ~~o~ WATe~o''
.,~r«
NCDENR p Y
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part III) must be printed, filled out and submitted along with all of the required information.
I. PROJt=CT INFORMATION _
_ __
Project name _
Associate Park ll
Contact name Hunter Freeman
Phone number 919.469-3340
Date February 5, 2006
Drainage area number
Level
II. D)_S1GN INFORMATION __
For Level Spreaders Receiving Flow From a BMP
Type of BMP None
Drawdown flow from the BMP cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area 13,939 ftz
Impervious surface area 6,969. ftz
Percent impervious 0.50
Rational C coefficient 0`65'
Peak flow from the 1 in/hr storm 0.207997016 cfs
Time of concentration min
Rainfall intensity, 10-yr storm 7.22 in/hr
Peak flow from the 10-yr storm 1.501738453 cfs
Where Does the Level Spreader Discharge?
To a bioretention cell? n (Y or N)
To a wetland? n (Y or N)
To a filter strip or riparian buffer? y (Y or N) Please complete filter strip characterization below.
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass 50 ft
Width of dense ground cover 0 ft
Width of wooded vegetation 0 ft
Total width 50 ft
Slope (from level lip to to top of bank) 1
Are any draws present? n (Y or N) OK
Level Spreader Design
Forebay surface area 30 sq ft
Feet of level lip needed per cfs 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, 24-hr storm? n (Y or N)
Length based on the BMP discharge rate? n (Y or N)
Design flow 0.6 cfs
Is a bypass device provided? y (Y or N)
Length of the level lip 26 ft
Are level spreaders in series? n (Y or N)
OK
OK
Level spreader length OK.
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.3 Parts I. and II. Design Summary, page 1 of 3

Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland? Design for Q10 (Y or N)
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M ft
B ft
W ft
y ft
Peak velocity in the channel during the 10-yr, 24-hr storm cfs
Channel lining material
. w .;
, ~
1 i------------
M
~ B ~
---i 1
M
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.3 Parts I. and II. Design Summary, page 2 of 3

III. REQUIRED ITEMS CHECKLIST
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.
Pagel Plan
Ini ' Is Sheet No.
~~ 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,
- Recorded drainage easement and public right of way (ROW), and
- Boundaries of drainage easement.
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,
-Recorded drainage easement, and

~7 -Design at ultimate build-out.
3. Section view of the level spreader (1" = 20' or larger) showing:
- Undertlrain system (if applicable),
- Level lip,
- Upslope channel, and
~~,,~~""''~~~~
~I~±+aO -Downslopefilterfabric.
4. Adate-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
.~ ~ 5. An assurance that the installed system will meet design specifications upon initial operation once the

t~~A project is complete and the entire drainage area is stabilized.
6. A construction sequence that shows how the level spreader will be protected from sediment until the entire
C~ drainage area is stabilized.
7. The supporting calculations.
8. A copy of the signed and notarized inspection and maintenance (1&M) agreement.
9. A copy of the deed restriction.
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.3 Part III, page 3 of 3

Level Spreader 1 Buffer Photo

O~O~ W ATE~O
~h _~ y
..Fw~IMr/+M~ cw\.w~s"w
~~M~~ o -c
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be >flled out, printed and submitted.
The Required Items Checklist (Part Ill) must be printed, filled ouf and submitted along with all of the required information.
I: PRDJECT'INFORMATION --~
Project name \ssociate Park II
Contact name Hunter Freeman
Phone number
Date
Drainage area number
91969-3340
February 5, 2006
Leve! Spreader 2
IL`" DESIGN'1NFDRMATION
For Level Spreaders Receiving Flow From a BMP
Type of BMP Dry Pond
Drawdown flow from the BMP 2.12 cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area ftz
Impervious surface area ftZ
Percent impervious
Rational C coefficient
Peak flow from the 1 in/hr storm cfs
Time of concentration min
Rainfall intensity, 10-yr storm in/hr
Peak flow from the 10-yr storm cfs
Where Does the Level Spreader Discharge?
To a bioretention cell? n (Y or N)
To a wetland? n (Y or N)
To a filter strip or riparian buffer? y (Y or N)
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass 40 ft
Width of dense ground cover 0 ft
Width of wooded vegetation 10 ft
Total width 50 ft
Slope (from level lip to to top of bank) 1
Are any draws present? n (Y or N)
Level Spreader Design
Forebay surface area 0 sq ft
Feet of level lip needed per cfs 23 ftlcfs
Answer "Y" to one of the following:
Length based on the 1 in/hr storm? n (Y or N)
Length based on the 10-yr, 24-hr storm? n (Y or N)
Length based on the BMP discharge rate? y (Y or N)
Design flow 2.12 cfs
Is a bypass device provided? y (Y or N)
Length of the level lip 46 ft
Are level spreaders in series? n (Y or N)
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Please complete filter strip characterization below.
OK
Forebay is undersized. ~ ~MS.c1~7 c~r~ L.~Ye~
~¢~v~...~-gyp .
OK
#VALUE!
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.3 Parts I. and II. Design Summary, page 1 of 3

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
W
Y
Peak velocity in the channel during the 10-yr, 24-hr storm
Channel lining material
(Y or N)
Y
2.5 ft
2 ft
12 ft
1 ft
3.48 cfs
Synthetic Liner
,t w -,
,~bx
i i------------
M
~~
B ~
1
M
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.3 Parts I. and II. Design Summary, page 2 of 3

III. REQUIREp ITEfdIS CHECKLIST
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.
Pagel Plan
Initi s Sheet No.
~_ 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,
- Recorded drainage easement and public right of way (ROW), and
- Boundaries of drainage easement.
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,
-Recorded drainage easement, and
-Design at ultimate build-out.
.~ 3. Section view of the level spreader (1" = 20' or larger) showing:
- Underdrain system (if applicable),
- Level lip,
- Upslope channel, and

~#~6Ji~ - Downslope filter fabric.
4. Adate-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
lcJt[i~ 5. An assurance that the installed system will meet design specifications upon initial operation once the

~a~ project is complete and the entire drainage area is stabilized.
6. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
'lc.alto 7. The supporting calculations.
T 8. A copy of the signed and notarized inspection and maintenance (I&M) agreement.
~L 9. A copy of the deed restriction.
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.3 Part III, page 3 of 3

Bypass Ditch

Project Description
Friction Method Manning Formula
Solve For Normal Depth
Input Data
Roughness Coefficient 0.035
Channel Slope 0.01000 ft/ft
Left Side Slope 2.50 ft/ft (H:V)
Right Side Slope 2.50 ft/ft (H:V)
Bottom Width 2.00 ft
Discharge 22.85 ft'/s
Results
Normal Depth 1.27 ft
Flow Area 6.56 ftZ ~II' ~5
Wetted Perimeter 8.83 ft V
Top Width 8.34 ft ~ 1~~
~ D
Critical Depth 1.06 ft (~
Critical Slope 0.02189 ft/ft
Velocity 3.48 ft/s ~E,,~~'rL ~s'S' MdL. = 2 • v ~Sl ~, Z
Velocity Head 0.19 ft
O~
Specific Energy 1.46 ft ~
Froude Number 0.69
Flow Type Subcritical
GVF Input Data
Downstream Depth 0.00 ft
Length 0.00 ft
Number Of Steps 0
GVF-Output Oata
Upstream Depth 0.00 ft
Profile Description
Profile Headloss 0.00 ft
Downstream Velocity Infinity ft/s
Upstream Velocity Infinity ft/s
Normal Depth 1.27 ft
Critical Depth 1.06 ft
Channel Slope 0.01000 ft/ft
Critical Slope 0.02189 ft/ft
Bentley Systems, Inc. Haestad Methods Solution Center FlowMaster [08.01.058.00]
2/5!2008 2:01:08 PM 27 Siemons Company Drive Suite 200 W Watertown, CT 08795 USA [phone] Page 1 of 1

Job File: K:\06\06-0540\060543-Associate Park II\H-H\Dry Pond\DRYPOND.PPW
' Rain Dir: K:\06\06-0540\060593-Associate Park II\H-H\Dry Pond\
JOB TITLE
Project Date: 1/24/2008
Project Engineer: Derick Hopkins
Project Title: Dry Pond Level Spreader
Project Comments:
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 8:13 AM 2/11/2008

Table of Contents
i
********************** MASTER SUMMARY ****+*****************
Watershed....... Master Network Summary ............. 1.01
****************** DESIGN STORMS SUMMARY *******************
RDU NOAA 14 Desi Design Storms ...................... 2.01
********************** TC CALCULATIONS ***+*****************
SUBAREA 10...... Tc Calcs ........................... 3.01
********************** CN CALCULATIONS **********+**********
SUBAREA 10...... Runoff CN-Area ..................... 4.01
*********************** POND VOLUMES ***********************
POND 10......... Vol: Elev-Area ..................... 5.01
******************** OUTLET STRUCTURES *********************
Outlet 1........ Outlet Input Data .................. 6.01
S/N: DOYXYWH3NLBE
PondPack (10.00.015.00)
8:13 AM
Withers & Ravenel
2/11/2008

Table of Contents
ii
Composite Rating Curve ............. 6.06
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 8:13 AM 2/11/2008

Type.... Master Network Summary Page 1.01
Name.... Watershed
File.... K:\06\06-0540\060543-Associate Park II\H-H\Dry Pond\DryPond.ppw
MASTER DESIGN STORM SUMMARY
Network Storm Collection: RDU NOAA 14 Desi
Total
Depth Rainfall
Return Event in Type RNF ID
10 4.9800 Time-Depth Curve RDU NOAA l0yr
100 7.3700 Time-Depth Curve RDU NOAA 100yr
1 3.0000 Synthetic Curve TypeII 24hr
MASTER NETWORK SUMMARY
SCS Unit Hydrograph Method
(*Node=Outfall; +Node=Diversion;)
(Trun= HYG Truncation: Blank=None; L=Left; R=Rt; LR=Left&Rt)
Max
Return HYG Vol Qpeak Qpeak Max WSEL Pond Storage
Node ID Type Event ac-ft Trun min cfs ft ac-ft
*JUNC 10 JCT 10 1.271 726.00 22.85
*JUNC 10 JCT 100 2.185 729.00 29.34
*JUNC 10 JCT 1 .572 720.00 9.88
POND 10 IN POND 10 1.271 726.00 24.30
POND 10 IN POND 100 2.186 726.00 33.55
POND 10 IN POND 1 .572 717.00 10.34
POND 10 OUT POND 10 1.271 726.00 22.85 279.06 .123
POND 10 OUT POND 100 2.185 729.00 29.34 279.33 .139
POND 10 OUT POND 1 .572 720.00 9.88 278.79 .107
SUBAREA 10 AREA 10 1.271 726.00 24.30
SUBAREA 10 AREA 100 2.186 726.00 33.55
SUBAREA 10 AREA 1 .572 717.00 10.34
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 8:13 AM 2/11/2008

Type.... Design Storms Page 2.01
Name.... RDU NOAA 14 Desi
File.... K:\06\06-0540\060543-Associate Park II\H-H\Dry Pond\DryPond.ppw
Title... Project Date: 1/24/2008
Project Engineer: Derick Hopkins
Project Title: Dry Pond Level Spreader
Project Comments:
DESIGN STORMS SUMMARY
Design Storm File,ID =
Storm Tag Name = 10
Data Type, File, ID
Storm Frequency
Total Rainfall Depth
Duration Multiplier
Resulting Duration
Resulting Start Time
RDU NOAA 14 Desi
Time-Depth Curve RDU NOAA l0yr
10 yr
4.9800 in
1
1439.42 min
.00 min Step= 5.00 min End= 1439.42 min
Storm Tag Name = 100
Data Type, File, ID = Time-Depth Curve RDU NOAA 100yr
Storm Frequency = 100 yr
Total Rainfall Depth= 7.3700 in
Duration Multiplier = 1
Resulting Duration = 1439.94 min
Resulting Start Time= .00 min Step= 5.00 min End= 1439.94 min
Storm Tag Name = 1
Data Type, File, ID
Storm Frequency
Total Rainfall Depth
Duration Multiplier
Resulting Duration
Resulting Start Time
Synthetic Storm TypeII 24hr
1 yr
3.0000 in
1
1440.00 min
.00 min Step= 6.00 min End= 1440.00 min
S/N: DOYXYWH3NLBE
PondPack (10.00.015.00)
8:13 AM
Withers & Ravenel
2/11/2008

Type.... Tc Calcs
Name.... SUBAREA 10
Page 3.01
File.... K:\06\06-0540\060543-Associate Park II\H-H\Dry Pond\DryPond.ppw
........................................................................
........................................................................
TIME OF CONCENTRATION CALCULATOR
........................................................................
........................................................................
Segment #1: Tc: User Defined
Segment #1 Time: 5.00 min
Total Tc: 5.00 min
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 8:13 AM 2/11/2008

Type.... Tc Calcs
Name.... SUBAREA 10
Page 3.02
File.... K:\06\06-0540\060543-Associate Park II\H-H\Dry Pond\DryPond.ppw
Tc Equations used...
___= User Defined ______________________________________________________
Tc = Value entered by user
Where: Tc = Time of concentration
S/N: DOYXYWH3NLBE
PondPack (10.00.015.00)
8:13 AM
Withers & Ravenel
2/11/2008

Type.... Runoff CN-Area
Name.... SUBAREA 10
Page 4.01
File.... K:\06\06-0540\060543-Associate Park II\H-H\Dry Pond\DryPond.ppw
RUNOFF CURVE NUMBER DATA
..........................................................................
..........................................................................
Impervious
Area Adjustment Adjusted
Soil/Surface Description CN acres %C oUC CN
Impervious 98 2.790 98.00
Open space (Lawns,parks etc.) - Goo 61 2.190 61.00
COMPOSITE AREA & WEIGHTED CN ---> 4.980 81.73 (82)
...........................................................................
...........................................................................
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 8:13 AM 2/11/2008

Type.... Vol: Elev-Area
Name.... POND 10
Page 5.01
File.... K:\06\06-0540\060543-Associate Park II\H-H\Dry Pond\DryPond.ppw
Elevation Planimeter Area Al+A2+sgr(Al*A2) Volume Volume Sum
(ft) (sq.in) (sq.ft) (sq.ft) (ac-ft) (ac-ft)
276.00 ----- 1068 0 .000 .000
277.00 ----- 1445 3755 .029 .029
278.00 ----- 1934 5051 .039 .067
279.00 2551 6706 .051 .119
280.00 3172 8568 .066 .184
POND VOLUME EQUATIONS
* Incremental volume computed by the Conic Method for Reservoir Volumes.
Volume (1/3) * (EL2-EL1) * (Areal + Areal + sq.rt.(Area1*Area2))
where: ELl, EL2 = Lower and upper elevations of the increment
Areal,Area2 =Areas computed for ELl, EL2, respectively
Volume = Incremental volume between EL1 and EL2
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 8:13 AM 2/11/2008

Type.... Outlet Input Data
Name.... Outlet 1
Page 6.01
File.... K:\06\06-0540\060543-Associate Park II\H-H\Dry Pond\DryPond.ppw
REQUESTED POND WS ELEVATIONS:
Min. Elev.= 276.00 ft
Increment = .10 ft
Max. Elev.= 280.00 ft
OUTLET CONNECTIVITY
---> Forward Flow Only (Upstream to DnStream)
<--- Reverse Flow Only (DnStream to Upstream)
<---> Forward and Reverse Both Allowed
Structure No. Outfall El, ft E2, ft
Inlet Box RO ---> B2 278.500 280.000
Culvert-Circular B2 ---> TW 275.100 280.000
Orifice-Circular OR ---> BA 276.000 280.000
Culvert-Circular BA ---> TW 276.000 280.000
TW SETUP, DS Channel
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 8:13 AM 2/11/2008

Type.... Outlet Input Data
Name.... Outlet 1
Page 6.02
File.... K:\06\06-0540\060543-Associate Park II\H-H\Dry Pond\DryPond.ppw
OUTLET STRUCTURE INPUT DATA
Structure ID = RO
Structure Type = Inlet Box
-
-------------------
# of Openings = ---------------
-
1
Invert Elev. = 278.50 ft
Orifice Area = 16.0000 sq.ft
Orifice Coeff. _ .600
Weir Length = 16.00 ft
Weir Coeff. = 3.000
K, Reverse = 1.000
Mannings n = .0000
Kev,Charged Riser = .000
Weir Submergence = No
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 8:13 AM 2/11/2008

Type.... Outlet Input Data
Name.... Outlet 1
Page 6.03
File.... K:\06\06-0540\060543-Associate Park II\H-H\Dry Pond\DryPond.ppw
OUTLET STRUCTURE INPUT DATA
Structure ID = B2
Structure Type = Culvert-Circular
No. Barrels = 1
Barrel Diameter = 2.0000 ft
Upstream Invert = 275.10 ft
Dnstream Invert = 275.00 ft
Horiz. Length = 25.00 ft
Barrel Length = 25.00 ft
Barrel Slope = .00400 ft/ft
OUTLET CONTROL DATA...
Mannings n = .0130
Ke = .5000
Kb = .012411
Kr = .5000
HW Convergence = .001
INLET CONTROL DATA...
Equation form = 1
Inlet Control K = .0098
Inlet Control M = 2.0000
Inlet Control c = .03980
Inlet Control Y = .6700
T1 ratio (HW/D) _ .000
T2 ratio (HW/D) = 1.305
Slope Factor = -.500
(forward entrance loss)
(per ft of full flow)
(reverse entrance loss)
+/- ft
Use unsubmerged inlet control Form 1 equ. below T1 elev.
Use submerged inlet control Form 1 equ. above T2 elev.
In transition zone between unsubmerged and submerged inlet control,
interpolate between flows at Tl & T2..:,
At T1 Elev = 275.10 ft ---> Flow = 15.55 cfs
At T2 Elev = 277.71 ft ---> Flow = 17.77 cfs
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 8:13 AM 2/11/2008

Type.... Outlet Input Data
Name.... Outlet 1
Page 6.04
File.... K:\06\06-0540\060543-Associate Park II\H-H\Dry Pond\DryPond.ppw
OUTLET STRUCTURE INPUT DATA
Structure ID = OR
Structure Type = Orifice-Circular
# of Openings = 1
Invert Elev. = 276.00 ft
Diameter = .6670 ft
Orifice Coeff. _ .600
Structure ID = BA
Structure Type = Culvert-Circular
No. Barrels = 1
Barrel Diameter = 1.2500 ft
Upstream Invert = 276.00 ft
Dnstream Invert = 275.80 ft
Horiz. Length = 35.00 ft
Barrel Length = 35.00 ft
Barrel Slope = .00571 ft/ft
OUTLET CONTROL DATA ...
Mannings n = .0130
Ke = .5000 (forward entrance loss)
Kb = .023225 (per ft of full flow)
Kr = .5000 (reverse entrance loss)
HW Convergence = .001 +/- ft
INLET CONTROL DATA. ..
Equation form = 1
Inlet Control K = .0098
Inlet Control M = 2.0000
Inlet Control c = .03980
Inlet Control Y = .6700
T1 ratio (HW/D) _ .000
T2 ratio (HW/D) = 1.304
Slope Factor = -.500
Use unsubmerged inlet control Form 1 equ. below Tl elev.
Use submerged inlet control Form 1 equ. above T2 elev.
In transition zone between unsubmerged and submerged inlet control,
interpolate between flows at Tl & T2...
At T1 Elev = 276.00 ft ---> Flow = 4.80 cfs
At T2 Elev = 277.63 ft ---> Flow = 5.49 cfs
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 8:13 AM 2/11/2008

Type.... Outlet Input Data
Name.... Outlet 1
Page 6.05
File.... K:\06\06-0540\060543-Associate Park II\H-H\Dry Pond\DryPond.ppw
OUTLET STRUCTURE INPUT DATA
Structure ID = TW
Structure Type = TW SETUP, DS Channel
FREE OUTFACE CONDITIONS SPECIFIED
CONVERGENCE TOLERANCES...
Maximum Iterations= 40
Min. TW tolerance = .Ol ft
Max. TW tolerance = .01 ft
Min. HW tolerance = .O1 ft
Max. HW tolerance = .O1 ft
Min. Q tolerance = .00 cfs
Max. Q tolerance = .00 cfs
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 8:13 AM 2/11/2008

Type.... Composite Rating Curve
Name.... Outlet 1
Page 6.06
File.... K:\06\06-0540\060543-Associate Park II\H-H\Dry Pond\DryPond.ppw
***** COMPOSITE OUTFLOW SUMMARY ****
WS Elev, Total Q Notes
-------- -------- ----- --- Converge ------------- ------------
Elev. Q TW Elev Error
ft
---
- cfs
--
---- ft +/-ft
-----
--- Contributing Structures
---
-
276.00 -
.00
Free --- --
Outfall --------------
(no Q: RO,B2 ------------
,OR,BA)
276.10 .02 Free Outfall OR,BA (no Q: RO,B2)
276.20 .08 Free Outfall OR,BA (no Q: RO,B2)
276.30 .16 Free Outfall OR,BA (no Q: RO,B2)
276.40 .26 Free Outfall OR,BA (no Q: RO,B2)
276.50 .40 Free Outfall OR,BA (no Q: RO,B2)
276.60 .55 Free Outfall OR,BA (no Q: RO,B2)
276.70 .73 Free Outfall OR,BA (no Q: RO,B2)
276.80 .84 Free Outfall OR,BA (no Q: RO,B2)
276.90 .94 Free Outfall OR,BA (no Q: RO,B2)
277.00 1.04 Free Outfall OR,BA (no Q: RO,B2)
277.10 1.13 Free Outfall OR,BA (no Q: RO,B2)
277.20 1.22 Free Outfall OR,BA (no Q: RO,B2)
277.30 1.30 Free Outfall OR,BA (no Q: RO,B2)
277.40 1.38 Free Outfall OR, BA (no Q: RO,B2)
277.50 1.46 Free Outfall OR, BA (no Q: RO,B2)
277.60 1.54 Free Outfall OR,BA (no Q: RO,B2)
277.70 1.61 Free Outfall OR, BA (no Q: RO,B2)
277.80 1.68 Free Outfall OR, BA (no Q: RO,B2)
277.90 1.75 Free Outfall OR, BA (no Q: RO,B2)
278.00 1.81 Free Outfall OR,BA (no Q: RO,B2)
278.10 1.88 Free Outfall OR,BA (no Q: RO,B2)
278.20 1.94 Free Outfall OR,BA (no Q: RO,B2)
278.30 2.00 Free Outfall OR,BA (no Q: RO,B2)
278.40 2.06 Free Outfall OR,BA (no Q: RO,B2)
278.50 2.12 Free Outfall OR,BA (no Q: RO,B2)
278.60 3.69 Free Outfall RO,B2,OR,BA
278.70 6.52 Free Outfall RO,B2,OR,BA
278.80 10.17 Free Outfall RO,B2,OR,BA
278.90 14.48 Free Outfall RO,B2,OR,BA
279.00 19.36 Free Outfall RO,B2,OR,BA
279.10 24.74 Free Outfall RO,B2,OR,BA
279.20 28.67 Free Outfall RO,B2,OR,BA
279.30 29.19 Free Outfall RO,B2,OR,BA
279.40 29.70 Free Outfall RO,B2,OR,BA
279.50 30.20 Free Outfall RO,B2,OR,BA
279.60 30.70 Free Outfall RO,B2,OR,BA
279.70 31.19 Free Outfall RO,B2,OR,BA
S/N: DOYXYWH3NLBE
PondPack (10.00.015.00)
8:13 AM
Withers & Ravenel
2/11/2008

Type.... Composite Rating Curve
Name.... Outlet 1
Page 6.07
***** COMPOSITE OUTFLOW SUMMARY ****
WS Elev, Total Q Notes
-------- --------
--------
Converge
-------------------------
Elev. Q TW Elev Error
ft cfs ft +/-ft Contributing Structures
279.80 31.66 Free Outfall RO,B2,OR,BA
279.90 32.13 Free Outfall RO,B2,OR,BA
280.00 32.60 Free Outfall RO,B2,OR,BA
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 8:13 AM 2/11/2008

_ Appendix A
Index of Starting Page Numbers for ID Names
----- 0 -----
Outlet 1... 6.01, 6.06
----- P
POND 10... 5.01
----- R -----
RDU NOAA 14 Desi... 2.01
----- S -----
SUBAREA 10... 3.01, 4.01
----- W -----
Watershed... 1.01
A-1
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 8:13 AM 2/11/2008

Level Spreader 2 Bypass

Project Description
Friction Method Manning Formula
Solve For Normal Depth
Input Data
Roughness Coefficient 0.035
Channel Slope 0.02400 ft/ft ~- $
Left Side Slope 3.00 ft/ft (H:V)
Right Side Slope 3.00 ft/ft (H:V)
Bottom Width 2.00 ft
Discharge 26.40 ft'/s
Results
Normal Depth 1.06 ft c'-- '~
Flow Area 5.47 ftZ
Wetted Perimeter 8.69 ft
Top Width 8.34 ft
Critical Depth 1.08 ft
Critical Slope 0.02154 ft/ft
Velocity 4.83 ft/s
Velocity Head 0.36 ft
Specific Energy 1.42 ft
Froude Number 1.05
Flow Type Supercritical
GVF Input Da#a
Downstream Depth 0.00 ft
Length 0.00 ft
Number Of Steps 0
GVF Output Data
Upstream Depth 0.00 ft
Profile Description
Profile Headloss 0.00 ft
Downstream Velocity Infinity ft/s
Upstream Velocity Infinity ft/s
Normal Depth 1.06 ft
Critical Depth 1.08 ft
Channel Slope 0.02400 ft/ft
Critical Slope 0.02154 ft/ft
,~,~~~ s G~.cf x 1.b6 ~ 0.v2~{
z ~ .fig ~b~s~
~--
Bentley Systems, Inc. Haestad Methods Solution Center FlowMaster [08.01.058.00]
1/11/2008 3:01:56 PM 27 Siemons Company Drive Suite 200 W Watertown, CT 08795 USA [phone] Page 1 of 1

Low Density Commercial Subdivisions
Deed Restrictions & Protective Covenances
In accordance with Title 15 NCAC 2H.1000, the Stormwater Management Regulations, deed restrictions and
protective covenants are required for Low Density Commercial Subdivisions where lots will be subdivided and
sold. The deed restrictions and protective covenants are necessary to ensure that the development maintains
a "built-upon" area consistent with the permitted maximum to maintain overall low density.
1, ,acknowledge, affirm and agree by my signature below, that I will
cause the following deed restrictions and covenants to be recorded prior to the sale of any lot within the project
known as
1. The following covenants are intended to ensure ongoing compliance with State Stormwater
Management Permit Number , as issued by the Division of Water Quality under
NCAC 2H.1000.
2. The State of North Carolina is made a beneficiary of these covenants to the extent necessary to
maintain compliance with the stormwater management permit.
3. These covenants are to run with the land and be binding on all persons and parties claiming under
them.
4. The covenants pertaining to stormwater may not be altered or rescinded without the express written
consent of the State of North Carolina, Division of Water Quality.
5. Alteration of the drainage as shown on the approved plan may not take place without the concurrence
of the Division of Water Quality.
6. The maximum allowable built-upon area per lot is square feet. {Or, if the BUA per lot
varies, use the following format & language (in bold type)}:
The maximum allowable built-upon area per lot is as follows:
Lot # BUA Lot # BUA Lot # BUA
The allotted amount includes any built-upon area constructed within the lot property boundaries, and
that portion of the right-of--way between the front lot line and the edge of the pavement. Built upon area
includes, but is not limited to, structures, asphalt, concrete, gravel, brick, stone, slate, and coquina, but
does not include raised, open wood decking, or the water surface of swimming pools.
7. In the case of a lot within CAMA's regulated AEC, if the built-upon area for that lot, as calculated by
CAMA, is less than the amount shown in these restrictions, the most restrictive BUA will be the
maximum permitted limit for that lot.
8 Filling in or piping of any vegetative conveyances (ditches, swa/es, etc.) associated with the
development except for average driveway crossings, is strictly prohibited by any persons.
9. Each lot will maintain a 30' wide vegetated buffer between all impervious areas and surface waters.
10. All roof drains shall terminate at least 30' from the mean high water mark of surface waters.
11. Each lot, whose ownership is not retained by the permittee, shall submit a separate low density
stormwater permit application to the Division of Water Quality and receive a permit prior to construction.
Lots retained by the permittee shall be submitted as modifications to the original permit.
12. No lot shall be allowed to exceed the maximum allowable built-upon area unless the permit is modified
to high density for all of the lots in the permitted subdivision.
Signature: Date:
1, , a Notary Public in the State of
,County of , do hereby
certify that personally appeared before me this the
day of , 20 ,and acknowledge the due execution of the foregoing
instrument. Witness my hand and official seal, SEAL
Notary Signature
My Commission expires
Form DRPC-4 Rev.l Page 1 of 1

High Density Commercial Subdivisions
Deed Restrictions & Protective Covenances
In accordance with Title 15 NCAC 2H.1000, the Management Regulations, deed restrictions and
protective covenants are required for High Density Commercial Subdivisions where lots will be
subdivided and sold and runoff will be treated in an engineered stormwater control facility. Deed
restrictions and protective covenants are necessary to ensure that the development maintains abuilt-
upon area consistent with the design criteria used to size the stormwater control facility.
I, ,acknowledge, affirm and agree by my signature below, that
I will cause the following deed restrictions and covenants to be recorded prior to the sale of any lot
within the project known as
1. The following covenants are intended to ensure ongoing compliance with State stormwater
Management Permit Number , as issued by the Division of Water Quality
under NCAC 2H.1000.
2. The State of North Carolina is made a beneficiary of these covenants to the extent necessary to
maintain compliance with the stormwater management permit.
3. These covenants are to run with the land and be binding on all persons and parties claiming
under them.
4. The covenants pertaining to stormwater may not be altered or rescinded without the express
wriften consent of the State of North Carolina, Division of Water Quality.
5. Alteration of the drainage as shown on the approved plan may not take place without the
concurrence of the Division of Water Quality.
6. The maximum allowable built-upon area per lot is square feet. {OR, if the
proposed built-upon area per lot will vary, please use the following format & language (in bold):
The maximum built-upon area per lot, in square feet, is as listed below:
Lot # BUA Lot # BUA Lot # BUA Lot # BUA
This allotted amount includes any built-upon area constructed within the lot property boundaries,
and that portion of the right-of--way between the front lot line and the edge of the pavement. Built
upon area includes, but is not limited to, structures, asphalt, concrete, gravel, brick, stone, slate,
coquina and parking areas, but does not include raised, open wood decking, or the water
surface of swimming pools.
7. All runoff from the built-upon areas on the lot must drain into the permitted system. This maybe
accomplished through a variety of means including roof drain gutters which drain to the street,
grading the lot to drain toward the street, or grading perimeter swales to collect the lot runoff
and directing them into a component of the stormwater collection system. Lots that will naturally
drain into the system are not required to provide these additional measures.
8. The owner of each lot, whose ownership is not retained by the permiftee, is required to submit a
separate stormwater permit application to the Division of Water Quality and receive a permit
prior to construction.
Signature: Date:
I, , a Notary Public in the
State of ,County of ,
do hereby certify that personally appeared
before me this the day of , 20 ,and acknowledge
the due execution of the foregoing instrument. Witness my hand and official seal,
SEAL
Signature
My Commission expires
Form DRPC-1 Rev.1 Page 1 of 1