20061421 Ver 1_Stormwater Info_20061009

October 6, 2006
S&EC Project #10409.W2
DWQ Project#06-1421
Department of Environment and Natural Resources
Division of Water Quality
Attn: Cyndi Karoly/Cynthia Van Der Wiele/Lia Myott
2321 Crabtree Boulevard
Suite 250
Raleigh, NC 27604
Re: Revised Stormwater Management Plan
Middle Creek Commons-EXPRESS REVIEW PROGRAM
Clayton, Johnston County, NC
To Whom It May Concern:
The purpose of this letter is to send a revised Stormwater Management Plan for the subject project. This project is
still within the Express Review Program for review and approval. The applicant received a revision request from the
Town of Clayton requiring the applicant to develop a Stormwater Management Plan that would be designed to treat
80% impervious instead of 67%, as previously designed and submitted for your review. This required the
constructed wetland to be modified and redesigned to include an additiona12,000 ft 2 therefore this BMP has been
expanded towards the western property line. This modification has not resulted in any additional impacts to
jurisdictional wetlands
This issue was brought to the DWQ's attention on October 3, 2006. We were advised that if we could get the
signed/notarized O&M agreement to your office along with the modified stormwater plan (to include the revised
constructed wetland) by October 9~'; that the DWQ would have no problem reviewing it under the same project and
fee.
We anticipate that this will include the remainder of information needed for the DWQ to complete the final review
process fora 401 Water Quality Certification. If you have any questions or if any additional explanation is needed;
please don't hesitate to call.
Sincerely,
~~~~~ ~ ' ~~v~ c
Debbie Edwards
Environmental Specialist
CC: David Smith-Regency Centers, 101 Maynard Crossing Court, Suite 211, Cary, NC 27513
Attachments:
1) Revised Storm Drainage Calculations package
1) Signed and notarized Operations & Maintenance Agreements (Wetland Detention & Level Spreader)
2) Revised Extended Detention Wetland Worksheet & Level Spreader Worksheet
3) Revised Plan Sheet C4.0
Charlotte Office: Greensboro Office:
236 LePhillip Court, Suite C 3817-E Lawndale Drive
Concord, NC 28025 Greensboro, NC 27455
Phone: [phone] Phone: [phone]
Fax: [phone] Fax: [phone]
Environmental Consultants, PA
Road Raleigh, North Carolina 27614 Phone: [phone] Fax: [phone]

STORM DRAINAGE
CALCULATIONS
FOR
~IDQLE CREED CO~~ONS
P ROB ECT N O. 06-4013
OCTOBER 2006
JOFiNSTON COUNTY
NORTH CAROLINA
Prepared ~y:
Chas. H. Sells, lnc.
15401 4'16eston Parkway, Suite 100
Cary, NC 27513
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Project Manager: Donald A. Sever, P.E.

CHAS. H. SELLS, INC.
TABLE OF CONTENTS
MIDDLE CREEK
COMMONS
General Information
Impervious Area
Peak Runoff Reduction
Existing Drainage ways
P~itrogen Calculations
Pre and Post Development Flows
Stormwater Drainage Calculations
BMP Design Calculations
Velocity Dissipator Calculations
Reservoir Watershed Protection Impoundment
Maintenance Agreement
Operations and Maintenance Manual

Project Name: Middle Creek Commons Shopping Center
Location: NC 42 /NC 50 Southwest intersection. Located approximately 0.5 mite
east of the Wake County / Johnston County line.
Developer: Regency Centers LLP
101 Maynard Crossing Center
Cary, NC 27513
Consultant: Chas H. Sells, INC.
15401 Weston Parkway, Suite 100
Cary, NC 27513
Phone [phone]
General Information:
The total acreage of the project is 13.9 acres, located within the Cleveland Water
District. There are 3 vacant dwellings that exist on the property along NC 42. The
majority of the site was timbered approximately 7 years ago, so there is a
substantial amount of undergrowth present within the property. Wetland
vegetation exists on the western most corner of the project. The drainage is not
considered an intermittent stream but a wetland in this area. All necessary Corp
of Engineers and Division of Water Quality permits will be obtained for the placing
of fill for the project,
The project is not within the Environmentally Sensitive Overlay District.
Impervious Area:
Within the 100' of right-of-way, approximately 600' of pavement widening of NC 42
from 2 lanes to 3 lanes, and 400' of widening for NC 50 is required. The
pavement widening will not be curbed and gutter, but have grassed swales. The
site has been previously approved for a shopping center.
Based upon the stormwater manual, the allowable impervious area for Non-
Residential Outside of the ESOD is 60% with BMP's. Impervious area is 9.51
Acres of the 13.9 acres or 68.4%.
Land Dedication will be required unless the owner acquires an additional two
acres of land to get the impervious area to 60%. The required area for Land
Dedication is 8.4% x 13.9 acres = 1.16 x 1.5 factor = 1.75 acres. The owner is
proposing 1.0 acres of wetland acquisition in the NCEEP as part of the project for
wetland mitigation. The remaining 0.75 acres will be part of the Land Dedication
to Johnston County.

Land has not been identified at this time for the land dedication program. The
developers will work with the County to either identify land or will pay the land
dedication program per acre payment of $10,000.
Peak Runoff Reduction:
The pre condition has a Q(1) of 8.36 cfs, and the post condition is 1 cfs after being
routed through the constructed wetland. The Q(10) pre is 13.7 cfs, and the Q(10)
post is 6 cfs.
Nitrogen Loading -See Next Sheet
Existing Drainage ways
The project is located at the top of a ridge at the intersection of NC 42 and NC 50.
The drainage area drains into an intermittent stream that begins south of the
southwest property line. Eventually the basin drains into Buffalo Creek.
There is one culvert crossing at NC 42 draining into the project limits. The
drainage basin for the existing 18" culvert pipe is 18 acres.

NITROGEN EXPORT CALCULATIONS
PROJECT: Middle Creek Commons
CHS No: 06-4013
Date: October 4, 2006
Impervious Area 9.5 Acres / 14 Acres = 67.8%
BASIN 1

Nitrogen Export - Method 2
AREA TN
EXPORT
COEFF. TN
EXPORT
Ibs/ r
PERMANENTLY PROTECTED/UNDISTURBED AREAS: 2.00 0.6 1.20
PERMANENTLY PROTECTED/MANAGED OPEN SPACE: 2.50 1.2 3.00
IMPERVIOUS SURFACES (ROOF, ROADS, PARKING) 9.50 21.2 201.40
TOTAL AREA: 14.00 205.60
TOTAL LOADING RATE (LB/AC/YR): 14.69
Bfi~P REDUCTION % (i~iIETLANDS}: 40%
BMP REDUCTION % (LEVEL SPREADER): 20%
BMP REDUCTION % (RIPARIAN BUFFER): 30%
NITROGEN LOADING RATE: 4.93
OFFSET PAYI'viEPv T CALCULATi06•iS
(4.93 - 3.6) LBS /ACRE * 14 ACRES = 18.62 Ibs /year

PROJECT: Middle Creek Commons
Pre and Post Development Flows
Pre-Development Flows Post-Development Flows Flow Out
Drainage
Basin # Area
(ac) I (10)
(in/hr) C-value Q(10)
(cfs) C-value Q(10)
(cfs) of BMP
(cfs)
1 9.50 6.03 0.25 14.32 0.8 45.82 5.99
Pre-Development Flows Post-Development Flows Flow Out
Drainage
Basin # Area
(ac) I (1yr, 10min)
(in/hr) C-value Q(1)
(cfs) C-value Q(1)
(cfs) of BMP
(cfs)
1 9.50 3.71 0.25 8.82 0.8 28.23 1
Wetiandandnitrogen.xlsPreDevelopment Chas. H. Sells, Inc. 10/4/2006

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PROJECT: Middle Creek Commons
BMP#1 Wetland
26-Sep-06
DETERMINE SURFACE AREAAND VOLUME REQUIRED
DRAINAGE AREA (DA):
SUBDIVISION LOT SIZE:
IMPERVIOUS AREA:
80%
SA/DA (FROM TABLE 1.1 NC BMP MANUAL): 3.36
SURFACE AREA REQUIRED: 13,904 SF
RUNOFF VOLUME(Rv) _ .05+(.009*%IMP.*100): 0.77 IN/IN
VOLUME REQUIRED (V) = Rv*1"*DA 26,543 CF
POND DEPTH CRITERIA:
HIGH MARSH (0-9" DEPTH) MIN .35% OF SA 4,867 SF
LOW MARSH (9-18" DEPTH) MIN. 35% OF SA 4,867 SF
OPEN WATER (> 18" DEPTH) MIN. 15% OF SA 2,086 SF
BALANCE OF AREA (15%): 2,086 SF
TOTAL SURFACE AREA: 13,904 SF
STAGE STORAGE TABLE
CONTOUR CONTOUR
AREA
SF INCR
VOLUME
CF ACCUM
VOLUME
CF Z
STAGE
FT % OF
NP
294 2,100 -2 15% >18"
295 9,000 -1 50% 9-18"
296 13,910 < -NORMAL POOL 0 35% 0-9"
297 15,301 14605 14,605 1 100%
298 17,042 16171 30,777 2
299 18,856 17949 48,725 3
9.50 ACRES
na ACRE
0
1
2
VOLUME CHECK (PROPOSED/REQUIRED): 1.16

STORAGE POOL DRAWDOWN
BMP#1 Wetland
ORFICE EQUATION: Q=CpA(2gh)~rz
Number of Drains:
Diameter of Drains:
Area of Opening:
Orifice Coefficient:
Average Head: (Q10 el - NP el)/2
Average Flow (Orifice Equation=
Volume of Storage =
1
2.0 in
0.0218 ft
0.60 ft
0.75 ft
0.091 cfs
26,543 cf
Length of Drawdown = 291,914 sec or 81.09 hours OK

Table of Contents Wetland modified10606.gpw
Hydraflow Hydrographs by Intelisolve Friday, Oct 6 2006, 10:22 AIJ~
Hydrograph Return Period Recap ...................................................................... 1
1 -Year
Summary Report ................................................................................................................. 2
Hydrograph Reports ........................................................................................................... 3
Hydrograph No. 1, Rational, Middle Creek-Wetland ......................................................... 3
Hydrograph No. 2, Reservoir, WETLAND ........................................................................ 4
Pond Report ................................................................................................................. 5
2 -Year
Summary Report ................................................................................................................. 6
Hydrograph Reports ........................................................................................................... 7
Hydrograph No. 1, Rational, Middle Creek-Wetland ......................................................... 7
Hydrograph No. 2, Reservoir, WETLAND ........................................................................ 8
Pond Report ................................................................................................................. 9
10 -Year
Summary Report ............................................................................................................... 10
Hydrograph Reports ......................................................................................................... 11
Hydrograph No. 1, Rational, Middle Creek-Wetland ....................................................... 11
Hydrograph No. 2, Reservoir, WETLAND ...................................................................... 12
Pond Report ............................................................................................................... 13
100 -Year
Summary Report ............................................................................................................... 14
Hydrograph Reports ......................................................................................................... 15
Hydrograph No. 1, Rational, Middle Creek-Wetland ....................................................... 15
Hydrograph No. 2, Reservoir, WETLAND ...................................................................... 16
Pond Report ............................................................................................................... 17

Hydrograph Return Period Recap
Hyd. Hydrograph Inflow Peak Outflow (cfs) Hydrograph
No. type
(origin) Hyd(s)
1-Yr
2-Yr
3-Yr
5-Yr
10-Yr
25-Yr
50-Yr
100-Yr description
1
2 Rational
Reservoir -------
1 28.17
0.81 34.94
3.14 -------
------- ------
------- 45.89
6.75 -------
------ -------
----- 63.47
9.21 Middle Creek-Wetland
WETLAND
Pr©j. file: Wetland modified 10 6 06.apv~ Friday, Qct 6 2006, 10:22 AM
Hydraflow Hydrographs by Intelisolve

Hydrograph Summary Report
Hyd.
No. Hydrograph
type
(origin) Peak
flow
(cfs) Time
inten+al
(min) Time to
peak
(min) Volume

(tuft) Inflow
hyd(s) Maximum
elevation
(ft) Maximum
storage
(tuft) Hydrograph
description
1 Rational 28.17 1 10 16,905 ---- ------ ------ Middle Creek-Wetland
2 Reservoir 0.81 1 20 6,132 1 297.13 16,730 WETLAND
I
i
~h~etEand rr~o~ifie~ 10 6 06.gp~,~ Kett ern Period: 1 Year Friday, Qct 6 2006, ~ 0:22 AM
Hydraflow Hydrographs by Intelisolve

3
l~ydragraph Plat
Hydraflow Hydrographs by fntelisolve
Hyd. No. '!
Middle Creek-Wetland
Hydrograph type =Rational
Storm frequency = 1 yrs
Drainage area = 9.500 ac
Intensity = 3.707 in/hr
IDF Curve = SampleFHA.idf
Friday, Oct 6 2006, 10:22 AM
Peak discharge = 28.17 cfs
Time interval = 1 min
Runoff coeff. = 0.8
Tc by User = 10.00 min
Asc/Rec limb fact = 1/1
Hydrograph Volume = 16,905 cult
P~6ddie %reek-"~tfetEasnd
Q (cfs) Hyd. No. 1 -- 1 Yr
30.00
25.00
20.00
15.00
10.00
5.00
0.00
0.0
Hyd No. 1
0.1
0.2
0.3
Q (cfs)
30.00
25.00
20.00
15.00
10.00
5.00
0.00
0.3
Time (hrs}

4
Nydragrap~ P~a~
Hydraflow Hydrographs by Intelisolve Friday, Oct 6 2006, 10:22 AM
Fljed. NO. 2
WETLAND
Hydrograph type =Reservoir Peak discharge = 0.81 cfs
Storm frequency = 1 yrs Time interval = 1 min
Inflow hyd. No. = 1 Max. Elevation = 297.13 ft
Reservoir name =Wetland Max. Storage = 16,730 cult
Storage Indication method used.
Q (cfs)
30.00
25.00
20.00
15.00
10.00
5.00
Q (cfs)
30.00
25.00
20.00
15.00
10.00
5.00
0.00 ~ ~``~ 0.00
0 5 10 15 19 24 29 34 39 44 48
Time (hrs)
--~- Hyd No. 2 Hyd No. 1
v~6ETL~'-E•i©
Hyd. No. 2 -- 1 Yr
Hydrograph Volume = 6,132 tuft

Pond Report
Hydraflow Hydrographs by Intelisolve Friday, Oct 6 2006, 10:22 AM
Pond No. 1 -Wetland
Pond Data
Pond storage is based on known contour areas. Average end area method used.
Stage /Storage Table
Stage (ft) Elevation (ft) Contour area (sgft) Incr. Storage (cult) Total storage (cult)
0.00 296.00 13,910 0 0
1.00 297.00 15,301 14,606 14,606
2.00 298.00 17,042 16,172 30,777
3.00 299.00 18,856 17,949 48,726
Culvert /Orifice Structu res Weir Structures
[Al LBl [C] LDl [Al [Bl [Cl [D]
Rise (in) = 18.00 1.00 0.00 0.00 Crest Len (ft) = 4.71 10.00 0.00 0.00
Span (in) = 18.00 1.00 0.00 0.00 Crest EI. (ft) = 297.00 298.00 0.00 0.00
No. Barrels = 1 1 0 0 Weir Coeff. = 3.33 3.33 0.00 0.00
Invert EI. (ft) = 295.50 296.00 0.00 0.00 Weir Type =Riser Rect --- ---
Length (ft) = 86.00 1.00 0.00 0.00 Multi-Stage =Yes Yes No No
Slope (%) = 0.50 1.00 0.00 0.00
N-Value = .013 .013 .000 .000
Orif. Coeff. = 0.60 0.60 0.00 0.00
Multi-Stage = n/a Yes No No Exfiltration = 0 .000 in/hr (Contour) Tailwater Elev. = 0.00 ft
Note: CulverUOrifce outflows have been analyzed under inlet and outlet control. Weir riser checked for orifice conditions.
Stage (ft)
3.00
2.00
1.00
0 00
Stage /Discharge
Stage (ft)
3.00
2.00
1.00
0 00
5
0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00
Discharge (cfs)
Total Q

H~rdrograph Summarlr Report
Hyd.
No. Hydrograph
type
(origin) Peak
flow
(cfs) Time
interval
(min) Time to
peak
(min) Volume

(cuff) Inflow
hyd(s) Maximum
elevation
(ft) Maximum
storage
(tuft) Hydrograph
description
1 Rational 34.94 1 10 20,964 ---- ------ ------ Middle Creek-Wetland
2 Reservoir 3.14 1 19 10,147 1 297.34 20,086 WETLAND
~hoetlar~d modified 10 6 06.gp~.~ RetLlrrl Period: 2 Year Fridey, Oct 6 2006, X0:22 AM
Hydraflow Hydrographs by Intelisolve

H~Odrograph Plat
Hydraflow Hydrographs by Intelisolve Friday, Oct 6 2006, 10:22 AM
Hyd. Flo. 1
Middle Creek-Wetland
Hydrograph type =Rational Peak discharge = 34.94 cfs
Storm frequency = 2 yrs Time interval = 1 min
Drainage area = 9.500 ac Runoff coeff. = 0.8
Intensity = 4.597 in/hr Tc by User = 10.00 min
IDF Curve = SampleFHA.idf Asc/Rec limb fact = 1/1
Hydrograph Volume = 20,964 tuft
i~idciie Creek v~etid~d
Q (cfs) Hyd. No. 1 -- 2 Yr
35.00
30.00
25.00
20.00
15.00
10.00
5.00
0.00
0.0
0.1
Hyd No. 1
0.2
0.3
Q (cfs)
35.00
30.00
25.00
20.00
15.00
10.00
5.00
0.00
0.3
Time (hrs)
7

l~yc~rograph Plot
Hydraflow Hydrographs by Intelisolve Friday, Oct 6 2006, 10:22 AM
Hyd. No. 2
W ETLAN D
Hydrograph type =Reservoir Peak discharge = 3.14 cfs
Storm frequency = 2 yrs Time interval = 1 min
Inflow hyd. No. = 1 Max. Elevation = 297.34 ft
Reservoir name =Wetland Max. Storage = 20,086 cult
Storage Indication method usede
Q (cfs
35.00
30.00
25.00
20.00
15.00
10.00
5.00
Q (cfs)
35.00
30.00
25.00
20.00
15.00
10.00
5.00
0.00 ' .~ _ _, _... .. ~ 0.00
0.0 0.3 0.7 1.0 1.3 1.7 2.0 2.3 2.7 3.0 3.3 3.7
Time (hrs)
---~--~ Hyd No. 2 Hyd No. 1
Hydrograph Volume = 10,147 cult
8

Pond Report
Hydraflow Hydrographs by Intelisolve Friday, Oct 6 2006, 10:22 AIU
Pond No. 1 -Wetland
Pond Data
Pond storage is based on known contour areas. Average end area method used.
Stage /Storage Table
Stage (ft) Elevation (ft) Contour area (sgft) Incr. Storage (tuft) Total storage (tuft)
0.00 296.00 13,910 0 0
1.00 297.00 15,301 14,606 14,606
2.00 298.00 17,042 16,172 30,777
3.00 299.00 18,856 17,949 48,726
Culvert /Orifice Structures Weir Structures
[A] [B] [C] [D] [A] [B] [C] [D]
Rise (in) = 18.00 1.00 0.00 0.00 Crest Len (ft) = 4.71 10.00 0.00 0.00
Span (in) = 18.00 1.00 0.00 0.00 Crest EI. (ft) = 297.00 298.00 0.00 0.00
No. Barrels = 1 1 0 0 Weir Coeff. = 3.33 3.33 0.00 0.00
Invert EI. (ft) = 295.50 296.00 0.00 0.00 Weir Type =Riser Rect -- ---
Length (ft) = 86.00 1.00 0.00 0.00 Multi-Stage =Yes Yes No No
Slope (%) = 0.50 1.00 0.00 0.00
N-Value = .013 .013 .000 .000
Orif. Coeff. = 0.60 0.60 0.00 0.00
Multi-Stage = n/a Yes No No Exfiltration = 0.000 in/hr (Contour) Tailwater Elev. = 0.00 ft
Note: Culvert/Orifice outflows have been analyzed under inlet and outlet control. Weir riser checked for orifce conditions
Stage (ft)
3.00
2.00
0 00
Stage /Discharge
1.00
Stage (ft)
3.00
2.00
1.00
0.00
0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00
Discharge (cfs)
--- Total O

9

10
Hydrograph Summary Report
Hyd.
No. Hydrograph
type
(origin) Peak
flow
(cfs) Time
interval
(min) Time to
peak
(min) Volume

(tuft) Inflow
hyd(s) Maximum
elevation
(ft) Maximum
storage
(tuft) Hydrograph
description
1 Rational 45.89 1 10 27,533 ---- ------ ------ fvliddle Creek-Wetland
2 Reservoir 6.75 1 19 16,695 1 297.64 24,978 WETLAND
\~,~etlarl~ modified 10 6 06.gp~~ R.etl~rln Periad: 10 Year Friday, Qct 6 2006, 10:22 AM
Hydraflow Hydrographs by Intelisolve

l~ydrograph Plot
Hydraflow Hydrographs by Intelisolve Friday, Oct 6 2006, 10:22 AM
Hyd. Flo. 1
Middle Creek-Wetland
Hydrograph type =Rational Peak discharge = 45.89 cfs
Storm frequency = 10 yrs Time interval = 1 min
Drainage area = 9.500 ac Runoff coeff. = 0.8
Intensity = 6.038 in/hr Tc by User = 10.00 min
IDF Curve = SampleFHA.idf Asc/Rec limb fact = 1/1
Hydrograph Volume = 27,533 cult
Q (cfs)
50.00
40.00
30.00
20.00
10.00
0.00 -
0.0
P~iddie Creek-~d'detiard
Hyd. No. 1 -- 10 Yr

``.,k
`'`
~.
°``.
_- ~
d
~ I
~ _ L'~
0.1
0.2
0.3
Q (cfs)
- 50.00
- 40.00
- 30.00
- 20.00
- 10.00
~- 0.00
0.3
Time (hrs)
11
Hyd No. 1

Hydrograph Plat
Hydraflow Hydrographs by Intelisolve Friday, Oct 6 2006, 10:22 AM
Hid. Ala. 2
WETLAND
Hydrograph type =Reservoir Peak discharge = 6.75 cfs
Storm frequency = 10 yrs Time interval = 1 min
Inflow hyd. No. = 1 Max. Elevation = 297.64 ft
Reservoir name =Wetland Max. Storage = 24,978 cult
Storage Indication method used.
Q (cfs
50.00
40.00
30.00
20.00
10.00
Hydrograph Volume = 16,695 tuft
V1f ~T~fi~I LAJ
} Hyd. No. 2 -- 10 Yr
t
r
Q (cfs)
50.00
40.00
30.00
20.00
10.00
0.00 __L._ _.w_ q .. ... _ 0.00
0.0 0.3 0.7 1.0 1.3 1.7 2.0 2.3 2.7 3.0 3.3
Time (hrs}
-~--~- Hyd No. 2 Hyd No. 1
12

Pond Report
1lydraflow Hydrographs by Intelisolve Friday, Oct 6 2006, 10:22 Alvl
Pond No. 1 -Wetland
Pond Data
Pond storage is based on known contour areas. Average end area method used.
Stage /Storage Table
Stage (ft) Elevation (ft) Contour area (sgft) Incr. Storage (tuft) Total storage (tuft)
0.00 296.00 13,910 0 0
1.00 297.00 15,301 14,606 14,606
2.00 298.00 17,042 16,172 30,777
3.00 299.00 18,856 17,949 48,726
Culvert /Orifice Structures Weir Structures
[A] [B] [C] [D] [A] [B] [C] [D]
12ise (in) = 18.00 1.00 0.00 0.00 Crest Len (ft) = 4.71 10.00 0.00 0.00
Span (in) = 18.00 1.00 0.00 0.00 Crest EI. (ft) = 297.00 298.00 0.00 0.00
No. Barrels = 1 1 0 0 Weir Coeff. = 3.33 3.33 0.00 0.00
Invert EI. (ft) = 295.50 296.00 0.00 0.00 Weir Type =Riser Rect --- --
Length (ft) = 86.00 1.00 0.00 0.00 Multi-Stage =Yes Yes No No
Slope (%) = 0.50 1.00 0.00 0.00
N-Value = .013 .013 .000 .000
Orif. Coeff. = 0.60 0.60 0.00 0.00
Multi-Stage = n/a Yes No No Ibzfiltration = 0.000 in/hr (Contour) Tailwater Elev. = 0.00 ft
Note: CulverUOrifice outflows have been analyzed under inlet and outlet control. Weir riser checked for orifice conditions.
Stage (ft)
3.00
2.00
1.00
0 00
Stage /Discharge
Stage (ft)
3.00
2.00
1.00
0.00
13
0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00
Discharge (cfs)
Total O

14
Hydrograph Summary Report
Hyd.
No. Hydrograph
type
(origin) Peak
flow
(cfs) Time
interval
(min) Time to
peak
(min) Volume

(tuft) Inflow
hyd(s) Maximum
elevation
(ft) Maximum
storage
(tuft) Hydrograph
description
1 Rational 63.47 1 10 38,084 ---- ------ ------ Middle Creek-Wetland
2 Reservoir 9.21 1 19 27,220 1 298.17 33,741 WETLAND
t/Vet(and modified 10 6 06.gp~ti~ RetLlrrl Period: 100 Year Friday, act 6 2006, 10:22 AM
Hydraflow Hydrographs by Intelisolve

15
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve Friday, Oct 6 2006, 10:22 AM

Middle Creek-Wetland
Hydrograph type =Rational Peak discharge = 63.47 cfs
Storm frequency = 100 yrs Time interval = 1 min
Drainage area = 9.500 ac Runoff coeff. = 0.8
Intensity = 8.352 in/hr Tc by User = 10.00 min
IDF Curve = SampleFHA.idf Asc/Rec limb fact = 1/1
Hydrograph Volume = 38,084 cult
iviiCidfe Creek=~'JetEarci
Q (cfs) Hyd. No. 1 -- 100 Yr
70.00
60.00
50.00
40.00
30.00
20.00
10.00
-.
I ,,
Q (cfs)
70.00
60.00
50.00
40.00
30.00
20.00
10.00

0.00 ' - - 0 00
0.0
0.1
Hyd No. 1
0.2
0.3
0.3
Time (hrs}

Flydrograph Plot
Hydraflow Hydrographs by Intelisolve Friday, Oct 6 2006, 10:22 AM

WETLAND
Hydrograph type =Reservoir Peak discharge = 9.21 cfs
Storm frequency = 100 yrs Time interval = 1 min
Inflow hyd. No. = 1 Max. Elevation = 298.17 ft
Reservoir name =Wetland Max. Storage = 33,741 cult
Storage Indication method used.
Q (cfs)
70.00
60.00
50.00
40.00
30.00
20.00
10.00
Hydrograph Volume = 27,220 cult
V~IEETLH`V Q
Hyd. No. 2 -- 100 Yr
Q (cfs)
70.00
60.00
50.00
40.00
30.00
20.00
10.00
0.00 t ,-....~....-..,....~~,. ,, i 0.00
0.0 0.3 0.7 1.0 1.3 1.7 2.0 2.3 2.7 3.0 3.3
Time (hrs)
Hyd No. 2 Hyd No. 1
^
~,
i
,,-
-
- -
~,
~~ ~

~

_

I
-
,,
__
~''
- ~, _

16

Pond Report
Hydraflow Hydrographs by Intelisolve Friday, Oct 6 2006, 10:22 AM
Pond No. 1 -Wetland
Pond Data
Pond storage is based on known contour areas. Average end area method used.
Stage /Storage Table
Stage (ft) Elevation (ft) Contour area (sgft) Incr. Storage (cult) Total storage (tuft)
0.00 296.00 13,910 0 0
1.00 297.00 15,301 14,606 14,606
2.00 298.00 17,042 16,172 30,777
3.00 299.00 18,856 17,949 48,726
Culvert /Orifice Structures Weir Structures
LAl [B] [C] IDl IA] IB] [C] IDl
Rise (in) = 18.00 1.00 0.00 0.00 Crest Len (ft) = 4.71 10.00 0.00 0.00
Span (in) = 18.00 1.00 0.00 0.00 Crest EI. (ft) = 297.00 298.00 0.00 0.00
No. Barrels = 1 1 0 0 Weir Coeff. = 3.33 3.33 0.00 0.00
Invert EI. (ft) = 295.50 296.00 0.00 0.00 Weir Type =Riser Rect --- ---
Length (ft) = 86.00 1.00 0.00 0.00 Multi-Stage =Yes Yes No No
Slope (%) = 0.50 1.00 0.00 0.00
N-Value = .013 .013 .000 .000
Orif. Coeff. = 0.60 0.60 0.00 0.00
Multi-Stage = n/a Yes No No Exfiltration = 0.000 in/hr (Contour) Tailwater Elev. = 0.00 ft
Note: CulverUOrifice outflows have been analyzed under inlet and outlet control. Weir riser checked for orifice conditions.
Stage (ft)
3.00
2.00
1.00
0 00
Stage /Discharge
Stage (ft)
3.00
2.00
1.00
0.00
17
0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00
Discharge (cfs)
Total O

,n W
p
Q m m
J H
V ~

N
W
Y Z ~ ~
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OPERATIONS AND ~iIIAINTENANCE fi~IANUAL
Project: kiddie Creek Commons
WATERSHED PROTECTION CONSTRUCTED WETLAND
JOHNSTON COUNTY, NC
Owners: Regency Centers LLP
101 f~aynard Crossings Center
Carp, NC 22513
Prepared B~: ®onald R. Sever, R.E., Chas H Sells, Inc.
Date: September 1, 2006
Pra~ect: BI~P Constructed Wetland
bate Constructed: Grading scheduled for Early 2007
Location: At the southwest corner of NC ~2 and NC 50 intersection in Johnston County,
North Carolina
Receiving Water Course: Branch to Buffalo Creek

E3PEE~/~T6OI~tS ~-f~® I~AEt~fTENAt~CE t~E~tr(U~i~
MIDDLE CREEK COMMONS STORMWATER CONSTRUCTED WETLAND AREA
This manual establishes procedures for maintenance and operation of the Middle Creep
Commons Constructed Wetland area (s) in accordance with the JOHNSTON COUNTY
guide{ones.
MAINTENANCE OF CONSTRUCTED ~~IETLAND AREAS
Vegetation-The drainage areas have a ground cover of wetland plantings outside of
the poi dd~ig area, ivhie:,! i if properly t E lalc{talk eed wall preVeilt er llsllln~ CJf tt le e9 d ~baifkt c 6lei Et
and provide an easy surface for inspection. The grass will be most difficult to obtain in
the area subject to ~~~ater level fluctuation, and has been planted above the inundated
areas. Grass should be fertilized every October and April. Wetland plants are located
~n~ithin all water lave! fluctuation areas. Check vegetation conditions ~~~ithin the
constructed ~a~etland area and replace if necessary any damaged plant materials
Re-Seeding-Periodic re-seeding may be required to establish grass on areas v~~here
seed did not take or have been destroyed. Before seeding, fertilizer (12-12-12) should
be applied at a minimum rate of 12 to 15 pounds per 1;000 SF. The seed should be
evenly sown at a rate of three pounds per 1,000 SF. The seed should be covered vvith
soil to the depth of approximately '/". Immediately folBowing the planting, the area
should be mulched ~~<ith stra~~~.
Trees and Shrubs-Trees, shrubs and other landscape vegetation should be permitted
only as shown on the approved planting plan. The vegetation should be kept healthy
and vibrant. If a tree or shrub dies it should be removed and replaced vvith another tree
QC Shrub fCOm the car~se c~ne~Pec (cee attached mair~terE?nce SGhedf ale).
I'~owing-Grass mowing, brush cutting and removal of ~r~~eed vegetation will be
necessary far the proper maintenance of the areas. All area slopes and vegetation
should be mo~a~ed when the grass exceeds 8" in height. Acceptable methods include
the use of weed whips or power brush cutters and mo~n~ers.
Erosion-Erosion occurs when the water concentrates causing failure of the vegetation
or when vegetation dies and sets up the environment for rill erosion and eventually
gullies from the stormvvater runoff. The areas should be inspected. Proper care of
vegetative areas that develop erasion is required to prevent more serious damage to
the site. Rills and gullies should be filled ~<<<ith suitGble soil compacted and then seeded.
Methods described earlier on vegetation should be used to properly establish the grass
surface. Where eroded areas are detected, the cause of the erosion should be
addressed to prevent a continued maintenance problem. Frequently, problems result

from the concentration of runoff to one point of the constructed wetland area instead of
a uniform distribution of runoff. This can be corrected by reshaping, to more evenly
distribute the runoff to areas not experiencing erosion problems.
Rodent Control-Generally in this urban environment, rodents are not a problem.
Rodents such as groundhogs, muskrats and moles are attracted to moist, wet areas
and can be quite dangerous to structural integrity and proper performance of the
earthwork and drainage. Groundhogs and muskrats thrive on burrowing into the
manmade earthwork, which become pathways for seepage. In the event that burrows
are detected within the constructed wetland area, the rodents should be dea{t with by
removal.
Trash and Debris--Trash acts as a barrier to stormwater infiltration and attracts
unwanted pests. The constructed wetland area should be kept clear of debris such as
loose bottles, cans, food containers and other forms of rubbish. The area should be
cleared of debris as needed, but no less than twice a year.
MAif~iTENAf~iCE OF SPILLWAYS Af~ID COf~'TROL STRUCTURE
Inspection of Conduits--Conduits should be inspected thoroughly once a year. Conduits
should be visually inspected at the joints. Pipes should be inspected for I,~roper
alignment (sagging), elongation and displacement at joints, cracks, leaks, surface wear,
loss of protective coating, corrosion and blocking. Problems ~n,~ith conduits most often
occur at joints and special attention should be given to them during inspection. Joints
should be checked for gaps caused by elongation or settlement and loss of joint filler
material. Open joints can permit erosion of the earthwork and possibly the piping of soil
material through the joints. A depression in the soil surface over the pipe may be signs
that sail is being removed from around the pipe.
~~F~t~T~~~~
Drainpipes--Drainpipes should always be operable so that the water can be dra~~m do~nm
in the. event of severe rain or for repairs or maintenance.
Record Keeping--Operation of constructed wetland area should include recording of the
follo~h~ing:
Annual inspection Reports--A collection of written inspection reports should be
kept on record in Section I\/ of this ma.nuai. Inspection should be conducted
annua[fy. Copies should be provided to the To~~m of JOH~[STOi~ COUNTY
Stormwater Management Section of the Engineering Department.
Observations--All observations should be recorded. Where periodic inspections
are performed follo~n~ing significant rainfall, these inspections should be logged
into the Periodic Inspection, Operations and Maintenance Form in Section IV of
this manual.
Maintenance--Written records of maintenance and/or repairs should be recorded
on the Periodic Inspection, Operation and Maintenance Form in Section IV of this
manual.

Other Operational Procedures--The owner should maintain a complete and up-to-date
set of plans (as-built drawings) and all changes made to the constructed wetland area
over time should be recorded on the as-builts.
Sedimentation and Dredging--Sedimentation from on-site and off-site soils will
eventual{y result in the clogging of drainage conduits and will have fio be removed. The
frequency of this sediment removal can be reduced by ensuring that the site areas
around the building be stabilized with a vegetative ground cover such that it restrains
erosion. This would include a periodic application of fertilizer and/or other treatment
necessary to promote a stable ground cover and minimize sedimentation to the pond.
The removed material should be hauled offsite to a suitable landfill site or mounded
same~~rhere on site and stabilized with a ground cover sufficient to restrain erosion.
Example Maintenance Schedule for constructed wetland Areas
€3escri~it~~n f-Cet€~c~e- Frequer~c Tert~e csf year
~~~~
Inspect and repair erosion Visual Monthly All rear
t~ ~..~s~~ I~ tom. tF'E t~.
Remulch any void area B hand As needed As needed
Remove previous mulch By hand Once every Spring
layer before applying new 2-3 years
layer optional
An additional mulch added By hand Once a ear Spring
[~i.A~tTS
Removal and replacement See planting T~~~ice a year As directed by
of a!I dead and diseased specifications landscaper
vegetation considered
beyond Treatment
Treat all diseased trees f~echanical N/A Varies, dependent
and shrubs or by hand on insect or disease
infestation
Removal of cattails and By hand or As needed As needed
other invasive species through hand
application of
herbicide
V~/atering of plant material By hand wily immediately after
shall take place at the end completion of project
of each day for fourteen
consecutive da}rs and after
lanting is completed
Replacement of support By hand Once a year Only remove stake
stakes in the spring
Replace an}r deficient B}r hand As needed As needed
stakes or wires
IV. ii~iSPECTION, OPERATION AND iVIAINTENANCE CHECKLiS I S

POND fNSPECTiON CHECKLIST
Date
Time
Biddle Creek Commons Constructed VVetfar~d Pond
JOHNSTON COUNTY, NC
INSPECTORS
SPILLWAYS s DRAINS s OUTLETS ACTION

HECK/CiRCLE
CONDITION NOTED

BSERVATIONS R
E
P
A
R
S M
0
N
I
o
R I
N
V
E
T
I
G
A
T
I
V
E
Principal Spillwa Type:
trashrack/debris
cracks/deterioration

improper alignment
cracks/deterioration
joint deterioration

seeps e/piping
Undercutting
Erosion
Debris

Lake Drain/Other Outlets T ape:
Gate/valves
Operability

GENEI~~"L COI`~~fJE[~TS, Sf~ETCI~ES ~ FFELD ~~EA.SURE~~~ENTS

PERIODIC INSPECTION, OPERATION Middle Creek Commons Constructed Wetland
AND MAINTENANCE RECORDS Pond
JOHNSTON COUNTY, NC
RECORDED
DATE TIf~~E RAIN POOL WEATHER GENERAL OBSERVATIONS OR COf~MENTS BY
LEVEL CONDITIONS
DATE MAINTENANCE PERFORC!/IED COMMENTS RECORDED
BY
DATE EQUIPEMENT OPERATED COMMENTS BYCORDED
POND INSPECTION CHECKLIST
Date
Time

Middle Creek Commons Constructed Wetland Pond
JOHNSTON COUNTY, NC
iNSPECTORS
EMBANKMENT • POOL ACTION

HECK/CIRCLE
CONDITION NOTED

BSERVATIONS R
E
P
A
I
R
s f~
O
N
I
T
o
R I
V
E
S
T
I
A
T
I
v
E
U/S SLOPE
vegetation/n rap
beachin /slides/cracks
undermining/erosion
rodent burrows

CREST
ruts/erosion
cracks/settlement __~~
oor aiignn~ent __ _~

D/S SLOPE
ve etation/erosion
rodent burrows
slough/slides/cracks
seepage/wetness

POOL
erosion/ground cover
sedimentation
water ualit

ABUTMENT
ve etation/erosion
slough/slides/cracks
seepa e/wetness

CEhERAL COlL~fMENTS, SKETCHES & FIELD MEASUREME~!TS

OPERATIONS AND MAINTENANCE MANUAL
STORMWRTER CONTROL STRUCTURE LEVEL SPRERDER
JOHRSTON COUR~TY, RAC
Project: Middle Creek Commons
O~~ners: Regency Centers LLP
101 Maynard Crossings Center
Cary, NC 27513
Prepared ~y: Donald ~. Sever, P.E., Chas H Sells, Inc.
Date: September 1, 2000
Project: BMP Constructed Wetland
Date Constructed: Grading scheduled for Early 2007
Location: At the south~~vest corner of f~C ~2 and NC 50 intersection in Johnston County,
North Carolina
Receiving l~~ater Course: Branch to Buffalo Creek

OPERATIQNS & MAINTENANCE MANUAL
(Project Name}: LEVEL SPREADER
This manual established procedures for maintenance and operation of the LEVEL
SPREADER in accordance with the Johnston County Stormwater guidelines.
Maintenance of level spreader
A. Vegetation -Sod shall be used for the instillation of the level spreader
(fescue). The level spreader shall be properly maintained to ensure an
adequate ground cove of fescue, which if properly maintained will prevent
erosion. Fertilizer rates should be kept to a minimum.
~ Re-Seeding -periodically re-seeding may be required to establish grass
on areas where seek did not take or has been destroyed. Before seeding,
fertilizer (12-12-12) should be applied at a minimum rate of 12 to 15
pounds per 1,000 SF. The seed should be evenly sewn at a rate of three
pounds per 1,000 SF. The seed should be covered with soil to the depth
of approximately '/". Immediately following the planting, the area should
be mulched with stra~e~~.
~ Trees & Shrubs -trees, shrubs, and other landscape vegetation sha!! not
be permitted with the level spreader. Periodic inspections and
maintenance shall be performed to remove intrusive vegetation.
~ Mowing -grass mowing, removal of weed vegetation will be necessary far
the proper maintenance of the level spreader. A level spreader should be
mo~n,~ed ~nrhen the grass exceeds ~" in height (maximum ~"}. Acceptable
methods include the use of weed whips or power brush cutters and
mowers.
B. Erosion -Erosion occurs ~n~hen the water concentrates causing failure of the
vegetation or when vegetation dies and sets up the environment far rill
erosion and eventually gu{{ies from the stormwater runoff. The level spreader
should be inspected erosion forE~~ occurriE~g. Proper care of vegetative areas
that develop erosion is required to prevent more serious damage to the
Stormwater Best Management Practice (BLl/IP). Rills and gr~Ilies should be
filled v~rith suitable soi6 compacted and then seeded. I~~ethods described
earlier on vegetation should be used to properly establish the grass surface.
Where eroded areas are detected, the cause of the erosion should be
addressed to prevent a continued maintenance problem. Frequently
problems result from the concentration of runoff to one point of the level
spreader instead of a uniform distribution of runoff. This can be corrected by
reshaping fhe level spreader to more evenly distribute the runoff to areas,
which are not experiencing erosion problems.

C. Rodent Control
Generally in this urban environment, rodents are not a problem. Rodents
such as ground hogs, muskrats, and beavers are attracted to dams and
reservoirs and can be quite dangerous to structural integrity and proper
performance of the embankment and spi(Eway. Groundhog and muskrats
thrive on burro~a~ing in the manmade earth earthwork, which become
pathways for seepage. In the event that burrows are detected within the level
spreader, then the rodents should be dealt with by removal.
Trash and Debris -Trash acts as a barrier to stormwater flow and attracts
unwanted pests. The level spreader and downstream storm inlet should be
kept clear of debris such as loose bottles, cans, food containers and other
forms of rubbish. The area should be kept clear of debris as directed in the
maintenance agreement.
II. OPERATION
~ 1~ 1 1,.,, ,.~ IJ 1........, 4. 1:~.-..I 11~. ..11
LCVeI spreaf.ECr - Ehe ICVCI spreader st~lot,ElU aEWdy~ UC llperaClU! EaE 5C1 !E Ecil ~ le
water is distributed evenly across the width of the level spreader and flows
the entire Length of the bevel spreader. Any obstruction that prevents even
destitution of the stormv-~ater flow within the level spreader shall be removed
and any signs of erosion shall be repaired immediately after obser~~ed.
A. Record Keeping
Operation of a level spreader should include recording of the following:
Annual Inspection Reports - a collection of written inspection reports
should be kept on record in Section IV of this manual. inspection should
be conducted annually. Copies should be provided to the .lohnston
County Environmental Protection Administrator.
d Observations - a[I observations should be recorded. VVhere periodic
inspections are performed following significant rainfall events, these
inspections should be logged into the Periodic Inspection, Operation &
6~air~tenance farm.
~/laintenance -written records of maintenance and/or rEpairs should be
recorded on the Periodic Inspection, Operation ~: ~~aintenance dorm.
Other Operation Procedures -the ovrner should maintain a complete and
up-to-date set of plans (as-built drawings) and ail changes made to the
level spreader over time should be recorded on the as-bunts.

LEVEL SPREAE~ER [~tSPECTE~E~E CFEECKLEST
date:
Time:
Niiddie Creek Commons Levei Spreader
Date Observations Action - Action - Action --
Re air Monitor Investi ative
C~e~~r~i C~r~i~~r~~~, ~E~~~c~~~ ~. F~e~c~ e~~ur~m~rt~s

MIDDLE CREEK COMMONS, JOHNSTON COUNTY, NC
LEVEL SPREADER OPERATION AND MAINTENANCE AGREEMENT
The level spreader is defined as an elongated, level threshold, designed to diffuse stormwater runoff.
Maintenance activities shall be performed as follows:
1. After construction and until vegetation has been established, level spreader(s) shall be inspected after
every rainfall. Thereafter, level spreader(s) shall be inspected at least every month and more
frequently during the fall season and after heavy rainfall events:
a. Accumulated sediment, leaves, and trash shall be removed, and repairs made if required.
b. Inspect level spreader(s) for evidence of scour, undercutting, settlement of the structure, and
concentrated flows downhill from the level spreader(s).
c. A level elevation shall be maintained across the entire flow-spreading structure at all times.
Repair or replace the level spreader if it is damaged.
d. Mow vegetative cover to a height of six (6) inches and prune plants if they cover over half of the
level spreader surface.
e. Repair eroded areas and replace/replant dead or damaged vegetation.
2. The contractor should avoid the placement of any material on and prevent construction traffic across
the structure. If the measure is damaged by construction traffic, it shall be repaired immediately.
3. Inspect and repair the collection system (e.g., catch basins, pipes; swales, riprap) four (4) times a year
to maintain proper functioning.
I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance
procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to
the system or responsible party. /~
Print name: (, i2'i S ~~rr~ i~//-1 /Erg' n~? .77'~Ni~.~r ,~~-~~C/-~z:~~ C!-iJTL-~ s
Title: ~/~ ~~ ?~~_ ~ i r~~ ;
E~
Address: i6 / /~(~t ~,r ~ ~ r~ / °-rr.~_ss ~,~~ c~ C ,4r~,~f X'C~, ,~ ~.5 l-~
Phone
Signati

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, "~ , a Notary Public for the State of
County of f/1 ~-~ ~~CY , do hereby certify that ~~ I~ S VI/id (M ~ 2-Z
personally appeared before me this ~ ~ day of bL~Tp I~rrr'~ 7,~bl.0 ,and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. l~litness my hand and
official seal,
~~~~t~t~t~c~sa~~~i
~4t~~ ~ ;~ ' ° • ®~/ iii
/y~ G'-~/`'.
ti"cR!! :l
-.., t I~O 6t17F L
L ~` '~ * ~
i I~UHtIC `~
l ~ t . ~~.
'.'- lei t • •c;_
SEAL
~~~~~
My commission expires 5 ~ Z ~ ~7
Page I of ]

MIDDLE CREEK COMMONS, JOHNSTON COUNTY, NC
WETLAND DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
This is the Operation and Maintenance plan for the wetland detention basin system at Middle Creek Commons
in the Cleveland Community, Johnston County, NC.
Maintenance activities shall be performed as follows:
Inspection Frequency
The treatment device and its structural components, to include the sediment forebays, shall be inspected
after every significant runoff producing rainfall event (roughly 0.5 inches of rainfall) and at least semi-
annually. Inspections shall be performed by persons of sufficient background and understanding of the
structure and its intended purpose.
2. Generallnspection
General inspection activities for the Extended Detention Storm Water Wetland shall
include:
a) Inspection for trash accumulation, vegetative cover including wetland plant species, and general
condition. Litter and debris shall be removed from wetland, sediment forebays, riser trash rack and the
riser drawdown orifice.
b) Check and clear drawdown orifice of any obstructions such that the drawdown of the temporary pool
occurs as intended by the design.
c) Inspect contributing storm water collection system (ie. piping, swales, riprap, etc.) for condition and
proper function.
d) Inspect sediment forebays and storm water wetland for sediment accumulations at a minimum of every
six months and after each runoff producing rainfall event. The depth of sediment within the forebays
and wetland shall be measured during each inspection. Inspect and repair the collection system (i.e.
catch basins, piping, swales, riprap, etc.) quarterly to maintain proper functioning.
3. Structurallnspection
Structural inspections of the Extended Detention Storm Water Wetland shall include the following:
a) Inspect for erosion at the forebay inlet stabilization and outflow weir, and outlet protection apron (at
flared-end sections and natural channel inlets). Identify any deficiencies with the installed method of
stabilization to include displacement of riprap or geotextile fabric.
b) Inspect the sediment forebay and weir for function and condition (including depth of sediment).
c) Inspect for erosion along the wetland perimeter and dam embankment. Inspect perimeter slopes for
cracking or settling, slope stability, ground cover, the presence of undesirable or nuisance vegetation.
d) Inspect wetland spillway structures, including but not limited to, the riser, trash rack, barrel, outlet
flared-end section, drawdown orifice, and low-level outlet for general condition, deterioration, and
proper operation. Inspect structure for evidence of cracks or leakage in structure. Maintenance (low-
level) outlet valve shall be checked for complete function during each inspection. The valve shall be
moved to the full open position for a brief period during each inspection.
e) Inspect the embankment for evidence of seepage along the downstream embankment face to include
the vicinity of the outlet flared-end section.
Page 1 of 3

4. Maintenance and Repairs
Maintenance and repair activities shall include:
a) Repair eroded areas to include embankment or perimeter slopes immediately, reseed as necessary to
maintain good vegetative cover. Mow embankment cover to maintain maximum height of six inches,
remove unwanted woody vegetation as needed.
b) Make repairs to contributing storm water collection system to maintain proper function.
c) Remove accumulated sediment and debris from wetlands and basin as required described below:
Forebays -Sediment within the forebay shall be removed when the depth of sediment reaches one-half of
the forebay depth at the invert. The measuring device used to determine the sediment elevation shall be
such that it will give an accurate depth reading.
Storm Water Wetland - If the elevation of the marsh area exceeds the permanent pool elevation by more
than 12 inches (other than as designed), the wetland shall be regraded to design levels (0" to 12" above
permanent pool). This shall be performed by removing the upper 6 inches of soil and stockpiling it. Then
the marsh area shall be excavated to the permanent pool elevation. Afterwards the stockpiled soil should
be spread over the marsh surface such that its elevation ranges between 0" and 6" above the permanent
pool. The soil should not be stockpiled for more than two weeks. Replant wetland surface as described in
construction drawings.
NOTE: Removed sediment from any device shall be disposed of in an appropriate manner (in accordance
with local, state, and federal regulations) and shall be handled in a manner that will not adversely impact
water quality.
d) Remove cattails and other indigenous wetland plants when they cover 25% of the wetland surface.
These plants may be encouraged to grow along the edge of the wetland and the forebay berm as long
as they do not interfere with hydraulic function or out-compete desired (see planting plan) plant
species.
e) Wetland plant densities and species shall be maintained and re-planted in bare areas as needed.
Water newly planted species at a rate of not less than 1-inch per week (including rainfall) for a period
of 90 days after planting.
f) Water entire storm water wetland planted area as necessary during periods of drought to ensure plant
health and vegetation density.
g) If the wetland must be drained for an emergency or for maintenance purposes, the flushing of
sediment through the emergency drain shall be minimized to the maximum extent practical.
It shall be the responsibility of the Owner to schedule the repair of any deficiencies noted during an
inspection.
A permanent maintenance and inspection easement will be granted to NCDENR -Division of Water
Quality (DWQ) and maintained by the Owner to provide access to the storm water wetlands. It will be the
responsibility of the Owner to secure the appropriate agreements with future owners should the property
be subdivided or sold. Inspections and maintenance (routine or otherwise) and their scheduling will be the
responsibility of the Owner.
Page 2 of 3

I acknowledge and agree by my signature below that I am responsible for the performance of the seven
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.
,/' ~-E»
Print name: ~ ~=~~= r~ ~~~f a"3,~~~F ~~- ~ ~ 1~"° .~c== ~~~i ~t° ~'` i ~ ~ ~r~.~~' ;~ ~=~., ~~,~-,C
Title: \,,~~~ ~ ~ 1 F~~~~ i ~a c`,~ "--~-
Address: i~ / /°'~~~-rr~ ~-x--t~ ~~.~ ~z a ~ ,~.F ~° ~~- f-t-t2 >/ ~ ~~ ~ `% f~..~
-~ ---~
Phon
Sign
Date:
1, ~~~~ ~v l bti i UJOI,~~c~,~ , a Notary Public for the State of t!~ ,
County of ~U~fvi~ t , do hereby certify that~61 fZIS 1l1/i(~t~l~'1G1~.~~.I'U
personally appeared before me this ~ ~ day of UC TD b~~2 ~~~ ,and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. 1Nitness my hand and
official seal,
l~~~Itllf It!/>~~~,
y\~E ,~ ~R, ,, t~S ~®0~ ~~~~
®.' •.~
(VOTARY
,t ,t ,t -
"' PUBLIC
:,~ ~'o
~G. .'V`
~~~~Q~~! COUN~~~~~`
-, _
SEAL
My commission expires 5~ 2. ~ Zn°~
Page 3 of 3

DWQ Project No.
DNISION OF WATER QUALITY •401 EXTENDED DETENTION (and POCKET*) WETLAND WORKSHEET
I. PROJECT INFORMATION (please
Project Name
Contact Person:
the following information):
t..~ C/L ~~. C.~M oft S
Phone Number. (~1 f4l ~ ? ~ '~ `? °_
For projects with multiple basins, specify which basin this worksheet applies to:
Permanent Pool Elevation ~.~ ~ ft. (elevation of the orifice invert out)
Temporary Pool Elevation 2 4S• ft. (elevation of the outlet structure invert in)
Permanent Pool Surface Area (3 ~l o'~ sq. ft. (water surface area at permanent pool elevation)
Drainage Area R. > ac. (on-site and off-site drainage to the basin)
Impervious Area ?. to ac. (on-site and off-site drainage to the basin)
Forebay Surface Area 20 $ ~ sq. ft. (at permanent pool elevation approximately 15%)*
Marsh 0"-9" Surface Area 4 86 ~ sq. ft. (at permanent pool elevation approximately 35°~)*
Marsh 9°-18" Surface Area ~ ~~ b 7 sq. ft. (at permanent pool elevation approximately 35°~)*
Micro Pool Surface Area 2~ t~ ~ sq. ft. (at permanent pool elevation approximately 15%)*
Temporary Pool Volume ~~ 5 ~ 3 cu. ft. (volume detained on top of the permanent pool)

SA/DA used 3.3 V (surface area to drainage area ratio)*
Diameter of Orifice 2 1 l°' in. (draw down orifice diameter)
II. REQUIRED ITEMS CHECKLIST
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. At a minimum, a complete stormwater management plan submittal includes
a worksheet for each BMP, design calculations, plans and speclfications showing all BMPs and outlet structure details, a detailed
drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request far
additional information and will substantially delay final review and approval of the project
Applicants Initials
~qs The temporary pool controls runoff from the 1 inch rain.
`~i The basin side slopes are no steeper than 3:1.
7ra'S A planting plan for the marsh areas with plant spedes and densities is provided.
Pt3 Vegetation above the permanent pool elevation is specified.
~ An emergency drain is provided to drain the basin.
ie temporary pool draws down in 2 to 5 days.
;diment storage is provided in the permanent pool.
sediment disposal area is provided.
:cess is provided for maintenance.
~ A site specific, signed and notarized operation and maintenance agreement is provided.
t The drainage area (including any offsite area) is delineated on a site plan.
Access is provided for maintenance.
~R3 Plan details for the wetland are provided.
'~ S Plan details for the inlet and outlet are provided.
~ A site specific operation and maintenance agreement, signed and notarized by the responsible party is provided (see
http:l/h2o.ehnr.state. nc.us/ncwetlands/oandm.doc).
* Pocket Wetlands have different design parameters and are only assumed to remove 35% TSS -See pp.19and 20 of the NC DENR
Stormwater BMP Manual, April 1999. 10°~ open water, 50% high marsh, 40% low marsh.

DWQ Project No.
DIVISION OF WATER QUALITY • LEVEL SPREADER WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name: M ~~~C:E- Cam-- Cdi'vl/3'Jun~S
Contact Person: any r+~.D S~ll~n-- , E. Phone Number. f 9 ~ 11 L T ~ 6u 3
Level Spreader ID:. .
Level Spreader Length 2- ° ft. (perpendicular to flow)
Drainage Area 9. s
- ac. (on-site and off-site drainage to the level spreader)
Impervious Area ~~ ac. (on-site and off-site drainage to the level spreader)
Maximum Filter StriplBuffer Slope ! % (6°~ for forested, leaf littler cover, 8°~ for thick ground cover)'
grass
Max. Discharge from a 10 Year Storm ~• `! cfs
Max. Discharge to Level Spreader cfs
Filter Strip/Buffer Vegetation ~adG ,, Gd,,,Y (thick ground cover or grass, canopied forest with leaf litter
groundcover)
Pre-treatment or Bypass Method C,rtNSTr/~firl (~L71r~.~,{
II. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. ffa
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal incudes
a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed
drainage plan 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.
licants Initials
Level spreader is at least 13 ft. per cfs for thick ground cover or grass or 100 ft per cfs in canopied forest with leaf
litter.
^j Pre-Form Scour Holes are on flat slopes only
r No structures are located in protected buffers*
If bypass method specified in the Draft Level Spreader Design Option Document:
J ~ Bypass method is spedfied (if applicable) and plan details and calculations are provided
't7~S Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the bypass
discharge.
'DA'S No structures are located in protected buffers.
Ash Plan details for the bypass and outlets are provided.
~~!'I The operation and maintenance agreement includes annual erosion and vegetation repair.
i)tYt The operation and maintenance agreement signed and notarized by the responsible party is provided.
* Level spreaders. in series can be used on slopes of up to 15°~ in forested areas with leaf littler cover or on slopes of up to 25°k in areas
with thick ground cover or grass 'rf designed acxording to the Draft Level Spreader Design Option Document. This potentially requires a
minor variance in protected buffer areas. In any event the second level spreader cannot be located in Zone 1 of a protected buffer area.