20050736 Ver 1_More Info Received_20060331

05-off 3(0
Soil & Environmental Consultants, PA
11010 Raven Ridge Road • Raleigh, North Carolina 27614 Phone: [phone] • Fax: [phone]
www.SandEC.com
March 31, 2006
S&EC Project # 2932.w2
To: US Army Corps of Engineers
Raleigh Regulatory Field Office
Attn: Todd Tugwell
6508 Falls of the Neuse Road, Suite 120
Raleigh, North Carolina 27615
N.C. Division of Water Quality
401 Oversight and Express Permits Unit
Attn: Cyndi Karoly
2321 Crabtree Boulevard, Suite 250
Raleigh, NC 27604-2260
N.C. Division of Water Quality
Raleigh Regional Office
Attn: Eric Kulz
3800 Barrett Drive
Raleigh, NC 27609
From: Bob Zarzecki
Soil & Environmental Consultants, P.A.
11010 Raven Ridge Road
Raleigh, NC 27614
N.C. Division of Water Quality
NPS Assistance & Compliance Oversight
Attn: Danny Smith
512 N. Salisbury St.
Raleigh, NC 27604
Re: Heritage Pines Subdivision, Cary, NC - Individual Permit Application
Stormwater Management Plans
Condition 3, Individual Water Quality Certification (02-07-06)
Dear Ms. Karoly:
On behalf of our client, Heritage Pines LLC, we are hereby providing additional information to comply
with Condition No. 3 of the Individual Water Quality Certification No. 3560 issued on February 7, 2006.
We believe that this information satisfies the requirements of Condition 3. Please let us know if there is
any additional information that you require. Our client is eager to secure written approval of these plans
from you office.
KWWMVN 19 1 SFP/11.:M
Al!'3Nno 4,91VIA • ltne Sincerely,
fli ? ?jj a c--
Bob Zarzecki,
Environmental Specialist
Soil & Environmental Consultants, PA
Cc: Mark Miller (K. Hovnanian Homes)
Brad Haertling (Hugh J. Gilleece & Associates)
i
Charlotte Office: Greensboro Office:
236 LePhillip Court, Suite C 3817-E Laundale Drive
Concord, NC 28025 Greensboro, NC 27455
Phone: [phone] Phone: [phone]
Fax: [phone] Fax: [phone]
Heritage Pines Subdivision
Pipe Outlets and Flows
Outlet
A Phase
1* Former Number
38A 10 cfs
9.10 Device in Place/ Proposed Im rovements
Discharge directly to pond/no buffer Pi a Diameter
15"RCP
B 1 * 37 2.89 Discharge directly to pond/no buffer 15" RCP
C 1* 3F 11.05 Discharge directly to pond/no buffer 24" RCP
D 1 * 1 2.53 Discharge directly to pond/no buffer 15" RCP
E 1 * 18A 3.06 Scour hole 15" RCP
F 1* 16B 1.31 Scour hole 15" RCP
G 1* 28 58.92 Ri -rap culvert under Crystal Brook 24" CMP
H 1* 27A 3.41 Convert to pocket wetland 24" RCP
I 2 3A 42.55 Rip- a/Mostly school run off (Weir) 30" RCP
J 2B 8 4.07 Sheet flow achieved 15" RCP
K 2 20 45.10 Rip-rap 24" RCP
KK 1 * 41 2.31 Included in "r' payment 15" RCP
L 3 27 8.69 Sheet flow achieved 24" RCP
M 3 31A 9.75 Sheet flow achieved 24" RCP
N 3 34A 9.01 Sheet flow achieved 24" RCP
O 3 36 1.60 Convert to levels reader 15" RCP
P 3 39 9.05 Convert to levels reader 24" RCP
Q 3 42C 12.05 24" RCP
R 4 80 1.18 Scour hole 15" RCP
RR 4 A1/B1 340 Rip-rap culvert under road Arch Bridge
S 4 71 44.45 Wet and followed b levels reader 24" RCP
T 4 75 3.49 Convert to level spreader 15" RCP
U 4 78 7.12 Scour hole 18" RCP
V 4/1 S 47 128.79 Bypass/Small portion of Louis Stephens
------
W 5/LS 56 7.00 Not Heritage Pines 24" RCP
X LS 53A 7.11 Not Heritage Pines 18" RCP
Y 5 99A 6.65 Offset with "5" treatment of phase 4 24" RCP
* Flows for outlets in phase 1 are calculated from sketchy and incomplete data and may not be
accurate.
DWQ Project No.
DIVISION OF WATER QUALITY - LEVEL SPREADER WORKSHEET
1. PROJECT INFORMATION (please complete the following Information):
Project Name : Heritage Pines Subdivision
Contact Person: Penton N. Joyner P.E. Phone Number. [9191469-1101
Level Spreader ID: Q
Level Spreader Length it 23
Drainage Area ac. 2.65
Impervious Area ac. 1.10
Maximum Filter StriplBuffer Slope 8 %
Grass
Max Discharge from a 10 Year Storm 12.05 cis
Max. Discharge to Level Spreader 1.74 cis
Filter Strip/Buffer Vegetation Grass
Pre-treatment or Bypass Method Solitter Box
11. REQUIRED ITEMS CHECKLIST
(perpendicular to flow)
(On-site and off-site drainage to the level spreader)
(on-site and off-site drainage to the level spreader)
(6% for forested, leaf littler cover, 8% for thick ground cover)'
(thick ground cover or grass, canopied forest with leaf litter
groundcover)
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 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
Applicants IgItials
L14 4 Level spreader is at least 13 ft per cis for thick ground cover or grass or 100 ft per cis in canopied forest with leaf
litter.
N/A Pre-Form Scour Holes are on flat slopes only
No structures are located in protected buffers*
If bypass method specified in the Draft Level Spreader Design Option Document:
Bypass method is specified (if applicable) and plan details and calculations are provided
Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the bypass
discharge.
1449 No structures are located In protected buffers.
Plan details for the bypass and outlets are provided.
The operation and maintenance agreement includes annual erosion and vegetation repair.
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% in areas
with thick ground cover or grass if designed according 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.
F:Vobs\l 700\Hcritage PineMOvcrall Wctlands\Documcnts\Worksiicct O&M\LS WORKSHEET - Outlet Q.doc
Heritage Pines Subdivision
Outlet Q Splitter Box
This outlet will be fitted with a splitter box to direct the water quality flow to a level
spreader while passing higher flows to a normal outlet.
Drainage area = 115,454 s. f. = 2.65 ac. Impervious area = 47,983 s. f. =1.10 ac.
I = 47,983/115,454 = 0.4156 (41.56%)
R„ = 0.05 + 0.009(41.56) = 0.424
Qa = 1 "(0.424) = 0.424 watershed inches
WQ„ _ [1"(0.424)(2.65 ac.)]/12 in./ft. x 43,560 s. f./ac. = 4079 c. f.
CN = 1000/110 + 5(1 ") + 10(0.424) -10[(0.424)' + 1.25(0.424)(1 92.5
to = 6 min.
Ia = (200/92.5) - 2 = 0.162
I;1/P = 0.162/1" = 0.162
q„ = 990 csm/in. From TR 55 Table 4-II
A = 2.65 ac./ 640 ac./sq. mi. = 0.00414 sq. mi.
Qp = (990 esm/in.)(0.00414 sq. mi.)(0.424 in.) = 1.74 cfs (flow to level spreader)
Try 8" pipe for water quality flow.
Q = CaA(2gh)°'S (orifice fonnula)
A = n(4/12)' = 0.3491 s. f
1.74 = 0.6(0.3491)(2gh)°'S =1.679711 -5
h = 1.07' (from center of water quality pipe to invert of overflow)
1.41' from invert of water quality pipe to invert of overflow
F;Wbs11700 m itage PincskOvernll Wctlnndsd)ocumcnts\Rcpor slsplittcr CalcsQ.dac 3/15106
DWQ Project No.
DIVISION OF WATER QUALITY - LEVEL SPREADER WORKSHEET
I. PROJECT INFORMATION (please complete the following Information):
Project Name : Heritage Pines Subdivision
Contact Person: Peyton N. Joyner P E Phone Number. 919 469-1101
Level Spreader ID: E
Level Spreader Length ft 18
Drainage Area ac. 0.53
Impervious Area ac. 0.42
Maximum Filter StripiBuffer Slope 8 %
Grass
Max. Discharge from a 10 Year Storm 3.06 cis
Max. Discharge to Level Spreader 3.06 cis
Filter Strip/Suffer Vegetation Grass
Pre-treatment or Bypass Method None
II. REQUIRED ITEMS CHECKLIST
(perpendicular to flow)
(on-site and off-site drainage to the level spreader)
(on-site and off-site drainage to the level spreader)
(6% for forested, leaf littler cover, 8% for thick ground cover)*
(thick ground cover or grass, canopied forest with leaf litter
groundcover)
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 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
A Ilca t lniilals -
Level spreader is at least 13 ft. per cis for thick ground cover or grass or 100 ft per cis in canopied forest with leaf
litter.
:::? NIA Pre-Form Scour Holes are on flat slopes only
No structures are located In protected buffers*
If bypass method specified in the Draft Level Spreader Design Option Document:
NIA Bypass method is specified (if applicable) and plan details and calculations are provided
NIA Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the bypass
discharge.
No structures are located in protected buffers.
AA Plan details for the bypass and outlets are provided.
The operation and maintenance agreement includes annual erosion and vegetation repair.
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% in areas
with thick ground cover or grass if designed according 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.
F.Vobs117001HcritagcPincs\ovcrall WellandsSDocumentslWorksilcct 0&mus WORKSHEET-Outldfi.doc
DWQ Project No
DIVISION OF WATER QUALITY - LEVEL SPREADER WORKSHEET
1. PROJECT INFORMATION (please complete the following Information):
Project Name : Heritage Pines Subdivision
Contact Person: Peyton N. Joyner P E Phone Number. L 91469-1101
Level Spreader ID: 0
Level Spreader Length ft. 21
Drainage Area ac, 0 37 (perpendicular to flow)
Imper rains toes Area ac. 0 26 (on-site and off-site drainage to the level spreader)
D
Maximum Filter Strip/Buffer Slope g o% o (on-site and off-site drainage to the level spreader)
Grass (6% for forested, leaf littler cover, 8 /a for thick ground cover)*
Max. Discharge from a 10 Year Storm 1.60 cfs
Max. Discharge to Level Spreader 1.60 cis
Filter StriplBuffer Vegetation Grass (thick ground cover or grass, canopied forest with leaf litter
Pre-treatment or Bypass Method None groundcover)
II. REQUIRED ITEMS CHECKLIST
Initial in the space provided to Indicate the following design requirements have been met and supporting documentation is attached. lfa
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal indudes
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.
A licant Initials
Level spreader is at least 13 it. per cis for thick ground cover or grass or 100 ft per cfs In canopied forest with leaf
Miter.
NIA Pre-Form Scour Holes are on fiat slopes only
No structures are located In protected buffers*
If bypass method specified in the Draft Level Spreader Design Option Document:
NIA Bypass method Is specified (If applicable) and plan details and calculations are provided
NIA Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the bypass
discharge.
No structures are located In protected buffers.
N A Plan details for the bypass and outlets are provided.
The operation and maintenance agreement includes annual erosion and vegetation repair.
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%a in areas
with thick ground cover or grass if designed according 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.
F.VobA17001icritage PinesiOvernll Wettands\Documents\Worlsheet O&M1LS WORKSHEET- Outlet O.doc
DWQ Project No
DIVISION OF WATER QUALITY - LEVEL SPREADER WORKSHEET
1. PROJECT INFORMATION (please complete the following information):
Project Name : _ Heritage Pines Subdivision
Contact Person. Peyton N. Joyner P E Phone Number. [phone]
Level Spreader 1D: F
Level Spreader Length ft. 40
Drainage Area ac. 0.28
Impervious Area ac. 0.04
Maximum Filter Strip/Buffer Slope 8 %
Grass
Max. Discharge from a 10 Year Storm 1.31 cfs
Max. Discharge to Level Spreader 1.31 cis
Filter StripBuffer Vegetation
Pre-treatment or Bypass Method NIA
It. REQUIRED ITEMS CHECKLIST
(perpendicular to flow)
(on-site and off-site drainage to the level spreader)
(on-site and off-site drainage to the level spreader)
(6% for forested, leaf littler cover, 8% for thick ground cover)'
(thick ground cover or grass, canopied forest with leaf litter
groundcover)
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 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
A lic• nts nitials
Level spreader is at least 13 ft. per cfs for thick ground cover or grass or 100 ft per cis in canopied forest with leaf
litter.
NIA Pre-Form Scour Holes are on flat slopes only
No structures are located In protected buffers'
If bypass method specified in the Draft Level Spreader Design Option Document:
NIA Bypass method Is specified (if applicable) and plan details and calculations are provided
NIA Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the bypass
discharge.
M No structures are located in protected buffers.
Plan detalls for the bypass and ouQets are provided.
RA IL The operation and maintenance agreement includes annual erosion and vegetation repair.
The operation and maintenance agreement signed and notarized by the responsible party is provided.
* Level spreaders in series can be used an slopes of up to 15% in forested areas with leaf littler cover or on slopes of up to 25% in areas
with thick ground cover or grass if designed according 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.
I'Nobsk1700U-leritage Pines\Overall Wetlands\Documcnls\Workshect O&MlLS WORKSI•iEET - Outlet Rdoe
DWQ Project No.
. DIVISION OF WATER QUALITY- LEVEL SPREADER WORKSHEET
1. PROJECT INFORMATION (please complete the following information):
Project Name : Heri a e Pines Subdivision
Contact Person: Peylon N. Joyner P E _ Phone Number 919 469-1101
Level Spreader 10: P
Level Spreader Length it 118
Drainage Area ac. 1.93
Impervious Area ac. 0.66
Maximum Filter Strip/Buffer Slope a %
Grass
Max. Discharge from a 10 Year Storm 9.05 cis
Max. Discharge to Level Spreader 9.05 cis
Fitter Strip/Buffer Vegetation Grass
Pre-treatment or Bypass Method None
11. REQUIRED ITEMS CHECKLIST
(perpendicular to flaw)
(on-site and off-site drainage to the level spreader)
(on-site and off-site drainage to the level spreader)
(6% for forested, leaf littler cover, 8% for thick ground cover)'
(thick ground cover or grass, canopied forest with leaf litter
groundcover)
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 exptanaUdn of why. At a minimum, a complete stormwater management plan submittal includes
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.
A Itc nt. Initials
Level spreader is at least 13 fL per cis for thick ground cover or grass or 100 ft per cis In canopied forest with leaf
litter.
N/A Pre-Form Scour Holes are on flat slopes only
No structures are located In protected buffers*
If bypass method specified in the Draft Level Spreader Design Option Document:
N/A Bypass method is specified (if applicable) and plan details and calculations are provided
N/A Discharge to level spreader and subsequent filter strip Is hydraulically and spatially separate from the bypass
P, discharge.
No structures are located in protected buffers.
77 N Plan details for the bypass and outlets are provided.
The operation and maintenance agreement Includes annual erosion and vegetation repair.
_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% in areas
with thick ground cover or grass if designed according 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.
F:11obs11700\I1eritagc PincslOvcrall Well andslDocumcnts\Workslicct O&M\LS WORKSHEET - Outlet P.doc
DWQ Project No.
DIVISION OF WATER QUALITY - LEVEL SPREADER WORKSHEET
I. PROJECT INFORMATION (please complete the foilowin inform ti
og a n).
Project Name : Heritage Pines Subdivision
Contact Person: Peyton N. Joyner P E Phone Number 919 469-1101
Level Spreader ID: R
Level Spreader Length ft. 16
Drainage Area ac. 0.27
Impervious Area ac. 0.20
Maximum Filter Strip/Buffer Slope 8 ado
Grass
Max. Discharge from a 10 Year Storm 1.18 cis
Max. Discharge to Level Spreader 1.18 cis
Filter Strip/Buffer Vegetation Grass
Pre-treatment or Bypass Method None
II. REQUIRED ITEMS CHECKLIST
(perpendicular to flow)
(on-site and off-site drainage to the level spreader)
(on-site and off-site drainage to the level spreader)
(6% for forested, leaf littler cover, 8% for thick ground cover)`
(thick ground cover or grass, canopied forest with leaf Utter
groundcover)
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 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.
A lic nts Initials
Level spreader is at least 13 it per cfs for thick ground cover or grass or 100 ft per cfs in canopied forest with leaf
fitter.
N1A Pre-Form Scour Holes are on flat slopes only
V No structures are located in protected buffers'
If bypass method specified in the Draft Level Spreader Design Option Document
NIA Bypass method is specified (if applicable) and plan details and calculations are provided
NIA Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the bypass
discharge.
P No structures are located in protected buffers.
N Plan details for the bypass and outlets are provided.
The operation and maintenance agreement Includes annual erosion and vegetation repair.
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% in areas
with thick ground cover or grass If designed according 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.
P:Uobs11700WcritagePinesiOverali Wetiands\DocumentskWorlulicct O&M1LS WORKSHEET - OutictR.doc
DWQ Project No.
------------
DIVISION OF WATER QUALITY - LEVEL SPREADER WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name : Herita a Pines Subdivision
Contact Person: Pe on N. Joyner P.E. Phone Number. 919 469-1101
Level Spreader ID: S
Level Spreader Length ft. 210
Drainage Area ac. 10.19
Impervious Area ac. 4.06
Maximum Filter Strip/Buffer Slope 8 ova
Grass
(perpendicular to flow)
(on-site and off-site drainage to the level spreader)
(on-site and off-site drainage to the level spreader)
(6% for forested, leaf littler cover, 8% for thick ground cover)*
Max. Discharge from a 10 Year Storm 44.48 cis
Max. Discharge to Level Spreader 16.14 cfs
Filter Strip/Buffer Vegetation Grass (thick ground cover or grass, canopied forest with leaf litter
groundcver)
Pre-treatment or Bypass Method Wet Pond treatment bypass by separa
te weirfrom pond
11. 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 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
A lic is nitials
Level spreader is at least 13 ft. per cis for thick ground cover or grass or 100 ft per cis in canopied forest with loaf
litter.
NIA Pre-Form Scour Holes are on flat slopes only
No structures are located In protected buffers*
If bypass method specified in the Draft Level Spreader Design Optlon Document:
AZI= Bypass method is specified (if applicable) and plate details and calculations are provided
Discharge to level spreader and subsequent filler strip is hydraulically and spatially separate from the bypass
n discharge.
No structures are located in protected buffers.
Plan details for the bypass and outlets are provided.
The operation and maintenance agreement includes annual erosion and vegetation repair.
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% in areas
with thick ground cover or grass if designed according 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 i of a protected buffer area.
F:Uobs117001Hcritage Pincs\OvemiI Wetiands\Documents\Worlshcct O&tvl1LS WORKSHEET - Outlet S.doc
DWQ Project No.
DIVISION OF WATER QUALITY • LEVEL SPREADER WORKSHEET
1. PROJECT INFORMATION (please complete the following information):
Project Name : _ HPrilanp Plnac Cnhrli.,i?:...
Contact Person: Peyton N. Joyner P E v?yVPhone Number: [phone]
Level Spreader ID: T
Level Spreader Length ft.
Drainage Area ac.
Impervious Area ac.
Maximum Filter Strip/Buffer Slope
Grass
Max. Discharge from a 10 Year Storm
Max. Discharge to Level Spreader
Filter Strip/Buffer Vegetation
Pre-treatment or Bypass Method
Ii. REQUIRED ITEMS CHECKLIST
46
0.68
0.42
8
(perpendicular to flow)
(on-site and off-site drainage to the level spreader)
(on-site and off-site drainage to the level spreader)
% (6% for forested, leaf littler cover, 8% for thick ground cover)'
3.49 cis
3.49 c{s
Grass
None
(thick ground cover or grass, canopied forest with leaf litter
groundcover)
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 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
A iicants Initials
Level spreader is at least 13 fL per cis for thick ground cover or grass or 100 ft per cfs in canopied forest with leaf
litter.
NIA Pre-Form Scour Holes are on fiat slopes only
No structures are located in protected buffers'
If bypass method specified in the Draft Level Spreader Design Option Document:
WA Bypass method Is specified (f applicable) and plan details and calculations are provided
NIA Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the bypass
discharge.
No structures are located in protected buffers.
N Plan details for the bypass and outlets are provided.
The operation and maintenance agreement includes annual erosion and vegetation repair.
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% in areas
with thick ground cover or grass if designed according 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.
' FAJohs\1700\Hcrito9C Pincs\Ovcrnlt Wcttands\Documcnts\Workshcct 0&WLS WORKSHEET -Outlet T.doc
DWQ Project No.
DIVISION OF WATER QUALITY - LEVEL SPREADER WORKSHEET
1. PROJECT INFORMATION (please complete the following information):
Project Name : Herita a Pines Subdivision
Contact Person: Peyton N. Joyner P E Phone Number. [phone]
Level Spreader ID: U
Level Spreader Length it N/A
Drainage Area ac. 1.70
Impervious Area ac. 0.61
Maximum Filter Strip/Buffer Slope 8 %
Grass
Max Discharge from a 10 Year Storm 7.12 cis
Max. Discharge to Level Spreader 7.12 cis
Filter StripBuffer Vegetation Grass
Pre-treatment or Bypass Method None
11. REQUIRED ITEMS CHECKLIST
(perpendicular to flow)
(on-site and off-site drainage to the level spreader)
(on-site and off-site drainage to the level spreader)
(6% for forested, leaf littler cover, B% for thick ground cover)`
(thick ground cover or grass, canopied forest with leaf litter
groundcover)
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 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
Applicants Initials
N/A Level spreader is at least 13 ft. per cis for thick ground cover or grass or 100 ft per cis in canopied forest with leaf
litter.
Pre-Form Scour Holes are on flat slopes only
No structures are located in protected buffers*
If bypass method specified in the Draft Level Spreader Design Option Document:
N/A Bypass method is specified (if applicable) and plan details and calculations are provided
NIA Discharge to level spreader and subsequent filter strip Is hydraulically and spatially separate from the bypass
discharge.
No structures are located In protected buffers.
N A Plan details for the bypass and outlets are provided.
The operation and maintenance agreement includes annual erosion and vegetation repair.
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 cr on slopes'of up to 25% in areas
With thick ground cover or grass if designed according 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.
F:Jobs\1700111critagePincs\Ovcrall Wcdands\Documents\Workshee( O&M\LS WORKSFIEEr - OutletU.doc
OPERATION AND MAINTENANCE PLAN
FOR
HERITAGE PINES SUBDIVISION STEP-POOL
STRUCTURE
This is the proposed Operation and Maintenance (O&M) Plan for the step-pool structure
at stormwater outlet outfall "I" in the Heritage Pines Subdivision in Cary, NC.
1. Inspection Frequency
The outlet energy dissipation device shall be inspected after every significant runoff
producing rainfall event (roughly 0.5 inches of rainfall) and at least twice annually.
Inspections shall be performed by persons of sufficient background and understanding of
the structure and its intended purpose.
2. General Inspection
General inspection activities for the Step-Pool Outlet Structure shall include:
a. Inspection for trash accumulation and general structure. condition. Litter and
debris shall be removed from the device and the adjacent pipe and flared-end
section.
b. Inspect for localized bed and bank erosion at and in the immediate vicinity of the
step-pool structure and the stormwater outlet (at flared-end section). Identify any
deficiencies with the installed method of stabilization to include displacement of
boulders, riprap, or other stone material.
c. Inspect contributing storm water collection system (i.e. piping, riprap, inlets, etc.)
for condition and proper function.
3.,_..Mantenance and_Repairs................_................ .
Maintenance and repair activities shall include:
a. Repair eroded areas to include adjacent channel banks and tie-in slopes
immediately, re-seed (and install erosion control matting) as necessary to
maintain good vegetative cover. Remove unwanted woody vegetation which has
grown within the structure limits.
b. Make repairs to contributing storm water collection system to maintain proper
function.
c. Remove excessive accumulated sediment and debris from step-pool structure.
Page 1 of 2
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.
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
step-pool outlet protection structure. 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.
ACKNOWLEDGEMENT:
I acknowledge and agree by my signature below that I am responsible for the
performance of the above listed inspection and maintenance procedures. I agree to notify
NCDENR - DWQ of any problems, other that routine maintenance, with the system prior
to any changes to the system or responsible party.
Print Name:
Title: e,%Cst h' ? - H-cr 8 4A(-( A N-C S comnlo"Ul k AS61-4 A &I',
Address:
le/r1 A) C 26t7
Phone
Signature: Date-
.............I=- ?(.?•?V1 TT- ? ?l ,.a.Notary ..Public for the. State of.North-Carolina
County of C;_ V Q- , do hereby certify that ra V (f
Personally appeared before me this Z? day of t C , ZGO?,- , and
acknowledged the due execution of the forgoing wetland detention maintenance
``,\\\\ 11 \ 111 t 1 l t U f! I7 ! I/ /?/??'' f
requirements. fitness my hand i offici _ seal, ?`?>?Qp?N H?'%
NOTARY
My commission expires ??? 7 ZG l Q?? PU9t C
Page 2 of 2
OPERATION AND MAINTENANCE PLAN
FOR
HERITAGE PINES SUBDIVISION POCKET WETLAND
This is the proposed Operation and Maintenance (0&M) Plan for the pocket wetland at
stormwater outlet outfall "H" in the Heritage Pines Subdivision in Cary, NC.
1. Inspection Frequency
The treatment dcvice and its structural components, to include the sediment forebay, shall
be inspected after every significant runoff producing rainfall event (roughly 0.5 inches of
rainfall) and at least twice annually. Inspections shall be performed by persons of
sufficient background and understanding of the structure and its intended purpose.
2. General Inspection
General inspection activities for the Pocket 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
inlets, sediment forebay, riser trash rack and the drawdown orifice.
b. Check and clear drawdown orifice of any obstructions such that the drawdown of
the micro pool occurs within the 2 day design period.
c. Inspect contributing storm water collection system (i.e. piping, riprap, inlets, etc.)
for condition and proper function.
d. Inspect sediment forebay and pocket wetland for sediment accumulations at a
minimum of every six months and after each runoff producing rainfall event. The
depth of sediment within the forebay and wetland shall be measured during each
inspection.
3. Structural Inspection
Structural inspections of the Pocket Wetland shall include the following:
a. Inspect for erosion at the forebay inlet stabilization and outflow weir, and outlet
protection apron (at flared-end section). Identify any deficiencies with the
installed method of stabilization to include displacement of riprap.
b. Inspect the sediment forebay and weir for function and condition (including depth
of sediment).
Page I of 4
c. Inspect for erosion along the wetland perimeter. Inspect perimeter slopes for
cracking or settling, slope stability, ground cover, and 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 or 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 to include the vicinity of the
outlet flared-end section.
4. Maintenance and Repairs
Maintenance and repair activities shall include:
a. Repair eroded areas to include embankment or perimeter slopes immediately, re-
seed as necessary to maintain good vegetative cover. 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 pocket wetland 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 and readily penetrate into accumulated sediments.
Pocket Wetland - If the elevation of the marsh area exceeds the micropool
elevation by more than 12 inches, the wetland shall be regraded to design
levels (approximately 0" to 6" above micropool). This shall be performed by
.....,removing...the.upper-6. inches. of.soil.and.stockpiling. it....Then.the-marsh.area .................................................
shall be excavated to the micropooI elevation. Afterwards the stockpiled soil
should be spread over the marsh surface such that its elevation ranges between
0" and 6" above the micropool. 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.
Page 2of4
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 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 pocket 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
pocket wetland. 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 3 of 4
ACKNOWLEDGEMENT:
1 acknowledge and agree by my signature below that I am responsible for the
performance of the above listed inspection and maintenance procedures. I agree to notify
NCDENR - DWQ of any problems, other that routine maintenance, with the system prior
to any changes to the system or responsible party. VAL 1 ? Print Name: ..e <
Title: feSl t_rrT ` Htr { ,N C t&,W17hh, SSdC.
Address: ? ?U1 t& JAiU35 ?k e 1 1 2 ? ?t ? r ?, ?UL ??,}
Phone: q I?, Ss41- l?v y
Signature: Date: 3?Z??U h
a Notary Public for the State of North Carolina,
County of _ W G , do hereby certify that V I P
Personally appeared before me this day of, 6A P, [A and
acknowledged the due execution of the forgoing wetland detention maintenance
requirements. Witness my hand and official seal, JH #1'
.,
00
NOTARY
S& *** ?
PUBUC -
S jJ
My commission expires _ '?,?-•`'?.,,_,,,...••'' •?;
vjp.
Page 4 of 4
'Project: Heritage Pines Subdivision _ Outlet(s): U. Y
SCOUR HOLE OPERATION AND MAINTENANCE AGREEMENT
The scour hole is defined as a rock-lined depression, level threshold, designed to diffuse storm-water runoff.
Maintenance activities shall be performed as follows:
1. After construction and until vegetation has been established, scour hole(s) shall be inspected after every rainfall.
Thereafter, scour hole(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 scour hole(s) for evidence of scour, undercutting, settlement of the structure, and
concentrated flows downhill from the scour hole(s).
c. A level elevation shall be maintained across the entire flow-spreading structure at all times.
Repair or replace the scour hole 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 scour hole 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.
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.
IG, 120Z-e , a Notary Public for the State of Z?ftva Ir7tq
County of ljl. , do hereby certify that t-( e ki -e
personally appeared before me this day of _a,_1 7- kQ V61. 7-Wk?? and acknowledge the due
execution of the forgo ng•wet [wetland detente ion basin maintenance requirements. Witness my hand and
official seal,
?`°??????" RpZ?
?? 1y07A¢Y
1• PUBLIC f:
SEAL
My commission expires ?( t __V ( D
Page 1 of 1
Print name: Karl Bever
Title: President- Heritage Pines Community Association
Address: 1201 Edwards Mill Rd. Raleigh NC 26707
Project: Heritage Pines Subdivision Outlet(s): E. F, D. P. R S T J L M N Q
LEVEL SPREADER OPERATION AND MAINTENANCE AGREEMENT
The level spreader is defined as an elongated, level threshold, designed to diffuse storm-water 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, splitter box, 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: Karl Bever
Title: President- Heritage Pines Community Association
Address: 1201 Edwards Mill Rd Raleigh NC 26707
Note: I ne 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, y',21, (202 -e
a Notary Public for the State of CQtIYII?,
County of a-k - , do hereby certify that
personally appeared before me this day of _n - K? 0 r'CM ?d and acknowledge the due
.
......_.._..._._..__... ......................_...._.._.................................._._..._........_....._......__..._............ ........__........................._.........__.... ....._.........._........._...._._..................._....._......._.._........................
ekecutron of the forgoing wet [wetland detention basin maintenance requirements. Witness my hand and
official seal,
f S
'M' NOTARY S?` '
^?4 PUBLIC
y .f V •
SEAL
My commission expires 4-1?f Zo t )
Page 1 of 1
STORMWATER CONTROL STRUCTURE MAINTENANCE AGREEMENT
PROJECT: Heritage Pines Subdivision
RESPONSIBLE PARTY: Heritage Pines Comrrtunit Association
PHONE #: [phone]
ADDRESS: 1201 Edwards Mill Rd
Raleigh, North Carolina 26707 .
1. Monthly or after every runoff producing rainfall, whichever comes first:
a. Remove debris from trash rack.
b. Check and clear orifice of any obstructions.
c. Check pond side slopes; remove trash, repair eroded areas before next rainfall.
11. Quarterly
a. Inspect the collection system (i.e., catch basin, piping, grassed swales). for proper functioning.
Clear accumulated trash from basin grates, and basin bottoms, and check piping for obstructions.
b. Check pond inlet pipes for undercutting. Repair if necessary.
c. Repair any broken pipes.
d. Replace rip rap that is choked with sediment.
III.: Semi-Annually
a. Remove accumulated sediment from bottom of outlet structure.
b. Check pond depth at various locations. If depth is reduced to 75% of original design depth, remove
sediment to original design depth.
IV. General
a. 'A natural buffer is encouraged along the banks of the pond where appropriate. Annual mowing can
be used to maintain a low buffer. Vegetation along the dam should be mowed on a regular basis to
discourage root intrusion.
b. Wetland plants are encouraged along pond perimeter, however, invasive species such as cattails
must be removed when they cover the entire surface area of pond.
c. All components of impoundment system are to be kept in good working order.
d. In case the ownership of the Impoundment Transfers, the current owner shall, within thirty (30) days
of transfer of ownership, notify the Town of Cary Engineering Department, Stormwater
Management Division of such ownership transfer.
e. This property and impoundment is also subject to the Operation and Maintenance Manual filed with
the register of deeds.
- We;-The -Heritage-Pines Community-Association; hereby "acknowledge`that we are the financially responsible
party for maintenance of this impoundment. We will perform the maintenance as outlined above, as part of the
Certificate of 1 nce with Stormwater Regulations received for this project.
Signature: Date: 2?'U
Preside nt
Vey (+ o?c;2 el{ r
I, a Notarv Public for the State of CCtYri(! , County ofWd.1CQ
,
do hereb certify that '""° "l?
??'? P?? eared before me this ?_ day of
200 fj and aclmowl d ed?usep exe?s
?" w4
•SY"t 4egomg instrument. Witness my
,hand and official seal, '`k+.l?
NOTARY '
Seal a
lei
M?{l E=gsich expires:
ckc
li?
Maintenance Agreement LL r U
OPERATIONS AND MAINTENANCE MANUAL
Project: Heritage Pines Subdivision
STORMWATER CONTROL STRUCTURE
1=or Wet Detention Pond #3
Cary, NC
Owners: Heritage Pines Community Association
Prepared By: Hugh ]. Gilleece III and Associates, P.A.
Date: 3 z -71-6 G
Project: Heritage Pines Subdivision
Date Constructed: Spring of 2006
Location: Carpenter Upchurch Rd
Receiving Water Course: Crabtree Lake Watershed
Contractor: (List below)
Impoundment & Dam Percy L. Johnson, Inc
Spillway Percy L. Johnson, Inc
Material Supplies: (List below)
Riser Structure
DIP, Bottom Drain
Clow Gate Valve
Outlet Pipe
Trash Rack
Percy L. Johnson
Percy L. Johnson
Percy L. Johnson
Percy L. Johnson
Percy L. Johnson
OPERATIONS & MAINTENANCE MANUAL
(Heritage Pines Subdivision): Wet Detention Pond #3
This manual established procedures for maintenance and operation of the Heritage
Pines Subdivision wet detention pond #3 in accordance with the Town of Cary
guidelines as set forth in the LDO, Chapter 4.4.6.
1. Maintenance of Embankments
A. Vegetation
The embankment has a ground cover of fescue, which if properly maintained
will prevent erosion of the embankment and provide an easy surface for
inspection. The grass will be most difficult to obtain in the area subject to
water level fluctuation below the top of the riser.
01.
Gras: shatild be fertzed
every October and April:
? 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 straw.
? Trees & Shrubs - trees, shrubs, and other landscape vegetation should be
permitted only as shown on the approved planting plan.

B. 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 stormwater runoff. The dam should be inspected
for these areas. Proper care of vegetative areas that develop erosion is
required to prevent more serious damage to the embankment. Rills and
gullies should be filled with suitable soil compacted and then seeded.
Methods described in Section I-A, 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 embankment crest instead of a uniform distribution of runoff. This
can be corrected by reshaping the crest to more evenly distribute the runoff to
areas, which are not experiencing erosion problems. The top of the dam
should not be allowed to be used for pedestrian or bicycle traffic.
? Abutment Areas -- the abutment is the line formed where the embankment
fill comes into contact with the existing slope. Runoff from rainfall
concentrates in these gutter areas and can reach erosive velocities
because of the steep slopes. If a normal stand of grass cannot be
maintained on the abutments, additional measures may be needed such
as jute matting to provide for the establishment of a good ground cover.
? Upstream Embankment Slope - Erosion problems can develop on the
upstream face of the dam due to the fluctuation of water level in the pond.
This is a result of a combination of wave actions and ground saturation,
which occurs from the elevated water levels. The erosion generally
occurs as the water level falls and the saturated ground becomes
subjected to the wave action. If erosion becomes a problem, it may
necessitate the installation of a stone armoring along the zone subject to
fluctuating water level. This would consist of 18" of NCDOT Class B stone
for erosion control underlain with Mirift 140 geotextile fabric. It should be
centered at the point of the erosion problem and covering an area 2'
above and below the approximate center of the eroded area.
C. Seepage
? Detection - due to the fact that the "permanent" impoundment level is only
3' deep, seepage should not be expected on the downstream slope of the
embankment. However, a cursory inspection of the downstream slope
should be made for completeness of the inspection. Seepage may vary in
appearance from a soft wet area to a flowing spring. It may show up first
as only an area where the vegetation is more lush and darker green.
Cattails, reeds, mosses and other marsh vegetation often become
established in a seepage area. The downstream abutment areas where
the embankment fill and natural ground interface are very common
locations for seepage. Also the contact between the embankment and the
spillway conduit is a very common location which is generally attributed to
poor compaction around the conduit. Due to the way in which conduits
are put in, this is generally most evident on the underside of the conduit. •
........... ...................................................._Slides-...may.-.result_.from excessively--saturated. embankment-slopes.-- ..The
natural foundation area immediately downstream of the dam abutment
should also be inspected to ensure that "piping" is not occurring
underneath the embankment. "Piping" may appear as a "boil" evident as
spring carries soil. The soil usually deposits around the boil area and is
evident by the sedimentary deposits accompanying it. Seepage can also
occur into the spillway conduit through cracks in the pipe or improperly
sealed joints. These can be seen by observing the conduit when the
water level is high. The movement of the water itself is not dangerous, but
if soil particles are being carried with it, then it can create a shortcut for the
piping of soil. This might show up on the upstream face of the
embankment roughly along the line of the conduit itself.
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TEMPORARY SEEDING MEA5URE5 t 07 8
t FRO51ON CONTROL MATTING DETAIL
D. Cracks, Slides, Sloughing, and Settlement
? Cracks -- the entire embankment should be inspected for cracks. Short,
isolated cracks are usually not significant, but larger cracks (wider than
%"), well defined cracks indicate a serious problem. There are two types
of cracks: transverse and longitudinal.
Traverse cracks appear crossing the embankment and indicated
difference of settlement within the embankment. these cracks
provide avenues for seepage and piping could develop.
Longitudinal cracks run parallel to the embankment and may signal
the early stages of a slide. In recently built structures, these cracks
may be indicative of poor compaction or poor foundation
preparation resulting in consolidation after construction.
• Slides - Slides and slumps are serious threats to the safety of an
embankment. Slides can be detected easily unless obscured by
vegetation. Arch shaped cracks are indications that slides are slipping or
beginning to slip. These cracks soon develop into large scarps in the
slope at the top of the slide.
? Settlement - settlement occurs both during construction and after the
embankment has been completed and places in service. To a certain
degree this is normal and should be experienced. It is usually the most
pronounced at the location of maximum foundation depth or embankment
height. Excessive settlement will reduce the free board (difference in
elevation between the water surface and the top of the dam). Any area of
excessive settlement should be restored to original elevation and condition
to reduce the risk of overtopping. A relatively large amount of settlement
(more than 6") within a small area could indicate serious problems in the
foundation or perhaps the lower part of the embankment. Settlement
accompanied by cracking often precedes failure.
? What to do if seepage, cracks, slides or settlement are detected: If any of
the above items are detected there may be signs of significant problems,
which could lead, to the failure of the structure. A geotechnical or civil
engineer should be consulted regarding the origin of these problems and
for the assessment of the appropriate solutions for correcting them. If the
: ..... ....... ....... _....... ........... ............... professio.nal_.is...not...immediately-able-to--inspect--the-dam;--then-the-bottom ............. ....................
drain should be opened and the water level lowered to remove the risk of
failure until a professional can observe these problems.
E. 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 spillway. Groundhog and muskrats
thrive on burrowing in the manmade earth embankments, which become
pathways for seepage. In the event that burrows are detected within the dam,
then the rodents should be dealt with by removal.
II. MAINTENANCE OF SPILLWAYS & CONTROL STRUCTURES
A. Inspection of Spillway Conduits
Conduits should be inspected thoroughly once a year. Conduits should be
visually inspected by actually entering the conduit a sufficient distance
between the riser structure and the outlet to check all the joints. Because the
outlet works tie into the street storm sewer system, catch basins and pipes.
Conduit should be inspected for proper alignment (sagging), elongation and
displacement at joints, cracks, leaks, surface water, surface wear, loss of
protective coating, corrosion and blocking. Problems with conduits most often
occurs 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 embankment material and possibly the piping of soil material through the
joints. Catch basin should be checked for signs that water is seeping along
the exterior surface of the pipe where it enters the catch basin. A depression
in the soil surface over the pipe may be signs that soil is being removed from
around the pipe.
? What to do if problems are detected with the spillway: Retain the
assistance of a civil engineer or geotechnical engineer qualified in the
design of embankments to perform an inspection of the dam. If in doubt,
lower the water surface elevation of the pond until such time as an
inspection can be performed by a qualified professional.
B. Trashracks on Pipe Spillways
The spillway riser for this dam is the primary spillway structure accompanied
by an emergency rock-lined weir overflow. The intake structure has been
fitted with a trashrack to prevent debris from entering the spillway structure.
Most of the runoff entering the pond comes in through grated inlets, which
have essentially provided filtration of the runoff and should limit the size of the
debris that enters the basin to fioating debris which will most likely pass
through the trashrack. The opening between the trashrack and riser is
smaller than the opening of the outlet
pipe. The intent is that any debris,
which passes through the_trishrack,...will_be.easily_passed-by.Ahe-pipe-outlet ....
Maintenance should include periodically checking the rack for rusted or
broken sections and repairing as needed. The trashrack should be checked
frequently during and after storm events to ensure that it is properly
functioning and to remove accumulated debris.
III. OPERATION
A. Lake Drains
Lake drains should always be operable so that the pool level can be drawn
down in case of an emergency or for repairs or maintenance. Lake drain
valves or gates that have not been operated for a long time present a special
probl.em. Generally, when draining the pond, it should be drained slowly.
Open the drain until a good flow of water is present but not a torrent, so that
the water level can be drained over a period.of 48 hours or more. Rapidly
lowering the water level in the pond can cause permanent damage to the
embankment and must be avoided. The gate valve controlling the lake drain
should be operated from fully closed to fully opened position at least twice a
year.
B. Record Keeping
Operation of a dam should include recording of the following:
? Annual Inspection Reports - a collection of written inspection report
should be kept on record in Section IV of this manual. Inspection should
be conducted annually. Copies should be provided to the Town of Cary
Stormwater Management Section of the Engineering Division.
? Observations - all observations should be recorded. Where periodic
inspections are performed following significant rainfall events, these
inspections should be logged into the Periodic Inspection, Operation &
Maintenance Form in Section IV of this manual.
? Maintenance - written records of maintenance and/or repairs should be
recorded on the Periodic Inspection, Operation & Maintenance Form in
Section IV of this manual.
? Other Operation Procedures - the owner should maintain a complete and
up-to-date set of plans (as-built drawings) and all changes made to the
dam over time should be recorded on the as-builts.
C. Sedimentation & Dredging
Sedimentation from establishing areas tributary to the pond will eventually
result in the reduction of the retention pool and eventually will have to 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 other treatments necessary to promote a stable
groundcover and minimize sedimentation to the pond. The maintenance on
............ ...... ............. ............. ...... ..................... this-pond -requires..that when-the-sediment-level-(as-measured-from-the-top-of
the riser to the sediment pool) is within 36" of the top of the riser that the
sediment must be removed and the original pond restored. For aesthetic
purposes it may be desirable to maintain it prior to this point. Generally, the
dredging process begins with the removal of as much water as possible from
the deposited silt and so the material can be excavated with conventional
equipment for trucking offsite. The removed material should be hauled offsite
to a suitable landfill site or mounded somewhere on site and stabilized with a
groundcover sufficient to restrain erosion.
IV. INSPECTION, OPERATION & MAINTENANCE CHECKLISTS
V. SPECIAL CONSIDERATIONS
POND INSPECTION CHECKLIST
Date:
Time:
Heritage Pines Subdivision Wet Detention Pond #3, Cary, NC
SPILLWAYS - DRAINS - OUTLETS
Check/Circle
Condition Noted
Principal Observations

Type: Action -
Re
air Action -

Monitor Action

Investigative
S illwa
Trashracks/Debris

Cracks/Deterioration

Joint Deterioration

Improper Alignment
Cracks/Deterioration
Joint Deterioration
Seepage/Piping
Undercutting
Erosion
Oebris
Lake Type:
Drain/Other
Outlets
GatesNalves
Operability

General Comments, Sketches & Field Measurements
POND INSPECTION CHECKLIST
Date:
Time:
Heritage Pines Subdivision Wet Detention Pond #3, Cary, NC
EMBANKMENT -- POOL
Check/Circle Condition
Noted
U/S Sloe Observations

Type: Action -
Re air Action -
Monitor Action
Investi ative
Vegetation/Riprap
Beaching/slides/cracks
Undermining/erosion
Rodent burrows
Crest Type:
Ruts/erosion
Cracks/settlement
Poor alignment
D S Slo e Type:
Vegetation/erosion
Rodent burrows
Slou hs/slides/cracks
See a e/wetness
Pool T e:
Erosion/ round cover
Sedimentation
Water quality
Abutment T We:
Vegetation/erosion
Slough/slides/cracks
Seepage/wetness
General Comments, Sketches & Field Measurements
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PERODIC INSPECTION, OPERATION & MAINTENANCE RECORDS
Heritage Pines Subdivision Wet Detention Pond #3, Cary, NC
Return to: Thomas L. Horstman, CPESC
Erosion Control Supervisor
DEVELOPMENT REVIEW
Town of Cary
PO Box 8005, Cary, NG 27512
NORTH CAROLINA
WAKE COUNTY
STORMWATER CONTROL STRUCTURE AND ACCESS
EASEMENT AND AGREED='[ENT (Corporate)
THIS STORMWATER CONTROL STRUCTURE AND ACCESS EASEMENT
AND AGREEMENT, made this. day Zl- of M&C , 2006, by Heritage Pines
Community Association, a North Carolina corporation whose principal address is 1201
Edwards Mill Rd., Raleigh, NC 26707, (hereafter "Grantor"), with, to, and for the benefit
of the Town of Cary, a municipal corporation of the State of North Carolina, whose
address is P.O. Box 8005, Cary North Carolina 27512-8005 (hereinafter "Grantee" or
"Town").
WITNESSETH:
WHEREAS, Heritage Pines Community Association , is the owner in fee simple
of certain real property, situated in the Town of Cary, County of Wake, North Carolina
and more particularly described as follows:
The real property is as shown on plat recorded In the office of Wake County
Register of Deeds in Book of Maps 2006, Pg.
.. .......... .......It._being ..the. same-land conveyed -to-the-Grantor-by deed recorded in-Book ..... ....... at................................ ...
page in the Office of the Register of Deeds for Wake County (hereafter referred to
as "Property"); and
WHEREAS, the property is located within the planning jurisdiction of the Town of
Cary, and is subject to certain requirements set forth in the Land Development
Ordinance of the Town, (hereafter "Cary LDO"), as such may be amended from time to
time; and
WHEREAS, one of the conditions for development of Property is the granting or
dedication of a Stormwater Control Structure easement, which includes the
implementation of certain stormwater practices such as, but not limited to, the
construction, operation and maintenance of engineered stormwater control structure(s)
Watershed Protection Agreement Page 1 of 5
as provided in Cary LDO; the dedication of an access easement for inspection and
maintenance of the Stormwater Control Structure easement area and engineered
structures; and the assumption by Grantor of certain specified maintenance and repair
responsibilities; and
WHEREAS, this Easement and Agreement has been procured in accordance
with the requirements of N.C. G.S. Sec 143-211 et. se g. and Chapter 4, Part 4.6 of the
Cary LDO.
NOW, THEREFORE, for a valuable consideration, including the benefits Grantor
may derive therefrom, the receipt of which is hereby acknowledged, Grantor has
dedicated, bargained and conveyed and by these presents does hereby dedicate
bargain, sell, grant and t;onvey unto the Grantee, its successors and assigns, a
perpetual, and irrevocable right and easement in, on, over, under, through and across
Property (1) for a STORMWATER CONTROL STRUCTURE easement ("hereafter SCS
Easement") of the nature and character and to the extent hereinafter set forth, more
particularly shown and described on Attachment B.O.M. 2006 Pg. , which is attached
hereto and incorporated herein by reference; upon which Grantor shall construct,
maintain, repair and reconstruct stormwater control structure(s), including detention
pond(s), pipes and water control structures, berms and dikes, and shall establish and
maintain vegetative filters and groundcovers; and (2)an access easement more
particularly shown and described on Attachment B.O.M. 2006 Pg. , for the purpose of
permitting Town inspection and, if necessary, maintenance and repair of the SCS
Easement and engineered structure(s) as more fully set forth herein and in Cary LDO.
The terms, conditions, and restrictions of the Stormwater Control Structure
Easement and Access Easement are:
1. The requirements pertaining to the SCS Easement are more fully set forth in Chapter
Chapter 4, Part 4.6 of Cary LDO. and the "Operation and. Maintenance Manual for
Heritage Pines Subdivision (hereafter "Operations and Maintenance Manual'), Cary,
NC, prepared by Hugh J. Gilleece, 111 and Associates, P.A., and dated March 16, 2006
................
- a-copy-.of-.which-is.-on-file..in._the.Town .of..Cary .. Engineering.. D.epartment..._-Grantor...further ...... .............
agrees Grantor shall perform the following, all at its sole cost and expense:
1. Monthly or after every runoff producing rainfall, whichever comes first:
a. Remove debris from trash rack.
b. Check and clear orifice of any obstructions.
c. Check pond side slopes; remove trash, repair eroded areas before next
rainfall.
Watershed Protection Agreement Page 2 of 5
Il. Quarterly
a. Inspect the collection system (i.e., catch basin, piping, grassed swales) for
proper functioning. Clear accumulated trash from basin grates, and basin
bottoms, and check piping for obstructions.
b. Check pond inlet pipes for undercutting. Repair if necessary.
c. Repair any broken pipes.
d. Replace rip rap that is choked with sediment.
III. Semi-Annually
a. Remove accumulated sediment from bottom of outlet structure.
b. Check pond depth at several locations. If depths are reduced to 75% of
original design depths, remove sediment to original, design depth.
IV. General
a. A natural buffer is encouraged along the banks of the pond where appropriate.
Annual mowing can be used to maintain a low buffer. Vegetation along the dam
should be mowed on a regular basis to discourage root intrusion.
b. Wetland plants are encouraged along pond perimeter, however, invasive
species such as cattails must be removed when they cover the entire surface
area of pond.
c. All components of impoundment system are to be kept in good working order.
d. In case the ownership of the Stormwater Control Structure transfers, the
current owner shall, within thirty (30) days of transfer of ownership, notify the
Town of Cary Engineering Department, Stormwater Management Division of
such ownership transfer.
e. This property and structure are also subject to the Operation and
Maintenance Manual filed with the register of deeds.
............. ';....... 2......_Grantor....... represents ........and.._.....warrant ...... that...... Grantor......is.....financially........responsible......for..............................
construction, maintenance, repair and replacement of all stormwater control structures,
appurtenances and vegetation, including the impoundment. Grantor agrees to perform
the maintenance as outlined above and in the Operations and Maintenance Manual in
consideration of the Certificate of-Compliance with stormwater regulations received for
Property.
3. If Grantor fails to comply with these requirements, or any other obligations imposed
herein, in Cary LDO or Operations and Maintenance Manual the Town of Cary may
perform such work as Grantor is responsible for and recover the costs thereof from
Grantor.
4. This Easement and Agreement gives the Grantee the following affirmative rights:
Watershed Protection Agreement . Page 3 of 5
Grantee, its officers, employees, and agents may enter Stormwater Control Structure
and Access Easement whenever reasonably necessary for the purpose of inspecting
same to determine compliance herewith, to maintain same and make repairs or
replacements to the engineered stormwater control structure(s) and appurtenances and
conditions as may be necessary or convenient thereto in the event Grantor defaults in
its obligations and to recover from Grantor the cost thereof, and in addition to other
rights and remedies available to it, to enforce by, proceedings at law or in equity the
rights, covenants, duties, and other obligations herein imposed.
The Grantor shall in all other respects remain the fee owner of Property and area
subject to these easements, and may make all lawful uses of Property not inconsistent
with these easements.
The Grantee does not waive or forfeit the right to take action to ensure
compliance with the terms, conditions and purposes of this Easement and Agreement
by a prior failure to act.
The Grantor agrees that the terms, conditions and restrictions of this easement
will be inserted by Grantor in any subsequent deed or other legal instrument by which
he divests himself of either the fee simple title to or possessory interests in the subject
property. The designation Grantor and Grantee shall include the parties, their heirs,
successors and assigns.
TO HAVE AND TO HOLD the aforesaid rights, privileges, and easements herein
granted to the Grantee, its successors and assigns forever and the same Grantor does
covenant and that Grantor is seized of said premises in fee and has the right to convey
the same, that except as set forth below the same are free from encumbrances and that
Grantor will warrant and defend the said title to the same against claims of all persons
whosoever.
The covenants agreed hereto and the conditions imposed herein shall be binding
upon the Grantor and its agents, personal representatives, heirs and assigns and all
............ ..........other-_..successors. ._to.....Grantor..._in...interest. .and_..shall....continue....as....a...servitude ..._running ....in.......... ......... .......... .... .......
perpetuity with the above described land.
IN WITNESS WHEREOF, the Grantor has caused this instrument to be signed in
its corporate name by its duly authorized officers and its seal to be hereunto affixed by
authority of its Board of Directors, the day and year first above written.
Watershed Protection Agreement Page 4 of 5
Heritage Pines Community Association
(Grantor)
Presid nt
Attest:
Secretary (Corporate Seal)
NORTH CAROLINA
WAKE COUNTY
I, kaYek • (2Luil, a Notary Public for the state and County aforesaid do here by certify that
r( Reye,- personally appeared before me this day and acknowledge that he is the President of
the Heritage Pines Community Association, a corporation, and that the seal affixed to the foregoing
instrument in writing is the corporate seal of said company, and that said writing was ned and sealed
by her in behalf of said corporation by its authority duly given. And the said S at,4-
acknowledged the said writing to be the act and deed of said corporation.
My commission expires: (-7 ZOl D
Notary ublic
............................(Official Seal]............. ....... ....................... ..............................................._..............._.............................................._.................. .............
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Easement&Deed/Corporate.doc

,?f ?crARY
PUBLIC
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Watershed Protection Agreement Page 5 of 5