20081817 Ver 1_More Info Received_20090424

? ? ? Kimley-Horn
and Associates, Inc.
April 22, 2009
¦
Ms. Cyndi Karoly
P.O. Box 33068
NC Division of Water Quality Raleigh, Norm Carolina
2321 Crabtree Blvd. 276363068
Raleigh, North Carolina 27602
Re: NCDWQ Project # 08-1817 - Northeast Judd Parkway Extension @ F: v/ GC 3704 PCN Application Additional Information Request u
Wake County, North Carolina APP 2 4 2009
Dear Ms. Karoly:
DENR -WATER QUALITY
WETLANDS AND STORMWATER BRANCH
On December 10, 2008, we submitted a Preconstruction Notification Application
on behalf of The Town of Fuquay-Varina for authorization to construct the above
reference project under General Water Quality Certification Number 3704. We
subsequently received a second round of comments from your office, dated
March 25, 2009, requesting additional information about this project. The
requested information is provided below and in the attachments included with
this letter.
The following additional information was requested in your letter of March 25,
2009:
At impact area 4, the scour hole on the northwest quadrant of the road
crossing is placed up slope of an area that is too steep to allow for
diffuse flow (greater than eight percent slope). Please provide EITHER
a level spreader in another location with appropriate slopes OR a BMP
that removes a minimum of 85 percent TSS and 30percent TN from the
stormwater generated by this project. If you provide a BAIP, then
include a completed BMP Supplement Form, with all the required items.
The cross pipe between structures 37 to 38 has been eliminated. The
preformed scour hole at 66+17 -L- (LT) has been eliminated. The ditch
from 62+50 to 64+50 -L- (LT) will be dissipated and treated with a 50'
long bio-retention terrace. The ditch from 61+50 to 64+00 -L- (RT) will
be treated with a 115' long bio-retention terrace. Detail 18 - sheet 2-E
has been added for the bio-retention terraces. Both bio-retention terraces
will outfall into cut ditches that will include check dams and outlet
protection to dissipate the water before entering the buffer. Supplement
forms for the bio-retention terraces have been supplied, as well as,
operation and maintenance agreements.
¦
TEL [phone]
FAX [phone]
? ? ? Kimley-Horn
and Associates, Inc.
2. For the proposed level spreader at Impact Area 4, sheet 2-F, showing the
plan details and section view of the level spreader was omitted from the
submittal. Please include this sheet in the resubmittal. In addition,
please show plan details of the proposed flow splitting devise.
We have included plan Sheet 2-F showing the details for both the
concrete level spreader (detail 9) and rip rap forebay (detail 12). Also, a
flow splitter device detail has been added to plan sheet 8 which is
included with this submittal.
All stormwater discharged in the vicinity of Impact Area 3, must be
discharged through a correctly designed level spreader or scour hole per
the requirements of the Neuse Buffer Rule. Level spreader design
requirements are set forth in Chapter 8 of the NC Stormwater BMP
Manual.
The preformed scour hole at 58+95 -L- (LT) is correctly designed per the
requirements of the Neuse Buffer Rule. The slope from the lip of the
preformed scour hole to the top of bank of the receiving stream is less
than 2%. Calculations for this level spreader have been provided per
comment 4. A preformed scour hole has also been added at 60+25 -L-
(RT) to treat and dissipate the runoff collecting in the swale created
between the roadway embankment and natural ground from 60+25 to
61+50 (RT).
4. For every scour hole that is proposed on the project, please provide the
following information:
a. The drainage area and impervious surface area draining the
devise,
b. The peak flow from the 1 in./hr and 10 year storms,
c. The elevation of the natural ground at the locations of the scour
hole and the top of bank of the receiving stream,
d. The slope of the filter strip,
e. Plan details of the scour hole that include the dimensions, one
foot topo lines between the device and the top of bank, and
f. A signed and notarized Operation and Maintenance Agreement.
The information requested for the preformed scour holes has been
provided. The Operation and Maintenance Agreement forms for "Filter
Strip, Restored Riparian Buffer and Level Spreader" were used for the
preformed scour holes, since there was not one available online
specifically for preformed scour holes. Maintenance agreements were
? ? ? Kimley-Horn
and Associates, Inc.
provided for each impact area that contains BMP's. The BMP's each
maintenance agreement covers is listed on page 3.
5. For every proposed discharge to a wetland on the site, please provide
details of the proposed dissipation devices. In addition, provide
supporting calculations that show the device has been designed to limit
the velocity of stormwater to less than two feet per second during the
peak flow from the ten-year storm.
Calculations for the rip rap dissipation pads at the outfalls of the cross
pipes at stations 22+70 and 75+20 have been provided. They have been
designed to limit the velocity of the storm water to less than two feet per
second during the I0-year storm. Detail 17 on sheet 2-F has been added
for the outlet dissipation pads. In five additional areas check dams have
been placed in grassed swales that are discharging to a wetland. These
check dams will ensure the velocity of storm water entering the wetland
will be less than 2 feet per second.
As requested in your letter, 5 copies of all additional information are being
provided herein.
If there is any additional information you need to assist in the processing of this
application, please do not hesitate to contact me at [phone].
Very truly yours,
KIMLEY- A D SSOCIATES, INC.
Todd J T ell
Envir nmental Scien *st
Enclosures
Cc: Mr. Jay Meyers, Public Utilities Director
Attachment A - Revised Permit Figures and Impact Table
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Attachment B - Bio Retention and Diffuse Flow Calculations
Permit Number:
(to be provided by DWQ)
o`'aF wArF9oc
NCDENR °
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
BIORETENTION CELL SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part III) must be printed, filled out and submitted along with all of the required information.
L PROJECT INFORMATION
Project name NE Judd Parkway Extenstion
Contact name Matt West
Phone number 919-678-4194
Date April 20, 2009
Drainage area number STA 65+50 -L- LT
II. DESIGN INFORMATION
Site Characteristics
Drainage area 12,676 ff
Impervious area 1,089 ff
Percent impervious 8.6% %
Design rainfall depth 1.0 inch
Peak Flow Calculations
Is pre/post control of the 1-yr, 24-hr peak flow required? N (Y or N)
1-yr, 24-hr runoff depth in
1-yr, 24-hr intensity in/hr
Pre-development 1-yr, 24-hr peak flow ft3/sec
Post-development 1-yr, 24-hr peak flow ft3/sec
Pre/Post 1-yr, 24-hr peak control ft3/sec
Storage Volume: Non-SA Waters
Minimum volume required 193.0 ff3
Volume provided 416.0 ft3 OK
Storage Volume: SA Waters
1.5" runoff volume ff3
Pre-development 1-yr, 24-hr runoff ff3
Post-development 1-yr, 24-hr runoff ft3
Minimum volume required 0 ff3
Volume provided ft3
Cell Dimensions
Ponding depth of water 9 inches OK
Ponding depth of water 0.75 ft
Surface area of the top of the bioretention cell 554.0 fe OK
Length: 50 ft OK
Width: 18 ft OK
-or- Radius ft
Media and Soils Summary
Drawdown time, ponded volume 4.5 hr OK
Drawdown time, to 24 inches below surface 16.5 hr OK
Drawdown time, total: 21 hr
In-situ soil.
Soil permeability in/hr
Planting media soil.
Soil permeability 2.00 in/hr OK
Soil composition
Sand (by weight) 88% OK
% Fines (by weight) 8% OK
Organic (by weight) 4% OK
Total: 100%
Phosphorus Index (P-Index) of media 20 (unitless) OK
Form SW401-Bioretention-Rev.7 Parts I and II. Design Summary, Page 2 of 4
Permit Number:
(to be provided by DWQ)
Basin Elevations
Temporary pool elevation
Type of bioretention cell (answer "Y" to only one of the two
following questions):
Is this a grassed cell?
Is this a cell with trees/shrubs?
Planting elevation (top of the mulch or grass sod layer)
Depth of mulch
Bottom of the planting media soil
Planting media depth
Depth of washed sand below planting media soil
373.75 fmsl
Y (Y or N) OK
N (Y or N)
373 fmsl
36 inches Insufficient mulch depth, unless installing grassed cell.
370 fmsl
3ft
0.33 ft
Are underdrains being installed?
How many clean out pipes are being installed?
What factor of safety is used for sizing the underdrains? (See
BMP Manual Section 12.3.6)
Additional distance between the bottom of the planting media and
the bottom of the cell to account for underdrains
Bottom of the cell required
SHWT elevation
Distance from bottom to SHWT
Planting Plan
Number of tree species
Number of shrub species
Number of herbaceous groundcover species
Additional Information
Does volume in excess of the design volume bypass the
bioretention cell?
Does volume in excess of the design volume flow evenly
distributed through a vegetated filter?
What is the length of the vegetated filter?
Does the design use a level spreader to evenly distribute flow?
Is the BMP located at least 30 feet from surface waters (50 feet if
SA waters)?
Is the BMP localed at least 100 feet from water supply wells?
Are the vegetated side slopes equal to or less than 3:1?
Is the BMP located in a proposed drainage easement with access
to a public Right of Way (ROW)?
Inlet velocity (from treatment system)
Is the area surrounding the cell likely to undergo development in
the future?
Are the slopes draining to the bioretention cell greater than 20%?
Is the drainage area permanently stabilized?
Pretreatment Used
(Indicate Type Used with an "X" in the shaded cell)
Gravel and grass
(8`inches gravel followed by 3-5 ft of grass)
Grassed swale
Forebay
Other
Form SW401-Bioretention-Rev.7
N (Y or N) The permeability of the planting media is greater than the
permeability of the in-situ soil. Must have method for draining cell.
Oft
369.67 fmsl
365 fmsl
4.67 ft OK
0
0
3 OK
Y (Y or N) OK
Y (Y or N) OK
121 ft
N (Y or N) Show how flow is evenly distributed.
Y (Y or N) OK
Y (Y or N) OK
Y (Y or N) OK
Y (Y or N) OK
I ft/sec OK
N (Y or N) OK
N (Y or N) OK
Y (Y or N) OK
X
X OK
Parts I and 11. Design Summary, Page 3 of 4
Permit No:
(to be assigned by DWQ)
Ill. REQUIRED ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
Initials Sheet No.
1. Plans (1" - 50' or larger) of the entire site showing:
Design at ultimate build-out,
Off-site drainage (if applicable),
Delineated drainage basins (include Rational C coefficient per basin),
Cell dimensions,
Pretreatment system,
High flow bypass system,
Maintenance access,
Recorded drainage easement and public right of way (ROW),
Clean out pipe locations,
Overflow device, and
Boundaries of drainage easement.
Z 2. Plan details (1" = 30' or larger) for the bioretention cell showing:
Cell dimensions
Pretreatment system,
High flow bypass system,
Maintenance access,
Recorded drainage easement and public right of way (ROW),
Design at ultimate build-out,
Off-site drainage (if applicable),
Clean out pipe locations,
Overflow device, and
Boundaries of drainage easement.
Indicate the P-Index between 10 and 30
Z- E
A0 AltA
R,'o pe f-e0h'ai'l
Hat, rn>< 1 ?-r?t k
fth f•fl/t Sd+?s
3. Section view of the bioretention cell (1" = 20' or larger) showing:
Side slopes, 3:1 or lower
Underdrain system (if applicable), and
Bioretention cell layers [ground level and slope, pre-treatment, ponding depth, mulch depth, fill media
depth, washed sand, filter fabric (or choking stone if applicable), #57 stone, underdrains (if applicable),
SHWT level(s), and overflow structure)
4. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. The
results of the soils report must be verified in the field by DWQ, by completing & submitting the soils
dOt^$ investigation request form. County soil maps are not an acceptable source of soils information. All
10 elevations shall be in feet mean sea level (fmsl). Results of soils tests of both the planting soil and the in
situ soil must include:
Soil permeability,
Soil composition (% sand, % fines, % organic), and

- P-index.
N -#/R
3.o Re fthhbtit
DW
ireC.kc-l"6hf
?Z1Rta+?
?1?fkcNE9
`I1RcK?

5. A detailed planting plan (1" = 20' or larger) prepared by a qualified individual showing:
A variety of suitable species,
Sizes, spacing and locations of plantings,
Total quantity of each type of plant specified,
A planting detail,
The source nursery for the plants, and
Fertilizer and watering requirements to establish vegetation.
6. An assurance that the installed system will meet design specifications upon initial operation once the
project is complete and the entire drainage area is stabilized.
7. A construction sequence that shows how the bioretention cell will be protected from sediment until the
entire drainage area is stabilized.
8. The supporting calculations (including underdrain calculations, if applicable).
9. A copy of the signed and notarized inspection and maintenance (I&M) agreement.
10. A copy of the deed restriction.
Form SW401-Bioretention-Rev.7 Part III, Page 1 of 1
C•/1 iumMy nom
BIO-RETENTION AREA STA 65+50 LT DESIGN SHEET
Project Information
Project Name: NE Judd Pkwy
KHA Project #:
Designed by: CAD Date: 4115/2009
Revised by: Date:
Checked by: JL Date: 4R1/20D9
Design Notes:
Per the July 2007 BMP Manual sizing is based on the Site Runoff Volume for the first inch of runoff.
1. Runoff Depth Methodology (BMP Manual SCS Sizing Criteria)
Runoff Depth (in.) = (P-0.2S)^21(P+0.8S)
S=1000/CN - 10
CN=Curve number
Total DA to Bioretention System:
CN value
Area CN Composite
(acres) CN
Impervious Area 0.025 98 8
Pervious Area 0.266 49 45 'Open Space, Good Condition C Soil Group
IMPERVIOUS AREA
P= Precipitation (in.) = 1.00 in. (first flush)
Drainage Area = 0.03 ac ( 1,089 sf )
Desired depression depth = 9.00 in.
CN = 98
Water Quality
therefore, S = 0.20
Runoff depth = 0.79 in.
Runoff Volume = 861 sf-in 72 cf (VJ
Total Runoff Volume = 2315 sf-in 193 cf (Vd
PERVIOUS AREA
P= Precipitation (in.) = 1.00 in. (first flush)
Drainage Area = 0.27 ac 11,587 sf )
Desired depression depth = 9.00 in.
CN = 49
therefore, S = 10.41
Runoff depth = 0.13 in.
Runoff Volume = 1453 sf-in 121 cf (V.)
Required SA-- 257 sf
Provided SA= 554 sf
II. Bio-retention Depth and Soil Type
Minimum depth of bio-retention area = 3 ft
Conductive of Bio•Soil Mix Site Soil Conducth i
Soil Conductive K Soil Conductiv'
(in/hr) iNhr
Sand 6 N/A
Loam Sand 2
Sandy Loam 0.5 - 1
K„e = 2.0 (conservat ive)
V Water
Fill Soil Layer- With Set Hydraulic
Conductivity (K). K expected to range 0 H
from 0.5 to 6 in/hr (1-2 iNhr TYP) TA L
Existing Ground, Sloped toward Ouffall
III. Calculate Water Draw Throuoh Rate
Q(CfS) = (2.3E-5)-K.WA-H1L
Where:
Q = Flow (Rate of draw) through Bio-Retention Soil (cfs)
K„9 = Hydraulic Conductivity of Soil (iNhr)
A = Surface Area of Bio-Retention Area (sf)
H = Height of water above gravel envelope/drainage pipe zone
L = Thicknes of Soil (as determined above)
K_= 2.0 in/hr
A = 554 sf
H' = 3.75 it
L' = 3.0 h
unless L is small, such as 2.0 feet), allow HIL =1
Q= 0.03 cfs
Find time to drawdown water from inundation to saturation at surface:
Bioretention Volume (V,-r) = SA x Depression Depth
V,r= 416cf
1 of3

BIO-RETENTION AREA STA 65+50 LT DESIGN SHEET
Project Information
Project Name: NE Judd Pkwy
KHA Project #:
Designed by: CAD Date: 4/15/2009
Revised by: Date:
Checked by JL Date: 4/21/2009
Time to remove V,., of water at tiowrate, Q
T.., = V4./Q
T,., = 13043 seconds
T,.,= 3.62 hours
Time to drawdown water from saturation at surface to X feet below surface:
Porosity, n = 0.45
X= 3.0 ft
Calculate volume of water to drawdown in 4 feet of soil:
V.., = X (N)' SA' n
V. 2 = 748 cf
Time to remove water from V,.,:
T- = V,_,!Q
T- = 23478 seconds
T_ = 6.52 hours
Total time to draw water through soil:
Time = T,., + T.,
Drawdown Time = 10.14 hours
2 of3
NE Judd Parkway Extension
KIRA Job #: 012622001
Bio-Retention Construction Sequence
1. Excavate roadside ditches and place temporary seeding as standard during construction.
2. Ensure that bio-retention terrace areas are stable before beginning construction.
3. Begin construction of bio-retention area by placing rip rap dam at the downstream end of
the terraces and the rip rap dissipater at the upstream location of the terraces.
4. Add bio-retention soil mixture as described in Detail 18 on plan sheet 2-E.
5. After the bio-retention area has been final graded, lay sod as described in Detail 18 on
plan sheet 2-E.
Permit Number:
(to be provided by DWQ)
NAA O?DF WAT f; Q
? y
NCDENR Y
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
BIORETENTION CELL SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part III) must be printed, filled out and submitted along with all of the required information.
L PROJECT INFORMATION
Project name NE Judd Parkway Extenstion
Contact name Matt West
Phone number 919-678-4194
Date April 20, 2009
Drainage area number STA 65+00 -L- RT
II. DESIGN INFORMATION
Site Characteristics
Drainage area 29,185 f 2
Impervious area 9,583 f?
Percent impervious 32.8% %
Design rainfall depth 1.0 inch
Peak Flow Calculations
Is pre/post control of the 1-yr, 24-hr peak flow required? N (Y or N)
1-yr, 24-hr runoff depth in
1-yr, 24-hr intensity in/hr
Pre-development 1-yr, 24-hr peak flow ff3/sec
Post-development 1-yr, 24-hr peak flow ft3/sec
Pre/Post 1-yr, 24-hr peak control ft3/sec
Storage Volume: Non-SA Waters
Minimum volume required 837.0 ft3
Volume provided 1,038.0 ft3 OK
Storage Volume: SA Waters
1.5" runoff volume ft3
Pre-development 1-yr, 24-hr runoff ft3
Post-development 1-yr, 24-hr runoff ft3
Minimum volume required 0 ft3
Volume provided ft3
Cell Dimensions
Ponding depth of water 9 inches OK
Ponding depth of water 0.75 ft
Surface area of the top of the bioretention cell 1,384.0 ftz OK
Length: 115 ft OK
Width: 18 ft OK
-or- Radius ft
Media and Soils Summary
Drawdown time, ponded volume 4.5 hr OK
Drawdown time, to 24 inches below surface 16.5 hr OK
Drawdown time, total: 21 hr
In-situ soil:
Soil permeability in/hr
Planting media soil:
Soil permeability 2.00 in/hr OK
Soil composition
Sand (by weight) 88% OK
Fines (by weight) 8% OK
Organic (by weight) 4% OK
Total: 100%
Phosphorus Index (P-Index) of media 20 (unitless) OK
Form SW401-Bioretention-Rev.7 Parts I and H. Design Summary, Page 2 of 4
Permit Number:
(to be provided by DWO)
Basin Elevations
Temporary pool elevation
Type of bioretention cell (answer "Y" to only one of the two
following questions):
Is this a grassed cell?
Is this a cell with trees/shrubs?
Planting elevation (top of the mulch or grass sod layer)
Depth of mulch
Bottom of the planting media soil
Planting media depth
Depth of washed sand below planting media soil
373.35 fmsl
Y (Y or N) OK
N (Y or N)
372.6 fmsl
36 inches Insufficient mulch depth, unless installing grassed cell.
369.6 fmsl
3ft
0.33 ft
Are underdrains being installed?
How many clean out pipes are being installed?
What factor of safety is used for sizing the underdrains? (See
BMP Manual Section 12.3.6)
Additional distance between the bottom of the planting media and
the bottom of the cell to account for underdrains
Bottom of the cell required
SHWT elevation
Distance from bottom to SHWT
Planting Plan
Number of tree species
Number of shrub species
Number of herbaceous groundcover species
Additional Information
Does volume in excess of the design volume bypass the
bioretention cell?
Does volume in excess of the design volume flow evenly
distributed through a vegetated filter?
What is the length of the vegetated filter?
Does the design use a level spreader to evenly distribute flow?
Is the BMP located at least 30 feet from surface waters (50 feet if
SA waters)?
Is the BMP localed at least 100 feet from water supply wells?
Are the vegetated side slopes equal to or less than 3:1?
Is the BMP located in a proposed drainage easement with access
to a public Right of Way (ROW)?
Inlet velocity (from treatment system)
Is the area surrounding the cell likely to undergo development in
the future?
Are the slopes draining to the bioretention cell greater than 20%?
Is the drainage area permanently stabilized?
Pretreatment Used
(Indicate Type Used with an "X" in the shaded cell)
Gravel and grass
(8'inches gravel followed by 3-5 ft of grass)
Grassed swale
Forebay
Other
Form SW401-Bioretention-Rev.7
N (Y or N) The permeability of the planting media is greater than the
permeability of the in-situ soil. Must have method for draining cell.
Oft
369.27 fmsl
365 fmsl
4.27 it OK
3 OK
Y (Y or N) OK
Y (Y or N) OK
82 ft
N (Y or N) Show how flow is evenly distributed.
Y (Y or N) OK
Y (Y or N) OK
Y (Y or N) OK
Y (Y or N) OK
1 fYsec OK
N (Y or N) OK
N (Y or N) OK
Y (Y or N) OK
X
X OK
Parts I and 11. Design Summary, Page 3 of 4
Permit No:
(to be assigned by DWQ)
III. REQUIRED ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Page/ Plan
Initials Sheet No.
$ 1. Plans (1" - 50' or larger) of the entire site showing:
Design at ultimate build-out,
Off-site drainage (if applicable),
Delineated drainage basins (include Rational C coefficient per basin),
Cell dimensions,
Pretreatment system,
High flow bypass system,
Maintenance access,
Recorded drainage easement and public right of way (ROW),
Clean out pipe locations,
Overflow device, and
Boundaries of drainage easement.
2. Plan details (1" = 30' or larger) for the bioretention cell showing:
Cell dimensions
Pretreatment system,
High flow bypass system,
Maintenance access,
Recorded drainage easement and public right of way (ROW),
Design at ultimate build-out,
Off-site drainage (if applicable),
Clean out pipe locations,
Overflow device, and
Boundaries of drainage easement.
Indicate the P-Index between 10 and 30
Z- E 3. Section view of the bioretention cell (1"= 20' or larger) showing:
Side slopes, 3:1 or lower
Underdrain system (if applicable), and
Bioretention cell layers [ground level and slope, pre-treatment, ponding depth, mulch depth, fill media
depth, washed sand, filter fabric (or choking stone if applicable), #57 stone, underdrains (if applicable),

(• (?/ J?/? SHWT level(s), and overflow structure]
4. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. The
/?
r2-
results Qt{tNf Ow(s results of the soils report must be verified in the field by DWO, by completing & submitting the soils
i
ti
ti
t f
il
C
nves
ga
on reques
orm.
ounty so
maps are not an acceptable source of soils information. All
?? % 60 elevations shall be in feet mean sea level (fmsl). Results of soils tests of both the planting soil and the in
IPA
)
)(A situ soil must include:
Soil permeability,
Soil composition (% sand, % fines, % organic), and

L
( P-index.
l ?,
J 5. A detailed planting plan (1" = 20' or larger) prepared by a qualified individual showing:
Vbd? rj A variety of suitable species,
R? n
w' q Sizes, spacing and locations of plantings,
T
tit
t
l
f
h t
f
l
ifi
d
?? w V o
a
quan
y o
eac
ype o
p
ant spec
e
,
/
` A planting detail,
7
S j The source nursery for the plants, and
Fertilizer and watering requirements to establish vegetation.
J
6. An assurance that the installed system will meet design specifications upon initial operation once the
project is complete and the entire drainage area is stabilized.
i 7. A construction sequence that shows how the bioretention cell will be protected from sediment until the
entire drainage area is stabilized.
I _ 8. The supporting calculations (including underdrain calculations, if applicable).
t C'tE`? 9. A copy of the signed and notarized inspection and maintenance (I&M) agreement.
10. A copy of the deed restriction.
Form SW401-Bioretenbon-Rev.7 Part III, Page 4 of 4
Kime bm
d ASOCblas, kc
r-an
BIO-RETENTION AREA STA 65+00 RT DESIGN SHEET
Project Information
Project Name: NE Judd Pkwy
KHA Project #:
Designed by: CAD Date: 4/1512009
Revised by: Date:
Checked by: JL Date: 412212009
Design Notes:
• Per the July 2007 BMP Manual sizing is based on the Site Runoff Volume for the first inch of runoff.
1. Runoff Depth Methodology (BMP Manual SCS Sizing Criteria)
Runoff Depth (in.) = (P-0.2S)"2/(P+0.8S)
S=1000/CN - 10
CN=Curve number
Total DA to Bioretention System:
CN value
Area CN Composite
(acres) CN
Impervious Area 0.220 98 32
Pervious Area 0.45 49 33 'Open Space, Good Condition C Soii Group
Total 65
IMPERVIOUS AREA
P= Precipitation (in.) = 1.00 in. (first flush)
Drainage Area = 0.22 ac ( 9,583 sf )
Desired depression depth = 9.00 in.
CN = 98
therefore, S = 0.20
Runoff depth = 0.79 in.
Runoff Volume = 7579 sf-in 632 cf (VJ
PERVIOUS AREA
P= Precipitation (in.) = 1.00 in. (first flush)
Drainage Area = 0.45 ac 19,602 sf )
Desired depression depth = 9.00 in.
CN = 49
therefore, S= 10.41
Runoff depth = 0.13 in.
Runoff Volume = 2459 sf-in 205 cf (V.)
Water Quality
Total Runoff Volume = 10038 sf-in 837 cf (Vo)
Required SA= 1,115 sf
Provided SA= 1,363 sf
II. Bio-retention Depth and Soil Type
Minimum depth of bio-retention area = 3 it
Conductivity of Blo-Soil Mix Site Soil Conductivity
Soil Conductivity K Soil Conductivity'
Nhr iNhr
Sand 6 UrC 6.31
Loam Sand 2 Based on 44.5 pm/sec from physical soil properties
Sand Loam 0.5 - 1 Used 44.5 pm/sec to be conservative. Underdrains to be used to drain
bioretention area Bio-soil
K..a = 2.0 (conservative)
V Water
Fill Soil Layer- With Set Hydraulic
Conductivity (K). K expected to range H
from 0.5 to 6 in/hr (1-2 in/hr TYP) Q L
Existing Ground, Sloped toward Ouffall
III. Calculate Water Draw Through Rate
Q(cfs) = (2.3E-5)'K„9•A'H/L
Where:
Q = Flow (Rate of draw) through Bio-Retention Soil (cfs)
K_ = Hydraulic Conductivity of Soil (iNhr)
A = Surface Area of Bio-Retention Area (sf)
H = Height of water above gravel envelope/drainage pipe zone
L = Thicknes of Soil (as determined above)
K,ro= 2.0 in/hr
A= 1,363 sf
H' = 3.75 ft
L' = 3.0 it
unless L is small, such as 2.0 feet), allow HIL = 1
Q= 0.08 cis
Find time to drawdown water from inundation to saturation at surface:
Bioretention Volume (V,.,) = SA x Depression Depth
V., = 1,022 ct
1 of 3
??? vd woee?es.u?
BIO-RETENTION AREA STA 65+00 RT DESIGN SHEET
Project Information
Project Name: NE Judd Pkwy
KHA Project M
Designed by: CAD Date: 4/1512009
Revised by: Date: --
Checked by: JL Date: 4122/2009
Time to remove V,., of water at flowrate, Q
T,., = VF,/Q
T,., = 13043 seconds
T,., = 3.62 hours
Time to drawdown water from saturation at surface to X feet below surface:
Porosity, n = 0.45
X = 3.0 it
Calculate volume of water to drawdown in 4 feet of soil:
V,.2 = X (ft) - SA' n
V,_2 = 1840 cf
Time to remove water from V,.,:
T., = V,.,1Q
T,.2 = 23478 seconds
T,.2 = 6.52 hours
Total time to draw water through soil:
Time = T,., + T,.2
Drawdown Time = 10.14 hours
2 of3
NE Judd Parkway Extension
KHA Job #: 012622001
Bio-Retention Construction Sequence
1. Excavate roadside ditches and place temporary seeding as standard during construction.
2. Ensure that bio-retention terrace areas are stable before beginning construction.
3. Begin construction of bio-retention area by placing rip rap dam at the downstream end of
the terraces and the rip rap dissipater at the upstream location of the terraces.
4. Add bio-retention soil mixture as described in Detail 18 on plan sheet 2-E.
5. After the bio-retention area has been final graded, lay sod as described in Detail 18 on
plan sheet 2-E.
??? KimleyHorn
and Associates, Inc.
Job--)yZp Subject
Designed by Date ? ° '6 Checked by
Sheet No. of
Job No.
Date

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Attachment C - Operation and Maintenance Agreements
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Bioretention Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important operation and maintenance procedures:
- Immediately after the bioretention cell is established, the plants will be watered
twice weekly if needed until the plants become established (commonly six
weeks).
- Snow, mulch or any other material will NEVER be piled on the surface of the
bioretention cell.
- Heavy equipment will NEVER be driven over the bioretention cell.
- Special care will be taken to prevent sediment from entering the bioretention cell.
- Once a year, a soil test of the soil media will be conducted.
After the bioretention cell is established, I will inspect it once a month and within 24
hours after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal
County). Records of operation and maintenance will be kept in a known set location
and will be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problems: How I will remediate the problem:
The entire BMP Trash/ debris is resent. Remove the trash/ debris.
The perimeter of the Areas of bare soil and/or Regrade the soil if necessary to
bioretention cell erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
The inlet device: pipe, The pipe is clogged (if Unclog the pipe. Dispose of the
stone verge or Swale applicable). sediment off-site.
The pipe is cracked or Replace the pipe.
otherwise damaged (if
applicable).
Erosion is occurring in the Regrade the swale if necessary to
swale (if applicable). smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
Stone verge is clogged or Remove sediment and clogged
covered in sediment (if stone and replace with clean stone.
a licable .
Form SW401-Bioretention O&M-Rev.3 Page 1 of 4
BMP element: Potential problems: How I will remediate the problem:
The pretreatment area Flow is bypassing Regrade if necessary to route all
pretreatment area and/or flow to the pretreatment area.
hies have formed. Restabilize the area after grading.
Sediment has accumulated to Search for the source of the
a depth greater than three sediment and remedy the problem if
inches. possible. Remove the sediment and
restabilize the pretreatment area.
Erosion has occurred. Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
prevent future erosion problems.
Weeds are present. Remove the weeds, preferably by
hand.
The bioretention cell: Best professional practices Prune according to best professional
vegetation show that pruning is needed practices.
to maintain optimal plant
health.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application to establish the
ground cover if a soil test indicates
it is necessary.
Tree stakes/ wires are present Remove tree stake/ wires (which
six months after planting. can kill the tree if not removed).
The bioretention cell: Mulch is breaking down or Spot mulch if there are only random
soils and mulch has floated away. void areas. Replace whole mulch
layer if necessary. Remove the
remaining much and replace with
triple shredded hard wood mulch at
a maximum depth of three inches.
Soils and/or mulch are Determine the extent of the clogging
clogged with sediment. - remove and replace either just the
top layers or the entire media as
needed. Dispose of the spoil in an
appropriate off-site location. Use
triple shredded hard wood mulch at
a maximum depth of three inches.
Search for the source of the
sediment and remedy the problem if
possible.
An annual soil test shows that Dolomitic lime shall be applied as
pH has dropped or heavy recommended per the soil test and
metals have accumulated in toxic soils shall be removed,
the soil media. disposed of properly and replaced
with new planting media.
Form SW401-Bioretention O&M-Rev.3 Page 2 of 4
Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name: NE Judd Parkway Extension
BMP drainage area numberTermit Impact Site # 4 (Bio-Retention Terraces at 65+00 -L-
RT and at 65+50 -L- L'
Print name:Town of Fuquay-Varina
Title:Town Manager - Andy Hedrick
Address:401 Old Honeycutt Road, Fuquay-Varina, NC 27526
Phone: [phone]
Signature:
Date: 119
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.
a Notary Public for the State of
County of do hereby certify that
personally appeared before me this a
day of and acknowledge the due execution of the
forgoing bioretention maintenance requirements. Witness my hand and official seal,
?4F ??Y T. T9?
oL
tAOTA/q y
? • AUBLIG
V
SEAL
My commission expire A\L)
Form SW401-Bioretention I&M-Rev. 2 Page 4 of 4
BMP element: Potential problems: How I will remediate the problem:
The underdrain system Clogging has occurred. Wash out the underdrain system.
if applicable)
The drop inlet Clogging has occurred. Clean out the drop inlet. Dispose of
the sediment off-site.
The drop inlet is damaged Repair or replace the drop inlet.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality 401 Oversight Unit at 919-
outlet. 733-1786.
Form SW401-Bioretention O&M-Rev.3 Page 3 of 4
-rMrac+ s;-k-- #?
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Filter Strip, Restored Riparian Buffer and Level Spreader
Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important maintenance procedures:
- Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
- Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
- Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
- Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC,1993). Forested filter strips do not require this type of maintenance.
- Once a year, the soil will be aerated if necessary.
- Once a year, soil pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will remediate the problem:
The entire filter strip Trash/debris is present. Remove the trash/ debris.
system
The flow splitter device The flow sputter device is Unclog the conveyance and dispose
(if applicable) clogged. of an sediment off-site.
The flow splitter device is Make any necessary repairs or
damaged. replace if damage is too large for
repair.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 1 of 4
BMP element: Potential problem: How I will remediate the problem:
The swale and the level The swale is clogged with Remove the sediment and dispose
lip sediment. of it off-site.
The level lip is cracked, Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the Regrade the soil to create a berm
end of the level spreader that that is higher than the level lip, and
shows stormwater has then plant a ground cover and
bypassed it. water until it is established. Provide
lime and a one-time fertilizer
application.
Trees or shrubs have begun Remove them.
to grow on the swale or just
downslo a of the level lip.
The bypass channel Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then
reestablish proper erosion control.
Turf reinforcement is Study the site to see if a larger
damaged or ripap is rolling bypass channel is needed (enlarge if
downhill. necessary). After this, reestablish
the erosion control material.
The filter strip Grass is too short or too long Maintain grass at a height of
if applicable). approximately three to six inches.
Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
Sediment is building up on Remove the sediment and
the filter strip. restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application.
Plants are desiccated. Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application.
Nuisance vegetation is Remove vegetation by hand if
choking out desirable species. possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality local Regional Office, or the
outlet. 401 Oversight Unit at 919-733-1786.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 2 of 4
Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name: NE Judd Parkway Extension
BMP drainage area numberTermit Impact Site # 3 (Preformed Scour Holes at 58+95 -L-
LT and 60+25 -L- R'
Print name:Town of Fuquay-Varina
Title:Town Manager - Andy Hedrick
Address:401 Old Honeycutt Road, Fuquay-Varina, NC 27526
Phone: [phone]
Signature: 6--. o/1
U
Date:
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president. '?'41
I, , a Notary Public for the State of
Nor-l Ga r,9bAA__ , County of tt/o ?j i._ , do hereby certify that
Andy 6?do c ,-, personally appeared before me this 2q
day of A ri 1 240 , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
t?0TA r y
v
(CIOU tZ
SEAL
My commission expire I' r G
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 4

Permit Number:
(to be provided by DWQ)
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev-3 Page 4 of 4
zo,r.o? 514. *-41
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Filter Strip, Restored Riparian Buffer and Level Spreader
Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important maintenance procedures:
- Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
- Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
- Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
- Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC,1993). Forested filter strips do not require this type of maintenance.
- Once a year, the soil will be aerated if necessary.
- Once a year, soil pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will remediate the problem:
The entire filter strip Trash/ debris is present. Remove the trash/debris.
system
The flow splitter device The flow sputter device is Unclog the conveyance and dispose
(if applicable) clogged. of an sediment off-site.
The flow splitter device is Make any necessary repairs or
damaged. replace if damage is too large for
re air.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 1 of 4
BMP element: Potential problem: How I will remediate the problem:
The Swale and the level The swale is clogged with Remove the sediment and dispose
lip sediment. of it off-site.
The level lip is cracked, Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the Regrade the soil to create a berm
end of the level spreader that that is higher than the level lip, and
shows stormwater has then plant a ground cover and
bypassed it. water until it is established. Provide
lime and a one-time fertilizer
application.
Trees or shrubs have begun Remove them.
to grow on the swale or just
downslo a of the level lip.
The bypass channel Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then
reestablish proper erosion control.
Turf reinforcement is Study the site to see if a larger
damaged or ripap is rolling bypass channel is needed (enlarge if
downhill. necessary). After this, reestablish
the erosion control material.
The filter strip Grass is too short or too long Maintain grass at a height of
if applicable). approximately three to six inches.
Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
Sediment is building up on Remove the sediment and
the filter strip. restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application.
Plants are desiccated. Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application. •
Nuisance vegetation is Remove vegetation by hand if
choking out desirable species. possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality local Regional Office, or the
outlet. 401 Oversight Unit at 919-733-1786.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 2 of 4
Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name: NE Judd Parkway Extension
BMP drainage area numberTermit Impact Site # 4 (Preformed Scour Hole at 67+60 -L-
RT and Level Spreader at 67+65 -L- LT)
Print name:Town of Fugua_y-Varina
Title:Town Manager - Andy Hedrick
Address:401 Old Honeycutt Road, Fuquay-Varina, NC 27526
Phone:
Signah
Date: y/.Z y10 R
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, (?4tCC*14_ C? LR 1 , a Notary Public for the State of
nlof-M ect,#Bb;?e:L_ , County of i6&k e_-. , do hereby certify that
Q4dt e t c personally appeared before me this.244-
day of Z , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
e, P'W T 791 F
NOTARY
SEAL
My commission expire 4"" ac
?
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 4
Permit Number:
(to be provided by DWQ)
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 4 of 4
:ZIA 5 ITS
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Filter Strip, Restored Riparian Buffer and Level Spreader
Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important maintenance procedures:
- Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
- Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
- Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
- Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC,1993). Forested filter strips do not require this type of maintenance.
- Once a year, the soil will be aerated if necessary.
- Once a year, soil pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will reinediate the problem:
The entire filter strip Trash/ debris is present. Remove the trash/debris.
system
The flow splitter device The flow sputter device is Unclog the conveyance and dispose
(if applicable) clogged. of an sediment off-site.
The flow splitter device is Make any necessary repairs or
damaged. replace if damage is too large for
repair.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 1 of 4
BMP element: Potential problem: How I will remediate the problem:
The Swale and the level The swale is clogged with Remove the sediment and dispose
lip sediment. of it off-site.
The level lip is cracked, Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the Regrade the soil to create a berm
end of the level spreader that that is higher than the level lip, and
shows stormwater has then plant a ground cover and
bypassed it. water until it is established. Provide
lime and a one-time fertilizer
application.
Trees or shrubs have begun Remove them.
to grow on the swale or just
downslo a of the level lip.
The bypass channel Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then
reestablish proper erosion control.
Turf reinforcement is Study the site to see if a larger
damaged or ripap is rolling bypass channel is needed (enlarge if
downhill. necessary). After this, reestablish
the erosion control material.
The filter strip Grass is too short or too long Maintain grass at a height of
if applicable). approximately three to six inches.
Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
Sediment is building up on Remove the sediment and
the filter strip. restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application.
Plants are desiccated. Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application.
Nuisance vegetation is Remove vegetation by hand if
choking out desirable species. possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality local Regional Office, or the
outlet. 401 Oversight Unit at 919-733-1786.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 2 of 4
Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name: NE Judd Parkway Extension
BMP drainage area number:Permit Impact Site # 5 (Preformed Scour Hole at 76+78 -L-
RJTI
Print name:Town of Fuqug -Varina
Title:Town Manager - Andy Hedrick
Address:401 Old Honeycutt Road, Fuquay-Varina, NC 27526
Signature:
Date: `//2 ?ZO
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, ??44LW Q:Q (%- I ? , a Notary Public for the State of
NOl1 ear0 I ill o? , ounty of do hereby certify that
Vil C_ I
A4d y Hodr i c. l '-, personally appeared before me this
day of x , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements
Witness my hand and official seal,
N? OY 7.
T9\
F
NOTA,
iOt f3 LXG
COUI
SEAL
My commission expired
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 4
Permit Number:
(to be provided by DWQ)
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 4 of 4
I Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Filter Strip, Restored Riparian Buffer and Level Spreader
Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important maintenance procedures:
- Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
- Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
- Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC,1993). Forested filter strips do not require this type of maintenance.
Once a year, the soil will be aerated if necessary.
Once a year, soil pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will remediate the problem:
The entire filter strip Trash/debris is present. Remove the trash/debris.
system
The flow splitter device The flow splitter device is Unclog the conveyance and dispose
(if applicable) clogged. of an sediment off-site.
The flow splitter device is Make any necessary repairs or
damaged. replace if damage is too large for
repair.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page I of 4
BMP element: Potential problem: How I will remediate the problem:
The swale and the level The swale is clogged with Remove the sediment and dispose
lip sediment. of it off-site.
The level lip is cracked, Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the Regrade the soil to create a berm
end of the level spreader that that is higher than the level lip, and
shows stormwater has then plant a ground cover and
bypassed it. water until it is established. Provide
lime and a one-time fertilizer
application.
Trees or shrubs have begun Remove them.
to grow on the swale or just
downslo a of the level lip.
The bypass channel Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then
reestablish proper erosion control.
Turf reinforcement is Study the site to see if a larger
damaged or ripap is rolling bypass channel is needed (enlarge if
downhill. necessary). After this, reestablish
the erosion control material.
The filter strip Grass is too short or too long Maintain grass at a height of
if applicable). approximately three to six inches.
Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
Sediment is building up on Remove the sediment and
the filter strip. restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application.
Plants are desiccated. Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizes lication.
Nuisance vegetation is Remove vegetation by hand if
choking out desirable species. possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality local Regional Office, or the
outlet. 401 Oversight Unit at 919-733-1786.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 2 of 4
Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name: NE Judd Parkway Extension
BMP drainage area numberTermit impact Site # 6 (Preformed Scour Hole at 87+65 -L-
RT
Print name:Town of Fuquav-Varina
Title:Town Manager - Andy Hedrick
Address:401 Old Honeycutt Road, Fuquav-Varina, NC 27526
Phone: [phone]
Signature:
Date: -,// y
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.
J
a Notary Public for the State of
of do hereby certify that
personally appeared before me thi5A(A_?7
- 09 , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
4
A?N
F
NOTA /? Y
tt °I jBLAG
Co U
SEAL
My commission expir 3 , a
J
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 4
Permit Number:
(to be provided by DWQ)
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 4 of 4