20071986 Ver 3_More Info Received_20080924

-?=- M U LK EY
ENGINEERS & CONSULTANTS
Po Box 331 27
RALEIGH, NO 27636
PHONE: 919-B51-1912
FAx: [phone]B
Date: September 23, 2008
LETTER OF TRANSMITTAL
To: Division of Water Quality
401/Wetlands Unit
2321 Crabtree Blvd, Suite 250
Raleigh, NC 27604
ATRA: ANNfiTrF,
Re: Richland Ridge Road Extension
I am sending you the following item(s):
y„`?l TI" ?l r'^q ? ?5 I? 7 e

SF.f' ZC?B
1104R 1dr,+?k2QLl,Ll1?
f-Ts pJ0S AQ .> `0RM!, 3t?PS,G i
o9-Igslo v3
** HAND DELIVER **
Job No.: 2006280.00
COPIES DATE NO. DESCRIPTION
1 Response to comment letter

1 Calculations package(w/ checklist, pictures,

worksheets)
1 Revised Construction Plans

These are transmitted as checked below:
? As requested ? For your use
? For approval ? For Signatures
® For review and comment ?
Remarks:
Per your Request for more information dated September 17, 2008, please find the revised plans and
supporting documentation package. Please let me know if there are any questions or comments. (919)
858-1811 or [e-mail]. Thank you for your time and assistance.
Copy to: Signed:
Project Engineer
MULKEY
?.,,-...._._.,._. C1 11su_'-., ._
September 23, 2008
Annette Lucas
401 Oversight/Express Review Permitting Unit
2321 Crabtree Boulevard, Suite 250
Raleigh, North Carolina 27604
Re: Richland Ridge Road Extension
Ut to Richland Creek [030402, 27-43-15-(1), C, NSW]
Ms.Lucas,
Please find attached the information you requested in your letter dated September 17, 2008 and
received September 18, 2008. We would like to respond to your questions with the following
information:
1. Level Spreader #2 location has been moved to a slope that is 3.7% as to not exceed the
allowable 8%. We have provided the revised plans and calculations to further explain the
location and support the revised location. We have provided the checklist, level spreader
worksheets, bypass box calculations, drainage area maps, photographs, and sign O&M for
each level spreader
Please let me know if you have any questions or comments. Thank you for your time and
consideration.
Sincerely,
Warren M. Sugg, P.E.
Project Engineer
MULKEY INC. 6750 TRYON ROAD CARY, NO 27511 PO Box 33127 RALEIGH, NO 27636 PH: 919-851-1912 FAX: [phone] WWW.MULKEYINO.COM
?0F w A rFRQ Michael F. Easley, Governor
?0 G William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
(p -C Coleen H. Sullins, Director
Division of Water Quality
September 17, 2008
DWQ Project # 07-1986, Ver. 3
Wake County
CERTIFIED MAIL: RETURN RECEIPT REQUESTED
La Scala Associates, LLC 4
123 S. White Street
Wake Forest, NC 27587
Subject Property: Richland Ridge Road Extension
Ut to Middle Creek [030403, 27-43-15-(1), C, NSW]
REQUEST FOR MORE INFORMATION - REVISED
Dear Sir or Madam:
On March 26, 2008, the Division of Water Quality (DWQ) received your application dated
March 24, 2008, to fill or otherwise impact 146 linear feet of perennial stream, and 8,465 square
feet of Zone 1 Neuse River basin protected riparian buffers and 4,484 square feet of Zone 2
Neuse River basin protected riparian buffers to construct a residential development at the site.
On July 31, 2008, and August 1, 2008, the DWQ received additional information from you,
however, the DWQ has determined that your application remains incomplete and/or provided
inaccurate information as discussed below. The DWQ will require additional information in
order to process your application to impact protected wetlands and/or streams on the subject
property. Therefore, unless we receive five copies of the additional information requested
below, we will place this project on hold as incomplete until we receive this additional
information. If we do not receive the requested information, your project will be formally
returned as incomplete. Please provide the following information so that we may continue to
review your project. This Request For More Information replaces the Request For More
Information dated September 2, 2008.
Additional Information Requested:
1. The slope in the filter strip of the proposed level spreader number 2 exceeds the
allowable eight percent. Please either relocate this level spreaders to a location where the
filter strip slope is appropriate for a level spreader or provide a BM that removes a
minimum of 85 percent TSS and 30 percent TN from the stormwater generated by
drainage area 2. For the proposed BMP, please provide a completed BMP Supplement
Form, with all the required items. The BMP Supplement Forms are available at:
http://h2o.enr.state.nc.us/suibmp forms.htm. Please include both the Design Summary
and the Required Items Checklist
along with all the required items listed therein.
401 Oversight[Express Review Permitting Unit
1650 Mail Service Center, Raleigh, North Carolina 27699-1650
2321 Crabtree Boulevard, Suite 250, Raleigh, North Carolina 27604
Phone: [phone] / FAX [phone] / Internet: http:/A12o.enr.state.ne.us/ncwetlands
One
Nv
?i hCarolina
Naturally
An Equal Opportunity/Affirmative Action Employer - 50% Recycled/] 0% Post Consumer Paper
La Scala Associates
Page 2 of 2
September 17, 2008
Please submit this information within 30 calendar days of the date of this letter. If we do not
receive this requested information within 30 calendar days of the date of this letter, your project
will be withdrawn and you will need to reapply with a new application and a new fee.
This letter only addresses the application review and does not authorize any impacts to wetlands,
waters or protected buffers. Please be aware that any impacts requested within your application
are not authorized (at this time) by the DWQ. Please call Ms. Cyndi Karoly or Mr. Ian
McMillan at 919-733-1786 if you have any questions regarding or would like to set up a meeting
to discuss this matter.
Since ely,
Cyndi X
aroly, Supervisor
401 Oversight/Express Review Permitting Unit
CBK/Ym
cc: Lauren Witherspoon, DWQ Raleigh Regional Office
USACE Raleigh Regulatory Field Office
File Copy
Central Files
Bob Zarzecki, S&EC, P.A., 11010 Raven Ridge Road, Raleigh, NC 27614
Filename: 071986 Ver3RichlandRidgeRoadExt(W a ke)On_Hoid2_Revised
MULKEY
September 23, 2008
09 - 1?9 c, 0.3
The Registry at Bennett Park
Checklist
Calculations
Operation and Maintenance Agreement
Pictures

1 $
Engineer's Statement: Mulkey Engineers will monitor the Contractor's installation of the level
spreaders to ensure that they are installed in accordance with the design calculations and construction
drawings and that the entire drainage area is stabilized. If the level spreaders are installed correctly,
then based on the design requirements and guidance produced by DWQ, they should operate as
design.
MULKEY INC. 6750 TRYON ROAD CARY, NO 27511 PO BOX 33127 RALEIGH, NO 27636 PH: 919-B51•1912 FAX: [phone] WWW.MULKEYINC.COM

' III. REQUIRED ITEMS CHECKLIST
' Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
' requirement has not been met, attach justification.
Pagel Plan
Initials Sheet No.
W&A 5 L_0331 1. Plans (1" - 50' or larger) of the entire site showing:
Design at ultimate build-out,
- Off-site drainage (if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Forebay (if applicable),
High flow bypass system,
Maintenance access,
Proposed drainage easement and public right of way (ROW), and
Boundaries of drainage easement.
J? G 2. Plan details (1" = 30' or larger) for the level spreader showing:
' G" 3b Forebay (if applicable),
High flow bypass system,
One foot topo lines between the level lip and top of stream bank,
Proposed drainage easement, and
' Design at ultimate build-out.
_ G-?a 3. Section view of the level spreader (1" = 20' or larger) showing:
G-3b - Underdrain system (if applicable),
- Level lip,
- Upslope channel, and
' - Downslope filter fabric.
WM S G (A 4. A date-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.

\J5 5. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
?UNA S 6. The supporting calculations.
1..Irh S re>,rrAt,6 7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
1,JS GALG .
8. A copy of the deed restrictions (if required).
I Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Part III, page 1 of 1
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.1 11 = 901
Method for Sizing Trapezoidal Channels
Project Name: Bennett
' Operator: wms
Job Number: 2006280.00
Date: 1/22/2008
Channel: Bypass Channel for Level Spreader #1
' Description: 10-yr Design
Design Parameters =_> Cited tables and figures are from "NC Erosion & Sediment Control Planning and Design Manual"
Peak Flow, Q = 21.13 CFS
Channel Lining = Rip Rap
Max. Permissible Velocity, Vmax = 4.0 FPS (Table 8.05a)
' VR = 2.18 for use in Figure 8.05c
Manning's Roughness Coefficient, n = 0.02 from Figure 8.05c, using Retardance Classification "C"
Longitudinal Slope of Channel, s = 0.040 FT/FT
Bottom Width, B = 4 FT
' Horizontal Side Slopes, M = 3 FT
design channel depth, d = 1.5 FT
normal water depth, dn = 0.9 FT
' Channel Physical Calculations =_>
Cross-Sectional Area, A = 6.03 SF
Wetted Perimeter, P = 9.69 FT
' Hydraulic Radius, R = 0.62 FT
Find Normal Depth =_>
' Zreq = 1.418
Zav = 4.395 OK<
Change values of B, M, and d until Zreq - Zav
Calculate Velocity =_>
Calculated Velocity, V = 3.50 FPS
' Check to make sure V is less than Vmax OK
Check Freeboard =_> Need at least 6" of freeboard
' Freeboard, df = 7.20 in
OK

n

1

NCDENR
O?O? waT F9?G
v? r
O r
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part 111) must be printed, filled out and submitted along with all of the required information.
11. PROJECT INFORMATION
Project name The Registry at Bennett Park
Contact name Warren M. Sugg, PE
Phone number 919-858-1811
Date July 14, 2008
Drainage area number Drainage #1
II. DESIGN INFORMATION
For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawdown flow from the BMP cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area
Impervious surface area
Percent impervious
Rational C coefficient
Peak flow from the 1 in/hr storm
Time of concentration
Rainfall intensity, 10-yr storm
Peak flow from the 10-yr storm
Where Does the Level Spreader Discharge?
To a bioretention cell?
To a wetland?
To a filter strip or riparian buffer?
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass
Width of dense ground cover
Width of wooded vegetation
Total width
Slope (from level lip to to top of bank)
Are any draws present?
282,054 ft2
34,540 ft2
n 4n
0.43
2.784279614 cfs
min
7.22 in/hr
20.10249882 cfs
(Y or N)
(Y or N)
Y (Y or N) Please complete filter strip characterization below.
ft
200 ft
ft
200 ft
4 %
N (Y or N) OK
Level Spreader Design
Forebay surface area 66 sq ft OK
' Feet of level lip needed per cfs 13 ft/cfs
Answer "Y" to one of the following:
Length based on the 1 in/hr storm? Y (Y or N)
' Length based on the 10-yr, 24-hr storm? (Y or N)
Length based on the BMP discharge rate? (Y or N)
Design flow 3.4 cfs
Is a bypass device provided? Y (Y or N) OK
' Length of the level lip 45 ft Level spreader length OK.
Are level spreaders in series? N (Y or N)

Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.3 Parts I. and II. Design Summary, page 1 of 2
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
y
Peak velocity in the channel during the 10-yr, 24-hr storm
Channel lining material
N (Y or N)
3 ft
4 ft
12 ft
1.3 ft
4 cfs
Rip Rap
I
I
M
1
I
I
M
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.3 Parts I. and Il. Design Summary, page 2 of 2
-=-MULKEY
ENGINEERS & CONSULTANTS
CLIENT SUBJECT
PROJECT No.
Calculation Sheet
Flow from first inch to Level Spreader (Q,,.) = 3.40 cfs
Total Flow from System (Q10) = 24.53 cfs
Flow to Bypass system (Q) = 21.13 cfs
HEADWATER DESIGN
Q1• =.0437 * 0.6 " d2 * sgrt(z-(d/24))
d = PVC outlet pipe diameter (try) 8
z = height of weir
WEIR DESIGN
Z= 1.54' OK
USE = 1.00'
Assumption for height of water over weir = 1.0'
Q=CW*B*H1.5
CW = 3.33 for sharp-crested weirs
B = width of weir (solve for)
H = Height assumption
B = 6.35'
Say 3'-3" for width
Use Standard 24" x 44" precast box
Minimum height of box (without lid)= 2.00
Page OF
Prepared By Date
Reveiewed By Date
Values to be input by user
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Method for Sizing Trapezoidal Channels
Project Name: Bennett
Operator: wms
Job Number: 2006280.00
Date: 1/22/2008
Channel: Bypass Channel for Level Spreader #2
Description: 10-yr Design
Design Parameters =_> Cited tables and figures are from "NC Erosion & Sediment Control Planning and Design Manual"
Peak Flow, Q = 7.53 CFS
Channel Lining = Ri p Rap
Max. Permissible Velocity, Vmax = 4.0 FPS (Table 8.05a)
VR = 1.42 for use in Figure 8.05c
Manning's Roughness Coefficient, n = 0.02 from Figure 8.05c, using Retardance Classification "C"
Longitudinal Slope of Channel, s = 0.040 FT/FT
Bottom Width, B = 1.5 FT
Horizontal Side Slopes, M = 3 FT
design channel depth, d = 1.1 FT
normal water depth, dn = 0.6 FT
Channel Physical Calculations ==>
Cross-Sectional Area, A = 1.98 SF
Wetted Perimeter, P = 5.29 FT
Hydraulic Radius, R = 0.37 FT
Find Normal Depth ==>
Zreq = 0.505
Zav = 1.028 OK
Change values of B, M, and d until Zreq <= Zav
Calculate Velocity ==>
Calculated Velocity, V = 3.80 FPS
Check to make sure V is less than Vmax OK
Check Freeboard =_> Need at least 6" of freeboard
Freeboard, df = 6.00 in
OK
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NCDENR
`
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
' 401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be filled out, printed and submitted.
' The Required Items Checklist (Part 111) must be printed, filled out and submitted along with all of the required information.
I
PROJECT INFORM
TIO
.
N
A

Project name _
The Registry at Bennett Park
Contact name Warren M. Sugg, PE
Phone number 919-858-1811
Date September 23, 2008
' Drainage area number Drainage #2
II. DESIGN INFORMATION
For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawdown flow from the BMP cfs
For Level Spreaders Receiving Flow from the Drainage Area
' Drainage area 115,057 ft
Impervious surface area 23,209 ftz
Percent impervious 0.20
Rational C coefficient 0.46
' Peak flow from the 1 in/hr storm 1.215018825 cfs
Time of concentration min
Rainfall intensity, 10-yr storm 7.22 in/hr
' Peak flow from the 10-yr storm 8.772435914 cfs
Where Does the Level Spreader Discharge ?
To a bioretention cell? (Y or N)
To a wetland? (Y or N)
To a filter strip or riparian buffer? Y (Y or N) Please complete filter strip characterization below.
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass ft
Width of dense ground cover ft
' Width of wooded vegetation 80 ft
Total width 80 ft
Slope (from level lip to to top of bank) 3.79 %
' Are any draws present? N (Y or N) OK
Level Spreader Design
Forebay surface area 45 sq ft OK
' Feet of level lip needed per cfs 65 ft/cfs
Answer "Y" to one of the following:
Length based on the 1 in/hr storm? Y (Y or N)
Length based on the 10-yr, 24-hr storm? (Y or N)
Length based on the BMP discharge rate? (Y or N)
Design flow 1.2 cfs
Is a bypass device provided? Y (Y or N) OK
Length of the level lip 79 ft Level spreader length OK.
Are level spreaders in series? N (Y or N)
I Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.3 Parts I. and II. Design Summary, page 1 of 2
!MULKEI?"
I!L T_
CLIENT SUBJECT
PROJECT No.
Flow from first inch to Level Spreader (Q1..) = 1.21 cfs
Total Flow from System (Q10) = 8.74 cfs
Flow to Bypass system (Q) = 7.53 cfs
HEADWATER DESIGN
Qv =.0437 * 0.6 * d2 * sqrt(z-(d/24))
d = PVC outlet pipe diameter (try) 6"
z = height of weir
WEIR DESIGN
Calculation Sheet
z= 1.61' OK
USE = 1.00'
Assumption for height of water over weir = 1.0'
Q=CW*B*H1.5
CW = 3.33 for sharp-crested weirs
B = width of weir (solve for)
H = Height assumption
B = 2.26'
Say 1'-6" for width
Use Standard 24" x 44" precast box
Minimum height of box (without lid)= 2.00
Page OF
Prepared By Date
Reveiewed By Date_
Values to be input by user

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08/01/2008 07:50 9195626816 CADY CONSTRUCTION PAGE 02/07
Pcnnit Number:
(to be providrzd 1?y,gjFQ)
Drainage Area Nutnber:,!?
J'yiiter Strip, Restored Riparian Buffer and Level Spreader
Operation and Maintenance Agreernen.t
I will ka:ep a maintenance record. on. this 13MP, This maintenance record will be kept in a
log in a known set location. Any deficient 8MP el.emcnts noted in the inspection will be
correcuE d, repaired or replaced, immediately. These deficiencies can affect the integrity
of structures, safety cif the public, and the: removal efficiency of the BMP.
Import;,jit 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
`tegetation
- :3table 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 wvial be mowed and the clippings
'iarvested to promote the growth of thick vegetation. with optiimum pollutant
emoval efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
;nay be allowed to grow as tall as 12 inches depending on aesthetic requirements
iNIPC,1993). Forested filter strips do not require this type of maintenance.
- Once a year, the soil will be aerated if necessary.
06.tce a year, soil pH will be tested and lime will be added if necessary.
After thle filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 irteh (or 1.5 inches if in a Coastal County).
Record; of operation and maintenance will be kept in. a known set location and will be
availablk upon request.
Inspectibn activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How l will remediate the problem:
The etEire filter strip Trash/debris is present. Remove the trash./debris,
stem
The flow splitter device The flow splitter device is Unclog the conveyance and dispose
(if applicable) clogged. o any sediment off-site. _
The flow splitter device is Make any necessary repairs Or
damaged. replace if damage is too large for
repair,
Form 5wU40I-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev3 Page l of 3

08101/2008 07:50 9195626816 CADY CONSTRUCTION PAGE 03/07
BMl' element. Potential problem: Ilow I will remediate tie roblem:
The swtde and the level The Swale is clogged wi.tb 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 stormwafer has then plant a ground. cover and
bypassed it, water until it is established. Provide
lime and a one-time fertilizer
application.
Frees ar sltrubs have begun Remove them.
to grow on the Swale or just
downslo a of the level lip.
The byppass channel Arcas of bare soil and/or Regrade the sail if necessary to
erosive gullie_n have forni.ed. remove the gully, and then
reestablish proper erosion control.
Turf reir?forcement is Study the site to see if a larger
damaged or ri.pap is rolling bypass channel is needed (enlarge if
downhill. necessary). After this, reestablish
the erosion control. material.
The fill-er strip Grass is too short or too long Maintain. grass at a height of
if applicable). a. roximatel 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 un'lil it is
established. Provide lime and a
one-time fertilizer a I.ication.
Sediment is building up on Remove the sediment and
the filter strip. resfabilize 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 l7etermine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
Fertilizer application.
Nuisance vegeta Mon is Remove vegetation by hand if
choking out desirable species. possible. Tf 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 9:19-733-1.786.
Form S1iVU401-,Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rcv.3 Page 2 of 3
0810112008 07:50 9195626816 CADY CONSTRUCTION PAGE 04/07
' Permit Number:
(to tae pr-oWded by I TF0
I acknowledge and agree by my signature below that I ain responsible for the
perf'amiartce of the maintenance procedures listed. above. I agree to notify DWQ of any
problerois with the system. or prior to any changes to the system or responsible party.
Pr•oject!name:,,,_,:)ja ? lsilz,' A.. &E.1,-4L--err 1&zy,
BMP diainag°e area wintber: .01
Print nahne.'sVm- /? FV. /101
I, ' Q -hY?l 1? 1 ?Ck - - , a Notary Public for the State of
Ap?zk ?n!?t01_._ -,County of O!a
jo, , do hereby certify that
personally appeared before me this 1
day of_n? , and acknowledge the due execution of the
forgoin $ filter strip, riparian buffer, and/or level spreader maatenance requirements.
Witness nay band and official seal,
plAP
i ?
SEAL
My eontunission expires ??-(?rp------ -
Form $%. U401-Level Spreader, Filter Strip, Reslored Riparian, Buffer O&M-Rev.3 Page 3 of 3
Note: `,,he legally responsible party should not be a homeowners association unless more than 50% of
he Ions have been sold and a resident of the subdivision has been named the president.
' 08101/2008 07:50 9195626816 CADY CONSTRUCTION PAGE 05/07
1 laermit Number: _ __
(co beprovided by DIVQ)
Drainage Area Number. -A -Z
Filter Strip, Restored Riparian Suffer and Level Spreader
Operation and Maintenance Agreement
I will keep a maintenance record on this WE This mai ntenance record will be kept in a
' log in a known set location. Any deficient BMW elements noted in the inspection will be
correct6d, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the publir, and the removal efficiency of the BMP.
Importiint maintenance procedures:
';Immediately after die 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 tl-ke
°jediment 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 willlie aerated if necessary,
Gnce a year, soil pH will be tested and lime will be added if necessary.
After tt,.e filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.4 inch (or 1.5 inches if in a Coastal County).
Records of operation axed maintenance will be kept in a known set location and will be
availab?,e upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repahred immediately.
BMP element: Poteniial roblenn: How I will remediate the problem:
The entire filter strip Trash/debris is present. Remove the trash/debris.
s stere.
The flow splitter device The flow splitter device is Unclog the conveyance and dispose
(if applicable) clogged. of an sediment off-site.
Tle low splitter device is Make any necessary repairs or
damaged. replace if damage is too large for
rC air.
Forn1 SV rG401-Level Spreader, Filter Strip, Retitored Riparian Buffer O&M-Rev_3 Pagc I of 3
0810112008 07:50 9195626816 CADY CONSTRUCTION PAGE 06107
BMP element- Potential problem: How 1, will remediate the blem:
The swAle and the level The swa.le is clogged with Remove the sediment and dispose
Ii.p 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 lrrvel sproader that that is higher than the level lip, and
shows storrnwater has then plant a ground cover and
bypassed it, water until it is established. Provide
lime and a one-time ferti.lft.cr
application,
Trees or shrubs have begun Remove them,
too grow on the swale or just
downslo of the level lip-
The bypass channel Areas of bare soil and./or Regrade Vie 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 filwer strip Grass is too short or too long Maintain grass at a height of
if a lkable . approximately three to six inches.
Areas of bare soil. and/or RegTade 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 a lication,
Sediment is building up on Remove the sediment and
the filter strip. restabil.iZC 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 pmblern 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 Dversi ht Unit at 919-7,13-1,786.
Form SWI.V401 -Level Spreader, Filter Strip. Restored Riparian Buffer O&M-Rcv.3 Page 2 of 3
08/01/2008 07:50 9195626816 CADY CONSTRUCTION PAGE 07107
' Permit Number.
(to be provided lit;
I acknowledge and agree by my signature below that I am responsible for the
perfornxance of the maintenance procedures listed above. I agree to notify DWQ of any
problerrl.s 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
:he lots have been sold and a resident of the subdivision has been named the president.
l'-0.
, ___0.4AW e ,, ?. , a Notary Public for the State of
t4o ti Q YO\inCt County of „-, do hereby certify that
personally appeared before me this
day of , 2-005and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witnesx ip-lamed official seal,
}
i I,i ? •7t ?' 1 `
STEAL
M cor`imission exrTres I - -
..?
1
Form SVIU401-Level Spreader, Filter Strip, Restored Riparian. buffer Q&M?Rev.3
Page 3 of 3
Project; atne., -Mf Rg&tiS-t g e rsr pasz,>4
BMP di-ainage area. nunaber: -* -Z