20061955 Ver 3_More Info Received_20081028

Dennis Ray Blackmon, R.L.S.
1023C W. Market Street
PO Box 1401
Smithfield, NC 27577
October 27, 2008
Annette Lucas, PE
401 Oversight/Express Review Permitting Unit
2321 Crabtree Blvd.
Suite 250
Raleigh, N.C. 27604-2260
Subject: Greystone Crossing Phase 3
Revised Plan
Pre-Construction Notification Application
Pleasant Grove Township, Johnston County
Dear Mrs. Lucas,
Telephone [phone]
Fax [phone]
D
0 C T 2 2008
WEFIANDS AND STORMWATEIR BRANCH
Please find five copies of the revised plan as per your letter dated October 2, 2008 and
our phone conversation on October 15, 2008. The revisions are as follows:
1. Please find attached the Items Check List for each of the proposed level spreaders.
2. The details for the scour hole is on plan sheet 8
3. Scour hole has been oriented to the contour lines
4. A current version of the O&M agreement has been included for each level
spreader and scour hole.
5. I have added a level spreader to the low on lot 57 as required. Concerning the
stormwater to the existing ditch between lots 162 and 163, I emailed you a copy
of 15A NCAC 02B .0238 (8) (d) (ii), which I read to say that stormwater may be
released to an existing ditch. I have not heard back from you and my dead line
was fast approaching for submittal.
6. There is a riprap energy dissipater at the end of this ditch and I have included
calculations showing the flow is less than 2ft/s as required.
If you have any questions or need any additional information, please give me a call at
919-934-3490.
Sincere y,
ndrew W. Hodge, P.E.
1 of 1

(c)

management and water management plans meet the standards
and specifications of the USDA - Natural Resources
Conservation Service or the standards and specifications
adopted by the NC Soil and Water Conservation Commission.
If the nutrient management plans and water management plans
are not implemented, then a riparian area pursuant to this
Section is required.
The following arc modifications to the riparian area requirements.
0) On agricultural land where either water control structures with
a water control structure management plan, or a nutrient
management plan is implemented according to the standards
and specifications of the USDA - Natural Resources
Conservation Service or the standards and specifications
adopted by the NC Soil and Water Conservation Commission,
then a 2041 forested or a 30-ft vegetated butTcr is required.
The water control structures or nutrient management practices
must provide equivalent protection and directly affect the land
and waterbodies draining into the waterbody with a modified
buffer requirement. To the maximum extent practical, water
control structures shall be managed to maximize nitrogen
removal throughout the year. A technical specialist designated
pursuant to rules adopted by the Soil and Water Conservation
Commission must provide written approval that the nutrient
management plan meets the standards and specifications of the
USDA - Natural Resources Conservation Service or the
standards and specifications adopted by the NC Soil and Water
Conservation Commission.
(ii) A vegetated riparian area may be substituted for an equivalent
width of forested riparian area within 100 feet of the drainage.
(iii) Where the riparian area requirements would result in an
unavoidable loss of tobacco allotments [(7 CFR 723.220(c)J
and the BMPs of controlled drainage or nutrient management
arc not in place, forest. cover is required only in the first 20
feet of the riparian area.
(d) Maintenance of Zones I and 2 is required in accordance with this Rule.
(i) Sheet flow must be maintained to the maximum extent
practical through dispersing concentrated flow and re-
establishment of vegetation to maintain the effectiveness of the
.-.riparian area. _ _ _?--
(ii) Concentrated runo- fft rom new ditches or manmade ?.
conveyances must be dispersed into sheetflow before the
runoff enters Zone 2 of the riparian area. xisting ditches anc,
/ unmade conveyances, as specified to Sub-Item (8)(b) ii of
this Rule, are exempt from this requiremen owever, care
shall be taken to minimize O- ul<ri Ming through these
existing ditches and manmade conveyances from fertilizer
application or erosion.
(iii) Peno ec c& ctive action to restore sheet flow shall be taken
by the landowner if necessary to impede the formation of
erosion gullies which allow concentrated flow to bypass
treatment in the riparian area.
(e) Periodic maintenance of modified natural streams such as canals is allowed
provided that disturbance is minimized and the structure and function of the
riparian area is not compromised. A grassed travelway is allowed on one side of
the waterbody when alternative forms of maintenance access are not practical.
The width and specifications of the travelway shall be only that needed for
equipment access and operation. The travelway shall be located to maximize
stream shading.
(f) Whcre the standards and management requirements for riparian areas are in
conflict with other laws, regulations, and permits regarding streams, steep slopes,
erodible soils, wetlands, floodplains, forest harvesting, surface mining, land
disturbance activities, development in Coastal Area Management Act Areas of
Environmental Concern, or other environmental protection areas, the more
protective shall apply.
10YR STORM FROM DITCH 53-DISSIPATOR PAD
Worksheet for Trapezoidal Channel 4 ,, r, eAr^ (dl
Project Description
Project File c:\program files\haestad\fmw\greystn3.fm2
Worksheet OUTFALL DITCHES
Flow Element Trapezoidal Channel
Method Manning's Formula
Solve For Channel Depth

Input Data
Mannings Coefficient 0.032
Channel Slope 3.9000 %
Left Side Slope
Ri
ht Sid
Sl
e 4.000000 H : V
4
000000 H : V
g
e
op .
Bottom Width 9.00 ft
Discharge 1.62 cfs
Results
Depth 0.09 ft
Flow Area 0.88 ftz
Wetted Perimeter 9.77 ft
Top Width 9.75 ft
Critical Depth 0.10 ft
Critical Slope 0.0328 32 ft/ft
?
a 3 ?? •?
Velocity 1.84 c
ft/s
Velocity Head 0.05 ft
Specific Energy 0.15 ft
Froude Number 1.08
Flow is supercritical.

2
6k
W z ,. r Ir 3
10/06/08 FlowMaster v5.17
05:04:21 PM Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 [phone] Page 1 of 1
• 0 OG
• D ~' ?-? C' vWATF9
y r
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely filled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)!
I. PROJECT INFORMATION
Project name GREYSTONE CROSSING PHASE 3
Contact name ANDREW HODGE
Phone number 934-3490
Date May 19, 2008
Drainage area number 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 78,844.00 ftz
Impervious surface area 11,827.00 ftz
Percent impervious 15.00 %
Rational C coefficient 0.31
Peak flow from the 1 in/hr storm 0.56 Cfs
Time of concentration 10.00 min
Rainfall intensity, 10-yr storm 6,21 in/hr
Peak flow from the 10-yr storm 3.48 cfs
Where Does the Level Spreader Discharge ?
To a grassed bioretention cell? N (Y or N)
To a mulched bioretention cell? N (Y or N)
To a wetland? Y (Y or N) Please complete filter strip characterization below.
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 35.00 ft
Width of wooded vegetation 15.00 ft
Total width 50.00 ft
Elevation at downslope base of level lip 253.83 fmsl
Elevation at top of bank of the receiving water 250.85 fmsl
Slope (from level lip to to top of bank) 5.96 % OK
Are any draws present? N (Y or N) OK
Level Spreader Design
Forebay surface area 23.80 sq ft OK
Feet of level lip needed per cfs 29 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 storm? N (Y or N)
Length based on the BMP discharge rate? N (Y or N)
Design flow 0.56 cfs
Is a bypass device provided? Y (Y or N) OK
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Parts I. and Il. Design Summary, page 1 of 2
Length of $te level lip
Are level spreaders in series?
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 storm
Channel lining material
17.00 It Level spreader length OK.
N (Y or N)
Y (Y or N) Redesign channel to discharge to a dissipator pad adjacent to the wetland.
Y (Y or N)
3.00 It
3.00 it
4.73 ft
0.29 ft
3.48 cfs
RIPRAP
W
------------
M
: B :
M
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Parts I. and II. Design Summary, page 2 of 2
L e1/c J?'ec.Y ICJ?y
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
In ial Sheet No.
Uf 3 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), i
- Forebay (if applicable),
- High flow bypass system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROW), and
- Boundaries of drainage easement.
"
'
2. Plan details (1
= 30
or larger) for the level spreader showing:
- Forebay (if applicable),
- High flow bypass system,
- One foot topo lines between the level lip and top of stream bank,
- Proposed drainage easement, and
Q - Design at ultimate build-out.
i
3
ti
f th
l
l
1" = 20'
l
h
i
S
d
.
ec
on v
ew o
e
eve
sprea
er (
or
arger) s
ow
ng:
- Underdrain system (if applicable),
- Level lip,
- Upslope channel, and
- Downslope filter fabric.
4. A date-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
WeJ F( 3
5. A construction sequence that shows how the level spreader will be protected from sediment until the entire
9 erne --J./ drainage area is stabilized.
6. The supporting calculations.

7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
8. A copy of the deed restrictions (if required).
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Part III, page 1 of t
Permit Number:
(to be provided by DWQ)
Drainage Area Number: L S
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 ansediment 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 3
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
a lication.
Trees or shrubs have begun Remove them.
to grow on the swale or just
downslo 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 3
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:GREYSTONE CROSSING PHASE 3
BMP drainage area number: L C ? cI . 5 t
Print name:MIKE COATES
Title:OWNER
Address: 12400 NC 50 NORTH WILLOW SPRINGS NC 27592
Phone:
Signati
Date:--- A-5 /Z 7?cS
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.

IX&h011 , a Notary Public for the State of
CUryll&q , County of n S)Dn , do hereby certify that
_?Lt`L?'IQGr! ?- ?pet1?P? personally appeared before me this d 9-A/
day of bar a p0?, and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
•?? ?SPP... BBC ???
••,?..
?~ /, ..'
NOTARY ..OZ
~ r
r ? r
r L. ?
i / ? ?
.0% PUBuc
"

SEAL •. :zn?m
My commission expires ? C O! v
Form SWU40I-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 3
" • ?' ?j J ' J U O?O? W AT e9?G
ATA
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely filled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)I
I. PROJECT INFORMATION
Project name GREYSTONE CROSSING PHASE 3
Contact name ANDREW HODGE
Phone number 934-3490
Date October 16, 2008
Drainage area number 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
Impervious surface area
Percent impervious
Rational C coefficient
Peak flow from the 1 in/hr storm
Time of concentration
Rainfall intensity, 1 0-yr storm
Peak flow from the 10-yr storm
Where Does the Level Spreader Discharge ?
To a grassed bioretention cell?
To a mulched 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
Elevation at downslope base of level lip
Elevation at top of bank of the receiving water
Slope (from level lip to to top of bank)
Are any draws present?
Level Spreader Design
Forebay surface area
Feet of level lip needed per cfs
Answer "Y" to one of the following:
Length based on the 1 in/hr storm?
Length based on the 10-yr storm?
Length based on the BMP discharge rate?
Design flow
Is a bypass device provided?
157,034.00 ftz
23,555.00 ft2
15.00 %
0.31
1.12 cis
10.00 min
6.21 in/hr
6.94 cfs
N (Y or N)
N (Y or N)
N (Y or N)
Y (Y or N)
It
ft
Please complete filter strip characterization below.
68.00 ft
68.00 ft
238.65 fmsl
237.69 fmsl
1.41 % OK
N (Y or N) OK
47.00 sq It OK
65 ft/cfs
Y (Y or N)
N (Y or N)
N (Y or N)
1.12 GIs
Y (Y or N) OK
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Parts I. and ll. Design Summary, page 1 of 2
Length of the level lip
Are level spreaders in series?
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 storm
Channel lining material
73.00 ft Level spreader length OK.
N (Y or N)
N (Y or N)
Y (Y or N)
3.00 It
3.00 ft
7.07 ft
0.68 ft
13.88 cfs
RIPRAP
W •
------------
M

M
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Parts I. and IL Design Summary, page 2 of 2

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
In' ' Shoot No.
W4.-? lir"

?n3

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.
2. Plan details (1" = 30' or larger) for the level spreader showing:
- Forebay (if applicable),
- High flow bypass system,
- One foot topo lines between the level lip and top of stream bank,
- Proposed drainage easement, and
- Design at ultimate build-out.
3. Section view of the level spreader (1" = 20' or larger) showing:
- Underdrain system (if applicable),
- Level lip,
- Upslope channel, and
- Downslope filter fabric.

4. A date-stamped photograph of the filter strip that dearly shows the type of vegetation that is present.
5. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
6. The supporting calculations.
7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
8. A copy of the deed restrictions (if required).
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Part III, page 1 of 1
Man
:.'
CA off van
w
-
' z
?P
h 5
Sol;
?ttY,
1 x
too,
^--az a
}
too
gists
IF LIND!
Ito
' r 4 ?. ..
WIN
s .,
too-
0 T,
t
0 ire
x
_x a 2 • '? <. ?'z' ,?,_ -' d? ..wed '4= a
,
orA
m
it

Cd?a 7
ze, VL?
3/
G
Ti'Y?C?(?LQ st .s /I i`C i r ^( L G
CS 67 z
35502 l
_`?'. /L rV I l d ? eo????
c c
c ? c / ???,.?,s,,,l ?? ?s ? (/ ?? ?- Z Zy? is /. / Z
c

- t

! 1 i
s =7 G, 3 `r3 s i =tom
GAvC
?7 = z
z*
S

P?? = Cs. 3 93 sr
P/ Z
/ z
y 2.2y? ??.393
s.
35502
71?
G /at...•t?c..,r c? C Cd.c.?! .
_kt /- Z?ZQct
= 2 ! 9 45-
7 WIT

min.
35502
LEVEL SPREADER BYPASS CHANNEL -2&3
Worksheet for Trapezoidal Channel

Project Description L
Project File c:\program flles\haestad\fmw\greystn3.fm2
Worksheet LEVEL SPREADER BYPASS CHANNEL
Flow Element Trapezoidal Channel
Method Manning's Formula
Solve For Channel Depth
Input Data
Mannings Coefficient 0.032
Channel Slope 2.1000 %
Left Side Slope 3.000000 H : V
Right Side Slope 3.000000 H : V
Bottom Width 3.00 ft
Discharge 13.88 cfs
Results
Depth 0.68 ft
Flow Area 3.42 ft=
Wetted Perimeter 7.29 ft
Top Width 7.07 ft
Critical Depth 0.69 ft
Critical Slope 0.019725 ft/ft
Velocity 4.06 ft/s
Velocity Head 0.26 ft
Specific Energy 0.93 ft
Froude Number 1.03
Flow is supercritical.
10/24/08 FlowMaster v5.17
11:42:03 AM Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 08708 [phone] Page 1 of 1
Permit Number:
(to be provided by DWQ)
Drainage Area Number. L s ' Z
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:
The entire filter strip
Potential problem:
Trash/debris is present.
How I will remediate the
Remove the trashme-bris.
The flow splitter device
(if applicable)
The flow splitter device is
The flow splitter device is
damaged.
Unclog the conveyance and dispose
of any sediment off-site.
Make any necessary repairs or
replace if damage is too large for
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 1 of 3
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 wafter 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 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). 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 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
wager.
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
outi?+ 401 Oversi t Unit at 919-733-1786.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 2 of 3
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:GREYSTONE CROSSING PHASE 3
BMP drainage area number:- Z -c v 'd 5 ?r A .'e- Vi66 Z
Print name:MIKE COATES
Title:OWNER
Address: 12400 NC 50 NORTH WILLOW SPRINGS NC 27592
Phone:
Signati
Date: /',JZ d
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.
cbmo Y)
A
County of
a Notary Public for the State of
PI S?ah

do hereby certify that
personally appeared before me this
day ofand acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
,,???grrrrrrrr?ri
sP P. 8L,qc
• ..........
ce /,`C" ,• • •./? ,ji
h`V GOI- RY . 2
sr -
lC
SEAL
My commission expires g
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 3
C,, I __. vl ??OFWATFq?G
?) 1
y ?
Ad*
A ti
WDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely filled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)l
I. PROJECT INFORMATION
Project name GREYSTONE CROSSING PHASE 3
Contact name ANDREW HODGE
Phone number
Date
Drainage area number
934-3490
October 16, 2008
11. 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 grassed bioretention cell?
To a mulched bioretention cell?
To a wetland?
To a filter strip or riparian buffer?
Other (specify)
Finer Strip or Riparian Buffer Characterization (if applicable)
Width of grass
Width of dense ground cover
Width of wooded vegetation
Total width
Elevation at downslope base of level lip
Elevation at top of bank of the receiving water
Slope (from level lip to to top of bank)
Are any draws present?
Level Spreader Design
Forebay surface area
Feet of level lip needed per cfs
Answer "Y" to one of the following:
Length based on the 1 in/hr storm?
Length based on the 10-yr storm?
Length based on the BMP discharge rate?
Design flow
Is a bypass device provided?
157,034.00 ft'
23,555.00 ft
15.00 %
0.31
1.12 cis
10.00 min
6.21 in/hr
6.94 cfs
N (Y or N)
N (Y or N)
N (Y or N)
Y (Y or N)
ft
62.00 ft
62.00 ft
239.73 fmsl
238.54 fmsl
Please complete filter strip characterization below.
1.92 % OK
N (Y or N) OK
47.00 sq ft OK
65 ft/cfs
Y (Y or N)
N (Y or N)
N (Y or N)
1.12 cfs
Y (Y or N) OK
Form SW401-Level Spreader, Finer Strip, Restored Riparian Buffer-Rev.5 Parts I. and It. Design Summary, page 1 of 2
Length of the level lip
Are level spreaders in series?
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 storm
Channel lining material

------------
M
73.00 ft Level spreader length OK.
N (Y or N)
N (Y or N)
Y (Y or N)
3.00 ft
3.00 ft
7.07 ft
0.68 ft
13.88 cfs
RIPRAP

M

Form SW401-Level Spreader, Fifter Strip, Restored Riparian Buffer-Rev.5 Parts I, and It. Design Summary, page 2 of 2
L' L5 r, 3
III. REQUIRED ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
Ir/ St?lget No.
o?Z
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 (ROM, and
- Boundaries of drainage easement.

004, V

/W A?"J
2. Plan details (1" = 30' or larger) for the level spreader showing:
- Forebay (if applicable),
- High flow bypass system,
- One foot topo lines between the level lip and top of stream bank,
- Proposed drainage easement, and
- Design at ultimate build-out.
3. Section view of the level spreader 0" = 20' or larger) showing:
- Underdrain system (if applicable),
- Level lip,
- Upslope channel, and
- Downslope filter fabric.
4. A date-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
4 t 3 5. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
Af.,I-J 6. The supporting calculations.
A(.1 (rJ 7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
/t?? 8. A copy of the deed restrictions (if required).
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Part III, page 1 of 1
6 C de / 2 *//e- •?P?i Z?" 3

td??7C?
_ f
z-, 2 ?s
7. 2 / 7r G. ?_ /, o c
LS c
P4c a,aazz4? = 9f!sF
Lev`(??-?c°•P?3 G--C c e:o? zc Y ScXa c?? ?(c,e
c ?IC
I
MFOFS.
35502
Cj? en

3 bps. l
5502
. G
xea
Gsc • i .
/'1 = z
z?
S
?? _ _ ?. 3 93 sC -
?C.I412 -[ 4's e l? ?lCY (C4 -s
? C4c
73
k t Al(e,00013 Z crvi
--
ll?dl 4 C
FF O-r

BPS
35502
I
35502
LEVEL SPREADER BYPASS CHANNEL -2&3
Worksheet for Trapezoidal Channel
Project Description
Project File c:\program files\haestad\fmw\greystn3.fm2
Worksheet LEVEL SPREADER BYPASS CHANNEL
Flow Element Trapezoidal Channel
Method Manning's Formula
Solve For Channel Depth
Input Data
Mannings Coefficient 0.032
Channel Slope 2.1000 %
Left Side Slope 3.000000 H : V
Right Side Slope 3.000000 H : V
Bottom Width 3.00 ft
Discharge 13.88 cfs
Results
Depth 0.68 ft
Flow Area 3.42 ft2
Wetted Perimeter 7.29 ft
Top Width 7.07 ft
Critical Depth 0.69 ft
Critical Slope 0.019725 fttft
Velocity 4.06 ftts
Velocity Head 0.26 ft
Specific Energy 0.93 ft
Froude Number 1.03
Flow is supercritical.
108 FlowMaster v5.17
111:42::42:03 AM Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 [phone] Page 1 of 1
Permit Number:
(to be provided by DWQ)
Drainage Area Number-- 1-5 -3
Filter Strip, Restored Riparian Buffer and Level Spreader
Operation and Maintenance Agreement
I will keep a maintenance record on this BMW. This maintenance record will be kept in a
log in a known set location. Any deficient BMW 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 any 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 3
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 wafter 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 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 3
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:GREYSTONE CROSSING PHASE 3
BMP drainage area number: L ;rte ®r,c ?•?
Print name:MIKE COATES
Title:O WNER
Address: 12400 NC 50 NORTH WILLOW SPRINGS NC 27592
Phone:
Signatl
Date: C tS /'2 71c'-'s
g/
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, PS QC''/?l?r64 a Notary Public for the
State of
7IC?/'?? ?v?ha , County of Q-?2AY76 do hereby certify that
mi c`'al e r' a? 1-e S personally appeared before me this
day of _ OCy? r , , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
???%,
?%01112?r
B L,
P/c
?v : •. O 0.
~ NOTARY
r i r
S C_
' PUBLIC U
011
ON COU?.?`e
SEAL
My commission expires y
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 3
Permit Number: C' LO - S J
(to be provided by DWQ)
Drainage Area Number: ?_OK 1?%
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 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:
The entire filter strip
The flow splitter device
(if applicable)
Potential problem:
Trash/debris is present.
The flow splitter device is
The flow splitter device is
damaged.
How I will remediate the problem:
Remove the trash/ debris.
Unclog the conveyance and dispose
of any sediment off-site.
Make any necessary repairs or
replace if damage is too large for
0 2)

Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 1 of 3
BMP element:
The swale and the level Potential roblem:
The swale is clo
ed with How I will remediate the roblem:
R

lip gg
sediment emove the sediment and dispose
. 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

end of the level spreader that
that is higher than the leve
p
shows stormwater has then plant a ground cover
7and
bypassed it. water until it is established
lime and a one-time fertilizer
a lication.
Trees or shrubs have begun Remove them.
to grow on the swale or just
downslo a of the level h .
e bypass channel Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then

Turf reinforcement is reestablish ro er erosion control.
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 filter strip
Grass is too short or too long the erosion control material.
Maintain grass at a height of
ti a licable . -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
f
lizer a lication
Nuisance vegetation is ove vegetation by hand if
choking out desirable species, rsible
. If pesticide is used, do not
it to get into the recei ving

The receiving water
Erosion or other signs of r.
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.' Page 2 of 3
Permit Number:
(to be provided by L)WQ)
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 D WQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:GREYSTONF (.Rncen.r(-_ DT-1 A C1r. ,
B11P drainage area number:_?ca u
Print name: MIKE
Title:O WNER
Address:12400 N
Phone:
Signatt
W
Date: "° - 7/45 o
Note: The legally responsible parry 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
??ry1 f hq County of ll ?11nST LLb ?? , do herebv certify that
e_1-s personally appeared before me this 0?4
day of 1(' O? and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal.
01*111111%?i
5P9 BLA C
• NOTARY •
pPUBLIC
• ^ 0•a
°,.o; /V CO o®
SEAL
My commission expires ??
c;
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer 0&M-Rev.3 Page 3 of 3
Permit Number. 1::? CC - I qS S (- ) 3
(to be provided by DWQ)
Drainage Area Number c 4-, /4 ('Q 411. -4Q,
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 roblem: 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 an
d dispose
(if applicable) clogged. of any 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 3
BMW element: Potential problem: How I will remediate the roblem:
The Swale and the level
lip The swale is clogged with Remove the sediment and dispose
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 of the level li .
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 filter strip
Grass is too short or too long the erosion control material.
Maintain grass at a height of
if applicable). a roxun Oei 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 a lication.
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 a 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

The receiving water
Erosion or other signs of water.
Contact the NC Division of Water
damage have occurred at the Quality local Regional Office, or the
outlet 401 Oversi t Unit at 919-733-1786.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 2 of 3
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:GREYSTONE CROSSING PHASE 3
BMP drainage area number: ..5e a L-O- tc /elm r c ?-2 a /ate Lu
Print name:MIKE COATES
Title:OWNER
Address: 12400 NC 50 NORTH WILLOW SPRINGS NC 27592
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.
4P,51-) e?C/(*-?
/? ? )- , a Notary Public for the State of
/9tY1,A (VW11_-'1&k , County of rS?n , do hereby certify that
'm7Cheae- / r4DCW7 e S personally appeared before me this 0?q4 k 1-
day of ___0Lkbe1_ , ?, and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
BLA
NOTARY '•
-fir-
o •
C_%: PUBLIC
SON CO\? %'o-
°eae®PSmno?
SEAL
My commission expires. S " p? 5-- Ol 0l 0
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 3
Date: -cs l z -r 't
Permit Number:
(to be provided by DWQ)
Drainage Area Number: 5,4 - S c .-K ,1_`
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 ansediment off-site.
The flow sputter 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 3
BMP element: Potential problem: How I will remediate the roblem:
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
downslope of the level lip.
e 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 time 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 time 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 3
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
BMP drainage area number:
GCf
Print name:MIKE COATES
Title:0 WNER
Address: 12400 NC 50 NORTH WILLOW SPRINGS NC 27592
Pl
Si
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
1 7 a Notary Public for the State of
County of C )-)?hSAY) , do hereby certify that
j?? e//l oQ 7?es personally appeared before me this C))rl v
day of t'p Y' Dote and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
BLAC
NOTARY 2
r
s +
pPUBLIC r U
SEAL
My commission expires 2 s ? 0/'V
Form SWU40I-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 3
Date: v?dC 7zrS qr-